1. Features and TypesCross-Roller RingFeatures of the Cross-Roller Ring Inner ring Outer ringRollerSpacer retainerFig.1 Structure of Cross Roller-Ring Model RBStructure and Features With the Cross-Roller Ring, cylindrical rollers are arranged with each roller perpendicular to the adjacent roller, in a 90 V groove, separated from each other by a spacer retainer. This design allows just one bearing to receive loads in all directions including radial, axial and moment loads. Since the Cross-Roller Ring achieves high rigidity despite the minimum possible dimensions of the inner and outer rings, it is optimal for applications such as joints and swiveling units of industrial robots, swiveling tables of machining centers, rotary units of manipulators, precision rotary tables, medical equipment, measuring instruments and IC manufacturing machines. [High Rotation Accuracy] The spacer retainer tting among cross-arrayed rollers prevents rollers from skewing and the rotational torque from increasing due to friction between rollers. Unlike conventional types using steel sheet retainers, the Cross-Roller Ring does not cause unilateral contact of roller or seize. Thus, even under a preload, the Cross-Roller Ring provides stable rotation. Since the inner and outer rings are designed to be separable, the bearing clearance can be adjusted. In addition, a preload can be applied. These features enable accurate rotation.A18-2

2. Features and Types Features of the Cross-Roller Ring[Easy Handling] The inner and outer rings, which are separable, are secured to the Cross-Roller Ring body after being installed with rollers and spacer retainers in order to prevent the rings from separating from each other. Thus, it is easy to handle the rings when installing the Cross-Roller Ring. [Skewing Prevention] The spacer retainer keeps rollers in their proper position, thereby preventing them from skewing (tilted rollers). This eliminates friction between rollers, and therefore secures a stable rotational torque.RollerSpacer retainer[Increased Rigidity (Three to Four Times Greater than the Conventional Type)] Unlike the thin angular ball bearings installed in double rows, the cross array of rollers allows a single Cross-Roller Ring unit to receive loads in all directions, increasing the rigidity to three to four times greater than the conventional type. Moment Rigidity DiagramM (moment)10-4 1015.876 ing9ear r ba 50.8ang ow64e-rAngular Ball BearingublM (moment)Do5M (moment)3 2RA0 50RB1 501388 31 0Cross-Roller Ringula7 Gradient angle: rad7.938ll b815 8 50 509.8 19.6 29.4 39.2 N m Moment: MModel RA5008Model RB5013Cross Roller RingA18-3 3. [Large Load Capacity] (1) Compared with conventional steel sheet retainers, the spacer retainer allows a longer effective contact length of each roller, thus signi cantly increasing the load capacity. The spacer retainer guides rollers by supporting them over the entire length of each roller, whereas the conventional type of retainer supports them only at a point at the center of each roller. Such one-point contact cannot suf ciently prevent skewing. Roller contact length11With a spacer retainer 1 222With a steel sheet retainer (conventional type)(2) In conventional types, the loaded areas are asymmetrical between the outer ring and the inner ring sides around the roller longitudinal axis. The greater the applied load is, the greater the moment becomes, leading end-face contact to occur. This causes frictional resistance, which hinders smooth rotation and quickens wear. End-face contactLoaded areas symmetrical With a spacer retainerA18-4Loaded areas asymmetrical With a steel sheet retainer (conventional type) 4. Features and Types Types of the Cross-Roller RingTypes of the Cross-Roller Ring Types and FeaturesModel RU (Integrated Inner/Outer Ring Type)Speci cation TableA18-20Since holes are drilled for mounting, the need for a presser ange and a housing is eliminated. Also, owing to the integrated inner/outer ring type stryucture with washer, there is almost no effect from installation on performance, allowing stable rotational accuracy and torque to be obtained. Can be used for both outer and inner ring rotation.Model RUModel RB (Separable Outer Ring Type for Inner Ring Rotation)Speci cation TableA18-22Cross-Roller RingCross-Roller Ring basic type, with a separable outer ring, and an inner ring integrated with the main body.It is used in locations where the rotational accuracy of the inner ring is required. It is used, for example, in the swivel portions of index tables of machine tools.Model RBModel RE (Two-piece Inner Ring Type for Outer Ring Rotation)Speci cation TableA18-25Main dimensions are the same as model RB. This model is used in locations where the rotational accuracy of the outer ring is required.Model REA18-5 5. USP-Grade Series of Models RB and RESpeci cation TableA18-28The rotation accuracy of the USP-Grade Series achieves the ultra precision grade that surpasses the worlds highest accuracy standards such as JIS Class 2, ISO Class 2, DIN P2 and AFBMA ABCE9.Model RA (Separable Outer Ring Type for Inner Ring Rotation)Speci cation TableA18-29A compact type similar to model RB with the thinnest possible inner and outer rings. Optimal for locations requiring a light-weight and compact design such as the swivel portions of robots and manipulators.Model RAModel RA-C (Singe-Split Type)Speci cation TableA18-30The main dimensions are the same as that of model RA.Owing to its Single-split Outer Ring structure with a highly rigid outer ring, this model can be used for outer ring rotation.Model RA-CA18-6 6. Point of SelectionCross-Roller RingSelecting a Cross-Roller Ring Selecting a bearing sizeRigidityClearance Rigidity of the mounting sectionAccuracyAccuracy gradeLubrication MethodsPredicting the Service LifeRotational TorqueSelecting a TypeDetermining the ConditionsThe following diagram shows a typical procedure for selecting a Cross-Roller Ring.Inner ring rotatingModel RB Outer ring rotatingModel RE Mounting spaceModels RA-C and RACross-Roller RingA18-7 7. Nominal Life fT C fW PCL LC PC fT fW10 3106: Nominal life (The total number of revolutions that 90% of a group of identical CrossRoller Ring units independently operating under the same conditions can achieve without showing aking from rolling fatigue) (N) : Basic dynamic load rating : Dynamic equivalent radial load (N) (see A18-9) : Temperature factor (see Fig.1) : Load factor (see Table1) The basic dynamic load rating (C) of the Cross-Roller Ring shows the radial load with interlocked direction and magnitude, under which the nominal life (L) is 1 million revolutions when a group of identical Cross-Roller Ring units independently operate under the same conditions. The basic dynamic load rating (C) is indicated in the speci cation tables.Temperature factor fT[Nominal Life] The service life of the Cross-Roller Ring is obtained from the following equation. 