2型六角开槽螺母—A和B级 （摘自GB 6180-86）
螺纹规格为M5～M36、A和B级的2型六角开槽螺母。A级用于D≤16的螺母；B级用于D＞16的螺母。
标记示例：
螺纹规格D＝M5、性能等级为9级、表面氧化、A和B级的2型六角开槽螺母的标记：
螺母 GB 6180 M5
螺纹规格为M5～M36、A和B级的2型六角开槽螺母：
|
螺纹规格D
|
da
|
de
|
dw
|
e
|
m
|
m′
|
n
|
s
|
W
|
开口销
|
|
max
|
min
|
max
|
min
|
min
|
min
|
max
|
min
|
min
|
min
|
max
|
max
|
min
|
max
|
min
|
|
M5
|
5.75
|
5
|
-
|
-
|
6.9
|
8.79
|
7.1
|
6.74
|
3.84
|
1.4
|
2
|
8
|
7.85
|
5.1
|
4.8
|
1.2×12
|
|
M6
|
6.75
|
6
|
-
|
-
|
8.9
|
11.05
|
8.2
|
7.84
|
4.32
|
2
|
2.6
|
10
|
9.78
|
5.7
|
5.4
|
1.6×14
|
|
M8
|
8.75
|
8
|
-
|
-
|
11.6
|
14.38
|
10.5
|
10.07
|
5.71
|
2.5
|
3.1
|
13
|
12.73
|
7.5
|
7.14
|
2×16
|
|
M10
|
10.8
|
10
|
-
|
-
|
14.6
|
17.77
|
13.3
|
12.87
|
7.15
|
2.8
|
3.4
|
16
|
15.73
|
9.3
|
8.94
|
2.5×20
|
|
M12
|
13
|
12
|
-
|
-
|
16.6
|
20.03
|
17
|
16.57
|
9.26
|
3.5
|
4.25
|
18
|
17.73
|
12
|
11.57
|
3.2×22
|
|
M14
|
15.1
|
14
|
-
|
-
|
19.6
|
23.35
|
19.1
|
18.58
|
10.7
|
3.5
|
4.25
|
21
|
20.67
|
14.1
|
13.67
|
3.2×26
|
|
M16
|
17.3
|
16
|
-
|
-
|
22.5
|
26.75
|
22.4
|
21.88
|
12.6
|
4.5
|
5.7
|
24
|
23.67
|
16.4
|
15.97
|
4×28
|
|
M20
|
21.6
|
20
|
28
|
27.16
|
27.7
|
32.95
|
26.3
|
25.46
|
15.2
|
4.5
|
5.7
|
30
|
29.16
|
20.3
|
19.46
|
4×36
|
|
M24
|
25.9
|
24
|
34
|
33
|
33.2
|
39.55
|
31.9
|
30.9
|
18.1
|
5.5
|
6.7
|
36
|
35
|
23.9
|
23.06
|
5×40
|
|
M30
|
32.4
|
30
|
42
|
41
|
42.7
|
50.85
|
37.6
|
36.6
|
21.8
|
7
|
8.5
|
46
|
45
|
28.6
|
27.76
|
6.3×50
|
|
M36
|
38.9
|
36
|
50
|
49
|
51.1
|
60.79
|
43.7
|
42.7
|
26.5
|
7
|
8.5
|
55
|
53.8
|
34.7
|
33.7
|
6.3×65
|
注: 尽可能不采用括号内规格。
