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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 5/16-18

Grip Range

 N/A .256 - .331 in

Identification Mark

 N/A 2 Rad.

B Ref.

 N/A .656 in a1058.jpg

C Max.

 N/A .104 in

øD + .000 - .004

 N/A .413 in

E Max.

 N/A .505 in

F + .005 -.000

 N/A .120 in

J Ref.

 N/A .955 in

K Ref.

 N/A .550 in

P - Keyway Width + .003 -.000

 N/A .128 in

H - Keyway Height

 N/A .097 - .102 in

Install Drill Size Ref.

 N/A Z

Install Hole Size Min.

 N/A .413 in

Install Hole Size Max.

 N/A .423 in

Pull Up Factor

 N/A .120 in

Weight per 1000

 N/A 30.5 lb

Fastening

 N/A Installed

Thread Specification

 N/A 3B per ASME B1.1

Standard Material

 N/A Low Carbon 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®)