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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 retainermore
Unit of Measure

Thread Size

.250-28 (1/4-28)

Thread Type

Self-Locking
a1369.jpg

Thread Code

0428

Shank Code

2

A (Shank) Max.

.054 in
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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

Steel

Fastener Materials - Retainer

Heat-Treated Carbon Steel

Fastener Materials - Nut

300 Series Stainless Steel

Retainer Finish

Zinc plated per ASTM B633, SC1 (5µm), Type III, colorless

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.