• Concave Bottom Cup-Type Expansion Plugs
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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Item #

Item Name

Maximum Hole Diameter

Minimum Hole Diameter

Nominal Diameter (Decimal)

N/A 0.381 Inch (in) Maximum Hole Size Concave Bottom Cup-Type Expansion Plug N/A 0.381 in N/A 0.379 in N/A 0.375 in
N/A 0.442 Inch (in) Maximum Hole Size Concave Bottom Cup-Type Expansion Plug N/A 0.442 in N/A 0.44 in N/A 0.437 in
N/A 0.506 Inch (in) Maximum Hole Size Concave Bottom Cup-Type Expansion Plug N/A 0.506 in N/A 0.504 in N/A 0.5 in
N/A 0.568 Inch (in) Maximum Hole Size Concave Bottom Cup-Type Expansion Plug N/A 0.568 in N/A 0.566 in N/A 0.562 in
N/A 0.631 Inch (in) Maximum Hole Size Concave Bottom Cup-Type Expansion Plug N/A 0.631 in N/A 0.629 in N/A 0.625 in
N/A 0.693 Inch (in) Maximum Hole Size Concave Bottom Cup-Type Expansion Plug N/A 0.693 in N/A 0.691 in N/A 0.687 in
N/A 0.756 Inch (in) Maximum Hole Size Concave Bottom Cup-Type Expansion Plug N/A 0.756 in N/A 0.754 in N/A 0.75 in
N/A 0.819 Inch (in) Maximum Hole Size Concave Bottom Cup-Type Expansion Plug N/A 0.819 in N/A 0.817 in N/A 0.812 in
N/A 0.881 Inch (in) Maximum Hole Size Concave Bottom Cup-Type Expansion Plug N/A 0.881 in N/A 0.879 in N/A 0.875 in
N/A 1.005 Inch (in) Maximum Hole Size Concave Bottom Cup-Type Expansion Plug N/A 1.005 in N/A 1.002 in N/A 1 in
N/A 1.067 Inch (in) Maximum Hole Size Concave Bottom Cup-Type Expansion Plug N/A 1.067 in N/A 1.064 in N/A 1.062 in
N/A 1.13 Inch (in) Maximum Hole Size Concave Bottom Cup-Type Expansion Plug N/A 1.13 in N/A 1.127 in N/A 1.125 in
N/A 1.255 Inch (in) Maximum Hole Size Concave Bottom Cup-Type Expansion Plug N/A 1.255 in N/A 1.252 in N/A 1.25 in
N/A 1.381 Inch (in) Maximum Hole Size Concave Bottom Cup-Type Expansion Plug N/A 1.381 in N/A 1.378 in N/A 1.375 in
N/A 1.5 Inch (in) Maximum Hole Size Concave Bottom Cup-Type Expansion Plug N/A 1.5 in N/A 1.497 in N/A 1.5 in
N/A 1.634 Inch (in) Maximum Hole Size Concave Bottom Cup-Type Expansion Plug N/A 1.634 in N/A 1.631 in N/A 1.625 in
N/A 1.634 Inch (in) Maximum Hole Size Concave Bottom Cup-Type Expansion Plug N/A 1.634 in N/A 1.631 in N/A 1.625 in
N/A 1.754 Inch (in) Maximum Hole Size Concave Bottom Cup-Type Expansion Plug N/A 1.754 in N/A 1.751 in N/A 1.75 in
N/A 1.879 Inch (in) Maximum Hole Size Concave Bottom Cup-Type Expansion Plug N/A 1.879 in N/A 1.876 in N/A 1.875 in
N/A 2.004 Inch (in) Maximum Hole Size Concave Bottom Cup-Type Expansion Plug N/A 2.004 in N/A 2.001 in N/A 2 in
N/A 2.004 Inch (in) Maximum Hole Size Concave Bottom Cup-Type Expansion Plug N/A 2.004 in N/A 2.001 in N/A 2 in
N/A 2.504 Inch (in) Maximum Hole Size Concave Bottom Cup-Type Expansion Plug N/A 2.504 in N/A 2.5 in N/A 2.5 in
N/A 2.754 Inch (in) Maximum Hole Size Concave Bottom Cup-Type Expansion Plug N/A 2.754 in N/A 2.75 in N/A 2.75 in
N/A 3.004 Inch (in) Maximum Hole Size Concave Bottom Cup-Type Expansion Plug N/A 3.004 in N/A 3 in N/A 3 in
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