Jinan Road ground inside stainless steel hex screws material is generally made of SUS304 stainless steel wire. Circulation within the stainless steel hex head screws have not knurled knurled and two. Stainless steel hex screws from the surface quality of Taian 304 screw rings too close to the material in general, but can be judged from the screw of the production process (industry experience, for reference): generally in the stainless steel hex head screws ruled roll Flowers can determine the process for the production of authentic SUS304 screws. The inside of the head did not knurled stainless steel hex screws can be regarded as slightly worse or material containing low nickel products. However, a detailed analysis was also able to prevail in the report issued by the quality control unit. Stainless steel hexagon socket set screws are made of two Zaozhuang 304 rings, screws, two kinds of SUS304 and SUS316, SUS304 stainless steel hex within our tight end spot sales column. Scope of supply: N3-M12 diameter 4mm-40mm length standard: GB / T79 DIN915 name: Stainless steel carriage bolts (stainless steel carriage bolts) Standard: DIN603 / GB12 / GB14 Material: Stainless steel SUS304 and SUS316 stainless steel carriage bolts Jinan Road ground is mainly put In a threaded hole geometries within connect using carriage bolts square neck portion of the card in the slot to prevent rotation of the bolt with Weifang 304 screw rings during installation | Jinan Road ground (certified) | 304 screw rings provided by Jinan Daoqin Trading Company. Jinan Daoqin Trading Company (www.daoqinshangmao.com) (www.daoqinshangmao.com) Shandong Jinan, hardware accessories leader, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. Jinan Road ground in leadership with the staff warmly welcome all inquiries negotiations to create Jinan Daoqin a better future. You can also access (www.daoqinshangmao.com/supply_details_42227605.html), for more information about the company.