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 the material is generally not tell Tianjin stainless steel screws, but you can judge from the screws out of the production process (industry experience Zhengzhou stainless steel screws, for reference): generally in the stainless steel hex screw head straight knurled pattern process can be judged to be authentic SUS304 production 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. Second, thread lock Analysis: a thread with thread lock deflection angle is too large due to: A. Screws, nuts in the process due to the pre-locking force when the cause is not caused by uneven parallel flange faces. Namely: flange and the locking screw is not perpendicular to the direction of the stainless steel screw, so that the screw and nut thread acting surface is not completely in contact (a tilt angle, shown in Figure 4), resulting in the thread with the deflection angle becomes larger: Stainless yongnian screws, stainless steel screws, Jinan Road ground is provided by Jinan Daoqin Trading Company. Jinan Daoqin Trading Company (www.daoqinshangmao.com) (www.daoqinshangmao.com) strong, credible, in Jinan, Shandong and other hardware accessories industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead Jinan Road ground and you work into the brilliant, for a better future!