Cylindrical head hex socket screw, also referred to as hex socket bolt, cup head screw, hex socket screw, its name is not the same, but the meaning is the same.

Commonly used hexagon socket head screws are grade 4.8, 8.8, 10.9, 12.9. Also called hex socket screw, also called hex socket bolt. Its head is hexagonal head, but also cylindrical head.

According to the material is divided into stainless steel and iron. Stainless steel has stainless steel SUS201 hex socket head screw, this is stainless steel ordinary material, stainless steel SUS304 hex socket head screw, stainless steel SUS316 hex socket head screw. Iron according to the strength of the HEX SOCKET head screws, there are 4.8 Hex socket head screws, whose material is Q235 commonly, 8.8 Hex socket head screws, whose material is 35K or 45# steel commonly, 10.9 Hex socket head screws, whose material is 40Cr or 35CrMo commonly, 12.9 hex socket head screws, whose material is 10b21, 35CrMo, 42CrMo commonly. Hexagon socket head screws, class 8.8 -12.9, are called high strength and high grade hexagon socket bolts.