Ningbo Dahai Fastener Manufacturing Co., Ltd.
2 nd
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Contact:Bill Wang
Telephone: +86-574-86457949
Mobile Phone: +86-13566337385
Fax: +86-574-86457949
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High strength bolts with large hexagon head for steel structures

GB /T 1228-1991
material    Alloy Steel
Coating    black oxide coating

This product corresponds to the standard

GB /T 1228-1991