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Locking and Non-locking Threads
These fasteners provide load-bearing threads in thin sheets and permit up to .030” adjustment for mating hole misalignment.
The self-clinching feature offers fast and simple assembly. The fasteners are squeezed into prepared holes using any standard press. The sheet remains flush on one side, and the fastener is permanently locked in place.
Extra strength and support in assembly is obtained by the threads of the floating nut extending fully into themore retainer shank (a unique PEM feature). A self-locking version of the fastener is also offered. Thread locking torque performance is equivalent to applicable NASM25027 specifications.
Non-locking Type A4 and self-locking Type LA4 fasteners provide load-bearing threads in stainless steel sheets as thin as .038” with hardness up to HRB 88 on the Rockwell “B” scale.
Many PEM Type AS and AC self-clinching floating fasteners correspond to sizes in US NASM45938/11 specifications. Check our web site for a complete Military Specification and National Aerospace Standards Reference Guide (Bulletin NASM). less
These fasteners provide load-bearing threads in thin sheets and permit up to .030” adjustment for mating hole misalignment.
The self-clinching feature offers fast and simple assembly. The fasteners are squeezed into prepared holes using any standard press. The sheet remains flush on one side, and the fastener is permanently locked in place.
Extra strength and support in assembly is obtained by the threads of the floating nut extending fully into themore retainer shank (a unique PEM feature). A self-locking version of the fastener is also offered. Thread locking torque performance is equivalent to applicable NASM25027 specifications.
Non-locking Type A4 and self-locking Type LA4 fasteners provide load-bearing threads in stainless steel sheets as thin as .038” with hardness up to HRB 88 on the Rockwell “B” scale.
Many PEM Type AS and AC self-clinching floating fasteners correspond to sizes in US NASM45938/11 specifications. Check our web site for a complete Military Specification and National Aerospace Standards Reference Guide (Bulletin NASM). less
Unit of Measure
Thread Size |
N/A .250-20 (1/4-20) |
Thread Type |
N/A
Non-Locking
Loading zoom |
Thread Code |
N/A 0420 |
Shank Code |
N/A 2 |
A (Shank) Max. |
N/A
.054 in
Loading zoom |
Min. Sheet Thickness |
N/A .054 in |
Hole Size in Sheet + .003 - .000 |
N/A .515 in |
C Max. |
N/A .514 in |
D Max. |
N/A .510 in |
E ± .015 |
N/A .600 in |
T1 Max. |
N/A .210 in |
Min. Dist. Hole C/L to Edge |
N/A .420 in |
Float |
N/A .015” minimum, in all directions from center, .030” total |
Fastener Material |
N/A 300 Series Stainless Steel |
Fastener Materials - Retainer |
N/A 300 Series Stainless Steel |
Fastener Materials - Nut |
N/A 300 Series Stainless Steel |
Standard Finish - Retainer & Nut |
N/A Passivated and/or tested per ASTM A380 |
For Use in Sheet Hardness1 | N/A HRB 70 / HB 125 or Less |
Thread Specification |
N/A Internal, ANSI B1.1, 2B |
CAD Supplier |
N/A PennEngineering® (PEM®) |
- 1 HRB - Hardness Rockwell “B” Scale. HB - Hardness Brinell.