Hangzhou Spring Washer Co., Ltd. is recognized as one of the longest history and the largest manufacturers of spring washers in China, and in the world as well. The company was founded in 1972,which had been for more than 30 years. The company was one of the first enterprises authorized the right of self-handling import and export business in Zhejiang province, and, to date, it is still the only exporting base of spring washer in domestic. Over the past decades, HANGTAN has been well known to its clients and deeply trusted by them, and its products have been sold smoothly over domestic and more than 30 countries and areas such as North America, Europe, and Japan, etc.The company continually makes efforts to explore and develop on the way to technological innovation and products creation. In respect of technological innovation, the company cooperated with TOKUHATSU Corporation Japan in 1990's of 20th century by introducing their technology and equipment, which has brought technology revolution to the spring washer industry in China. In the area of products creation, the company cooperated with Nissei Seiko Co., Ltd. Japan in 2002, who is specialized in manufacturing high-strength bolts. The Sino-Japan two competent parties jointly manufactured series of high-strength hex bolts in grades of 8.8,10.9 and 12.9. Hangzhou Spring Washer Co., Ltd. has invested more than 40 million RMB in comprehensively introducing the technology of forming, forging, heat-treatment, designing, molding and quality management from NISSEI. Most staffs of the company were sent to Japan for training and the Japanese experts also came to the company to give technical instructions. Now the company has become one of the important manufactures of high-strength bolts in China for its high quality.
