| 摘要 |
The invention relates to fastening means of the known kind comprising a nut or bolthead and a spanner component, the nut or bolthead having a smooth edge surface and the spanner component having locating pins adapted to engage in cooperating bores in the nut or bolthead to rotate the nut or bolthead with the spanner component. Said fastening means are improved by providing (a) a sleeve which rotatably covers at least part of said edge surface and/or (b) an axial projection, preferably on the nut or bolthead, which is received as a rotatable fit in a recess, preferably in the spanner component, to restrict lateral movement between the nut or bolthead and the spanner component.
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