8

Technical remarksSealing types and threaded bores

General Technical Information

Experience plus ideas

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369

Technical remarks

Pg. 370-374

Sealing types and threaded bores

Pg. 375-377

Contents Page

370

General Information by security

• The couplings, flanges, valves and other componentsdescribed in this catalogue are intended exclusively forfluid applications. They cover the spectrum from normalto extreme operating conditions.

• A precondition for the highest possible performance andfunctional reliability with VOSS products is that the respective assembly instructions, operating conditionsand tube recommendations are observed. Failure tocomply with this information can impair the function andwill result in the voiding of our warranty.

• Coupling elements must not be retightened or loosenedwhile pressurised.Caution: Risk of serious injury or even death!

• Tubework must be laid in such a way that in unassembled state the tubes lie strain-free and all coupling elements can be easily installed.

• Please pay attention to cleanliness at all times when working with hydraulic components. Impurities or damage can impair the function of individual componentsor even the whole hydraulic system.

• Please observe the respective manufacturer’s instructionswhen working with lubricants.

• Please observe the respective operating instructions atall times when working with VOSS pre-assembly machi-nes/apparatus and tools. Failure to observe these canresult in dangers for human life and the environment.

Standardisation

The design and dimensions of VOSS cutting ring couplings,VOSSFormSQR tube couplings, flared couplings and flangescorrespond to the latest version of the standardDIN 2353/ISO 8434-1/DIN 3861/SAE J 518 C.

Permissible pressures

The pressures specified in this catalogue refer to

• Nominal pressure (PN) according to DIN 2401 T1The nominal pressures (PN) apply for static loads andtemperatures up to 120 °C as permissible operatingpressures with 4-fold safety margin.

• Permissible operating pressure (PP) according toDIN 2401 T1 The specifications “Operating pressure”(PP) are understood under normal operation conditions(up to 120 °C, static load) with a safety margin of 2.5.

For the tube-side cutting ring, VOSSFormSQR or flared coupling, the safety margin is always 4-fold. However, please always note the respective pressure specifications ofthe entire article. With increased loading of tube couplings(temperatures over 120 °C, major sudden pressure increa-ses etc.), the operating pressure must be reduced for anunchanging safety margin.

For the functional safety it is assumed that the tubingsystem is kept stable with tube brackets. The recommen-ded tightening torques must be used for articles with threaded studs. The specified pressures always refer to thecoupling. For the tube the pressure specifications of thecorresponding manufacture must be observed.

Permissible operating temperatures

Coupling and flange material

For all steel coupling and flange parts listed in this catalo-gue, the temperature range from -40 °C to +120 °C applies(also see the German standard DIN 3859 T 1). When the temperature limits are exceeded, correspondingsudden pressure increases must be taken into account.

Technical remarks

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371

Pressure stage increase

VOSS Fluid couplings can also be used at system pressu-res above the standard to date. This increase in performan-ce is achieved thanks to a changeover to higher-strengthmaterials.

Please refer to this catalogue for the respective pressuredata.

Important features of the pressure stage increase

• Heavy series (S) can be used at system pressures up to800 bar.

• Light series (L) can be used at system pressures up to500 bar.

• Demands of the DIN/ISO standards are far surpassed.

• Cost savings through the use of the light series insteadof the heavy series.

• Savings in space through the use of the light series instead of the heavy series.

• Reduction in assembly forces through the use of the lightseries instead of the heavy series.

• No change in the existing dimensions.

• No change in the existing assembly parameters.

Demanded load-bearing strength to DIN EN ISO 8434-1

Load-bearing strength of VOSScouplings with pressure stage increase

372

Applied standards

1) see Page 373 (recommended steel tubes)

Sealing materials

NBR is standard eg. Perbunan (registered trademark ofBayer)• for couplings and flared cones 70 - 80 Shore A• for ZAKO rings 90 Shore A• temperature range -35° C to +100° C

FPM/FKM available on request eg. Viton® (registered trade-mark of DuPont Dow Elastomers)• for couplings, flared cones and ZAKO rings 75 -85 Shore A• temperature range -25° C to +200° C

For elastomer seals, the information in DIN 7716 (require-ments for storage, cleaning and maintenance) must beobserved.• Storage dry and not over +25° C• Protect from direct sunlight, ozone and strong artificial

lighting

Materials

In the standard version, VOSS cutting ring couplings,VOSSFormSQR, flared couplings, valves and flanges are offorged, drawn and in exceptional cases also cast steel inaccordance with DIN 3859-1.

