Patent Pending
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2013
PEM® SFN™- Introduction
•
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.
•
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.
SFN™ Spinning Flare Nut
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PEM® SFN™- Key Benefits Overview
SFN™ Sample Panels
Opportunity:
Loose hardware causes
assembly issues as
assembler 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.
SFN™ Spinning Flare Nut
Trademark
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
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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 techsupport@pemnet.com
for your specific application requirements.
SFN™ Spinning Flare Nut
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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 techsupport@pemnet.com as we
have tooling options available.
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PEM® SFN™- Installation Tooling & Animation
Animation of SFN™ installation is available online in the “nut” category at
http://www.pemnet.com/design_info/animation_library.html
SFN™ Spinning Flare Nut
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PEM® SFN™- Performance Data
•
Regulatory compliance information is available in Technical Support section of
the PennEngineering website.
SFN™ Spinning Flare Nut
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PEM® SFN™- Application Notes
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 techsupport@pemnet.com for
your specific application requirements.
Design Intent
Nut Thread Engagement:
Intent – failure of screw in thread
Nut Proof Load Performance:
Tensile load of 8.8 stud
Nut Hardness:
Symbols:
M5
SFN –Spinning Flare Nut
M6
M8
Exceeds ratio 0.8D.
Expected failure of screw in thread.
Exceeds ratio 0.8D.
Expected failure of screw in thread.
Exceeds ratio 0.8D.
Expected failure of screw in thread.
Meets proof load of 12,140N
Meets proof load of 17,200N
Meets proof load of 31,800N
Does not exceed Vickers hardness (HV) 353.
Not marked as property class.
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.
SFN™ Spinning Flare Nut
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©©2013
2013
PEM® SFN™- Solution – OEM Customer
Application
SFN™ Benefit
•
Assembly time reduction & cost
•
Reduction in loose hardware
•
Automated assembly of nut to bracket
•
Improved performance
SFN™ Cost Comparison
Overview
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.
SFN™ Spinning Flare Nut
Assembly Cost
Fastener cost
Loose nut
Clinch
Installation Method
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© 2013
PEM® SFN™- Solution - Process Cost Saving
Process Cost Saving
Operator tightens the nut
using the driver
0.4
0.35
0.3
€
0.25
0.2
0.15
0.1
Annual Assembly
Process Cost Saving
Operator picks up power
driver
5s
4s
5s
-23%
3s
2s
4s
4s
Operator places loose nut
onto stud and starts to screw
down the nut
Operator picks up loose nut
Process time saving :
5 seconds per nut
4s
0.05
3s
3s
Cost - Current
Solution
Cost - PEM Solution
Operator places bracket over
stud
0
SFN™ Spinning Flare Nut
Assembly Rate $79 / hr
= $0.0222 / second
Operator picks up bracket
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Process Cost Saving :
$0.1065 per nut
(Highlighted in Red Text)
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© 2013
PEM® SFN™- Bulletin
SFN™ Spinning Flare Nut
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