| 摘要 |
A press-fitted nut, or like screw-threaded fastening member such as a bolt-head, of the kind comprising a body with base projections and a crown with conical sectors, to engage in the wall of a mounting bore, has the base projections and conical sectors staggered angularly and spaced apart axially so as to form, in effect, a circumferential groove around the nut.
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