| 摘要 |
There is disclosed a capped machine nut comprising a polygonal-sided metal nut body having a conical bearing surface projecting from a first axial end, the opposite axial end and the polygonal sides of the body being encased in a sheet metal cup-shaped cap tightly conforming to the polygonal nut body but spaced from said opposite axial end to form a dome. The nut body is formed with a peripheral groove axially intermediate the polygonal sides and conical bearing surface, wherein the shoulder of the groove adjacent the polygonal sides is substantially right-angled so that the lip of the cap skirt can effectively grip the shoulder when crimped into the groove, and thereby retain the cap on the nut body. In a preferred form, the lip of the cap skirt is doubly crimped by folding the skirt edge into the groove at the apices of the polygonal sides, and also intermediate the polygonal apices.
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