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  • Designed for high load applications. Countersunk feature allow fastener to be installed flush with sheet surface.
  • Both UNC and UNF threads available in No. 10 and larger thread sizes. Check for availability of other grip ranges and designs.
Unit of Measure

Thread Size

1/4-20

Grip Range

.089 - .151 in

Identification Mark

Blank

A ± .015

.687 in

B Ref.

.529 in
a1058.jpg

C Max.

.089 in

øD + .000 - .004

.332 in

E Max.

.382 in

F + .005 -.000

.054 in

P - Keyway Width + .003 -.000

.062 in

H - Keyway Height

.056 - .058 in

Install Drill Size Ref.

Q

Install Hole Size Min.

.332 in

Install Hole Size Max.

.338 in

Pull Up Factor

.095 in

Weight

9.8 lb

Fastening

Uninstalled

Thread Specification

3B per ASME B1.1

Standard Material

430 Series Stainless Steel

Standard Finish

Passivated and/or tested per ASTM A380

CAD Supplier

PennEngineering® (Atlas®)