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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

Specifications

Thread Size

1/4-20

Grip Range

.151 - .211 in

Identification Mark

1 Rad.

B Ref.

.529 in a1058.jpg

C Max.

.089 in

øD + .000 - .004

.332 in

E Max.

.382 in

F + .005 -.000

.054 in

L ± .015

1.062 in

K Ref.

.435 in

P - Keyway Width + .003 -.000

.062 in

H - Keyway Height

.056 - .058 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

16.3 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®)