About us

NingBo YiShan Hardware Co.,LTD offers the DURA TUFF Flat Thread Rolling Dies for machine screws and self tapping screws with world class quality and production output. We have specialized in Flat Die Thread Rolling and knurling since 1963.The reason we have gained our solid reputation in the fastener industry because of the good performance, high quality, and best service. DURATUFF is known for its precision and quality for more than 20 years. DURATUFF dies are being designed, manufactured and controlled under most modernized and sophisticated systems. Company is also equipped with design and development of dies for different type of screws according to customer’s requirement or sample component as it has the world class system.

Our highly skilled die makers and thread engineers use the latest technologies to produce the kind of dies you want. Dies which last longer and produce better threads and more parts. Dies which can be changed easily with minimum machine down-time. So our top-performance dies are competitively lower in cost than comparable dies. Since they are virtually custom-built to your own requirements, you need not settle for more or less than you need. As specialists in the design and manufacturing of flat thread rolling dies, look to National to reduce your rolling costs.