| 摘要 |
A bolt fastener of known kind for engagement in a socket is screwthreaded at its outer end, which protrudes for engagement with a nut. The fastener has a waisted portion, including a taper, towards the inner end of the fastener, the taper converging away from the inner end. The waisted portion is loosely surrounded by a collar with a slit along it. The collar grips the socket when the nut is tightened to withdraw the fastener relatively to the collar, the collar thereby being expanded by the taper. The present fastener is used wholly within the socket and, instead of being screwthreaded externally, has a bore which extends axially from the outer end and is screwthreaded for engagement with a headed bolt. The bore can be blind and not reach the waisted portion to avoid weakening it against tensile loading applied by the headed bolt; or be a through bore of stepped diameter and screwthreaded only beyond the waisted portion in the lesser diameter portion of the bore so that the fastener is subjected to axial compression when loaded by the bolt. A screwthreaded stud and nut can be used in place of the headed bolt. |
