... ), JISB1186 AS1252Grade:8.8S, 10.9S , Size:M12-M36 Material:Carbon Steel,Alloy Steel 1> Description: High strength bolt, tension ... other friction-link project. I bolt steel companies choosing the material quality, production, advanced technology, reliable quality, low price Steel ... Standard: GB/T 1228-1231,ASTM A325 A490 A325M A490M1- Raw material : 40Cr,35Crmo2-Surface hardness: HRC:34-38,38-42,only ...