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：锁紧螺母理工艺不当，止动垫电镀过程发生脆。

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.

上海锐拓五金现在主营紧固件螺母类产品： 铆螺母，尼龙锁紧螺母，焊接螺母，法兰螺母，以及各类汽车标准件。