Hubbard (Welch Type) Expansion Plugs

  • Inexpensive, efficient, permanent method of closing/sealing manufactured holes in castings and other processes.
  • Hubbard (Welch Type) Expansion plugs are perfect for limited space (depth) hole closure applications.
  • Less expensive than cupped style plugs.
  • Require a counter bore for installation.
  • We have the widest range of sizes available anywhere – from 1/8” diameter up to 5-3/4″ diameter.

Expansion plugs with a ground edge are available for applications requiring an exceptional degree of holding power or leak resistance. We are the original patent holder and manufacturer of the Welch Expansion Plug since 1913.