Stainless steel hex screws inside a stainless steel SUS201 material generally Yantai pan head Phillips screws, stainless steel SUS304 Jining pan head Phillips screws, stainless steel SUS316 and so on. Customer common stainless steel hex screws with a head angle with knurled and without knurled two kinds. Stainless steel hexagonal inner judge in the end is what the material, there are a several ways. The first is with the naked eye, which are more abundant screws require a technician or salesperson. But with the naked eye in the stainless steel hex screws in the end is what material, generally there will be errors, that is not quite accurate. The second is to test the water treatment. What the test material stainless hex few drops of syrup on Liaocheng pan head screws Phillips screws in stainless steel, if it will change color, it will turn red, that is, SUS201 stainless steel hex screws, if the color is not above grade stainless steel SUS304 screws. Generally in the stainless steel hex head screws ruled knurled process can be judged to be authentic SUS304 production screws. The inside of the head did not knurled stainless steel hexagonal Product Name: inner cylindrical stainless steel hex head screws Product Standard: DIN912 Products: inner cylindrical stainless steel hex head screws SUS304 stainless steel cold heading wire made of hexagonal screw machining large sizes of stainless steel and into, within all of the company products are stainless steel hex screws SUS316 SUS304 material and material roll faceplate head Phillips head screws, nickel reached the national standard, can provide original material reports and warranty certificate. Scope of supply: Size: M3-M72 Products Name: flat head / sink stainless steel hex head screws Product Standard: DIN7991 Products: countersunk stainless steel hex head screws, also known as flat head stainless steel hexagonal screw within the general use as an anti-theft machine screws. Stainless steel hex screws countersunk head after using the product surface is flush with the head, does not affect the appearance of the product, and the difference is the use of machine screws Allen wrench installation and removal. Products are made of SUS304 stainless steel and stainless steel two kinds. Scope of supply: Size: M3-M12 Liaocheng pan head Phillips screws, pan head Phillips 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! You can also access (www.daoqinshangmao.com/supply_details_41027145.html), for more information about the company.