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SKU AC-M3-2 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 0.76mm 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 0.97mm 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).

11 in stock (can be backordered)

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Weight 1.02227 kg
Thread Code

Thread Size

Thread Size X Pitch

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 ± 0.38_mm

Hole Size in Sheet + 0.08_mm

Min. Sheet Thickness_mm

C Max._mm

D Max._mm

T1 Max._mm

Thread Code M3
Thread Size M3 x 0.5
Thread Specification 6H, ANSI/ASME B1.13M, 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 0.38mm minimum, in all directions from center, 0.76mm total
Product Category Floating Self-Clinching Fasteners A4, AS, AC
CAD Supplier PennEngineering® (PEM®)
CAD Part ID 103681
Thread Type Non-Locking
Brand PEM
Fastener Characteristics Floating
PEM Product Family ALA
Product Type Nuts
Technology Type Self-Clinching
Unit (Metric/Unified) Metric
A Shank Max 1.38mm
E ± 0.38_MM 9.14mm
Hole Size in Sheet + 0.08_MM 7.37mm
Min. Dist. Hole C/L to Edge_MM 7.62mm
Min. Sheet Thickness_MM 1.38mm
C Max._MM 7.35mm
D Max._MM 7.37mm
T1 Max._MM 3.31mm



Installation & Performance Data

AC, AS, LAS, LAC M3 1 5052-H34 Aluminum 6.7 956 7.3
AC, AS, LAS, LAC M3 2 5052-H34 Aluminum 8.9 1000 9
AC, AS, LAS, LAC M3 1 Cold-Rolled Steel 13.3 1334 9.6
AC, AS, LAS, LAC M3 2 Cold-Rolled Steel 13.3 1334 16.9