PennEngineering - Floating Self-Clinching Fasteners A4, AS, AC - Metric

Locking and Non-locking Threads
These 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).

Floating Self-Clinching Fasteners - Types A4, AS, AC 2

Unit of Measure

Items	AS-M3-1ZI Floating Self-Clinching Fasteners A4, AS, AC - Metric	AS-M4-1ZI Floating Self-Clinching Fasteners A4, AS, AC - Metric	AS-M5-1ZI Floating Self-Clinching Fasteners A4, AS, AC - Metric	AS-M3-2ZI Floating Self-Clinching Fasteners A4, AS, AC - Metric	AS-M4-2ZI Floating Self-Clinching Fasteners A4, AS, AC - Metric
Thread Size x Pitch	N/A M3 x 0.5	N/A M4 x 0.7	N/A M5 x 0.8	N/A M3 x 0.5	N/A M4 x 0.7
Thread Type	N/A Non-Locking
Thread Code	N/A M3	N/A M4	N/A M5	N/A M3	N/A M4
Shank Code	N/A 1	N/A 1	N/A 1	N/A 2	N/A 2
A (Shank) Max.	N/A 0.97 mm	N/A 0.97 mm	N/A 0.97 mm	N/A 1.38 mm	N/A 1.38 mm
Min. Sheet Thickness	N/A 0.97 mm	N/A 0.97 mm	N/A 0.97 mm	N/A 1.38 mm	N/A 1.38 mm
Hole Size in Sheet + 0.08	N/A 7.37 mm	N/A 9.35 mm	N/A 10.31 mm	N/A 7.37 mm	N/A 9.35 mm
C Max.	N/A 7.35 mm	N/A 9.33 mm	N/A 10.29 mm	N/A 7.35 mm	N/A 9.33 mm
D Max.	N/A 7.37 mm	N/A 9.28 mm	N/A 10.29 mm	N/A 7.37 mm	N/A 9.28 mm
E ± 0.38	N/A 9.14 mm	N/A 11.18 mm	N/A 11.94 mm	N/A 9.14 mm	N/A 11.18 mm
T1 Max.	N/A 3.31 mm	N/A 3.31 mm	N/A 4.32 mm	N/A 3.31 mm	N/A 3.31 mm
Min. Dist. Hole C/L to Edge	N/A 7.62 mm	N/A 8.64 mm	N/A 9.14 mm	N/A 7.62 mm	N/A 8.64 mm
Float	N/A 0.38mm minimum, in all directions from center, 0.76mm total
Fastener Material	N/A Steel
Fastener Materials - Retainer	N/A Heat-Treated Carbon Steel
Fastener Materials - Nut	N/A Carbon Steel
Standard Finish - Retainer & Nut	N/A Zinc plated per ASTM B633, SC1 (5µm), Type III, colorless
For Use in Sheet Hardness¹	N/A HRB 70 / HB 125 or Less
Thread Specification	N/A Internal, ANSI/ASME B1.13M, 6H
CAD Supplier	N/A PennEngineering® (PEM®)
¹ HRB - Hardness Rockwell “B” Scale. HB - Hardness Brinell.