| 摘要 |
An improved, one-piece, sheet metal fastener for threadably receiving and lockingly engaging an externally threaded fastener at relatively low clamping forces is provided. The improved fastener comprises a generally arcuate leg having members for engaging external threads formed therein. The arcuate leg, in the non-deformed position thereof, defines an arc section having a radius and a chord, the ratio of said radius to said chord being in the range of 1:1.4 to 1:1.8 and preferably in the range of 1:1.5 to 1:1.7.
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