Screw, Nut, Bolt manufacturer / supplier in China, offering Metric Standard Class 8.8 Zinc Coating Grain Silo Bolts, Hex Flange Bolt with EPDM Washer and Grooves, Grain Bin Bolt W/O Nut Optional, Customize Grade 8 Zinc Coating Flange Bolt with Grooves, Class8.8 High Strength Hex Flange Bolt with Serration Head and Grooves and so on.