小方头螺栓 B级(摘自GB 35-88)
螺纹规格为M5~M48、B级的小方头螺栓。
标记示例:
螺纹规格d=M12、公称长度l=80mm、性能等级d5.8级、不经表面处理的小方头螺栓的标记:
螺栓 GB 35 M12×80
螺纹规格为M5~M48、B级的小方头螺栓:
d
|
b
|
e
min
|
K
|
K′
|
r
min
|
S
|
X
max
|
l
|
l≤125
|
125<l≤125
|
l>200
|
公称
|
min
|
max
|
min
|
max
|
min
|
M5
|
16
|
—
|
—
|
9.93
|
3.5
|
3.26
|
3.74
|
2.28
|
0.2
|
8
|
7.64
|
2
|
20~50
|
M6
|
18
|
—
|
—
|
12.53
|
4
|
3.76
|
4.24
|
2.63
|
0.25
|
10
|
9.64
|
2.5
|
30~60
|
M8
|
22
|
28
|
—
|
16.34
|
5
|
4.76
|
5.24
|
3.33
|
0.4
|
13
|
12.57
|
3.2
|
35~80
|
M10
|
26
|
32
|
—
|
20.24
|
6
|
5.76
|
6.24
|
4.03
|
0.4
|
16
|
15.57
|
3.8
|
40~100
|
M12
|
30
|
36
|
—
|
22.84
|
7
|
6.71
|
7.29
|
4.70
|
0.6
|
18
|
17.57
|
4.3
|
45~120
|
(M14)
|
34
|
40
|
—
|
26.21
|
8
|
7.71
|
8.29
|
5.4
|
0.6
|
21
|
20.16
|
5
|
55~140
|
M16
|
38
|
44
|
57
|
30.11
|
9
|
8.71
|
9.29
|
6.1
|
0.6
|
24
|
23.16
|
5
|
55~160
|
(M18)
|
42
|
48
|
61
|
34.01
|
10
|
9.71
|
10.29
|
6.8
|
0.8
|
27
|
26.13
|
6.3
|
60~180
|
M20
|
46
|
52
|
65
|
37.91
|
11
|
10.65
|
11.35
|
7.45
|
0.8
|
30
|
29.16
|
6.3
|
65~200
|
(M22)
|
50
|
56
|
69
|
42.9
|
12
|
11.65
|
12.35
|
8.15
|
0.8
|
34
|
33
|
6.3
|
70~220
|
M24
|
54
|
60
|
73
|
45.5
|
13
|
12.65
|
13.35
|
8.85
|
0.8
|
36
|
35
|
7.5
|
80~240
|
(M27)
|
60
|
66
|
79
|
52
|
15
|
14.65
|
15.35
|
10.25
|
1
|
41
|
40
|
7.5
|
90~260
|
M30
|
66
|
72
|
85
|
58.5
|
17
|
16.65
|
17.35
|
11.65
|
1
|
46
|
45
|
8.8
|
90~300
|
M36
|
78
|
84
|
97
|
69.94
|
20
|
19.58
|
20.42
|
13.71
|
1
|
55
|
53.5
|
10
|
110~300
|
M42
|
—
|
96
|
109
|
82.03
|
23
|
22.58
|
23.42
|
15.81
|
1.2
|
65
|
63.1
|
11.3
|
130~200
|
M48
|
—
|
108
|
121
|
95.05
|
26
|
25.58
|
26.42
|
17.91
|
1.6
|
75
|
73.1
|
12.5
|
140~300
|
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
|
38.75
|
43.75
|
48.75
|
53.5
|
58.5
|
63.5
|
68.5
|
78.5
|
88.25
|
98.25
|
108.2
|
118.25
|
max
|
21.05
|
26.05
|
31.0
|
36.25
|
41.25
|
46.25
|
51.25
|
56.5
|
61.5
|
66.5
|
71.5
|
81.5
|
91.75
|
101.7
|
111.75
|
121.75
|
公称
|
130
|
140
|
150
|
160
|
180
|
200
|
220
|
240
|
260
|
280
|
300
|
min
|
128
|
138
|
148
|
158
|
178
|
197.7
|
217.7
|
237.7
|
257.4
|
277.4
|
297.4
|
max
|
132
|
142
|
152
|
162
|
182
|
202.3
|
222.3
|
242.3
|
262.6
|
282.6
|
302.6
|