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AC-0420-2

SKU AC-0420-2 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).

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Weight 4.62455 kg
Thread Code

Thread Size

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Thread Specification

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Shank Code

Fastener Material

Fastener Materials – Nut

For Use in Sheet Hardness

Float

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Product Category

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CAD Supplier

CADPartID

Thread Type

Brand

Fastener Characteristics

PEM Product Family

Product Type

Technology Type

Unit (Metric/Unified)

A Shank Max

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E ± .015_in

Min. Sheet Thickness_in

C Max._in

D Max._in

T1 Max._in

THREAD CODE 0420
THREAD SIZE .250-20 (1/4-20), 1/4-20
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®)
CADPARTID 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 .600in
HOLE SIZE IN SHEET + .003 – .000_IN .515in
MIN. DIST. HOLE C/L TO EDGE_IN .420in
MIN. SHEET THICKNESS_IN .054in
C MAX._IN .514in
D MAX._IN .510in
T1 MAX._IN .210in

 

Resources

Installation & Performance Data

ala-a4-la4-metric
TYPE THREAD CODE TEST SHEET MATERIAL INSTALLATION (kN) RETAINER PUSHOUT (N) RETAINER TORQUE-OUT (N•m)
A4, LA4 M3 300 Series Stainless Steel 40 890 9.6
A4, LA4 M4 300 Series Stainless Steel 53 890 9.6
A4, LA4 M5 300 Series Stainless Steel 57 1100 14.1
ala-a4-la4-unified
TYPE THREAD CODE TEST SHEET MATERIAL INSTALLATION (lbs.) RETAINER PUSHOUT (lbs.) RETAINER TORQUE-OUT (in. lbs.)
A4, LA4 440 300 Series Stainless Steel 9000 200 85
A4, LA4 632 300 Series Stainless Steel 10000 200 85
A4, LA4 832 300 Series Stainless Steel 12000 200 85
A4, LA4 032 300 Series Stainless Steel 13000 250 125
ala-ac-as-las-lac-metric
TYPE THREAD CODE SHANK CODE TEST SHEET MATERIAL INSTALLATION (kN) RETAINER PUSHOUT (N) RETAINER TORQUE-OUT (N•m)
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 M4 1 5052-H34 Aluminum 8.9 1112 15.8
AC, AS, LAS, LAC M4 2 5052-H34 Aluminum 8.9 1178 16.9
AC, AS, LAS, LAC M5 1 5052-H34 Aluminum 8.9 1134 16.9
AC, AS, LAS, LAC M5 2 5052-H34 Aluminum 8.9 1556 19.7
AC, AS, LAS, LAC M6 2 5052-H34 Aluminum 13.3 1779 36.7
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
AC, AS, LAS, LAC M4 1 Cold-Rolled Steel 13.3 1334 16.9
AC, AS, LAS, LAC M4 2 Cold-Rolled Steel 13.3 1779 22.6
AC, AS, LAS, LAC M5 1 Cold-Rolled Steel 15.6 1779 16.9
AC, AS, LAS, LAC M5 2 Cold-Rolled Steel 15.6 2001 22.6
AC, AS, LAS, LAC M6 2 Cold-Rolled Steel 22.2 2224 36.7
ala-ac-as-las-lac-unified
TYPE THREAD CODE SHANK CODE TEST SHEET MATERIAL INSTALLATION (lbs.) RETAINER PUSHOUT (lbs.) RETAINER TORQUE-OUT (in. lbs.)
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 632 1 5052-H34 Aluminum 2000 240 140
AC, AS, LAS, LAC 632 2 5052-H34 Aluminum 2000 250 150
AC, AS, LAS, LAC 832 1 5052-H34 Aluminum 2000 250 140
AC, AS, LAS, LAC 832 2 5052-H34 Aluminum 2000 265 150
AC, AS, LAS, LAC 024 1
AC, AS, LAS, LAC 024 2
AC, AS, LAS, LAC 032 1 5052-H34 Aluminum 2000 300 150
AC, AS, LAS, LAC 032 2 5052-H34 Aluminum 2000 350 175
AC, AS, LAS, LAC 420 2 5052-H34 Aluminum 3000 400 325
AC, AS, LAS, LAC 428 2 5052-H34 Aluminum 3000 400 325
AC, AS, LAS, LAC 440 1 Cold-Rolled Steel 3000 300 85
AC, AS, LAS, LAC 440 2 Cold-Rolled Steel 3000 300 150
AC, AS, LAS, LAC 632 1 Cold-Rolled Steel 3000 300 150
AC, AS, LAS, LAC 632 2 Cold-Rolled Steel 3000 300 175
AC, AS, LAS, LAC 832 1 Cold-Rolled Steel 3000 300 150
AC, AS, LAS, LAC 832 2 Cold-Rolled Steel 3000 400 200
AC, AS, LAS, LAC 024 1
AC, AS, LAS, LAC 024 2
AC, AS, LAS, LAC 032 1 Cold-Rolled Steel 3500 400 150
AC, AS, LAS, LAC 032 2 Cold-Rolled Steel 3500 450 200
AC, AS, LAS, LAC 420 2 Cold-Rolled Steel 3000 500 325
AC, AS, LAS, LAC 428 2 Cold-Rolled Steel 3000 500 325