China special bolt factory CURVED TUNNEL BOLTS ITEM: CURVED TUNNEL BOLTS FOR SUBWAY AND METRO MATERIAL: BOTH LOW CARBON AND MEDIUM CARBON STEEL DIMENSION: ANSI/ASME B18.2.1 HEX BOLTS AND SCREWS FINISHING: BLACK ZINC PLATED YELLOW ZINC PLATED HOT DIP GALVANIZED Material Carbon steel,alloy steel etcners bolts for highway fence SizeM24-M48 or as requiredstud rail track bolts with nuts and washer FinishZinc plated( White, Blue),Black Oxide, Dacroment, etc Grade4.8/6.8/8.8/10.9/12.9 StandardDIN,GB,ISO etc AdvantagesOne-stop shopping; http://www.hualongfasteners.com/special-bolts/
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