螺栓帽 meaning in English

bolt nut

Bolted bonnet steel gate valves for the petroleum , petrochemical and allied industries
石油石化和相关工业用螺栓帽状钢闸阀
We specialize in wholesale supply of screws , bolts , nuts , pins , studs and things of similar kinds
我们专管批发生意，供应螺钉、螺栓、螺栓帽、别针、饰针等诸如此类的东西。
Bolted bonnet steel gate valves for the petroleum , petrochemical and allied industries iso 10434 : 2004 ; german version en iso 10434 : 2004
石油石油化学和相关工业用螺栓帽状钢闸阀