Importance

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Abstract

A self-piercing rivet (10) for forming joints in stacked sheets of high or low strength, light alloy metals such as aluminium and magnesium. The rivet (10) comprises a head (11) and a substantially cylindrical shank (12) that is at least partially hollow so as to define a bore (13) that extends along at least part of its length. The outside diameter (D1) of the shank (12) is at least 6 mm, the effective length of the rivet is at least 1.3 times the diameter of the shank and the bore (13) has a volume that is at least 38% of the effective solid volume of the rivet (10). The rivet geometry is such that it has enhanced column strength to withstand the high insertion forces required and a high bore volume to accommodate displaced sheet material.

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First Claim