© 2013 © 2013 patent pending. © 2013 © 2013 sfn spinning flare nut 2 pem ® type sfn spinning...

© 2013www.pemnet.com © 2013

Patent Pending

© 2013www.pemnet.com © 2013SFN™ Spinning Flare Nut 2

• PEM® Type SFN™ spinning flare nut is a one piece, flanged hex nut that installs by simply pressing it into a properly sized, pre-punched embossed mounting hole.

• The nut is permanently captive and still spins freely in the sheet. This allows quick attachment to mating hardware, eliminating much of the need for loose fasteners.

PEM® SFN™- Introduction

•Above the sheet, the part appears identical to standard flanged hex nuts, while on the other side, the part remains flush.

•The spinning flare nut eliminates loose hardware such as flange nuts.

•When used with a self-clinching stud, all loose hardware is eliminated from the applications.

© 2013www.pemnet.com © 2013SFN™ Spinning Flare Nut

Opportunity:

Loose hardware causes assembly issues asassembler needs to hold panel, nut and driver for the first nut.

Spinning Flare Nut Solution:

SFN™ spinning flare nut is a hexagonal flange nut that is loosely captivated and free to spin in the sheet.

Key Benefits:

•Rotates freely in sheet•It reduces assembly time and cost•There is a reduction in loose hardware (electrical/electronic environment, legislation, design for manufacture)•Installs into any sheet hardness•Nut can be automatically assembled to the panel•It can be used in conjunction with PEM® Self-Clinch stud

PEM® SFN™- Key Benefits Overview

SFN™ Sample Panels Trademark

3


PEM® SFN™- Catalog Offering

• Available in M5, M6 & M8 sizes for sheet thickness 1.0 & 1.5mm

• As needed, please contact our technical support at [email protected] for your specific application requirements.


PEM® SFN™- Installation

The PEM® SFN™ range of products, will go to market with Pre-emboss of the panel as the default installation process.

Characteristics of Pre-emboss: Emboss shape created in panel as first step.

Could be part of the bracket stamping operation or as a stand-alone emboss press.

Very simple PEMSERTER® tapered flare tool for nut installation.

Plating and coatings can be added after emboss stage – reduces risk of damage to coatings in area to be embossed.

If your application requires installation into a flat sheet, please contact our technical support at [email protected] as we have tooling options available.


PEM® SFN™- Installation Tooling & Animation

SFN™ Spinning Flare Nut

Animation of SFN™ installation is available online in the “nut” category at http://www.pemnet.com/design_info/animation_library.html


PEM® SFN™- Performance Data

SFN™ Spinning Flare Nut

• Regulatory compliance information is available in Technical Support section of the PennEngineering website.


Property Class:

•The design of SFN™ nuts meets or exceeds proof load requirements of Property Class 8 per ISO 898 Part 2, but because of their unique design they are not marked with a grade marking. Please contact our technical support at [email protected] for your specific application requirements.

Torque-Tension Behaviour:

•Because of the concave flange the effective friction radius for the nut face is larger than typical resulting in a larger than typical nut factor or “K” value. For joints in which the induced preload is critical, torque-tension studies simulating actual joint conditions are recommended to determine the appropriate tightening torque. Samples of type SFN™

nuts are available for testing.

PEM® SFN™- Application Notes

Design IntentSFN – Spinning Flare Nut

M5 M6 M8Nut Thread Engagement:Intent – failure of screw in thread

Exceeds ratio 0.8D. Expected failure of screw in thread.



Nut Proof Load Performance:Tensile load of 8.8 stud

Meets proof load of 12,140N Meets proof load of 17,200N Meets proof load of 31,800N

Nut Hardness:

Does not exceed Vickers hardness (HV) 353.

Symbols:

Not marked as property class.

© 2013www.pemnet.comSFN™ Spinning Flare Nut 9

ApplicationApplicationApplicationApplication

OverviewOverviewOverviewOverview

SFN™ BenefitBenefitSFN™ BenefitBenefit

SFN™ Cost Comparison Cost Comparison SFN™ Cost Comparison Cost Comparison

• Assembly time reduction & cost

• Reduction in loose hardware

• Automated assembly of nut to bracket

• Improved performance

Customer uses loose nuts to assemble supporting brackets. These range from 1.5 – 2.0mm steel both electroplated and KTL painted. This causes assembly issues as person needs to hold bracket, nut and driver for the first nut. Project to design a captive nut which is free to spin.

Loose nut Clinch

Installation Method

Assembly Cost

Fastener cost

PEM® SFN™- Solution – OEM Customer

© 2013www.pemnet.comSFN™ Spinning Flare Nut 10

Assembly Rate $79 / hr

= $0.0222 / second

Process time saving :

5 seconds per nut

Process Cost Saving : $0.1065 per nut

(Highlighted in Red Text)

Annual Assembly Annual Assembly Process Cost SavingProcess Cost Saving

Annual Assembly Annual Assembly Process Cost SavingProcess Cost Saving

0

0.05

0.1

0.15

0.2

0.25

0.3

0.35

0.4

Cost - Current Solution

Cost - PEM Solution

€

Process Cost SavingOperator tightens the nut using the driver

Operator picks up power driver

Operator places loose nut onto stud and starts to screw down the nut

Operator picks up loose nut

Operator places bracket over stud

Operator picks up bracket

-23%

3 s

4 s

2 s

3 s

4 s

5 s

5 s

4 s

4 s

3 s

PEM® SFN™- Solution - Process Cost Saving

© 2013 © 2013 patent pending. © 2013 © 2013 sfn spinning flare nut 2 pem ® type sfn spinning...

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