Established in 2004,our factory-HaiNing ShuangMin Fasteners Co.,Ltd. certified by ISO9001:2008 has professional manufacturing experience in nuts and washers. As an certified manufacturer, kinds of fasteners are our outstanding goods include hex nuts, nylon insert lock nuts, slotted nuts, threaded rods, spring washers, etc. Becaues we own both cold and hot forge machine, we can produce the small size and big size hex nuts by ourself. For further information, please contact us at any time!!