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All Categories > PEM® Brand Fasteners for Metal Sheets and Panels > Nuts for Sheet Metal > Floating Nuts – Types A4, AS, AC, LA4, LAC, LAS > Floating self-clinching, locking thread fasteners LA4, LAC, LAS > Floating self-clinching, locking thread fasteners LA4, LAC, LAS - Unified > Part # LAC-0420-2MD  

Part # LAC-0420-2MD, Floating self-clinching, locking thread fasteners LA4, LAC, LAS - Unified

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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 the 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).




 Specifications   

Thread Size
.250-20 (1/4-20)

Thread Type
Self-Locking

Thread Code
0420

Shank Code
2

A (Shank) Max.

 View
.054 in

Min. Sheet Thickness
.054 in

Hole Size in Sheet + .003 - .000
.515 in

C Max.
.514 in

D Max.
.510 in

E ± .015
.600 in

T2 Max.
.310 in

Min. Dist. Hole C/L to Edge
.420 in

Float
.015” minimum, in all directions from center, .030” total

Fastener Material
300 Series Stainless Steel

Fastener Materials - Retainer
300 Series Stainless Steel

Fastener Materials - Nut
300 Series Stainless Steel

Retainer Finish
Passivated and/or tested per ASTM A380

Nut Finish
Black Dry-film Lubricant

For Use in Sheet Hardness1
HRB 70 / HB 125 or Less

Thread Specification
Internal, ANSI B1.1, 2B

CAD Supplier
PennEngineering® (PEM®)
1 HRB - Hardness Rockwell “B” Scale. HB - Hardness Brinell.


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