Surface protection

VOSS Zink-Nickel is the new surface protection with whichall standard products from VOSS Fluid are provided.

A total of three layers consisting of a zinc-nickel basic layer,a passivation and a sealing coat provide optimum corrosionprotection for the whole component.

Important features are:

• Highest corrosion protection against red rust even afterhandling and assembly.

• The zinc-nickel basic layer has a several times highercorrosion resistance than zinc.

• White rust occurs only in the form of a slight grey coa-ting, no bulky white corrosion degradation product (zincoxide): “blooming”.

• Occurrence of red rust (in accordance with DIN EN ISO9227) > 720 h.

• The friction values remain unchanged compared withyellow chromating (A3C).

• The total coating thickness is 6-15 µm.• The zinc-nickel basic layer has a nickel content of 12-

16%

Coating build-upSealing layer (thickness up to 2 µm)Passivation (layer thickness liesin the nanometre range)

Zinc-nickel (basic layer; layer thickness up to 12 µm)

Steel (base metal)

Couplings Technical terms and conditionsNational International National International

Cutting ring couplings DIN 2353 ISO 8434-1 DIN 3859 T 1Cutting rings DIN 3861 ISO 8434-1Taper couplings DIN 3942-45 ISO 8434-4 Precision steel tubes24° taper with O-ring DIN 3865 National InternationalFlanges SAE J 518 C EN 10305-1/DIN 16301) ISO 3304

Threaded studs Threaded boresMetric fine thread National International National International

Sealing with seal ring DIN 7603 DIN 3852 T 1 Type A DIN 3852 T 1 Type XSealed with seal edge DIN 3852 T 1 Type B ISO 9974-3 DIN 3852 T 1 Type X ISO 9974-1Sealed with PEFLEX ring DIN 3852 T 11 Type E ISO 9974-2 DIN 3852 T 1 Type X ISO 9974-1Sealed with O-ring ISO 6149-2/-3 ISO 6149-1Sealing with taper thread DIN 3852 T 1 Type C DIN 3852 T 1 Type Z

Threaded studs Threaded boresWhitworth pipe thread/UN-UNF/NPT National International National International

Sealing with seal ring DIN 7603 DIN 3852 T 2 Type A DIN 3852 T 2 Type XSealed with seal edge DIN 3852 T 2 Type B ISO 1179-4 DIN 3852 T 2 Type X ISO 1179-1Sealed with PEFLEX ring DIN 3852 T 11 Type E ISO 1179-2 DIN 3852 T 2 Type X ISO 1179-1Sealing with O-ring (UN-UNF) ISO 11926-2/-3/SAE J 514 ISO 11926-1

SAE J 514Sealing with taper thread DIN 3852 T 2 Type C DIN 3852 T 2 Type ZSealing with taper thread (NPT) ANSI/ASME B 1.20.1-1983 ANSI/ASME

B 1.20.1-1983

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4 x 0.56 x 1 6 x 1 6 x 1 6 x 1 6 x 1.5 6 x 28 x 1 8 x 1 8 x 1 8 x 1.5 8 x 2 8 x 2.5

10 x 1 10 x 1 10 x 1.5 10 x 2 10 x 2.5 10 x 312 x 1 12 x 1.5 12 x 2 12 x 2.5 12 x 3 12 x 414 x 1.5 14 x 1.5 14 x 2 14 x 2.5 14 x 3 14 x 515 x 1.5 15 x 1.5 15 x 2 15 x 3 15 x 3.516 x 1.5 16 x 1.5 16 x 2 16 x 2.5 16 x 318 x 1.5 18 x 1.5 18 x 2 18 x 2.520 x 1.5 20 x 2.5 20 x 2.5 20 x 3 20 x 3.522 x 1.5 22 x 2 22 x 2.5 22 x 325 x 2 25 x 2 25 x 3 25 x 4 25 x 4.528 x 2 28 x 2 28 x 330 x 2 30 x 2.5 30 x 4 30 x 5 30 x 635 x 2 35 x 3 35 x 438 x 2.5 38 x 4 38 x 5 38 x 6 38 x 742 x 3 42 x 4 42 x 550 x 5 50 x 5 50 x 6 50 x 8 50 x 9 (50 x 8)1)

60 x 5 60 x 5 60 x 10 60 x 10 60 x 101)

