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Original patent holder and manufacturer of the Welch Expansion Plug since 1913, M.D. Hubbard offers the widest range of sizes anywhere -- from 1/8"diameter up to 6"diameter. Expansion plugs and cupped plugs are an inexpensive, efficient, permanent method of closing/sealing manufactured holes in casting and other processes. Expansion plugs with a ground edge are available for applications requiring an exceptional degree of holding power or leak resistance.
Standard Materials:
• Steel: SAE1008/1010 low carbon steels ASTM#A1089 or A569 depending on gage.
• Aluminum: 1100H14 to ASTM#B209.
• Stainless Steel: type 302 to ASTM#A177 or type 430 to ASTM#A176.
• Brass to ASTM#B36.
• Customer specific ...
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Original patent holder and manufacturer of the Welch Metric Expansion Plug since 1913, M.D. Hubbard offers the widest range of sizes anywhere -- from 3mm diameter up to 48mm diameter (larger sizes may be available). Metric expansion plugs and cupped plugs are an inexpensive, efficient, permanent method of closing/sealing manufactured holes in casting and other processes. Metric expansion plugs with a ground edge are available for applications requiring an exceptional degree of holding power or leak resistance.
Standard Materials:
• Steel: SAE1008/1010 low carbon steels ASTM#A1089 or A569 depending on gage.
• Aluminum: 1100H14 to ASTM#B209.
• Stainless Steel: type 302 to ASTM#A177 or type 430 to ...
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The ground expansion plug offers the greatest level of holding power or leak resistance available in an expansion plug. The ground edge provides maximum contact surface area and the finest surface finish.
To maximize effect, the counter bore should receive special finishing.
A second operation on the hole and a ground finish on the edge of a Hubbard Plug will produce the maximum effectiveness possible.
We grind the edge circumferentially to a high finish, and segregate the parts when packing to prevent damage to the edge during shipment. For greatest protection ground edge Hubbard Plugs should be kept in their packing containers up to the point of assembly.
Ground Plugs, installed in a correctly prepared counter bore, ...
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Cupped plugs are an inexpensive, efficient, permanent method of closing/sealing manufactured holes.
Cupped plugs do not require a counter bore to seat against.
May be used under higher pressure applications than a Welch plug depending on application.
Standard Materials:
• Steel: SAE 1008/1010 low carbon steel to ASTM#A109
• Aluminum: 1100H14 to ASTM#B209
• Brass to ASTM#B36
• Stainless Steel: type 302 to ASTM#A177
• Customer specific materials different than those listed above are commonly run.
Finish:
• Steel: Provided plain finish with a light oil. Cupped plugs can be provided with a wide range of coatings: mechanical zinc (processed in house), electro-zinc, black ...
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Used in applications where a hole needs to be constricted, over a shaft to seal a bearing housing, etc.
Standard Materials:
• Steel: SAE 1008/1010 low carbon steel to ASTM#A109.
• Aluminum: 1100H14 to ASTM#B209.
• Brass to ASTM#B36.
• Stainless Steel: type 302 to ASTM#A177.
• Customer specific materials different than those listed above are commonly run.
Finish:
• Steel: Expansion plugs can be provided with a wide range of coatings: mechanical zinc (processed in house), electro-zinc, black oxide.
• Aluminum: Provided plain finish. Stainless plugs can be passivated.
• Brass: Provided plain finish.
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Cupped plugs with drawn inside or outside center projections.
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