Climax steel and aluminum collars and couplings are supplied with steel screws. Stainless steel collars and couplings as well as all non-metallic collars are supplied with stainless steel screws.
Steel, Set Screw….Hex Socket, Cup Point, 3A Thread, ASTM F912
Steel, Cap Screw…. Hex Socket, 3A Thread, ASTM A574
Stainless Steel, Set Screw….Hex Socket, Cup Point, 3A Thread ASTM F880
Stainless Steel, Cap Screw….Hex, Socket, 3A Thread, ASTM F837