China heavy hex manufacturers
China heavy hex manufacturers ASTM A490 METRIC HEAVY HEX BOLTS ITEM: STANDARD SPECIFICATION FOR HIGH-STRENGTH STEEL BOLTS,CLASSES 10.9 , FOR STRUCTURAL STEEL JOINTS [METRIC] MATERIAL: MEDIUM CARBON ALLOY STEEL DIMENSION: ASME B18.2.3.7M HEAVY HEX STRUCTURAL BOLTS FINISHING: BLACK HOT DIP G