1.0 0.9 0.8 0.7 0.6 0.5 100150200250Temperature of the bearing unit () Fig.1 Temperature Factor (fT) Note) The normal service temperature is 80 or below. If the product is to be used at a higher temperature, contact THK.Table1 Load Factor (fW)Service condition Smooth motion without impact Normal motionfW 1 to 1.2 1.2 to 1.5Motion with severe impact1.5 to 3[Calculating the Service Life Time]For Rotary MotionLLh Lh nrnr60: Service life time : Rotation speed per minute(h) (min-1)For Oscillatory Motion360 L 2 n 60 Lh Lhno: Service life time (h) : Rocking angle (deg.) (see gure at right) : Number of reciprocations per minute (min-1) Rocking angle: If is too small, this will hinder the formation of an oil film on the contact surfaces between the race and the roller and may cause fretting. If the product will be used in these conditions, contact THK.A18-8 8. Point of Selection Nominal Life[Dynamic Equivalent Radial Load PC] The dynamic equivalent radial load of the Cross-Roller Ring is obtained from the following equation.2M dpPCXPC Fr Fa M X Y dp: Dynamic equivalent radial load (N) : Radial load (N) : Axial load (N) : Moment (N-mm) : Dynamic radial factor (see Table2) : Dynamic axial factor (see Table2) : Roller pitch circle diameter (mm)FrYFaMoment (M)Axial load (Fa)Radial load (Fr)Moment (M) Fig.2 Table2 Dynamic Radial Factor and Dynamic Axial FactorClassi cationXYFa 1.5 Fr + 2M/dp10.45Fa 1.5 Fr + 2M/dp0.670.67If Fr = 0N and M = 0 N-mm, perform calculation while assuming that X = 0.67 and Y = 0.67. For service life calculation with a preload taken into account, contact THK.Cross-Roller RingA18-9 9. Static Safety Factor The basic static load rating C0 refers to the static load with constant direction and magnitude, under which the calculated contact stress in the center of the contact area between the roller and the raceway under the maximum load is 4000 MPa. (If the contact stress exceeds this level, it will affect the rotation.) This value is indicated as C0 in the speci cation tables. When a load is statically or dynamically applied, it is necessary to consider the static safety factor as shown below.C0 P0fSTable3 Static Safety Factor (fS)Load conditionsfS C0 P0: Static safety factor (see Table3) : Basic static load rating (N) : Static equivalent radial load (N)Lower limit of fSNormal load1 to 2Impact load2 to 3[Static Equivalent Radial Load P0] The static equivalent radial load of the Cross-Roller Ring is obtained from the following equation.P0 P0 Fr Fa M X0 Y0 dpX0 Fr2M dpY0Fa: Static equivalent radial load (N) : Radial load (N) : Axial load (N) : Moment (N-mm) : Static radial factor (X0=1) : Static axial factor (Y0=0.44) : Roller pitch circle diameter (mm)Moment (M)Axial load (Fa)Radial load (Fr)Moment (M) Fig.3A18-10 10. Point of Selection Static Permissible MomentStatic Permissible Moment The static permissible moment (M0) of the Cross-Roller Ring is obtained from the following equation.dp 2103M0C0M0 C0 dp: Static Permissible Moment : Basic static load rating : Roller pitch circle diameter(kN-m) (kN) (mm)Static Permissible Axial Load The static permissible axial load (Fao) of the Cross-Roller Ring is obtained from the following equation.Fa0 Fa0 Y0C0 Y0 : Static permissible axial load (kN) : Static axial factor (Y0=0.44)Cross-Roller RingA18-11 11. Accuracy Standards The Cross-Roller Ring is manufactured with the accuracy and the dimensional tolerance according to Table4 to Table13. Table4 Rotational Accuracy of the Inner Ring of Model RUModel No. RU42Radial runout tolerance of the inner ringUnit: mAxial runout tolerance of the inner ringGrade P5Grade P4Grade P2Grade P5Grade P4Grade P2432.5432.5RU66542.5542.5RU85542.5542.5RU124542.5542.5RU148652.5652.5RU178652.5652.5RU228865865RU29710851085RU4451512715127Note) For model RU, grade P5 is standard rotational accuracy.(Not indicated in model number.)Table5 Rotational Accuracy of the Outer Ring of Model RUModel No.Radial runout tolerance of the outer ring Grade P5Grade P4Grade P2Unit: mAxial runout tolerance of the outer ring Grade P5Grade P4Grade P2RU42854854RU6610651065RU8510651065RU12413851385RU1481510715107RU1781510715107RU2281811718117RU2972013820138RU445251610251610Note) For model RU, grade P5 is standard rotational accuracy.(Not indicated in model number.)A18-12 12. Point of Selection Accuracy Standards Table6 Rotational Accuracy of the Inner Ring of Model RBNominal dimension of the bearing inner diameter (d) (mm) AboveOr less18 30 50 80 120 150 180 250 315 400 500 630 800 100030 50 80 120 150 180 250 315 400 500 630 800 1000 1250Radial runout tolerance of the inner ring Grade Grade Grade Grade PE6 PE5 PE4 PE2 Grade 0 Grade Grade Grade Grade P6 P5 P4 P2 13 8 4 3 2.5 15 10 5 4 2.5 20 10 5 4 2.5 25 13 6 5 2.5 30 18 8 6 2.5 30 18 8 6 5 40 20 10 8 5 50 25 13 10 60 30 15 12 65 35 18 14 70 40 20 16 80 90 100 Table7 Rotational Accuracy of the Outer Ring of Model RENominal dimension of the bearing outer diameter (D) (mm) Or less30 50 80 120 150 180 250 315 400 500 630 800 1000 125050 80 120 150 180 250 315 400 500 630 800 1000 1250 1600Table8 Rotational Accuracy of the Inner Ring of Model RA and RA-C Unit: mUnit: mAxial runout tolerance of the outer ring Grade Grade Grade Grade PE6 PE5 PE4 PE2 Grade 0 Grade Grade Grade Grade P6 P5 P4 P2 20 10 7 5 2.5 25 13 8 5 4 6 5 35 18 10 40 20 11 7 5 45 23 13 8 5 50 25 15 