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  • Designed for high load applications. Available with rib, key or full hex features for high torque applications.
  • 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

 .200 - .260 in

Identification Mark

 3 Rad.

B ± .015

 .475 in
a1060.jpg

C Nom.

 .058 in

øD + .000 - .004

 .332 in

E Max.

 .382 in

F + .005 -.000

 .054 in

G Max.

 .035 in

M Ref.

 .445 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 per 1000

 11.5 lb

Fastening

 Installed

Thread Specification

 3B per ASME B1.1

Standard Material

 4037 Alloy Steel

Standard Finish

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

CAD Supplier

 PennEngineering® (Atlas®)