Hollow Bolt,Stainless 1.ISO,ANSI,CE,JIS,DIN,BS& non- ... 4.8 ,6.8,8.8,9.8..... Hollow Bolt,Stainless Steel Hollow Bolt,Bolt with Internal Thread.1.What’s ... the specification of our Products ? MaterialsCarbon steel,Stainless steel,Alloy ... ,1039,40ACR...Alloy steel are 35,40CrMo,SCM435,10B38...Stainless steel is SS201,202,302,304,316...copper is ...