六角头铰制孔用螺栓 A和B级 （摘自GB 27-88）
螺纹规格为M6～M48、A和B级的六角铰制孔用螺栓。
标记示例：
螺纹d＝M12、ds尺寸按表1规定，公称长度l＝80mm、机械性能为8.8级、表&氧化处理、A级的六角头铰制孔用螺栓的标记：
螺栓 GB 27 M12×80
ds按m6制造时应加标记m6
螺栓 GB 27 M12m6×80
螺纹规格为M6～M48的六角铰制孔用螺栓：
|
螺纹规格
d
|
ds
(h9)
|
s
|
K
|
r
|
dp
|
l2
|
e
min
|
g
|
d
|
l3
|
|
max
|
min
|
max
|
min
|
A
|
B
|
min
|
A
|
B
|
|
A
|
B
|
公称
|
min
|
max
|
min
|
max
|
|
M6
|
7
|
6.964
|
10
|
9.78
|
9.64
|
4
|
3.85
|
4.15
|
3.76
|
4.24
|
0.25
|
4
|
1.5
|
11.05
|
10.89
|
2.5
|
6
|
13～53
|
|
M8
|
9
|
8.964
|
13
|
12.73
|
12.57
|
5
|
4.85
|
5.15
|
4.76
|
5.24
|
0.4
|
5.5
|
1.5
|
14.38
|
14.20
|
2.5
|
8
|
10～65
|
|
M10
|
11
|
10.957
|
16
|
15.73
|
15.57
|
6
|
5.85
|
6.15
|
5.76
|
6.24
|
0.4
|
7
|
2
|
17.77
|
17.59
|
2.5
|
10
|
12～102
|
|
M12
|
13
|
12.957
|
18
|
17.73
|
17.57
|
7
|
6.82
|
7.18
|
6.71
|
7.29
|
0.6
|
8.5
|
2
|
20.03
|
19.85
|
2.5
|
12
|
13～158
|
|
（M14）
|
15
|
14.957
|
21
|
20.67
|
20.16
|
8
|
7.82
|
8.18
|
7.71
|
8.29
|
0.6
|
10
|
3
|
23.35
|
22.78
|
3.5
|
14
|
15～155
|
|
M16
|
17
|
16.957
|
24
|
23.67
|
23.16
|
9
|
8.82
|
9.18
|
8.71
|
9.29
|
0.6
|
12
|
3
|
26.75
|
26.17
|
3.5
|
16
|
17～172
|
|
（M18）
|
19
|
18.948
|
27
|
26.67
|
26.16
|
10
|
9.82
|
10.18
|
9.71
|
10.29
|
0.6
|
13
|
3
|
30.14
|
29.56
|
3.5
|
18
|
20～170
|
|
M20
|
21
|
20.948
|
30
|
29.67
|
29.16
|
11
|
10.78
|
11.22
|
10.65
|
11.35
|
0.8
|
15
|
4
|
33.53
|
32.95
|
3.5
|
20
|
23～168
|
|
（M22）
|
23
|
22.948
|
34
|
33.38
|
33
|
12
|
11.78
|
12.22
|
11.65
|
12.35
|
0.8
|
17
|
4
|
37.72
|
37.29
|
3.5
|
22
|
25～165
|
|
M24
|
25
|
24.948
|
36
|
35.38
|
35
|
13
|
12.78
|
13.22
|
12.65
|
13.35
|
0.8
|
18
|
4
|
39.98
|
39.55
|
5
|
24
|
27～162
|
|
（M27）
|
28
|
27.948
|
41
|
—
|
40
|
15
|
—
|
—
|
14.65
|
15.35
|
1
|
21
|
5
|
—
|
45.2
|
5
|
27
|
33～158
|
|
M30
|
32
|
31.938
|
46
|
—
|
45
|
17
|
—
|
—
|
16.65
|
17.35
|
1
|
23
|
5
|
—
|
50.85
|
5
|
30
|
30～180
|
|
M36
|
38
|
37.938
|
55
|
—
|
53.8
|
20
|
—
|
—
|
19.58
|
20.42
|
1
|
28
|
6
|
—
|
60.79
|
5
|
36
|
35～245
|
|
M42
|
44
|
43.938
|
65
|
—
|
63.8
|
23
|
—
|
—
|
22.58
|
23.42
|
1.2
|
33
|
7
|
—
|
72.02
|
5
|
42
|
45～235
|
|
M48
|
50
|
49.938
|
75
|
—
|
73.1
|
26
|
—
|
—
|
25.58
|
26.42
|
1.6
|
38
|
8
|
—
|
82.60
|
5
|
48
|
50～230
|
注：尽可能不采用括号内的规格。
l的范围：
|
公称
|
25
|
(28)
|
30
|
(32)
|
35
|
(38)
|
40
|
45
|
50
|
(55)
|
60
|
(65)
|
70
|
(75)
|
80
|
(85)
|
90
|
(95)
|
100
|
110
|
|
产
品
等
级
|
A
|
min
|
24.58
|
27.58
|
29.58
|
31.50
|
34.50
|
37.50
|
39.50
|
44.50
|
49.50
|
54.50
|
59.05
|
64.05
|
69.05
|
74.05
|
79.05
|
83.90
|
88.90
|
93.90
|
98.90
|
108.90
|
|
max
|
25.42
|
28.42
|
30.42
|
32.50
|
35.50
|
38.50
|
40.50
|
45.50
|
50.50
|
55.95
|
60.95
|
65.95
|
70.95
|
75.95
|
80.95
|
86.10
|
91.10
|
96.10
|
101.10
|
111.10
|
|
B
|
min
|
—
|
—
|
—
|
—
|
—
|
—
|
—
|
—
|
—
|
—
|
58.50
|
63.50
|
68.50
|
73.50
|
78.50
|
83.25
|
88.25
|
93.25
|
98.25
|
108.25
|
|
max
|
—
|
—
|
—
|
—
|
—
|
—
|
—
|
—
|
—
|
—
|
61.50
|
66.50
|
71.50
|
76.50
|
81.50
|
86.75
|
91.75
|
96.75
|
101.75
|
111.75
|
|
公称
|
120
|
130
|
140
|
150
|
160
|
170
|
180
|
190
|
200
|
210
|
220
|
230
|
240
|
250
|
260
|
280
|
300
|
|
产
品
等
级
|
A
|
min
|
118.90
|
128.75
|
138.75
|
148.75
|
—
|
—
|
—
|
—
|
—
|
—
|
—
|
—
|
—
|
—
|
—
|
—
|
—
|
|
max
|
121.10
|
131.25
|
141.25
|
151.25
|
—
|
—
|
—
|
—
|
—
|
—
|
—
|
—
|
—
|
—
|
—
|
—
|
—
|
|
B
|
min
|
118.25
|
128.00
|
138.00
|
148.00
|
158.00
|
168.00
|
178.00
|
187.70
|
197.70
|
207.70
|
217.70
|
227.70
|
237.70
|
247.70
|
257.40
|
277.40
|
297.40
|
|
max
|
121.75
|
132.00
|
142.00
|
152.00
|
162.00
|
172.00
|
182.00
|
192.30
|
202.30
|
212.30
|
222.30
|
232.30
|
242.30
|
252.30
|
262.60
|
282.60
|
302.60
|
