Tangshan Longquan Machinery Co., Ltd. is a joint-stock enterprise specializing in production of truck parts integrated with research, design, manufacturing and sales. Main products are fifth wheels, kingpins, suspension systems, mounting plates and other critical parts and components. The company is one of the earliest manufacturers mastering manufacturing technology of fifth wheel in China market. In 2004, the company has passed the international quality system certification ISO9001:2000, and the vehicle professional TS16949:2000 is certified in 2010 and Emark in 2016.

Now as China No.1 fifth wheels provider, Longquan supplys around 150,000 pcs annually to all China TOP10 truck manufacturers and takes approximately 25% of the complete tractor trucks market share. The company always takes the world lowest service rate as target, and leads the China fifth wheels new technology as criterion.