... ,6.8,8.8,9.8... ..... Copper MACHINE SCREW, brass shoulder bolt screw ,BRASS ALLEN SCREW. ... screw;Type "M","UNC","UNF","BSW"threads for Machine threads.Head typesHexagon head,Mushroom head,Pan head ... in screw,bolt,nut,washer,rivet, stud, pin,wrench and so on .2. Our company had ... Almost each year ISO Quality person come into factory for Supervising inspecting. "integrity, in accordance with the national ...