A3 Steel Nut Bolt Units Grinding Mill Liner Bolts Abrasion ...
Good Surface Quality After Shot Blasting. A3 Steel Nut Bolt Units Grinding Mill Liner Bolts Abrasion Resistant. Quick Details. 1. Bolt material:40Cr;. 2. Bolt strength:8.8 Grade;. 3. Nut material:A3 steel;.