SANYU MACHINE is situated at the shore of East China Sea—Yuhuan of Zhejiang Province, a remarkable place produces outstanding people, with beautiful scenery and very convenient transportation.
      The factory was established in 1981, with 20 years' development and efforts, it has had rich technical force, fine equipments and strict quality guarantee system. It is an appointed manufacturer that specializes in various kinds of ball joint assembly for car automatic door, ball joint assembly for car underpan, ball joint assembly for agricultural truck, ball joint assembly for mini-car underpan, ball joint assembly for shift pole and hardware standard accessories. 

he whole leading rank has strong quality market consciousness, guides the whole staff to insist on the quality policy of “science and technology for the leading, quality for the masterstroke”. In 2001 the enterprise was approved the international quality authentication of ISO9001：2000. The quality of the products has reached the advanced product level among the same trade at home and abroad; the products are received good comments from domestic & international brand automatic door car and automobile manufacturers. 

The factory insists on “quality first, abiding by contract, satisfying the customers, and serving for consumers sincerely”; heartily hopes that our each product is your only choice. 

This manual is written on the base of the factory's production characteristic, according to GB/TL9001-2000 idt ISO9001: 2000 quality management system and united the production practice, it is the programmatic document of the quality system of our factory, is the regulation that every quality activity of our factory must be followed and is the basis of guaranteeing ability for external quality of our factory