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.

Standard English Sizes

Metric Sizes to DIN 470

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.

Standard English Sizes

Metric Sizes to DIN 470

Cupped 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.

Cupped Plugs and Cupped Plugs Pierced Catalog

Hubbard Plugs Pierced

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

Hubbard Plugs Pierced Catalog

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.

Standard English Sizes

Metric Sizes