10 7 60 30 18 11 7 70 35 20 13 8 80 40 23 15 100 50 25 16 120 60 30 20 120 75 120 120 Table9 Rotational Accuracy of the Outer Ring of Model RA-C Unit: mNominal dimension of the bearing Tolerance in inner diameter (d) (mm) radial runout and axial runout Above Or less 40 65 13 65 80 15 80 100 15 100 120 20 120 140 25 140 180 25 180 200 30Nominal dimension of the bearing Tolerance in outer diameter (D) (mm) radial runout and axial runout Above Or less 65 80 13 80 100 15 100 120 15 120 140 20 140 180 25 180 200 25 200 250 30Note) If higher accuracy than the above values is required for the inner ring in rotational accuracy for models RA and RA-C, contact THK.Note) The rotational accuracy of the outer ring for model RA-C indicates the value before separation.A18-13Cross-Roller RingAboveRadial runout tolerance of the outer ring Grade Grade Grade Grade PE6 PE5 PE4 PE2 Grade 0 Grade Grade Grade Grade P6 P5 P4 P2 20 10 7 5 2.5 25 13 8 5 4 35 18 10 6 5 40 20 11 7 5 45 23 13 8 5 50 25 15 10 7 60 30 18 11 7 70 35 20 13 8 80 40 23 15 100 50 25 16 120 60 30 20 120 75 120 120 Unit: mAxial runout tolerance of the inner ring Grade Grade Grade Grade PE6 PE5 PE4 PE2 Grade 0 Grade Grade Grade Grade P6 P5 P4 P2 13 8 4 3 2.5 15 10 5 4 2.5 4 2.5 20 10 5 25 13 6 5 2.5 30 18 8 6 2.5 30 18 8 6 5 40 20 10 8 5 50 25 13 10 60 30 15 12 65 35 18 14 70 40 20 16 80 90 100 13. Table10 Dimensional Tolerance of the Bearing Inner DiameterUnit: m(note 2)Tolerance of dm Nominal dimension of the bearing inner Grades 0, P6, P5, P4, Grade PE6 Grade PE5 diameter (d) (mm) P2 and USP Above Or less Upper Lower Upper Lower Upper LowerGrade PE4 and PE2 UpperLower18300100806053050012010080650800150120907801200200150100812015002501801301015018002501801301018025003002201501225031503502501831540004003002340050004503550063005004063080007580010000100100012500125Note1) Standard inner diameter accuracy of models RA, RA-C and RU is 0. For higher accuracy than 0, contact THK. Note2) dm represents the arithmetic average of the maximum and minimum diameters obtained in measuring the bearing inner diameter at two points. Note3) For accuracy grades in bearing inner diameter with no values indicated in the table, the highest value among low accuracy grades applies. Table11 Dimensional Tolerance of the Bearing Outer DiameterUnit: m(note 2)Tolerance of Dm Nominal dimension of the bearing outer Grades 0, P6, P5, P4, Grade PE6 Grade PE5 diameter (D) (mm) P2 and USP Above Or less Upper Lower Upper Lower Upper LowerGrade PE4 and PE2 UpperLower30500110907065080013011090780120015013010081201500180150110915018002501801301018025003002001501125031503502501801331540004002802001540050004503302350063005003802863080007504503580010000100100012500125125016000160Note1) Standard outer diameter accuracy of models RA, RA-C and RU is 0. For higher accuracy than 0, contact THK. Note2) Dm represents the arithmetic average of the maximum and minimum diameters obtained in measuring the bearing outer diameter at two points. Note3) For accuracy grades in bearing outer diameter with no values indicated in the table, the highest value among low accuracy grades applies.A18-14 14. Point of Selection Accuracy Standards Table12 Tolerance in the Width of the Inner and Outer Rings for Models RU Unit: mModel No.Tolerance of B UpperLowerRU42075RU66075RU85075RU124075RU148075RU1780100RU2280100RU2970100RU4450150Table13 Tolerance in the Width of the Inner and Outer Rings (Common to All Grades) for Models RB and RE Unit: mNominal dimension of the bearing inner diameter (d) (mm) AboveOr lessTolerance of BTolerance of B1Applied to the inner ring of RB and the outer ring of REApplied to the outer ring of RB and the inner ring of REUpperLowerUpperLower3007501005007501005080075010080120075010012015001000120150180010001201802500100012025031501200150315400015002004005000150020050063001500200630800015002008001000030004001000125003000400Note) All B and B1 types of models RA and RA-C are manufactured with tolerance between -0.120 and 0.A18-15Cross-Roller Ring18 30 15. Accuracy Standard of the USP-Grade Series [Examples of Rotational Accuracy of the USP-Grade Series Cross-Roller Rings] The rotation accuracy of the USP-Grade Series achieves the ultra precision grade that surpasses the worlds highest accuracy standards such as JIS Class 2, ISO Class 2, DIN P2 and AFBMA ABEC9. Radial runoutAxial runout2 m2.5 m(standard: 5 m MAX.)(standard: 5 m MAX.)40 500 600 Rotational Accuracy of the Inner Ring of Model RB50040CC0USPAxial runout 3m (standard: 7 m MAX.)40 Radial runout 2.5 m 500 600(standard: 7m MAX.)Rotational Accuracy of the Outer Ring of Model RE50040CC0USP[Accuracy Standards] The USP-grade series of models RU, RB and RE are manufactured with runout accuracies according to Table14,Table15. Table14 Runout Accuracies of the USP-grade Series of Models RU Unit: mModel No.RU 42 RU 66 RU 85 RU124 RU148 RU178 RU228 RU297 RU445A18-16Runout accuracy of the inner ring of model RU Radial Axial runout runout tolerance tolerance 2 2 2 2 2 2 2 2 2 2 2 2 2.5 2.5 3 3 4 4Runout accuracy of the outer ring of model RU Radial Axial runout runout tolerance tolerance 3 3 3 3 3 3 3 3 4 4 4 4 4 4 5 5 7 7Table15 Runout Accuracies of the USP-grade Series of Models RB and RE Unit: mNominal inner diameter (d) Runout accuracy and outer diameter (D) of the inner ring (mm) of model RB Radial Axial Above Or less runout runout tolerance tolerance 80 180 2.5 2.5Runout accuracy of the outer ring of model RE Radial Axial runout runout tolerance tolerance 3 31802503344250315444431540044554005005555500630667763080088 16. Point of Selection Radial ClearanceRadial Clearance Table16 shows the radial clearance of model RU, Table17 that of the standard type of models RB and RE, Table18 that of the USP-grade series of models RB and RE, and Table19 that of the thin type of models RA and RA-C. Table16 Radial clearance for model RU Unit: mCC0C0Model No. Starting torque (Nm) Radial clearance ( m) Min. Max. Min. Max. 0.1 0.5 0 25 RU42 0.3 2.2 0 30 RU66 0.4 3 0 40 RU85 1 6 0 40 RU124 1 10 0 40 RU148 3 15 0 50 RU178 5 20 0 60 RU228 10 35 0 70 RU297 20 55 0 100 RU445 Note) Model RU clearance CC0 is