... (ISO 9001 2008). We can produce high quality bolt and nut per customer's requirements. The feature of our products is ... High-strength, endure low temperature, anti-corrosionWe purchase raw materials from foreign or large-sized steel mills, the company ... .8,6.8,8.8Size of nolt:m6~m36Size of nut:m3~m64Material:carbon steelStandard:DIN,GB,BSWFinished:palin,black,yellow ...