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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

N/A 1/4-20

Grip Range

N/A .260 - .320 in

Identification Mark

N/A 4 Rad.

B ± .015

N/A .475 in a1060.jpg

C Nom.

N/A .058 in

øD + .000 - .004

N/A .332 in

E Max.

N/A .382 in

F + .005 -.000

N/A .054 in

L ± .015

N/A 1.187 in

K Ref.

N/A .445 in

Install Drill Size Ref.

N/A Q

Install Hole Size Min.

N/A .332 in

Install Hole Size Max.

N/A .338 in

Pull Up Factor

N/A .095 in

Weight per 1000

N/A 12.0 lb

Fastening

N/A Uninstalled

Thread Specification

N/A 3B per ASME B1.1

Standard Material

N/A 4037 Alloy Steel

Standard Finish

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

CAD Supplier

N/A PennEngineering® (Atlas®)