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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 .020 - .080

Identification Mark

 N/A Blank

B ± .015

 N/A .475
 a1060.jpg

C Nom.

 N/A .058

øD + .000 - .004

 N/A .332

E Max.

 N/A .382

F + .005 -.000

 N/A .054

G Max.

 N/A .035

L ± .015

 N/A .937

K Ref.

 N/A .440

P - Keyway Width + .003 -.000

 N/A .062

H - Keyway Height

 N/A .056 - .058

Install Drill Size Ref.

 N/A Q

Install Hole Size Min.

 N/A .332

Install Hole Size Max.

 N/A .338

Pull Up Factor

 N/A .095

Weight per 1000

 N/A 10

Fastening

 N/A Uninstalled

Thread Specification

 N/A 3B per ASME B1.1

Standard Material

 N/A Alloy No. 260 Brass

Standard Finish

 N/A None - bright as machined

CAD Supplier

 N/A PennEngineering® (Atlas®)