Dongguan City, Xu-feng Hardware Products Factory is a professional manufacturer of metal springs, lathe parts and stamping parts of the enterprise, the factory has advanced technology and equipment, modern factories and professional spring, selling products around the world. Purpose: The following spring washer means to prevent the nut nut loose. In the national standards have described. Hexagon slotted screw nut is designed for the end of the bolt holes used in conjunction in order to insert the cotter pin from the nut of the screw holes in the tank, to prevent automatic return pine nut spring steel, mainly used with a vibration load or alternating load occasions. Prevent the mechanical design, fabrication nut (or bolt) automatic back loose methods are: 1. Padded spring washer; (easy to do) with a hex slotted nuts + 2 cotter pin; (an increase of the processing step) 3. . Padded washers; (an increase of the processing step) 4 hexagon head hex bolts inserted steel wire openings. (An increase of machining process) may need to contact me, oh! ! Dongguan Xu-feng Hardware Spring Factory is a professional production of metal springs, lathe parts and stamping parts of the enterprise, with Japan imported computer universal spring machine, computer spring machine, extension spring, torsion spring machines, CNC lathes, grinders size presses and other machines more than 120 sets of precision, a large South Korean KOS, KIS, Daxin, Japan, fine lines, Suzuki stainless steel wire (SUS301, SUS302, SUS304, SUS316), piano wire (SWPA, SPWB), spring steel wire ( SWC, 65MN, 60Si2MnA), copper materials and other imported materials, and has a dynamometer, projectors, grinding machine, shot blasting machine, salt spray test machine detector. Dongguan Xu-feng metal spring metal products factory springs, lathe parts and stampings are widely used in electronics, electrical appliances, automobiles, machinery, toys, jewelry, and other industries. The company of "honesty, quality and cheap, efficient service, innovation and development, mutual benefit and win-win; meet customer needs is our eternal pursuit of" business philosophy shaped springs to meet your needs. Quality products, good reputation, first-class services to meet your needs, welcome colleagues from home and abroad to negotiate business. _ _ Xufeng spring butterfly spring metal products factory provided by Dongguan City Xufeng Hardware Products Factory. Dongguan City, Xu-feng Hardware Products Factory (www.dglijing168.com) strong, credible, in Dongguan, Guangdong spring industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead Xufeng Hardware Factory and you work into the brilliant, for a better future!