Cylindrical head hex head screw, also referred to as hex head bolt, cup head screw, hex head screw, its name is not the same, but the meaning is the same. Generally used hex cylindrical head screws, then there are 4.8 6.8 8.8 10.9 12.9. Also called hex screws, also called hex bolts. Its head is hexagonal head, but also cylindrical head. There are stainless steel and iron by material.
Stainless steel has stainless steel SUS202 hex cylindrical head screws, this is stainless steel ordinary material, there are stainless steel SUS304 hex cylindrical head screws, there are stainless steel SUS316 hex cylindrical head screws. According to the strength of the hex cylindrical head screw, there are 4.8 hex cylindrical head screws, 8.8 hex cylindrical head screws, 10.9 hex cylindrical head screws, and 12.9 hex cylindrical head screws. 8.8-12.9 class hex cylindrical head screws are called high-strength and high-grade hex bolts.
| specification table |
| Stainless steel hexagon bolt |
Screw diametet
( d) |
Coarse thread distance ( P ) |
|
Head thickness (k) |
|
Hexagonal hole depth ( t ) |
| max |
min |
max |
min |
max |
min |
min |
| :mm |
| M1.4 |
0.3 |
2.74 |
2.46 |
1.4 |
1.26 |
1.36 |
1.32 |
0.6 |
| M1.6 |
0.35 |
3.14 |
2.86 |
1.6 |
1.46 |
1.56 |
1.52 |
0.7 |
| M2 |
0.4 |
3.98 |
3.62 |
2 |
1.86 |
1.56 |
1.52 |
1 |
| M2.5 |
0.45 |
4.68 |
4.32 |
2.5 |
2.36 |
2.06 |
2.02 |
1.1 |
| M3 |
0.5 |
5.68 |
5.32 |
3 |
2.86 |
2.58 |
2.52 |
1.3 |
| M4 |
0.7 |
7.22 |
6.78 |
4 |
3.82 |
3.08 |
3.02 |
2 |
| M5 |
0.8 |
8.72 |
8.28 |
5 |
4.82 |
4.095 |
4.02 |
2.5 |
| M6 |
1 |
10.22 |
9.78 |
6 |
5.7 |
5.14 |
5.02 |
3 |
| M8 |
1.25 |
13.27 |
12.73 |
8 |
7.64 |
6.14 |
6.02 |
4 |
| M10 |
1.5 |
16.27 |
15.73 |
10 |
9.64 |
8.175 |
8.025 |
5 |
| M12 |
1.75 |
18.27 |
17.73 |
12 |
11.57 |
10.18 |
10.03 |
6 |
| M14 |
2 |
21.33 |
20.67 |
14 |
12.57 |
12.21 |
12.03 |
7 |
| M16 |
2 |
24.33 |
23.67 |
16 |
15.57 |
14.21 |
14.03 |
8 |
| M18 |
2.5 |
27.33 |
26.67 |
18 |
17.57 |
14.21 |
14.03 |
9 |
| M20 |
2.5 |
30.33 |
19.67 |
20 |
19.48 |
17.23 |
17.05 |
10 |
| M22 |
2.5 |
33.39 |
32.61 |
22 |
21.48 |
17.23 |
17.05 |
11 |
| M24 |
3 |
36.36 |
35.61 |
24 |
23.48 |
19.28 |
19.07 |
12 |
| M27 |
3 |
40.39 |
39.61 |
27 |
26.48 |
19.28 |
19.07 |
13.5 |
| M30 |
3.5 |
45.39 |
44.61 |
30 |
29.48 |
22.28 |
22.07 |
15.6 |
The national standard of hexagonal cylindrical head screws is the national standard GB70-1985, there are many specifications and sizes, the common specification standards are 3*8, 3* 10,3 * 12,3 * 16,3 * 20,3 * 25,3 *30, 3*45, 4*8, 4* 10,4 * 12,4 * 16,4 * 20,4 * 25,4 *30, 3*45, 3*8, 4*10, 4*12, 4*16, 4*20, 4*25, 4*30, 4* 35,4 *45, 5* 10,5 * 12,5 * 16,5 * 20,5 * 25,6 * 12,6 * 14,6 * 16,6 * 25,8 * 14,8 * 16,8 * 20,8 * 25,8 * 30,8 * 35,8 *40 and so on.
Steel structure connection with hexagon bolts performance grade 3.6, 4.6, 4.8, 5.6, 6.8, 8.8, 9.8, 10.9, 12.9 and other more than 10 grades, of which 8.8 and above bolts are made of low carbon alloy steel or medium carbon steel and heat treatment (quenching, tempering), known as high strength bolts, the rest known as ordinary bolts. The bolt performance grade label consists of two parts, which respectively represent the nominal tensile strength value and the flexure ratio of the bolt material.
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