Concave Bottom Cup-Type Expansion Plugs seal by pressure exerted by the concave bottom against the walls of the plug. They are made standard from Carbon Steel and are available in 24 sizes, ranging from 3/8" - 3" in Nominal Diameter. (Brass, Aluminum and Galvanized Steel are also available. Please contact EFC International directly for information).
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Concave Bottom Cup-Type Expansion Plugs

0.381 Inch (in) Maximum Hole Size Concave Bottom Cup-Type Expansion Plug
Concave Bottom Cup-Type Expansion Plugs

0.442 Inch (in) Maximum Hole Size Concave Bottom Cup-Type Expansion Plug
Concave Bottom Cup-Type Expansion Plugs

0.506 Inch (in) Maximum Hole Size Concave Bottom Cup-Type Expansion Plug
Concave Bottom Cup-Type Expansion Plugs

0.568 Inch (in) Maximum Hole Size Concave Bottom Cup-Type Expansion Plug
Concave Bottom Cup-Type Expansion Plugs

0.631 Inch (in) Maximum Hole Size Concave Bottom Cup-Type Expansion Plug
Description N/A Concave Bottom Cup-Type Expansion Plugs seal by pressure exerted by the concave bottom against the walls of the plug. They are made standard from Carbon Steel and are available in 24 sizes, ranging from 3/8" - 3" in Nominal Diameter. (Brass, Aluminum and Galvanized Steel are also available. Please contact EFC International directly for information).
Material N/A Heavy Duty Galvanized Steel
Finish N/A G90
Maximum Crown Height N/A 0.075 in
Minimum Crown Height N/A 0.049 in
Maximum Hole Diameter N/A 0.381 in N/A 0.442 in N/A 0.506 in N/A 0.568 in N/A 0.631 in
Minimum Hole Diameter N/A 0.379 in N/A 0.44 in N/A 0.504 in N/A 0.566 in N/A 0.629 in
Nominal Diameter (Decimal) N/A 0.375 in N/A 0.437 in N/A 0.5 in N/A 0.562 in N/A 0.625 in
Maximum Overall Height N/A 0.208 in N/A 0.208 in N/A 0.27 in N/A 0.27 in N/A 0.27 in
Minimum Overall Height N/A 0.168 in N/A 0.168 in N/A 0.23 in N/A 0.23 in N/A 0.23 in
Maximum Outside Diameter N/A 0.387 in N/A 0.449 in N/A 0.512 in N/A 0.574 in N/A 0.637 in
Minimum Outside Diameter N/A 0.385 in N/A 0.447 in N/A 0.51 in N/A 0.572 in N/A 0.635 in
Steel Thickness N/A 0.042 in
Features and Benefits N/A For insertion, they should be driven on the inside bottom radius, and not from the top rim of the cup. The driving arbor should be 0.015/0.025" smaller than the ID of the plug, with a flat bottom to prevent contact with the concave bottom to prevent deforming this surface.
Concave Bottom
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