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  • Press-fit insert provides strong, reusable threads. No heat or ultrasonics required.
  • Hexagonal “barbed” configuration ensures high torqueout and pullout values.
  • Aluminum inserts ideal for light weight designs.
  • Aluminum and stainless steel inserts offer lead-free alternative.
Unit of Measure

Thread Size

.250-20 (1/4-20)

Type

NFPC

Thread Code

0420

A Max.

.315 in
a1295.jpg

C Max.

.311 in

E Nom.

.312 in

Min. Sheet Thickness

.328 in

Hole Size in Sheet + .003 - .000

.312 in

Min. Boss Dia.

.750 in
Min. Depth Full Thread H1 .300 in

Thread Specification

2B per ASME B1.1

Standard Material

300 Series Stainless Steel

Standard Finish

Passivated and/or tested per ASTM A380

CAD Supplier

PennEngineering® (SI®)
  • 1 Thread tapped thru, Class 3A/4h screw must pass with finger torque, but basic go gauge may stop at pilot end.