65 x 4 65 x 5 65 x 8 65 x 875 x 12.5 75 x 12.5 75 x 12.5 75 x 12.5 75 x 12.51)

80 x 8 80 x 8 80 x 1088 x 14 88 x 14 88 x 14 88 x 14 88 x 141)

101.6 x 161) 101.6 x 161) 101.6 x 161) 101.6 x 161) 101.6 x 161)

114.3 x 17.51) 114.3 x 17.51) 114.3 x 17.51)

120 x 20 120 x 20 120 x 20

Table: Nominal pressure PN/tube dimension RAD x S100 bar 160 bar 250 bar 315 bar 400 bar 630 bar

1) Tubes of material 1.0581+N

The union nuts are additionally coated with lubricant.

The surface protection of ZAKO flange couplings is carbo-nised and oiled.

The welding parts are of bare metal and oiled.

The digits in position 7 and 8 of the order number docu-ment the material and the surface protection of the article,e.g.

00 = Steel without surface protection, oiled19 = blackened and oiled20 = Steel, VOSS Zink-Nickel21 = Steel, VOSS Zink-Nickel and waxed50 = Brass60 = Stainless steel, material 1.4571

Other versions with regard to the material and surface pro-tection are also available on request.

DimensionsThe dimensions in the catalogue are adapted to the currentstandards. We reserve the right to make changes due tofurther technical development.

PatentsWe refer to our domestic and foreign patents, designpatents, registered trademarks and industrial property rightsapplied for.

CertificationsSee Chapter 9 for certifications

Tightening torques for threadedboresThe tightening torques refer to steel couplings and a matingmaterial with a tensile strength ≥ 350 N/mm2. The threadedstuds must be oiled before screwing in.

Steel couplings with increased pressure stage require amating material with a tensile strength of ≥ 600 N/mm2.

The compliance with the recommended tightening torquesis a condition for the full utilisation of the pressure specifica-tions and the corresponding safety margins.

The tightening torques for the screw-in threads are listed asrecommendations in the tables of the corresponding cou-pling types.

Recommended steel tubes

The following table is a tube recommendation for the tubecouplings listed in the catalogue.

The table values refer to DIN 2413 class III dynamic loadsup to 120° C with the tube material 1.0255+N withoutcorrosion supplement.

There are different national and international standards forthe calculation of the tubes under inside pressure.

374

Ser

ies

Tube

-OD Wall thickness

0.5 0.75 1 1.5 2 2.5 3 3.5 4

LL

4

5

6 •

8 •

L

6 • •

8 • •

10 • •

12 • • ••

15 • • •

18 • • • ••

22 • • • •• ••

28 • • • •• ••

35 • • • • •• ••

42 • • • • •• ••

S

6 • •

8 • •

10 • •

12 • • ••

14 • • •

16 • • • ••

20 • • • • ••

25 • • • • ••

30 • • • • • ••

38 • • • • • • •• ••

We refer to the standard DIN EN 13480-3, which coversthe various load cases in great detail.

The tube manufacturer's specifications must beobserved!For steel couplings we recommend the seamless precisionsteel tubes EN 10305-1 - 1.0255 + N or EN 10305-1-1.0580 + N (St 37.4 or St 52.4 according to DIN 1630,NBK in the delivered state, with a maximum hardness of75 HRB).

Note regarding stainless-steel tubes:When using stainless-steel tubes, please use only seamlesscold-drawn, bright annealed and heat-treated qualitiesaccording to EN 10305-1 and DIN EN 10216-5-CFD. Thin-walled steel tubes must be provided with reinforcingsleeves to stabilise the coupling.

Pipework assembly with reinforcement sleeves• Reinforcement sleeves requiredo Reinforcement sleeves recommended

Assembly of VOSS reinforcement sleeves1. Insert the sleeve up to the knurled neck into the pipe.

2. Drive in the sleeve completely using a hammer (plastic orhard rubber). The knurled neck is thereby pressed intothe inner wall of the pipe, securing the sleeve againstshifting or falling out.

3. Carry out cutting ring assembly.

Coupling with reinforcement sleeve

Sleeve driven in

Sleeve inserted

Media-resistant

The VOSS cutting ring, VOSSFormSQR tube couplings, flaredcouplings and flanges are designed for the use of standardhydraulic oils up to +100° C and compressed air up to+80° C.

With critical media, e. g. hardly inflammable pressure fluids,our customer service should be consulted before use.

