方头螺栓C级(摘自GB 8-88)
螺纹规格为M10~M48、C级的方头螺栓。
标记示例:
螺纹d=M12、公称长度l=80mm、性能等级为4.8级、不经表面处理的方头螺栓的标记:
螺栓 GB 8 M12×80
螺纹M10~M48、C级的方头螺栓:
螺纹规格
d
|
b
|
e
min
|
K
|
K′
min
|
r
min
|
S
|
X
max
|
l
|
l≤125
|
125
|
l>200
|
公称
|
min
|
max
|
max
|
min
|
M10
|
26
|
32
|
—
|
20.24
|
7
|
6.55
|
7.45
|
5.21
|
0.4
|
16
|
15.57
|
3.8
|
20~100
|
M12
|
30
|
36
|
—
|
22.84
|
8
|
7.55
|
8.45
|
5.91
|
0.6
|
18
|
17.57
|
4.3
|
25~120
|
(M14)
|
34
|
40
|
53
|
26.21
|
9
|
8.55
|
9.45
|
6.61
|
0.6
|
21
|
20.16
|
5
|
25~140
|
M16
|
38
|
44
|
57
|
30.11
|
10
|
9.25
|
10.75
|
6.47
|
0.6
|
24
|
23.16
|
5
|
30~160
|
(M18)
|
42
|
48
|
61
|
34.01
|
12
|
11.1
|
12.9
|
7.77
|
0.8
|
27
|
26.16
|
6.3
|
35~180
|
M20
|
46
|
52
|
65
|
37.91
|
13
|
12.1
|
13.9
|
8.47
|
0.8
|
30
|
29.16
|
6.3
|
35~200
|
(M22)
|
50
|
56
|
69
|
42.9
|
14
|
13.1
|
14.9
|
9.17
|
0.8
|
34
|
33
|
6.3
|
50~220
|
M24
|
54
|
60
|
73
|
45.5
|
15
|
14.1
|
15.9
|
9.87
|
0.8
|
36
|
35
|
7.5
|
60~240
|
(M27)
|
60
|
66
|
79
|
52
|
17
|
16.1
|
17.9
|
11.27
|
1
|
41
|
40
|
7.5
|
60~260
|
M30
|
66
|
72
|
85
|
58.5
|
19
|
17.95
|
20.05
|
12.56
|
1
|
46
|
45
|
8.8
|
60~300
|
M36
|
78
|
84
|
97
|
69.94
|
23
|
21.95
|
24.05
|
15.36
|
1
|
55
|
53.8
|
10
|
80~300
|
M42
|
—
|
96
|
109
|
82.03
|
26
|
24.95
|
27.05
|
17.46
|
1.2
|
65
|
63.1
|
11.3
|
80~300
|
M48
|
—
|
108
|
121
|
95.03
|
30
|
28.95
|
31.05
|
20.26
|
1.6
|
75
|
73.1
|
12.5
|
110~300
|
注: 尽可能不采用括号内的规格。
l的范围:
公称
|
20
|
25
|
30
|
35
|
40
|
45
|
50
|
55
|
60
|
65
|
70
|
80
|
90
|
100
|
110
|
120
|
min
|
18.95
|
23.95
|
28.95
|
33.75
|
38.95
|
43.75
|
48.75
|
53.5
|
58.5
|
63.5
|
68.5
|
78.5
|
88.25
|
98.25
|
108.25
|
118.25
|
max
|
21.05
|
26.05
|
31.05
|
36.25
|
41.25
|
46.25
|
51.25
|
56.5
|
61.5
|
66.5
|
71.5
|
81.5
|
91.75
|
101.75
|
111.75
|
121.75
|
公称
|
130
|
140
|
150
|
160
|
180
|
200
|
220
|
240
|
260
|
280
|
300
|
min
|
128
|
138
|
148
|
156
|
176
|
195.4
|
215.4
|
235.4
|
254.8
|
274.8
|
294.8
|
max
|
132
|
142
|
152
|
164
|
184
|
204.6
|
224.6
|
244.6
|
265.2
|
285.2
|
305.2
|