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 represents the same meaning. Generally commonly used hex cylindrical head screws, there are 4.8, 8.8, 10.9, 12.9. Also known as hex screws, also known as hex bolts. Its head is hexagonal head, also cylindrical head. There are Stainless Steel and iron according to the material. Stainless steel with stainless steel SUS202 hex cylindrical head screws, this is stainless steel ordinary material, stainless steel SUS304 hex cylindrical head screws, stainless steel SUS316 hex cylindrical head screws. According to the strength of the hex socket head screw, there are 4.8 grade hex socket head screw, 8.8 grade hex socket head screw, 10.9 grade hex socket head screw, 12.9 grade hex socket head screw. Class 8.8 -12.9 hex socket cylindrical head screws are called high strength and high grade hex socket bolts.
Hexagon bolts are divided into ordinary and high strength according to the grade strength. Ordinary hex bolts refer to Class 4.8, high strength hex bolts refer to class 8.8 and above, including class 10.9 and 12.9. Class 12.9 hex bolts generally refer to knurled, uncolored black hex cup head screws with oil.
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