Ordering

All articles listed in this catalogue are shipped as illustrated– completely equipped with the coupling parts. To improvestorage and protect against soiling and damage, shippingis carried out in closed packing units.

The orders should be matched to these packing units. Thequantities for the individual packing units are contained inthe respectively valid price list. If smaller quantities arerequired which are less than the contents of the packingunit, we recommend purchasing these from our dealers.

Customer service

Our customer service representatives would be delighted tobe of assistance to you. Please do not hesitate to contactour sales office in Wipperfürth, Germany or any of our salesrepresentatives.

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DIN 38524 - - M 8 x 1 12 13 1 86 / 8 6 - M 10 x 1 14 20 15 13,9 1 8- 8 6 M 12 x 1,5 17 25 18 16,9 1,5 12- 10 8 M 14 x 1,5 19 25 20 18,9 1,5 12- 12 10 M 16 x 1,5 21 28 23 2) 21,9 1,5 12- 15 12 M 18 x 1,5 23 30 25 2) 23,9 2 12- - 14 M 20 x 1,5 25 34 27 2) 25,9 2 14- 18 16 M 22 x 1,5 27 34 28 26,9 2,5 14- 22 - M 26 x 1,5 31 42 33 2) 31,9 2,5 16- - 20 M 27 x 2 32 42 33 31,9 2,5 16- 28 25 M 33 x 2 39 47 41 2) 39,9 2,5 18- 35 30 M 42 x 2 49 56 51 49,9 2,5 20- 42 38 M 48 x 2 55 65 56 54,9 2,5 22

ISO 6149- 6 - M 10 x 1 14,5 16 11,1 13,8 1 10 1,6 12- 8 6 M 12 x 1,5 17,5 19 13,8 16,8 1,5 11,5 2,4 15- 10 8 M 14 x 1,5 19,5 21 15,8 18,8 1,5 11,5 2,4 15- 12 10 M 16 x 1,5 22,5 24 17,8 21,8 1,5 13 2,4 15- 15 12 M 18 x 1,5 24,5 26 19,8 23,8 2 14,5 2,4 15- 18 16 M 22 x 1,5 27,5 29 23,8 26,8 2 15,5 2,4 15- 22 20 M 27 x 2 32,5 34 29,4 31,8 2 19 3,1 15- 28 25 M 33 x 2 41,5 43 35,4 40,8 2,5 19 3,1 15- 35 30 M 42 x 2 50,5 52 44,4 49,8 2,5 19,5 3,1 15- 42 38 M 48 x 2 55,5 57 50,4 54,8 2,5 22 3,1 15

375

DIN 38524 - - M 8 x 1 12 13 1 86 / 8 6 - M 10 x 1 14 20 15 13.9 1 8- 8 6 M 12 x 1.5 17 25 18 16.9 1.5 12- 10 8 M 14 x 1.5 19 25 20 18.9 1.5 12- 12 10 M 16 x 1.5 21 28 23 2) 21.9 1.5 12- 15 12 M 18 x 1.5 23 30 25 2) 23.9 2 12- - 14 M 20 x 1.5 25 34 27 2) 25.9 2 14- 18 16 M 22 x 1.5 27 34 28 26.9 2.5 14- 22 - M 26 x 1.5 31 42 33 2) 31.9 2.5 16- - 20 M 27 x 2 32 42 33 31.9 2.5 16- 28 25 M 33 x 2 39 47 41 2) 39.9 2.5 18- 35 30 M 42 x 2 49 56 51 49.9 2.5 20- 42 38 M 48 x 2 55 65 56 54.9 2.5 22

ISO 6149- 6 - M 10 x 1 14.5 16 11.1 13.8 1 10 1.6 12- 8 6 M 12 x 1.5 17.5 19 13.8 16.8 1.5 11.5 2.4 15- 10 8 M 14 x 1.5 19.5 21 15.8 18.8 1.5 11.5 2.4 15- 12 10 M 16 x 1.5 22.5 24 17.8 21.8 1.5 13 2.4 15- 15 12 M 18 x 1.5 24.5 26 19.8 23.8 2 14.5 2.4 15- 18 16 M 22 x 1.5 27.5 29 23.8 26.8 2 15.5 2.4 15- 22 20 M 27 x 2 32.5 34 29.4 31.8 2 19 3.1 15- 28 25 M 33 x 2 41.5 43 35.4 40.8 2.5 19 3.1 15- 35 30 M 42 x 2 50.5 52 44.4 49.8 2.5 19.5 3.1 15- 42 38 M 48 x 2 55.5 57 50.4 54.8 2.5 22 3.1 15

