... 2.Standard:ASTM A194 2H 3.Materials: Carbon steel and Alloy Steel Heavy Hex Nuts ASTM A194 2H Specifications:1. ... Material:Carbon steel or alloy steel;4.Surface finishes: plain, black oxygenation,black phosphated,zinc-plated,etc. ;5.Usage: steel structures,such ... as multi-floor&high-rise steel structure buildings,industrial buildings,high way,railway ...