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PEM® PreTect™ Thread Masking Plugs reduce labor and protect threads from paint and powder coating processes. PreTect™ Thread Masking Plugs are available for standard type self-clinching nuts in variety of thread sizes and materials.

Features include:

  • Fasteners are shipped with plugs already in place.
  • Plugs easily removed by end user with fine tip tool.
  • Plugs can withstand 482°F/250°C temperatures
Unit of Measure

Thread Size

.250-20 (1/4-20)

Thread Code

0420

Shank Code

0

A (Shank) Max.

.045 in
Self-Clinching-Nuts---Types-S--SS--CLS--CLSS--SP-2.png

Plug Material

Black Silicone Rubber

High Temperature Resistant

482 ºF250 ºC

Plug Hardness

Shore a 70
Rec. Min. Sheet Thickness1 .047 in

Hole Size in Sheet + .003 - .000

.344 in

C Max.

.343 in

E ± .010

.440 in

T ± .010

.170 in

PD

0.216 in

PL

0.0764 in
Min. Dist. Hole C/L to Edge2 .34 in
For Use in Sheet Hardness3 HRB 80 / HB 150 or less

Thread Specification

Internal, ASME B1.1, 2B

Fastener Material

Heat-Treated Carbon Steel

Standard Finish

Zinc plated per ASTM B633, SC1 (5µm), Type III, colorless

CAD Supplier

PennEngineering® (PEM®)
  • 1 For maximum performance, we recommend that you use the maximum shank length for your sheet thickness.
  • 2 To minimize sheet distortion and maximize product performance, use a centerline-to-edge value greater or equal to the value specified.
  • 3 HRB - Hardness Rockwell “B” Scale. HB - Hardness Brinell.