In 1983, our company Haujoy started our production of piston ring, at that time became one of the earliest piston ring suppliers in China. Today, Haujoy is emphasizing in the production & R&D of Wave Spring, Wave Washer, Retaining Ring and accessories for gas engine. Haujoy company locates at the economic developing district in Zhangjiagang, north to the economic developing district alongside the Yangze River in Jiangsu Province, with convenience in information changing and logistic.Based on more than 20 years technical experience, Haujoy catches the tide in the world and successfully empolders following new items: Wave Spring and Retaining Ring. Our Wave Spring especially has its advantage in its special technics, low cost and high & steady quality. Currently we can supply severl series of production, xxxxx: different kinds of single-turn & crest to crest wave spring, retaining ring etc., which is widely used in machinery & equipment, chemical industry, electrical industry and national defence industry etc.