PEM® PreTect™ thread masking plugs have been redesigned for improved thread protection during the paint or powder coating process. PreTect™ plugs are available for standard type self-clinching nuts in a variety of thread sizes and materials. Features include:

  • Fasteners are shipped with plugs already in place.
  • Plugs easily removed by end user with removal tool or with supplied removal tool.
  • Plugs can withstand 482˚F/250˚C temperatures.
Add the suffix “TP” to PEM® part number to order
fastener with pre-installed thread masking plug.


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You can search our website in different ways. You can search for inventory or product specifications using the full part number or partial part number. You don’t even need to type the words “inventory” or "product spec"!
Examples of what to type:
Full or partial part number: “S-632-1ZI”, “CLS 632” Type: “CLS”, “FH”, “SO” Website content: “Self-clinching Nuts” or “PEM studs”