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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

 1/4-20

Grip Range

 .020 - .080 in

Identification Mark

 Blank

B ± .015

 .475 in
a1060_1.jpg

C Nom.

 .058 in

øD + .000 - .004

 .332 in

E Max.

 .382 in

F + .005 -.000

 .054 in
L ± .0151 .937 in

K Ref.

 .440 in

Install Drill Size Ref.

 Q

Install Hole Size Min.

 .332 in

Install Hole Size Max.

 .338 in

Pull Up Factor

 .095 in

Weight per 1000

 10 lb

Fastening

 Uninstalled

Thread Specification

 3B per ASME B1.1

Standard Material

 Alloy No. 260 Brass

Standard Finish

 None - bright as machined

CAD Supplier

 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”