六角厚螺母(摘自GB 56-88)
螺纹规格为M16～M48的六角厚螺母。
标记示例：
螺纹规格D＝M20、机械性能为5级、不经表面处理的六角厚螺母的标记：
螺母 GB 56 M20
螺纹规格为M16～M48的六角厚螺母：
螺纹规格
D
|
da
|
dw
|
e
|
m
|
m′
|
s
|
max
|
min
|
min
|
min
|
max
|
min
|
min
|
max
|
min
|
M16
|
17.3
|
16
|
22.5
|
26.17
|
25
|
24.16
|
19.33
|
24
|
23.16
|
M18
|
19.5
|
18
|
24.8
|
29.56
|
28
|
27.16
|
21.73
|
27
|
26.16
|
M20
|
21.6
|
20
|
27.7
|
32.95
|
32
|
30.4
|
24.32
|
30
|
29.16
|
M22
|
23.7
|
22
|
31.4
|
37.29
|
35
|
33.4
|
26.72
|
34
|
33
|
M24
|
25.9
|
24
|
33.2
|
39.55
|
38
|
36.4
|
29.12
|
36
|
35
|
M27
|
29.1
|
27
|
38
|
45.2
|
42
|
40.4
|
32.32
|
41
|
40
|
M30
|
32.4
|
30
|
42.7
|
50.85
|
48
|
46.4
|
37.12
|
46
|
45
|
M36
|
38.9
|
36
|
51.1
|
60.79
|
55
|
53.1
|
42.48
|
55
|
53.8
|
M42
|
45.4
|
42
|
60.6
|
72.09
|
65
|
63.1
|
50.48
|
65
|
63.8
|
M48
|
51.8
|
48
|
69.4
|
82.6
|
75
|
73.1
|
58.48
|
75
|
73.1
|
