| 摘要 |
A fastener that includes a head part having an internally threaded hole extending from one side of the head part to another side of the head part, an externally threaded shank in threaded engagement with the internally threaded hole of the head part, the shank being externally threaded for threaded engagement with a nut, and an externally threaded locking part in threaded engagement with the internally threaded hole of the head part, wherein the shank and the locking part are in contact with each other inside the threaded hole, such that the locking part resists against travel of the shank through the threaded hole.
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