1) 0.1 ≤ M 22 x 1.50.2 ≥ M 26 x 1.5

2) Deviating from DIN 3852

Sealing types andthreaded bores

For VOSS tube couplings

Thread:metric fine thread, straight

PEFLEX and O-ring seals ofNBR are standard-35° C to +100° C

of FPM/FKM on request-25° C to +200° C

Threaded stud as perDIN 3852 T 1 type A(sealed with seal ring asper DIN 7603)

Threaded stud as perDIN 3852 T 1 type B/ISO 9974-3(sealed with sealedge)

Threaded stud asper DIN 3852 T 11type E/ISO 9974-2(sealed with PEFLEXring)

Threaded stud asper ISO 6149-2 and -3(sealed with O-ring)

Threaded bore as perDIN 3852 T 1 type X/ISO 9974-1(for straight threaded studs)

Threaded boreISO 6149-1(for straight threaded studs)

Tube OD d1 d3 d4 d4 (wide) d4 (narrow) d5 d7 d8 a1 b1 L1 Z°LL L S +0.4 +0.4 +0.4 +0.1 ±0.2 max. min. +0.4 ±1°

DIN 38524 - 8 6 - G 1/8 A 14 19 15 13,9 1 8- 8 / 10 6 / 8 G 1/4 A 18 25 20 2) 18,9 1,5 12- 12 10 / 12 G 3/8 A 22 28 23 21,9 2 12- 15 / 18 14 / 16 G 1/2 A 26 34 28 2) 26,9 2,5 14- 22 20 G 3/4 A 32 42 33 31,9 2,5 16- 28 25 G 1 A 39 47 41 2) 39,9 2,5 18- 35 30 G 1 1/4 A 49 58 51 2) 49,9 2,5 20- 42 38 G 1 1/2 A 55 65 56 54,9 2,5 22

ISO 11926- 8 / 10 8 7/16-20 UNF-2A 15 21 12,4 14,4 1,6 11,5 2,4 12- 12 10 / 14 9/16-18 UNF-2A 18 25 15,6 17,6 1,6 12,7 2,5 12- 12 - 18 12 - 20 3/ 4-16 UNF-2A 23 30 20,6 22,3 2,4 14,3 2,5 15- 12 - 22 16 - 20 7/ 8-14 UNF-2A 26 34 23,9 25,5 2,4 16,7 2,5 15- 22 / 28 20 / 25 1 1/16-12 UN -2A 32 41 29,2 31,9 2,4 19 3,3 15- 22 - 35 25 / 30 1 5/16-12 UN -2A 39 48,9 35,5 38,2 3,2 19 3,3 15- 35 - 42 30 / 38 1 5/ 8-12 UN -2A 48 58 43,5 47,7 3,2 19 3,3 15

376

DIN 38524 - 8 6 - G 1/8 A 14 19 15 13.9 1 8- 8 / 10 6 / 8 G 1/4 A 18 25 20 2) 18.9 1.5 12- 12 10 / 12 G 3/8 A 22 28 23 21.9 2 12- 15 / 18 14 / 16 G 1/2 A 26 34 28 2) 26.9 2.5 14- 22 20 G 3/4 A 32 42 33 31.9 2.5 16- 28 25 G 1 A 39 47 41 2) 39.9 2.5 18- 35 30 G 1 1/4 A 49 58 51 2) 49.9 2.5 20- 42 38 G 1 1/2 A 55 65 56 54.9 2.5 22

ISO 11926- 8 / 10 8 7/16-20 UNF-2A 15 21 12.4 14.4 1.6 11.5 2.4 12- 12 10 / 14 9/16-18 UNF-2A 18 25 15.6 17.6 1.6 12.7 2.5 12- 12 - 18 12 - 20 3/ 4-16 UNF-2A 23 30 20.6 22.3 2.4 14.3 2.5 15- 12 - 22 16 - 20 7/ 8-14 UNF-2A 26 34 23.9 25.5 2.4 16.7 2.5 15- 22 / 28 20 / 25 1 1/16-12 UN -2A 32 41 29.2 31.9 2.4 19 3.3 15- 22 - 35 25 / 30 1 5/16-12 UN -2A 39 48.9 35.5 38.2 3.2 19 3.3 15- 35 - 42 30 / 38 1 5/ 8-12 UN -2A 48 58 43.5 47.7 3.2 19 3.3 15

