... in automobiles,machinery,sports apparatus,trampolines and other appliances 3) Main material: 65manganese steel,stainless steel,or ... Go thorugh TS16949,ISO14001,OHSAS18001XIAMEN HONGSHENG - HARDWARE SPRING CO.,LTD. has been manufacturing Technical Springs since 2004. ... of the products. XIAMEN HONGSHENG - HARDWARE SPRING CO.,LTD. manufactures high precision springs laying emphasis on functionality ...