controlled by starting torque.Starting torque for clearance CC0 does not include seal resistance value. Table17 Radial Clearances of Models RB and RE Unit: mPitch circle diameter of the roller (dp) (mm) Or less 30 50 80 120 140 160 180 200 225 250 280 315 355 400 450 500 560 630 710 800 900 1000 1120 1250 1400C0Min. Max. Min. 8 0 0 8 0 0 10 0 0 10 0 0 10 0 0 10 0 0 10 0 0 10 0 0 10 0 0 10 0 0 15 0 0 15 0 30 15 0 30 15 0 30 20 0 30 20 0 30 20 0 30 20 0 40 20 0 40 30 0 40 30 0 40 30 0 50 30 0 60 30 0 60 30 0 70Max. 15 25 30 40 40 40 50 50 60 60 80 100 110 120 130 130 150 170 190 210 230 260 290 320 350C1 Min. 15 25 30 40 40 40 50 50 60 60 80 100 110 120 130 130 150 170 190 210 230 260 290 320 350Max. 35 50 60 70 80 90 100 110 120 130 150 170 190 210 230 250 280 310 350 390 430 480 530 580 630Pitch circle diameter of the roller (dp) (mm) Above Or less 160 120 200 160 250 200 280 250 315 280 355 315 400 355 500 400 560 500 630 560 710 630CC0 Min. 10 10 10 15 15 15 15 20 20 20 20C0Max. 0 0 0 0 0 0 0 0 0 0 0Min. 0 0 0 0 0 0 0 0 0 0 0Max. 40 50 60 80 100 110 120 130 150 170 190Table19 Radial Clearances of Models RA and RA-C Unit: mPitch circle diameter of the roller (dp) (mm) Above 50 80 120 140 160 180 200Or less 80 120 140 160 180 200 225CC0 Min. 8 8 8 8 10 10 10Max. 0 0 0 0 0 0 0C0 Min. 0 0 0 0 0 0 0Max. 15 15 15 15 20 20 20A18-17Cross-Roller RingAbove 18 30 50 80 120 140 160 180 200 225 250 280 315 355 400 450 500 560 630 710 800 900 1000 1120 1250CC0Table18 Radial Clearances of USP-grade Series of Models RB and RE Unit: m 17. Moment Rigidity Fig.4 to Fig.7 show moment rigidity diagrams for the Cross-Roller Ring as a separate unit. Rigidity is affected by the deformation of the housing, presser ange and bolts. Therefore, the strength of these parts must be taken into account. (Radial clearance: 0)Gradient angle: radRA08 RA605008104 3 7 RA008RA8008RA90082 RA100081008 RA1 008 RA12 08 RA130 0 8 RA140 RA1500810RA19013 RA20013 RA16013 RA17013 RA18013 0.1 0.15 0.2 (kNm) Moment: M0.05Fig.4Gradient angle: rad13 7013RRB60 RBRB5013104 30 B8169 RB016RB2100200 102 RB1 2016 RB1 025 RB12 25 RB130 25 RB1401RB150200.10.2 Moment: M Fig.5A18-180.350.4 (kNm) 18. Point of Selection Moment RigidityGradient angle: rad52003502RBRB18 RBRB16025104 322 405 R5 B20400 004 RB3 0 502 RB32RB4010405 RB5002 RB50040 RB60040 02468Fig.6104 1.5 58 RB7Gradient angle: radRB70004 0000071RB900011RB100.5110RB125002040 Moment: M6080100 (kNm)Fig.7A18-19Cross-Roller Ring10 (kNm)Moment: M 19. Model RU (Integrated Inner/Outer Ring Type) d2-greasing holer rDRU 124G to RU 445GRU 42 to RU 85 d2-greasing holer r DRU 124X to RU 445XRU 124 to RU 445Shaft diameter20 35 55 80 90 115 160 210 350Model No.RU 42 RU 66 RU 85 RU 124 (G) RU 124X RU 148 (G) RU 148X RU 178 (G) RU 178X RU 228 (G) RU 228X RU 297 (G) RU 297X RU 445 (G) RU 445XInner Outer diameter diameterBasic load rating (radial)Shoulder heightMain dimensions Roller pitch Greasing Width circle hole diameter dp B d1 41.5 12 3.1 66 15 3.1 85 15 3.1CMassC0rmin 0.6 0.6 0.6ds 37 59 79Dh 47 74 93kN 7.35 17.5 20.3kN 8.35 22.3 29.5kg 0.29 0.62 13.1111413433.150.92.6253.11.513316249.176.84.9178283.11.516119580.31356.8295227.5356220824610417311.4210380297.34062.527232015628121.3350540445.44562.541747322247335.4d 20 35 55D 70 95 120801651242290210147.5115240160Note) Optional grease nipple available for model RU. (See gure below) Please indicate with a -N at the end of the model number if required.9115.561.52 7.5666 8 3.1NP3.23.5A18-20NP65To download a desired data, search for the corresponding model number in the Technical site.https://tech.thk.com 20. PCD2 dsModel RUModel RUUUPCD1Model RUUModel RUUT Dh Unit: mmMounting Hole Related Inner ring PCD1 28 45 65 97139 184 240 385Mounting hole 6-M3 through 8-M4 through 8-M5 through 10- 5.5 drilled through, 9.5 counter bore depth 5.4 10-M5 through 12- 9 drilled through, 14 counter bore depth 8.6 12-M8 through 12- 9 drilled through, 14 counter bore depth 8.6 12-M8 through 12- 11 drilled through, 17.5 counter bore depth 10.8 12-M10 through 16- 14 drilled through, 20 counter bore depth 13 16-M12 through 24- 14 drilled through, 20 counter bore depth 13 24-M12 throughPCD2 57 83 105 148 187Mounting hole 6- 3.4 drilled through, 6.5 counter bore depth 3.3 8- 4.5 drilled through, 8 counter bore depth 4.4 8- 5.5 drilled through, 9.5 counter bore depth 5.4 10- 5.5 drilled through, 9.5 counter bore depth 5.4 12- 9 drilled through, 14 counter bore depth 8.621712- 9 drilled through, 14 counter bore depth 8.627012- 11 drilled through, 17.5 counter bore depth 10.835016- 14 drilled through, 20 counter bore depth 1350524- 14 drilled through, 20 counter bore depth 13Model number codingRU124 UU CC0 P2 B G X -N Model No.Seal symbolAccuracy symbol (*2) Radial clearance symbol (*1) Sub-part Accuracy symbolNo Symbol : No Symbol : Without seal UU : Seal attached on both ends R: U : Seal attached on either end (counterbore side of the outer ring) B: UT : Seal attached on either end (opposite to the counterbore side of the outer ring)Rotational Accuracy of the Inner Ring Rotational Accuracy of the Outer Ring Rotational Accuracy of the Inner/Outer RingsOption symbol No Symbol : No accessory -N : Grease nipple attached (For the nipple's shape, see the figure on the left.) RU42 to RU178: NP3.23.5 RU228 to RU445: NP65Inner Ring Hole symbol [Available models: RU124 to RU445] No Symbol : Inner ring counterbore hole X : Inner ring tapped hole (through hole)Mounting Hole Orientation symbol [Available models: RU124 to RU445 (excluding X type)]No Symbol : The counterbore holes of the inner and outer rings face the same direction G : The counterbore holes of the inner and outer rings face opposite direction(*1) See A18-17. (*2) See A18-12.A18-21Cross-Roller Ring112Outer ring 21. Model RB (Separable Outer Ring Type) d4-greasing holer B rB1 Model RBD dsb Model RBUUa DhDetail view of the greasing hole Unit: mmShaft diameter20 25 30 35 40 45 50 60 70 80 90 100 110 120 130Model No.RB 2008 RB 2508 RB 3010 RB 3510 RB 4010 RB 4510 RB 5013 RB 6013 RB 7013 RB 8016 RB 9016 RB 10016 RB 10020 RB 11012 RB 11015 RB 11020 RB 12016 RB 12025 RB 13015 RB 