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Online literature contains the most current information available.
  • 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 .089 - .151 in

Identification Mark

N/A Blank

B Ref.

N/A .529 in a1058.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

J Ref.

N/A .750 in

K Ref.

N/A .435 in

P - Keyway Width + .003 -.000

N/A .062 in

H - Keyway Height

N/A .056 - .058 in

Install Drill Size Ref.


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 5.0 lb


N/A Installed

Thread Specification

N/A 3B per ASME B1.1

Standard Material

N/A 6053 Aluminum or 6061 Aluminum

Standard Finish

N/A Anodized in accordance with MIL-A-8625, Type II, Class 1 plus lubricant

CAD Supplier

N/A PennEngineering® (Atlas®)