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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

.271 - .331 in

Identification Mark

3 Rad.

B Ref.

.529 in
a1058.jpg

C Max.

.089 in

øD + .000 - .004

.332 in

E Max.

.382 in

F + .005 -.000

.054 in

J Ref.

.750 in

K Ref.

.435 in

Install Drill Size Ref.

Q

Install Hole Size Min.

.332 in

Install Hole Size Max.

.338 in

Pull Up Factor

.095 in

Weight per 1000

16.9 lb

Fastening

Installed

Thread Specification

3B per ASME B1.1

Standard Material

Low Carbon Steel

Standard Finish

Cadmium Plate - .0003” minimum thickness per SAE AMS-QQ-P-416 Class 2, Type II

CAD Supplier

PennEngineering® (Atlas®)