Hongkong Hhongyu Metal Co., Ltd is a fastener manufacturer in China, specializing in manufacturing washers(standard washers, special washers) and stamping parts. It was founded in 1994with much exeperience in exporting in exportiing washers and stampings to the world by its trade company--Qingdao DukYang Trade Co., Ltd. The standard washers include:Flat washers, square washers, spring washers, lock washers, taper washers and so on, in accordance with DIN125, 126, 433, 440, 1440, 1441, 6916, 7349, 7989, BS4320, USS, SAE, F/W, NFE25513, etc. We will supply you with high quality products and services.