1) 0.1 ≤ G 1/20.2 ≥ G 3/4

3) For Whitworth pipe threads(female thread), "A" is not applicable

2) Deviating from DIN 3852 4) Threaded bore UN-UNF-2B

Tube OD d1 d3 d4 d4 (wide) d4 (narrow) d5 d7 d8 a1 b1 L1 Z°LL L S 3) 4) +0.4 +0.4 +0.4 +0.1 ±0.2 max. min. +0.4 ±1°

Sealing types andthreaded bores

For VOSS tube couplings

Thread:Whitworth pipe thread,UN/UNF thread,straight

PEFLEX and O-ring seals of NBR are standard-35° C to +100° C

of FPM/FKM on request-25° C to +200° C

Threaded boreISO 11926-1/SAE J 514(for straight threaded studs)

Threaded bore as perDIN 3852 T 2 type X/ISO 1179-1(for straight threaded studs)

Threaded stud asper ISO 11926-2and 3/SAE J 514(sealed with O-ring)

Threaded stud asper DIN 3852 T 11type E/ISO 1179-2(sealed with PEFLEXring)

Threaded stud as perDIN 3852 T 2 type A(sealed with seal ring asper DIN 7603)

Threaded stud as perDIN 3852 T 2 type B/ISO 1179-4(sealed with sealedge)

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377

1) Freedom from leaks only with liquid or duc-tile sealing material

Series Tube OD d2 b2 d2 b2 d2 b2min. min. min.

Threaded stud as perDIN 3852 T1/T2 type CSealed with taper thread

Threaded stud NPTANSI/ASME B 1.20.1 – 1983Sealed with taper thread

Threaded bore as perDIN 3852 T1/T2 type Z 1)

(for tapered threaded stud)

Threaded bore NPTANSI/ASME B 1.20.1 – 1983for taper thread

Sealing types andthreaded bores

For VOSS tube couplings

Thread:metric fine thread,tapered

Whitworth pipe thread,tapered

NPT thread

LL 4 M 8 x 1 taper 5.5 R 1/8 5.5 1/8 NPT 11.6LL 6 M 10 x 1 taper 5.5 R 1/8 5.5 1/8 NPT 11.6LL 8 M 10 x 1 taper 5.5 R 1/8 5.5 1/8 NPT 11.6

L 6 M 10 x 1 taper 5.5 R 1/8 5.5 1/8 NPT 11.6L 8 M 12 x 1.5 taper 8.5 R 1/4 8.5 1/4 NPT 16.4L 10 M 14 x 1.5 taper 8.5 R 1/4 8.5 1/4 NPT 16.4L 12 M 16 x 1.5 taper 8.5 R 3/8 8.5 3/8 NPT 17.4L 15 M 18 x 1.5 taper 8.5 R 1/2 10.5 1/2 NPT 22.6L 18 M 22 x 1.5 taper 10.5 R 1/2 10.5 1/2 NPT 22.6L 22 M 26 x 1.5 taper 10.5 R 3/4 13 3/4 NPT 23.1L 28 M 33 x 2 taper 12 R 1 16 1 NPT 27.8L 35 M 42 x 2 taper 13 R 1 1/4 17 1 1/4 NPT 28.3L 42 M 48 x 2 taper 13 R 1 1/2 17 1 1/2 NPT 28.3

S 6 M 12 x 1.5 taper 8.5 R 1/4 8.5 1/4 NPT 16.4S 8 M 14 x 1.5 taper 8.5 R 1/4 8.5 1/4 NPT 16.4S 10 M 16 x 1.5 taper 8.5 R 3/8 8.5 3/8 NPT 17.4S 12 M 18 x 1.5 taper 8.5 R 3/8 8.5 3/8 NPT 17.4S 14 M 20 x 1.5 taper 10.5 R 1/2 10.5 1/2 NPT 22.6S 16 M 22 x 1.5 taper 10.5 R 1/2 10.5 1/2 NPT 22.6S 20 M 27 x 2 taper 12 R 3/4 13 3/4 NPT 23.1S 25 M 33 x 2 taper 12 R 1 16 1 NPT 27.8S 30 M 42 x 2 taper 13 R 1 1/4 17 1 1/4 NPT 28.3S 38 M 48 x 2 taper 13 R 1 1/2 17 1 1/2 NPT 28.3