Hubbard, M. D., Spring Co., Inc. - Metric Expansion Plugs
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Metric Expansion Plugs
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Expansion Plugs

larger image 		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 ASTM#A176.
• Brass to ASTM#B36.
• Customer specific materials different than those listed above are commonly run.

Finish:

• Steel: provided plain finish with a light oil. Metric expansion plugs can be provided with a wide range of coatings: mechanical zinc (processed in house), electro-zinc, black oxide.
• Aluminum: provided plain finish. Aluminum plugs are washed in a light mineral spirit in order to remove any solvents or residue.
• Stainless Steel: Provided plain finish. Stainless Steel plugs are washed in a light mineral spirit in order to remove any solvents or residue. Stainless plugs can be passivated.
• Brass: provided plain finish. Brass plugs are washed in a light mineral spirit in order to remove any solvents or residue.


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Item #

Nominal O.D. -A (mm)

Diameter Limits (mm)

Spherical Radius R (mm)

Thickness (mm)

Material

List Price

HPM-3-S-64 3 3.04/2.96 2.8 .64 Steel QUOTE
HPM-3-A-64 3 3.04/2.96 2.8 .64 Aluminum QUOTE
HPM-3-B-64 3 3.04/2.96 2.8 .64 Brass QUOTE
HPM-3-S-81 3 3.04/2.96 2.8 .81 Steel QUOTE
HPM-4-A-56 4 4.04/3.96 4 .56 Aluminum QUOTE
HPM-4-A-64 4 4.04/3.96 4 .64 Aluminum QUOTE
HPM-4-S-124 4 4.04/3.96 4 1.24 Steel QUOTE
HPM-5-A-51 5 5.04/4.96 4.4 .51 Aluminum QUOTE
HPM-5-B-51 5 5.04/4.96 4.4 .51 Brass QUOTE
HPM-5-A-64 5 5.04/4.96 4.4 .64 Aluminum QUOTE
HPM-5-B-64 5 5.04/4.96 4.4 .64 Brass QUOTE
HPM-5-S-64 5 5.04/4.96 4.4 .64 Steel QUOTE
HPM-5-A-81 5 5.04/4.96 4.4 .81 Aluminum QUOTE
HPM-5-B-81 5 5.04/4.96 4.4 .81 Brass QUOTE
HPM-5-S-81 5 5.04/4.96 4.4 .81 Steel QUOTE
HPM-5-B-114 5 5.04/4.96 4.4 1.14 Brass QUOTE
HPM-5-S-124 5 5.04/4.96 4.4 1.24 Steel QUOTE
HPM-6-B-64 6 6.04/5.96 6 .64 Brass QUOTE
HPM-7-A-51 7 7.04/6.96 6 .51 Aluminum QUOTE
HPM-7-B-81 7 7.04/6.96 6 .81 Brass QUOTE
HPM-7-S-157 7 7.04/6.96 6 1.57 Steel QUOTE
HPM-8-B-64 8 8.06/7.94 6.8 .64 Brass QUOTE
HPM-8-A-81 8 8.06/7.94 6.8 .81 Aluminum QUOTE
HPM-8-B-81 8 8.06/7.94 6.8 .81 Brass QUOTE
HPM-8-S-81 8 8.06/7.94 6.8 .81 Steel QUOTE
  Results 1 - 25 of 99 1 2 3 4 

M.D. Hubbard Spring Company  
595 S. Lapeer Rd., Box 425T • Oxford, MI 48371
Ph: 248-628-2528 • Fax: 248-628-7734

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