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All Categories > SI® Brand Insert for Plastics > Press-in Inserts > Hexagonal Inserts – Types NFPC, NFPA > Press-in Threaded Inserts, Hexagonal - Unified > Part # NFPA-0420  

Part # NFPA-0420, Press-in Threaded Inserts, Hexagonal - Unified

  • 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.


Thread Size

.250-20 (1/4-20)



Thread Code


A Max.

.315 in

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


Standard Finish


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.

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