• 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.

Thread Size

 1/4-20

Identification Mark

 3 Rad.

Install Drill Size Ref.

 Q

Fastening

 Installed

Thread Specification

 3B per ASME B1.1

Standard Material

 Low Carbon Steel

Standard Finish

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

CAD Supplier

 PennEngineering® (Atlas®)