We are SHANGHAI TONGHUI MECHANICAL CO., LTD is the key mechanical products manufacturer in china.

We passed ISO9001: 2000 quality management systerm. Low price, High quality & new designs, with more than 15 years experience for production.

Our products as follows:
self-drilling screw
self-tapping scre
Drywall screw
Chipboard screw
Wood screw
Machine screw
Galvanized roofing bolts
Concrete screws
Window screw
Washer
Flat washer
Spring lock washer
Nut
Hex nuts
Nylon lock nuts, Flange nuts, Cap nuts
Wing nuts, Spring nuts, Hex long nuts
Bolts
Hex head bolts[DIN933, DIN931, DIN912
Carriage bolt DIN603
Flat eye bolt, Hex flange head bolt
Thread rods, 4.8 grade, 8.8 grade, 10.9 grade, 12.9 grade
Precision spring, die spring, disc spring, mechanical spring, disc spring and so on.