13025Inner Outer diameter diameter d 20 25 30 35 40 45 50 60 70 80 90 100 110 120 130D 36 41 55 60 65 70 80 90 100 120 130 140 150 135 145 160 150 180 160 190Roller pitch circle Width Greasing hole diameter dp B B1 a b 27 8 2 0.8 32 8 2 0.8 41.5 10 2.5 1 46.5 10 2.5 1 51.5 10 2.5 1 56.5 10 2.5 1 64 13 2.5 1.6 74 13 2.5 1.6 84 13 2.5 1.6 98 16 3 1.6 108 16 3 1.6 119.3 16 3.5 1.6 123 20 3.5 1.6 121.8 12 2.5 1 126.5 15 3.5 1.6 133 20 3.5 1.6 134.2 16 3.5 1.6 148.7 25 3.5 2 144.5 15 3.5 1.6 158 25 3.5 2Basic load rating Mass (radial)Shoulder heightMain dimensionsC rmin 0.5 0.5 0.6 0.6 0.6 0.6 0.6 0.6 0.6 0.6 1 1 1 0.6 0.6 1 0.6 1.5 0.6 1.5ds 23.5 28.5 37 41 47.5 51 57.4 68 78 91 98 109 113 117 122 120 127 133 137 143Dh 30.5 35.5 47 51.5 57.5 61.5 72 82 92 111 118 129 133 127 136 143 141 164 152 174C0kN 3.23 3.63 7.35 7.64 8.33 8.62 16.7 18 19.4 30.1 31.4 31.7 33.1 12.5 23.7 34 24.2 66.9 25 69.5kN 3.1 3.83 8.36 9.12 10.6 11.3 20.9 24.3 27.7 42.1 45.3 48.6 50.9 24.1 41.5 54 43.2 100 46.7 107kg 0.04 0.05 0.12 0.13 0.16 0.17 0.27 0.3 0.35 0.7 0.75 0.83 1.45 0.4 0.75 1.56 0.72 2.62 0.72 2.82Note) The model number of a type with seals attached is RBUU. If a certain level of accuracy is required, this model is used for inner ring rotation.A18-22To download a desired data, search for the corresponding model number in the Technical site.https://tech.thk.com 22. d4-greasing holer B rB1DModel RB dsb a DhModel RBUUDetail view of the greasing holeUnit: mmShoulder heightMain dimensions Shaft diameterModel No.Inner Outer diameter diameter d140 150200 220 240 250300 350140 150 160 170 180 190 200 220 240 250300 350D 175 200 180 210 230 220 220 240 240 260 280 295 280 300 310 330 355 360 395 405 400C rmin 1 1.5 0.6 1.5 1.5 1.5 1.5 1.5 1 2 2 2 2 2.5 2.5 2.5 2.5 2.5 2.5 2.5 2.5ds 147 154 157 164 173 173 184 195 202 215 221 225 235 256 265 269 275 315 322 326 363Dh 162 185 172 194 211 204 198 225 222 245 258 270 265 281 290 306 326 340 368 377 383C0kN 25.9 74.8 27 76.8 100 81.7 29 84 41.7 84.2 114 151 92.3 68.3 69.3 126 195 76.3 183 212 54.1kN 50.1 121 53.5 128 156 135 62.1 143 82.9 157 200 252 171 145 150 244 348 178 367 409 143kg 1 2.96 0.68 3.16 5.3 3.14 2.21 3.44 2.99 4 6.7 9.6 4.1 4.5 5 8.1 14.8 5.9 13.4 17.2 3.9Note) The model number of a type with seals attached is RBUU. If a certain level of accuracy is required, this model is used for inner ring rotation. Model number codingRB3010 UU CC0 P5 Model numberAccuracy symbol (*2) Radial clearance symbol (*1)Seal attached on both ends (seal attached on either end: U) (*1) See A18-17. (*2) See A18-13.A18-23Cross-Roller Ring160 170 180 190RB 14016 RB 14025 RB 15013 RB 15025 RB 15030 RB 16025 RB 17020 RB 18025 RB 19025 RB 20025 RB 20030 RB 20035 RB 22025 RB 24025 RB 25025 RB 25030 RB 25040 RB 30025 RB 30035 RB 30040 RB 35020Roller pitch circle Width Greasing hole diameter a b dp B B1 154.8 16 2.5 1.6 168 25 3.5 2 164 13 2.5 1.6 178 25 3.5 2 188 30 4.5 3 188.6 25 3.5 2 191 20 3.5 1.6 210 25 3.5 2 211.9 25 3.5 1.6 230 25 3.5 2 240 30 4.5 3 247.7 35 5 3 250.1 25 3.5 2 269 25 3.5 2 277.5 25 3.5 2 287.5 30 4.5 3 300.7 40 6 3.5 328 25 3.5 2 345 35 5 3 351.6 40 6 3.5 373.4 20 3.5 1.6Basic load rating Mass (radial) 23. Model RB (Separable Outer Ring Type) d4-greasing holer B rB1DModel RB dsb a DhModel RBUUDetail view of the greasing holeUnit: mmShaft diameterModel No.Inner Outer diameter diameter d400 450 500 600 700 800 900 1000 1250RB 40035 RB 40040 RB 45025 RB 50025 RB 50040 RB 50050 RB 60040 RB 70045 RB 80070 RB 90070 RB 1000110 RB 1250110400 450 500 600 700 800 900 1000 1250D 480 510 500 550 600 625 700 815 950 1050 1250 1500Roller pitch circle Width diameter dp 440.3 453.4 474 524.2 548.8 561.6 650 753.5 868.1 969 1114 1365.8B B1 35 40 25 25 40 50 40 45 70 70 110 110Basic load rating Mass (radial)Shoulder heightMain dimensions Greasing hole a 5 6 3.5 3.5 6 6 6 6 6 6 6 6b 3 3.5 1.6 1.6 3 3.5 3 3 4 4 6 6C rmin 2.5 2.5 1 1 2.5 2.5 3 3 4 4 5 5ds 422 428 464 514 526 536 627 731 836 937 1057 1308Dh 459 479 484 534 572 587 673 777 900 1001 1171 1423C0kN 156 241 61.7 65.5 239 267 264 281 468 494 1220 1350kN 370 531 182 201 607 653 721 836 1330 1490 3220 3970kg 14.5 23.5 6.6 7.3 26 41.7 29 46 105 120 360 440Note) The model number of a type with seals attached is RBUU. If a certain level of accuracy is required, this model is used for inner ring rotation. Model number codingRB40040 UU C0 PE5 Model numberAccuracy symbol (*2) Radial clearance symbol (*1)Seal attached on both ends (seal attached on either end: U) (*1) See A18-17 . (*2) See A18-13.A18-24To download a desired data, search for the corresponding model number in the Technical site.https://tech.thk.com 24. Model RE (Two-piece Inner Ring Type) d4-greasing hole B1rB rDModel RE dsb a DhModel REUU Detail view of the greasing hole Unit: mmShoulder heightMain dimensions Shaft diameter100 110 120 130RE 2008 RE 2508 RE 3010 RE 3510 RE 4010 RE 4510 RE 5013 RE 6013 RE 7013 RE 8016 RE 9016 RE 10016 RE 10020 RE 11012 RE 11015 RE 11020 RE 12016 RE 12025 RE 13015 RE 13025Inner Outer diameter diameter d 20 25 30 35 40 45 50 60 70 80 90 100 110 120 130D 36 41 55 60 65 70 80 90 100 120 130 140 150 135 145 160 150 180 160 190Roller pitch circle Width Greasing hole diameter dp B B1 a b 29 8 2 0.8 34 8 2 0.8 43.5 10 2.5 1 48.5 10 2.5 1 53.5 10 2.5 1 58.5 10 2.5 1 66 13 2.5 1.6 76 13 2.5 1.6 86 13 2.5 1.6 101.4 16 3 1.6 112 16 3 1.6 121.1 16 3 1.6 127 20 3.5 1.6 123.3 12 2.5 1 129 15 3 1.6 137 20 3.5 1.6 136 16 3 1.6 152 25 3.5 2 146 15 3 1.6 162 25 3.5 2C rmin 0.5 0.5 0.6 0.6 0.6 0.6 0.6 0.6 0.6 0.6 1 1 1 0.6 0.6 1 0.6 1.5 0.6 1.5ds 23.5 28.5 37 41 47.5 51 57.5 68 78 91 98 109 113 117 122 120 127 133 137 143Dh 30.5 35.5 47 51.5 58 61.5 72 82 92 111 118 129 133 127 136 140 141 164 152 174C0kN 3.23 3.63 7.35 7.64 8.33 8.62 16.7 18 19.4 30.1 31.4 31.7 33.1 12.5 23.7 34 24.2 66.9 25 69.5kN 3.1 3.83 8.36 9.12 10.6 11.3 20.9 24.3 27.7 42.1 45.3 48.6 50.9 24.1 41.5 54 43.2 100 46.7 107kg 0.04 0.05 0.12 0.13 0.16 0.17 0.27 0.3 0.35 0.7 0.75 0.83 1.45 0.4 0.75 1.56 0.72 2.62 0.72 2.82Note) The model number of a type with seals attached is REUU. If a certain level of accuracy is required, this