| 摘要 |
A tap for forming internal threads on the inner wall of a bore wherein the shank portion has a rupture location at the time of over torquing. The rupture location may be created by the junction of two shank parts having different sized cross sections, an internal cavity within the axial bore of the shank, opposing holes perpendicular to the longitudinal axis of the shank, the junction of two coaxial bores in the shank having different sized diameters, junction of two shank parts with one such part being of softer material than the other, or opposing notches formed on the exterior of the shank.
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