Black Hot Dip Galvanized Heavy Hex Nuts

Size 7/8"-9 (7/8-inch nominal, 9 TPI UNC thread) suits large structural bolts commonly used in steel building frames, truss connections, bridge girder splices, and heavy equipment anchor frames. The combination of Black oxide treatment and HDG galvanizing provides a multi-layer protective system — the black oxide offering an inner layer that improves adhesion, with the hot-dip zinc providing the primary corrosion protection layer.

45# carbon steel construction delivers high strength appropriate for structural load-bearing connections, with the HDG coating ensuring long service life in outdoor, coastal, and industrial atmospheric environments. Available in Grade 8.8, 10.9, and equivalent ASTM A194 grades.

Compliant with GB/T 1229, ASTM A194, ASME B18.2.2, and HG/T 20634. OEM/ODM customization supported.