... 4Grade:8.8,10.9,12.9 Tortutous type grade10.9 high strength bolts nuts and ... washers for steel structures I. Specification: GB 3632, DIN, ASTM, JIS, ... KIND OF HIGH STRENGTH BOLT, GB/T 3632 IV. Our strength on exporting:1.Our company (Suzhou ... Certificate 2. Various honorary certificates 3. Product Torshear type high strength bolt,nut and plainwasher for steel structures ...