Carbon Steel Fasteners, gr.4.8, gr.5.8, gr.6.8, gr.8.8, gr.10.8, gr.12.9, ASME B18.2.1 Hex Bolts ASME B18.2.2 Hex Nuts ASME B18.22.1, Stud Bolt, Hex Bolt, Hex Bolt with partial thread, Hex Bolt with full thread, Threaded Rod, U-bolt, hex socket cap screw skwork, hex nut, flat washer, washer washer./ - Zhengzhou Huitong Pipeline Equipment Co, Ltd.