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SKU AC-440-2 Category Tag

Floating Self-Clinching Fasteners A4, AS, AC

Locking and Non-locking ThreadsThese 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).

34 in stock (can be backordered)

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Weight 1.09682 kg
Thread Code

Thread Size


Thread Specification

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Shank Code

Fastener Material

Fastener Materials – Nut

For Use in Sheet Hardness


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Product Category

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CAD Supplier


Thread Type


Fastener Characteristics

PEM Product Family

Product Type

Technology Type

Unit (Metric/Unified)

A Shank Max


E ± .015_in

Min. Sheet Thickness_in

C Max._in

D Max._in

T1 Max._in

Thread Code 440
Thread Size .112-40 (#4-40), #4-40
Thread Specification 2B, ANSI B1.1, Internal
Shank Code 2
Fastener Material 300 Series Stainless Steel
Fastener Materials – Nut 300 Series Stainless Steel
Fastener Materials – Retainer 300 Series Stainless Steel
Standard Finish – Retainer & Nut Passivated and/or tested per ASTM A380
For Use in Sheet Hardness HRB 70 / HB 125 or Less
Float .015” minimum, in all directions from center, .030” total
Product Category Floating Self-Clinching Fasteners A4, AS, AC
CAD Supplier PennEngineering® (PEM®)
CAD Part ID 103680
Thread Type Non-Locking
Brand PEM
Fastener Characteristics Floating
PEM Product Family ALA
Product Type Nuts
Technology Type Self-Clinching
Unit (Metric/Unified) Unified
A Shank Max .054in, 0.054in
E ± .015_IN .360in
Hole Size in Sheet + .003 – .000_IN .290in
Min. Dist. Hole C/L to Edge_IN .300in
Min. Sheet Thickness_IN .054in
C Max._IN .289in
D Max._IN .290in
T1 Max._IN .130in



Installation & Performance Data

AC, AS, LAS, LAC 440 1 5052-H34 Aluminum 1500 215 65
AC, AS, LAS, LAC 440 2 5052-H34 Aluminum 2000 225 80
AC, AS, LAS, LAC 440 1 Cold-Rolled Steel 3000 300 85
AC, AS, LAS, LAC 440 2 Cold-Rolled Steel 3000 300 150