model is used for outer ring rotation.A18-25Cross-Roller Ring20 25 30 35 40 45 50 60 70 80 90Model No.Basic load rating Mass (radial) 25. Model RE (Two-piece Inner Ring Type) d4-greasing hole B1rB rDModel RE dsb a DhModel REUU Detail view of the greasing hole Unit: mmShaft diameterModel No.Inner Outer diameter diameter d140 150 160 170 180 190 200 220 240 250300 350RE 14016 RE 14025 RE 15013 RE 15025 RE 15030 RE 16025 RE 17020 RE 18025 RE 19025 RE 20025 RE 20030 RE 20035 RE 22025 RE 24025 RE 25025 RE 25030 RE 25040 RE 30025 RE 30035 RE 30040 RE 35020140 150 160 170 180 190 200 220 240 250300 350D 175 200 180 210 230 220 220 240 240 260 280 295 280 300 310 330 355 360 395 405 400Roller pitch circle Width Greasing hole diameter a b dp B B1 160 16 3 1.6 172 25 3.5 2 166 13 2.5 1.6 182 25 3.5 2 192 30 4.5 3 192 25 3.5 2 196.1 20 3.5 1.6 210 25 3.5 2 219 25 3.5 1.6 230 25 3.5 2 240 30 4.5 3 247.7 35 5 3 250.1 25 3.5 2 272.5 25 3.5 2 280.9 25 3.5 2 287.5 30 4.5 3 300.7 40 6 3.5 332 25 3.5 2 345 35 5 3 351.6 40 6 3.5 376.6 20 3.5 1.6Basic load rating Mass (radial)Shoulder heightMain dimensionsC rmin 1 1.5 0.6 1.5 1.5 1.5 1.5 1.5 1 2 2 2 2 2.5 2.5 2.5 2.5 2.5 2.5 2.5 2.5ds 147 154 158 164 173 173 184 195 202 215 221 225 235 256 268 269 275 319 322 326 363Dh 162 185 172 194 210 204 198 225 222 245 258 270 265 281 293 306 326 344 368 377 383C0kN 25.9 74.8 27 76.8 100 81.7 29 84 41.7 84.2 114 151 92.3 68.3 69.3 126 195 75.5 183 212 54.1kN 50.1 121 53.5 128 156 135 62.1 143 82.9 157 200 252 171 145 150 244 348 178 367 409 143kg 1 2.96 0.68 3.16 5.3 3.14 2.21 3.44 2.99 4 6.7 9.6 4.1 4.5 5 8.1 14.8 5.9 13.4 17.2 3.9Note) The model number of a type with seals attached is REUU. If a certain level of accuracy is required, this model is used for outer ring rotation. Model number codingRE8016 UU CC0 P4 Model numberAccuracy symbol (*2) Radial clearance symbol (*1)Seal attached on both ends (seal attached on either end: U) (*1) See A18-17. (*2) See A18-13.A18-26To download a desired data, search for the corresponding model number in the Technical site.https://tech.thk.com 26. d4-greasing hole B1rB rDModel RE dsb a DhModel REUU Detail view of the greasing hole Unit: mmShoulder heightMain dimensions Shaft diameterModel No.Inner Outer diameter diameter d400 450600400 450 500 600D 480 510 500 550 600 625 700C rmin 2.5 2.5 1 1 2.5 2.5 3ds 422 428 464 514 526 536 627Dh 459 479 484 534 572 587 673C0kN 156 241 61.7 65.5 239 267 264kN 370 531 182 201 607 653 721kg 14.5 23.5 6.6 7.3 26 41.7 29Note) The model number of a type with seals attached is REUU. If a certain level of accuracy is required, this model is used for outer ring rotation. Model number codingRE50025 UU CC0 P6 Model numberAccuracy symbol (*2) Radial clearance symbol (*1)Seal attached on both ends (seal attached on either end: U) (*1) See A18-17. (*2) See A18-13.A18-27Cross-Roller Ring500RE 40035 RE 40040 RE 45025 RE 50025 RE 50040 RE 50050 RE 60040Roller pitch circle Width Greasing hole diameter a b dp B B1 440.3 35 5 3 453.4 40 6 3.5 476.6 25 3.5 1.6 526.6 25 3.5 1.6 548.8 40 6 3 561.6 50 6 3.5 650 40 6 3Basic load rating Mass (radial) 27. USP-Grade Models RB and RE d4-greasing holer B1B r dsDRB-USPRBUU-USP d4-greasing hole DhB1rB rbDa Detail view of the greasing holeRE-USPREUU-USPUnit: mmShoulder heightMain dimensions Model No.Inner Outer diameter diameterRoller pitch circle diameter dpWidthGreasing holeBasic load rating Mass (radial) CC0d RB 10020USP RE 10020USP RB 12025USP RE 12025USP RB 15025USP RE 15025USP RB 20030USP RE 20030USP RB 25030USP RE 25030USP RB 30035USP RE 30035USP RB 40040USP RE 40040USP RB 50040USP RE 50040USP RB 60040USP RE 60040USPDRBREB B1abr mindsDhkNkNkg100150123127203.51.6111313333.150.91.45120180148.71522513316466.91002.623.521.5 16419476.81283.162212581142006.72693061262448.132236818336713.442847924153123.5526572239607266276732647212915021017818225200280240240302 4.5250330287.5287.53030039534534535353 2.5400510453.4453.440500600548.8548.840700650650403.56 60063 3Note) The model number of a type with seals attached is RBUU-USP or REUU-USP. If a certain level of rotational accuracy is required for the inner ring, select model RB; if a certain level of rotational accuracy is required for the outer ring, select model RE. Model number codingRB50040 UU CC0 USP Model numberAccuracy symbol (Ultra precision grade) Radial clearance symbol (*1)Seal attached on both ends (seal attached on either end: U) (*1) See A18-17.A18-28To download a desired data, search for the corresponding model number in the Technical site.https://tech.thk.com 28. Model RA (Separable Outer Ring Type) 4-greasing holedr B rB1DModel RA dsb Model RAUUa DhDetail view of the greasing holeUnit: mmShoulder heightMain dimensions Shaft diameterRA 5008 RA 6008 RA 7008 RA 8008 RA 9008 RA 10008 RA 11008 RA 12008 RA 13008 RA 14008 RA 15008 RA 16013 RA 17013 RA 18013 RA 19013 RA 20013Roller Inner Outer pitch circle Width Greasing hole diameter diameter diameter d D dp B B1 a b 50 66 57 8 2 0.8 60 76 67 8 2 0.8 70 86 77 8 2 0.8 80 96 87 8 2 0.8 90 106 97 8 2 0.8 100 116 107 8 2 0.8 117 8 2 0.8 110 126 120 136 127 8 2 0.8 130 146 137 8 2 0.8 140 156 147 8 2 0.8 150 166 157 8 2 0.8 160 186 172 13 2.5 1.6 170 196 182 13 2.5 1.6 180 206 192 13 2.5 1.6 190 216 202 13 2.5 1.6 200 226 212 13 2.5 1.6C rmin 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.8 0.8 0.8 0.8 0.8ds 53.5 63.5 73.5 83.5 93.5 103.5 113.5 123.5 133.5 143.5 153.5 165 175 185 195 205Dh 60.5 70.5 80.5 90.5 100.5 110.5 120.5 130.5 140.5 150.5 160.5 179 189 199 209 219C0kN 5.1 5.68 5.98 6.37 6.76 7.15 7.45 7.84 7.94 8.33 8.82 23.3 23.5 24.5 24.9 25.8kN 7.19 8.68 9.8 11.3 12.4 13.9 15 16.5 17.6 19.1 20.6 44.9 46.5 49.8 51.5 54.7kg 0.08 0.09 0.1 0.11 0.12 0.14 0.15 0.17 0.18 0.19 0.2 0.59 0.64 0.68 0.69 0.71Note) The model number of a type with seals attached is RAUU. If a certain level of accuracy is required, this model is used for inner ring rotation. Model number codingRA7008 UU CC0 Model numberRadial clearance symbol (*1)Seal attached on both ends (seal attached on either end: U) (*1) See A18-17.A18-29Cross-Roller Ring50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 