Stainless steel hexagonal screw

Combination bolts are generally made of stainless steel SUS201, stainless steel SUS304, stainless steel SUS316 and other materials. The stainless steel hexagon socket screws commonly used by customers are divided into two types: knurled head and non-knurled head. There are several ways to judge the material of combi bolts. The first method is to judge with the naked eye, which requires experienced screw technicians or sales personnel, but the naked eye judgment of the material of stainless steel hexagon socket screws usually has errors and is not very accurate. The second method is to use a potion test. Drop a few drops of stainless steel material test solution on the combi bolts. If it changes color and turns red, it is a stainless steel hexagon socket screw. If it does not change color, it is stainless steel or a higher grade screw. Generally speaking, a combination locking bolt with a straight grain rolling process on the head can be judged as a screw made of authentic SUS3044 mater…