Ningbo Yishan Hardware Co., LTD is the industry-leading  flat thread roll dies factory. We are ISO certified roll dies factory. 
We have the technical capabilities to developed hundreds special thread profile roll dies for our valued customers past 16 years. We take pride in being the leading flat thread roll dies industry. Ningbo Yishan roll dies are made in our own factory in house at Ningbo China, material cutting, precision milling, Grinding, heat treatments, precision grinding, thread grinding and surface treatments.
One of the most unique aspects about Ningbo Yishan is  customers trust Ningbo Yishan roll dies to be the after heat treatment screw roll dies expert factory. 
Contact DURATUFF and apply today, you can get free thread rolling dies sample to test!