Expansion Plugs

Hubbard (Welch Type) Expansion Plugs


  • Inexpensive, efficient, permanent method of closing/sealing manufactured holes in castings and other processes.
  • Perfect for limited space (depth) hole closure applications.


Hubbard Ground Expansion Plugs


  • The ground expansion plug offers the greatest level of holding power or leak resistance available in an expansion plug.
  • Ground Plugs, installed in a correctly prepared counter bore, should eliminate the need for sealer and should hold highly penetrating liquids.


Cupped Plugs, Cup Plugs, and Cupped Plugs Pierced


  • Inexpensive, efficient, permanent method of closing/sealing manufactured holes in castings and other processes.
  • Press / interference fit into a through hole – no counter bore required.


Hubbard Plugs Pierced


  • Used in applications where a hole needs to be constricted.


Combined Core Drill and Counter Bore


  • This advanced cutting tool design combines into one operation, instead of two, the preparation of shallow cored holes for insertion of Hubbard (Welch Type) Expansion Plugs.
  • Maximizes sealing effectiveness of Hubbard (Welch Type) Expansion Plugs and Ground Plugs.


Installation Recommendations – Welch Plug


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Installation Recommendations – Cupped Plug

Installation Recommendations - Cupped Plugs

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