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Zhejiang Sanma API Certified Nuts Fasteners Manufacturer ASTM A194 Heavy Hex Nut 2h/2hm Hex Head Nuts and Bolts Kits, Find Details and Price about 2h Nut Nuts Fasteners from Zhejiang Sanma API Certified Nuts Fasteners Manufacturer ASTM A194 Heavy Hex Nut 2h/2hm Hex Head Nuts and Bolts Kits - Sanma Fastener (Zhejiang) Co., Ltd