200Model No.Basic load rating Mass (radial) 29. Model RA-C (Single-Split Type) 4- d0 (Greasing hole)dr B1B rDModel RAC dsModel RACUU DhUnit: mmMain dimensions Shaft diameter50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 200Model No.RA 5008C RA 6008C RA 7008C RA 8008C RA 9008C RA 10008C RA 11008C RA 12008C RA 13008C RA 14008C RA 15008C RA 16013C RA 17013C RA 18013C RA 19013C RA 20013CInner Outer diameter diameter d 50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 200D 66 76 86 96 106 116 126 136 146 156 166 186 196 206 216 226Shoulder heightRoller pitch Greasing Width circle hole diameter dp B B1 d0 57 8 1.5 67 8 1.5 77 8 1.5 87 8 1.5 97 8 1.5 107 8 1.5 117 8 1.5 127 8 1.5 137 8 1.5 147 8 1.5 157 8 1.5 172 13 2 182 13 2 192 13 2 202 13 2 212 13 2Basic load rating (radial) Crmin 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.8 0.8 0.8 0.8 0.8ds 53.5 63.5 73.5 83.5 93.5 103.5 113.5 123.5 133.5 143.5 153.5 165 175 185 195 205Dh 60.5 70.5 80.5 90.5 100.5 110.5 120.5 130.5 140.5 150.5 160.5 179 189 199 209 219C0kN 5.1 5.68 5.98 6.37 6.76 7.15 7.45 7.84 7.94 8.33 8.82 23.3 23.5 24.5 24.9 25.8kN 7.19 8.68 9.8 11.3 12.4 13.9 15 16.5 17.6 19.1 20.6 44.9 46.5 49.8 51.5 54.7Masskg 0.08 0.09 0.1 0.11 0.12 0.14 0.15 0.17 0.18 0.19 0.2 0.59 0.64 0.68 0.69 0.71Note) The model number of a type with seals attached is RACUU. If a certain level of accuracy is required, this model is used for inner ring rotation. Model number codingRA6008C UU C0 Model numberRadial clearance symbol (*1)Seal attached on both ends (seal attached on either end: U) (*1) See A18-17.A18-30 30. Point of DesignCross-Roller RingFit [Fitting of Models RU] Fitting for model RU is basically not required. However, for tting requiring positioning accuracy, h7 and H7 are recommended. [Fitting of Models RB, RE and RA] For the tting of models RB, RE and RA, we recommend using the combinations indicated in Table1. Table1 Fitting of Models RB, RE and RARadial clearanceService condition Inner ring rotational loadC0 Outer ring rotational load Inner ring rotational load C1 Outer ring rotational loadShaftHousingNormal loadh5H7Large impact and momenth5H7Normal loadg5Js7Large impact and momentg5Js7Normal loadj5H7Large impact and momentk5Js7Normal loadg6Js7Large impact and momenth5K7Note) For the tting for clearance CC0, avoid interference because it will cause an excessive preload. As for the tting when you have selected clearance CC0 for the joints or swiveling unit of a robot, the combination of g5 and H7 is recommended.Table2 Fitting of the USP-gradeRadial clearanceConditionShaft HousingInner ring rotational load h5J7Outer ring rotational load g5CC0Js7Inner ring rotational load j5J7Outer ring rotational load g5C0K7Note) It is recommended that you measure the inside and outside diameters of the bearing and provide a slight interference t for those measurements.[Fitting for Model RA-C] For the tting of model RA-C, we recommend using the combinations indicated in Table3. Table3 Fitting for Model RA-CRadial clearance CC0 C0ConditionShaft HousingInner ring rotational load h5J7Outer ring rotational load g5Js7Inner ring rotational load j5J7Outer ring rotational load g5K7A18-31Cross-Roller Ring[Fitting of the USP-grade] For the tting of the USP-grade series of models RB and RE, we recommend using the combinations indicated in Table2. 31. Designing the Housing and the Presser Flange Since the Cross-Roller Ring is a compact, thin device, special consideration must be given to the rigidity of the housing and the presser ange. With types having a separable outer ring, insufficiency in the strength of the housing, pressure ange or the presser bolt will result in the inability to evenly hold the inner or outer ring, or the deformation of the bearing when a moment load is applied. Consequently, the contact area of the rollers will become uneven, causing the bearings performance to signi cantly deteriorate. Fig.2 shows examples of installing the Cross-Roller Ring. [Housing] When determining the thickness of the housing, make sure it is at least 60% of the sectional height of the bearing as a guide. Housing thickness T=D d 2 0.6 or greater T(D: outer diameter of the outer ring; d: inner diameter of the inner ring)Ring removal tapped holeTapped Hole for Ring Removal If tapped holes for removing the inner or outer ring (Fig.1) are provided, the ring can be removed without causing damage to the bearing. When removing the outer ring, do not press the inner ring, or vise versa. For the dimensions of the presser on the side(s), see the shoulder dimensions indicated in the corresponding speci cation table.Ring removal tapped holeFig.1[Example of Assembly] Fig.2 and Fig.3 show examples of installing the Cross-Roller Ring. Example of Assembling Model REa. Outer ring rotating in the swiveling unit A heavy body part is mounted after the inner and outer rings are secured.Example 1 of assembling model RBb. Inner ring rotating in the swiveling unit (with seals attached)Fig.2 Examples of Assembling Models RE and RBA18-32Example 2 of assembling model RBc. Inner and outer rings secured in the same direction in the swiveling unit (with seals attached) 32. Point of Design Designing the Housing and the Presser FlangeExample 1 of assembling model RUExample 2 of assembling model RUd. Inner and outer rings secured in the same direction e. Inner and outer rings secured in the same direction in the swiveling unit (with seals attached) in the swiveling unit (with seals attached) Fig.3 Examples of Assembling Model RU[Presser Flange and Presser Bolt] When determining the thickness of the presser flange (F) or the clearance of the flange section (S), refer to the dimensions indicated below as a guide. As for the number of the presser bolts, the greater the number of the bolts, the more stable the system becomes. As a guide, however, it is normally appropriate to use the number of bolts indicated in Table4 and equidistantly arrange them.S = 0.5 mmEven if the shaft and the housing are made of light alloy, it is recommendable to select a steelbased material for the presser ange. When assembling model