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Part# PC-2750Z1
** This item has been discontinued by the manufacturer as there is not significant enough demand for this size. Once our existing stock is depleted, we will no longer supply this specific item.
2-3/4 In. Diameter Concave Expansion Plug
Carbon Steel, Zinc Plated Finish
2.762 In. Outside Diameter
0.41 In. Overall Height
2.750 - 2.754 In. Recommended Hole Size
These plugs seal by pressure exerted by the concave bottom against the walls of the plug, much in the same manner as a belleville washer. Concave bottom plugs should be driven on the inside bottom radius and not from the top rim of the cup. The driving arbor should be .015/.0125" smaller than the inside diameter of the plug, and have a contact radius of .062", with a flat bottom to prevent contact with the concave bottom to avoid deforming this surface.