Now our company is majoring in nuts series: rivet nuts, blind rivet, insert nuts,nylon locknuts, welded nuts, flange nuts and other kinds of auto standard parts.

上拓五金现在主营紧固件系列中类产品： 铆，尼龙锁紧，接，法兰，以及各类汽车标准件。

The results show that the failure is mainly attributed to the inappropriate heat-treatment technology of the locking nut and the hydrogen brittlement from electroplating of the stopping pad.

构件失效主要原因是：锁紧热处理工艺不当，止动垫电镀过程发生氢脆。