RU, use the mounting holes or tapped holes built on the inner and outer rings (model RU does not require a presser ange). When tightening the presser bolts, rmly secure them using a torque wrench or the like so that they will not loosen. Table5 shows tightening torques for the housing and presser flanges made of typical steel materials with medium hardness.HBTable4 Number of Presser Bolts and Bolt Sizes Unit: mmOuter diameter of the outer ring (D)No. of boltsBolt size (reference value)AboveOr less1008 or moreM3 to M510020012 or moreM4 to M820050016 or moreM5 to M1250024 or moreM12 or thickerTable5 Bolt Tightening TorqueUnit: N-mScrew model No.Tightening torqueScrew model No.Tightening torqueM32M1070M44M12120M59M16200M614M20390M830M22530A18-33Cross-Roller RingF = B0.5 to B1.2 0 H = B -0.1FS 33. Model No.Cross-Roller RingModel Number Coding Model number con gurations differ depending on the model features. Refer to the corresponding sample model number con guration. [Cross roller rings with integrated inner and outer rings.]Model RURU124 UU CC0 P2 B G X -N Model No.Option symbol No Symbol : No accessory -N : Grease nipple attached RU42 to RU178: NP3.23.5 RU228 to RU445: NP65Accuracy symbol (*2) Radial clearance symbol (*1)Sub-part Accuracy symbol Seal symbol No Symbol : Rotational Accuracy No Symbol : Without seal of the Inner Ring UU : Seal attached on both ends Inner Ring Hole symbol R : Rotational Accuracy U : Seal attached on either end [Available models: RU124 to RU445] of the Outer Ring (counterbore side of the outer ring) No Symbol : Inner ring counterbore hole B : Rotational Accuracy UT : Seal attached on either end X : Inner ring tapped hole (through hole) of the Inner/Outer Rings (opposite to the counterbore side of the outer ring) Mounting Hole Orientation symbol [Available models: RU124 to RU445 (excluding X type)] No Symbol : The counterbore holes of the inner and outer rings face the same direction G : The counterbore holes of the inner and outer rings face opposite direction(*1) See A18-17. (*2) See A18-12 to A18-16.[Cross Roller Ring]Models RB, RE, RA and RA-CRB20030 C UU CC0 P2 Model No. Symbol No Symbol : Models RB, RE and RA C : Model RA-C Seal symbol No Symbol : Without seal UU : Seal attached on both ends U : Seal attached on either endAccuracy symbol (*2) (models RB and RE only. For information on models RA or RA-C , contact THK.) No Symbol : Normal Grade (Grade 0) P6 : 6-grade rotational accuracy, PE6: 6-grade rotational accuracy + 6-grade dimensional accuracy P5 : 5-grade rotational accuracy, PE5: 5-grade rotational accuracy + 5-grade dimensional accuracy P4 : 4-grade rotational accuracy, PE4: 4-grade rotational accuracy + 4-grade dimensional accuracy P2 : 2-grade rotational accuracy, PE2: 2-grade rotational accuracy + 4-grade dimensional accuracy USP : USP-grade rotational accuracyRadial clearance symbol (*1) CC0 : Minus clearance (preload) C0 : Plus clearance C1 : Plus clearance (larger than C0)(*1) See A18-17. (*2) See A18-12 to A18-16.A18-34 34. Precautions on UseCross-Roller Ring[Handling] (1) The separable inner or outer ring is fastened in place using special rivets, bolts or nuts when delivered. When installing it to the system, do not disassemble it. Also, erroneously installing the spacer retainer will signi cantly affect the rotational performance of the system. Do not disassemble the bearing. (2) The matching mark of the inner or outer ring may be slightly misaligned when delivered. In that case, loosen the bolts that secure the inner or outer ring, and correct the alignment using a plastic hammer or the like, before installing it to the housing. (Let the securing rivets follow the housing.) (3) When installing or removing the Cross-Roller Ring, do not apply force to the xing rivets or the bolts. (4) When mounting the presser ange, take into account the dimensional tolerances of the parts so that the ange rmly holds the inner and outer ring from the side. (5) Dropping or hitting the Cross-Roller Ring may damage it. Giving an impact force to the bushing could also cause damage even if the product looks intact.[Precautions on Use] (1) Entrance of foreign material may cause damage to the ball circulating path or functional loss. Prevent foreign material, such as dust or cutting chips, from entering the system. (2) Contact THK if you desire to use the product at a temperature of 80 or higher. (3) If planning to use the Cross-Roller Ring in an environment where a coolant penetrates into the product, contact THK. (4) If foreign material adheres to the product, replenish the lubricant after cleaning the product. (5) When using the product in locations exposed to constant vibrations or in special environments such as clean rooms, vacuum and low/high temperature, contact THK in advance.A18-35Cross-Roller Ring[Lubrication] (1) Since each Cross-Roller Ring unit contains high-quality lithium soap group grease No. 2, you can start using the product without replenishing grease. However, the product requires regular lubrication since it has a smaller internal space than ordinary roller bearings and because the rollers need frequent lubrication due to their rolling contact structure. To replenish grease, it is necessary to secure greasing holes that lead to the oil grooves formed on the inner and outer rings. As for the lubrication interval, normally replenish grease of the same group so that it is distributed throughout the interior of the bearing at least every six to twelve months. When the bearing is lled up with grease, the initial rotational torque temporarily increases. However, surplus grease will run off of the seals and the torque will return to the normal level in a short period. The thin type does not have an oil groove. Secure an oil groove inside the housing for lubrication. (2) Do not mix greases with different physical properties. (3) In locations exposed to constant vibrations or in special environments such as clean rooms, vacuum and low/high temperature, normal lubricants may not be used. Contact THK for details. (4) When planning to use a special lubricant, contact THK before using it. 35. A18-36