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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

 N/A .313-18 (5/16-18)

Thread Code

 N/A 0518

Shank Code

 N/A 3

A (Shank) Max.

 N/A .120 in Self-Clinching-Nuts---Types-S--SS--CLS--CLSS--SP-2.png

Plug Material

 N/A Black Silicone Rubber

High Temperature Resistant

 N/A 482 ºF250 ºC

Plug Hardness

 N/A Shore a 70
Rec. Min. Sheet Thickness1 N/A .125 in

Hole Size in Sheet + .003 - .000

 N/A .413 in

C Max.

 N/A .412 in

E ± .010

 N/A .500 in

T ± .010

 N/A .230 in

PD

 N/A 0.275 in

PL

 N/A 0.003 in
Min. Dist. Hole C/L to Edge2 N/A .38 in
For Use in Sheet Hardness3 N/A HRB 80 / HB 150 or less

Thread Specification

 N/A Internal, ASME B1.1, 2B

Fastener Material

 N/A Heat-Treated Carbon Steel

Standard Finish

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

CAD Supplier

 N/A 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.