Hexagon socket head cap screws, commonly referred to in the industry as hex socket bolts, cup head screws, or hex socket screws, feature a cylindrical head with an internal hexagon socket. The head socket can also be designed as an internal梅花槽 (Torx), cross slot, or flat slot. Common materials used in screw production include iron and stainless steel. Iron material is also known as carbon steel, which is categorized into the following types: low carbon steel, medium carbon steel, high carbon steel, and alloy steel. Commonly used stainless steel materials include: SUS201, SUS304, SUS316, and SUS410.

Surface treatment of screws varies depending on the material. Stainless steel materials are typically only cleaned to maintain their natural appearance. If there are salt spray (special anti-corrosion) requirements, passivation treatment can be applied later to enhance corrosion resistance. Surface treatment for iron materials generally involves electroplating, which is divided into standard electroplating and environmentally friendly electroplating. Common electroplating materials include: white zinc, white nickel, black oxide, black zinc, black nickel, blue zinc, and colored zinc.

       Our company specializes in the production and sale of various precision screws, electronic screws, toy screws, and custom non-standard screw processing using materials such as SUS304, 316 stainless steel, and carbon steel. Our products include hex head, socket head, cup head, round head, and countersunk head screws. Standards we adhere to include German standard DIN, Chinese national standard GB, and international standard ISO. Relevant reference standards: pan head machine screws, GB818, GB818-85; countersunk head machine screws, GB819, GB819-85; pan head self-tapping screws, GB845, DIN7981; countersunk head self-tapping screws, GB846, DIN7982; ISO7380 round head hex socket screws; DIN7991 countersunk head hex socket screws; GB70, DIN912, DIN7984 cup head hex socket screws. We also provide corresponding distribution services.