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ASTM A194 2h Tuerca 3/8"Carbon Steel Heavy Hex Nut HDG for Photovoltaic Solar Panel Fastener Manufacturer with in-House Lab, Find Details and Price about 2h Nut Nuts Fasteners from ASTM A194 2h Tuerca 3/8"Carbon Steel Heavy Hex Nut HDG for Photovoltaic Solar Panel Fastener Manufacturer with in-House Lab - Sanma Fastener (Zhejiang) Co., Ltd