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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

 N/A 1/4-20

Grip Range

 N/A .391 - .451 in

Identification Mark

 N/A 5 Rad.

B Ref.

 N/A .529 in a1058_1.jpg

C Max.

 N/A .089 in

øD + .000 - .004

 N/A .332 in

E Max.

 N/A .382 in

F + .005 -.000

 N/A .054 in
L ± .0151 N/A 1.312 in

K Ref.

 N/A .445 in

P - Keyway Width + .003 -.000

 N/A .062 in

H - Keyway Height

 N/A .056 - .058 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 18.1 lb

Fastening

 N/A Uninstalled

Thread Specification

 N/A 3B per ASME B1.1

Standard Material

 N/A 300 Series Stainless Steel

Standard Finish

 N/A Passivated and/or tested per ASTM A380

CAD Supplier

 N/A PennEngineering® (Atlas®)
  • 1 The “L” dimension is the height of the installed stud at max grip. The height of the stud will increase if it is installed into thinner material. To calculate “actual L” use this formula: max grip - actual grip + L = “actual L”