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△ 中国标准GB/T1228~1231 钢结构用重型高强度螺栓、螺母、垫圈连接副
螺纹规格M |
M12 |
M16 |
M20 |
M22 |
M24 |
M27 |
M30 |
||||||||
P |
1.75 |
2 |
2.5 |
2.5 |
3 |
3 |
3.5 |
||||||||
dw |
min |
19.2 |
24.9 |
31.4 |
33.3 |
38.0 |
42.8 |
46.5 |
|||||||
k |
公称 |
7.5 |
10 |
12.5 |
14 |
15 |
17 |
18.7 |
|||||||
max |
7.95 |
10.75 |
13.40 |
14.90 |
15.90 |
17.90 |
19.75 |
||||||||
min |
7.05 |
9.25 |
11.60 |
13.10 |
14.10 |
16.10 |
17.65 |
||||||||
k’ |
min |
4.9 |
6.5 |
8.1 |
9.2 |
9.9 |
11.3 |
12.4 |
|||||||
r |
min |
1.0 |
1.0 |
1.5 |
1.5 |
1.5 |
2.0 |
2.0 |
|||||||
S |
max |
21 |
27 |
34 |
36 |
41 |
46 |
50 |
|||||||
min |
20.16 |
26.16 |
33 |
35 |
40 |
45 |
49 |
||||||||
b |
L |
≤40 |
≥45 |
≤50 |
≥55 |
≤60 |
≥65 |
≤65 |
≥70 |
≤70 |
≥75 |
≤75 |
≥80 |
≤80 |
≥85 |
nominal |
25 |
30 |
30 |
35 |
35 |
40 |
40 |
45 |
45 |
50 |
50 |
55 |
55 |
60 |
|
L |
|
25-75 |
45-130 |
50-160 |
55-220 |
60-250 |
65-280 |
70-320 |
螺栓/螺母/垫圈尺寸表 |
|||||||||
螺纹规格M |
M12 |
M16 |
M20 |
M22 |
M24 |
M27 |
M30 |
||
螺距P |
1.75 |
2 |
2.5 |
2.5 |
3 |
3 |
3.5 |
||
螺 |
dw |
min |
19.2 |
24.9 |
31.4 |
33.3 |
38.0 |
42.8 |
46.5 |
c |
max |
0.8 |
0.8 |
0.8 |
0.8 |
0.8 |
0.8 |
0.8 |
|
min |
0.4 |
0.4 |
0.4 |
0.4 |
0.4 |
0.4 |
0.4 |
||
m |
max |
12.3 |
17.1 |
20.7 |
23.6 |
24.2 |
27.6 |
30.7 |
|
min |
11.87 |
16.4 |
19.4 |
22.3 |
22.9 |
26.3 |
29.1 |
||
S |
max |
21 |
27 |
34 |
36 |
41 |
46 |
50 |
|
min |
20.16 |
26.16 |
33 |
35 |
40 |
45 |
49 |
||
垫 |
d2 |
min |
23.7 |
31.4 |
38.4 |
40.4 |
45.4 |
50.1 |
54.1 |
max |
25 |
33 |
40 |
42 |
47 |
52 |
56 |
||
d1 |
min |
13 |
17 |
21 |
23 |
25 |
28 |
31 |
|
max |
13.43 |
17.43 |
21.52 |
23.52 |
25.52 |
28.52 |
31.62 |
||
h |
公称 |
3.0 |
4.0 |
4.0 |
5.0 |
5.0 |
5.0 |
5.0 |
|
min |
2.5 |
3.5 |
3.5 |
4.5 |
4.5 |
4.5 |
4.5 |
||
max |
3.8 |
4.8 |
4.8 |
5.8 |
5.8 |
5.8 |
5.8 |
||
d3 |
min |
15.23 |
19.23 |
24.32 |
26.32 |
28.32 |
32.84 |
35.84 |
|
max |
16.03 |
20.03 |
25.12 |
27.12 |
29.12 |
33.64 |
36.64 |
螺栓、螺母、垫圈使用配合表 |
|||
类别 |
螺栓 |
螺母 |
垫圈 |
型式尺寸 |
按GB/T 1228 |
按GB/T 1229 |
按GB/T 1230 |
性能等级 |
10.9S |
10H |
35~45HRC |
8.8S |
8H |
35~45HRC |
螺栓材料和机械性能 |
|||||||
性能等级 |
螺纹规格 |
材质 |
抗拉强度Mpa |
规定非比例延伸Mpa |
硬度HRC |
伸长率% |
收缩率% |
10.9S |
M12~M24 |
20MnTiB |
1040~1240 |
≥940 |
33~39 |
≥10 |
≥42 |
M27~M30 |
35VB |
||||||
8.8S |
M12~M24 |
20MnTiB |
830~1030 |
≥660 |
24~31 |
≥12 |
≥45 |
M27~M30 |
35VB |
|
螺母机械性能 |
|||||||
螺纹规格M |
M12 |
M16 |
M20 |
M22 |
M24 |
M27 |
M30 |
|
保证载荷(kN) |
10H |
87.7 |
163 |
255 |
315 |
367 |
477 |
583 |
8H |
70 |
130 |
203 |
251 |
293 |
381 |
466 |
|
材料 |
10H |
35或45(GB/T 699)、ML35(GB/T6478) |
||||||
8H |
||||||||
硬度 |
10H |
洛氏硬度98HRB~32HRC、维氏硬度222~304HV30 |
||||||
8H |
洛氏硬度95HRB~30HRC、维氏硬度206~289HV30 |
高强度大六角头螺栓连接副初拧扭矩值To按0.5Tc取值。