bolt和screw的区别? 7# i-seek-u bolt要和nut一起用 这可不一定哦。我见过有的阀门法兰上 螺栓孔为沉孔的,就用不着nut了 楼主自己也说过嘛“通常通过螺母来松/紧”.....“ a bolt is an externally threaded fastener designed for insertion through holes in assembled parts, and is normally intended to be tightened or released by torquing a nut.” “螺栓孔为沉孔的,就用不着nut”---这个能详细解释下吗? 查看更多