Shanghai Jian & Mei is a pofessional manufacturer of high strength sutd bolt , thread rods and high strength nuts more than 8 years.These products are mainly applied in Oil & Gas line.They are include: Stud Bolt / rod, Heavy Hex Nut, F436 Flat washer etc. We could manufacture the size from 1/2” to 4”, from M5 to M64; Length from 50mm to 6m.