What Is a Socket Screw?

Hexagon socket head screws, also called hex socket head bolts, cup head screws and hex socket head screws, are called differently, but they represent the same meaning. Generally used hexagon socket head screws are 4.8, 8.8, 10.9, and 12.9. Also called hex socket screw. Its head is a hexagonal head and also a cylindrical head. There are stainless steel and iron according to material. Stainless steel has stainless steel SUS202 hex socket head screws. This is a stainless steel common material. There are stainless steel SUS304 hex socket head screws and stainless steel SUS316 hex socket head screws. According to the strength grade of the hexagon socket head screws of iron, there are 4.8 grade hexagon socket head screws, 8.8 grade hexagon socket head screws, 10.9 grade hexagon socket head screws, and 12.9 grade hexagon socket head screws. 8.8-12.9 grade hexagon socket head screws are called high strength and high grade hexagon socket screws.

StandardTitle in Chinese: Hex Socket Head Cap Screws

Release Date IssueDate: 2008-8-25

1. The nominal tensile strength of the bolt material reaches 400MPa;

2. The yield ratio of the bolt material is 0.6; the nominal value of the bolt material

As shown in the following figure and table: ^{[1] [2]}

Thread specifications	Head size		Hexagon size	Nominal length
d	Diameter D	Height K	s	l
M1.6	3	1.6	1.5	2.5-16
M2	3.8	2	1.5	3-20
M2.5	4.5	2.5	2	4-25
M3	5.5	3	2.5	5-30
M4	7	4	3	6-40
M5	8.5	5	4	8-50
M6	10	6	5	10-60
M8	13	8	6	12-80
M10	16	10	8	16-100
M12	18	12	10	20-120
M14	twenty one	14	12	25-140
M16	twenty four	16	14 (12)	25-160
M20	30	20	17 (14)	30-200
M24	36	twenty four	19 (17)	40-200
M30	45	30	22 (19)	45-200
M36	54	36	27 (24)	55-200