Hollow Bolt,Stainless 1.ISO,ANSI,CE,JIS,DIN,BS& non-standard fastener supply 2. ... .8..... Hollow Bolt,Stainless Steel Hollow Bolt,Bolt with Internal Thread.1.What’s the specification of our Products ? MaterialsCarbon steel ... accordingto customer's demand .Threads/ScrowsType "M","UNC","UNF","BSW"thread are available. Head typesHexagon head,Mushroom head,Pan head,Countersunk ...