Hangzhou dingyuan metal washers co,.ltd located in hangzhou xiaoshan district which is famous for spring washers. Our company is very close to shanghai port&ningbo port,it bring us convenient transportaion. We are professional manufacturer in spring washers and flat washers,so we can supply you with spring washers and flat washers in different raw materials and surface treatments. The following is our products range: Name Standard Specification Material Spring washers ANSIB18-21.1K13 3/32(No.4)-2" Spring steel&stainless steel BS 1802 1/8"-2" JIS-2 M2-M52 DIN127B M3-M64 DIN7980 (AUS) As to request Special items Flat washers USS/SAE/F436 3/16"-2" Carbon steel&stainless steel DIN125AB/DIN9021 M3-M64 DIN6916 DIN440 BS4320 M5-M30 NFE25513/25514 As to request Special items Moreover,we also act as a distributor for other fasteners,such as bolt,nut,and thread rod,etc. If you are interested in our products,please contact with me freely,we will do our best to supply you high quality products with most competitive prices and fast delivery.