六角头螺栓 全螺纹 C级 (摘自GB/T 5781-2000)
螺纹规格为M5～M64、全螺纹、性能等级为3.6、4.6和4.8级、产品等级为C级的六角头螺栓。
标记示例：
螺纹规格d＝M12、公称长度l＝80mm、性能等级为4.8级、不经表面处理、全螺纹、产品等级为C级的六角头螺栓的标记：
螺纹GB/T 5781 M12×80
1）β＝15°～30°。
2）无特殊要求的末端。
3）不完整螺纹的长度u≤2P。
4）dw的仲裁基准。
5）允许的垫圈面型式。
6）允许的凹穴型式，由制造者选择。
7）ds≈螺纹中径。
螺纹规格为M5～M64的六角头螺栓：
螺纹规格
d
|
P1)
|
a
|
c
max
|
da
max
|
dw
min
|
e
min
|
k
|
kw2)
min
|
r
min
|
s
|
l
|
max
|
min
|
公称
|
max
|
min
|
公称=max
|
min
|
M5
|
0.8
|
2.4
|
0.8
|
0.5
|
6
|
6.74
|
8.63
|
3.5
|
3.875
|
3.125
|
2.19
|
0.2
|
8.00
|
7.64
|
10～50
|
M6
|
1
|
3
|
1
|
0.5
|
7.2
|
8.74
|
10.89
|
4
|
4.375
|
3.625
|
2.54
|
0.25
|
10.00
|
9.64
|
12～60
|
M8
|
1.25
|
4.00
|
1.25
|
0.6
|
10.2
|
11.47
|
14.2
|
5.3
|
5.675
|
4.925
|
3.45
|
0.4
|
13.00
|
12.57
|
16～80
|
M10
|
1.5
|
4.5
|
1.5
|
0.6
|
12.2
|
14.47
|
17.59
|
6.4
|
6.85
|
5.95
|
4.17
|
0.4
|
16.00
|
15.57
|
20～100
|
M12
|
1.75
|
5.30
|
1.75
|
0.6
|
14.7
|
16.47
|
19.85
|
7.5
|
7.95
|
7.05
|
4.94
|
0.6
|
18.00
|
17.57
|
25～120
|
M16
|
2
|
6
|
2
|
0.8
|
18.7
|
22
|
26.17
|
10
|
10.75
|
9.25
|
6.48
|
0.6
|
24.00
|
23.16
|
30～160
|
M20
|
2.5
|
7.5
|
2.5
|
0.8
|
24.4
|
27.7
|
32.95
|
12.5
|
13.4
|
11.6
|
8.12
|
0.8
|
30.00
|
29.16
|
40～200
|
M24
|
3
|
9
|
3
|
0.8
|
28.4
|
33.25
|
39.55
|
15
|
15.9
|
14.1
|
9.87
|
0.8
|
36
|
35
|
50～240
|
M30
|
3.5
|
10.5
|
3.5
|
0.8
|
35.4
|
42.75
|
50.85
|
18.7
|
19.75
|
17.65
|
12.36
|
1
|
46
|
45
|
60～300
|
M36
|
4
|
12
|
4
|
0.8
|
42.4
|
51.11
|
60.79
|
22.5
|
23.55
|
21.45
|
15.02
|
1
|
55.0
|
53.8
|
70～360
|
M42
|
4.5
|
13.5
|
4.5
|
1
|
48.6
|
59.95
|
71.3
|
26
|
27.05
|
24.95
|
17.47
|
1.2
|
65.0
|
63.1
|
80～420
|
M48
|
5
|
15
|
5
|
1
|
56.6
|
69.45
|
82.6
|
30
|
31.05
|
28.95
|
20.27
|
1.6
|
75.0
|
73.1
|
100～480
|
M56
|
5.5
|
16.5
|
5.5
|
1
|
67
|
78.66
|
93.56
|
35
|
36.25
|
33.75
|
23.63
|
2
|
85.0
|
82.8
|
110～500
|
M64
|
6
|
18
|
6
|
1
|
75
|
88.16
|
104.86
|
40
|
41.25
|
38.75
|
27.13
|
2
|
95.0
|
92.8
|
120～500
|
l的范围：
公称
|
10
|
12
|
16
|
20
|
25
|
30
|
35
|
40
|
45
|
50
|
55
|
60
|
65
|
70
|
80
|
90
|
100
|
110
|
min
|
9.25
|
11.1
|
15.1
|
18.95
|
23.95
|
28.95
|
33.75
|
38.75
|
43.75
|
48.7
|
53.5
|
58.5
|
63.5
|
68.5
|
78.5
|
88.25
|
98.25
|
108.2
|
max
|
10.75
|
12.9
|
16.9
|
21.05
|
26.05
|
31.0
|
36.25
|
41.2
|
46.25
|
51.25
|
56.5
|
61.5
|
66.5
|
71.5
|
81.5
|
91.75
|
101.7
|
111.75
|
公称
|
120
|
130
|
140
|
150
|
160
|
180
|
200
|
220
|
240
|
260
|
280
|
300
|
320
|
340
|
360
|
380
|
400
|
min
|
118.25
|
128
|
138
|
148
|
156
|
176
|
195.4
|
215.4
|
235.4
|
254.8
|
274.8
|
294.8
|
314.3
|
334.3
|
354.3
|
374.3
|
394.3
|
max
|
121.75
|
132
|
142
|
152
|
164
|
184
|
204.6
|
224.6
|
244.6
|
265.2
|
285.2
|
305.2
|
325.7
|
345.7
|
365.7
|
385.7
|
405.7
|
公称
|
420
|
440
|
460
|
480
|
min
|
413.7
|
433.7
|
453.7
|
473.7
|
max
|
426.3
|
446.3
|
466.3
|
486.3
|
非优选的螺纹规格：
螺纹规格
d
|
P1)
|
a
|
c
max
|
da
max
|
dw
min
|
e
min
|
k
|
kw2)
min
|
r
min
|
s
|
l3)
|
max
|
min
|
公称
|
max
|
min
|
公称=max
|
min
|
M14
|
2
|
6
|
2
|
0.6
|
16.7
|
19.15
|
22.78
|
8.8
|
9.25
|
8.35
|
5.85
|
0.6
|
21.00
|
20.16
|
30～140
|
M18
|
2.5
|
7.5
|
2.5
|
0.8
|
21.2
|
24.85
|
29.56
|
11.5
|
12.4
|
10.6
|
7.42
|
0.6
|
27.00
|
26.16
|
35～180
|
M22
|
2.5
|
7.5
|
2.5
|
0.8
|
26.4
|
31.35
|
37.29
|
14
|
14.9
|
13.1
|
9.17
|
0.8
|
34
|
33
|
45～220
|
M27
|
3
|
9
|
3
|
0.8
|
32.4
|
38
|
45.2
|
17
|
17.9
|
16.1
|
11.27
|
1
|
41
|
40
|
55～280
|
M33
|
3.5
|
10.5
|
3.5
|
0.8
|
38.4
|
46.55
|
55.37
|
21
|
22.05
|
19.95
|
13.97
|
1
|
50
|
49
|
60～360
|
M39
|
4
|
12
|
4
|
1
|
45.4
|
55.86
|
66.44
|
25
|
26.05
|
23.95
|
16.77
|
1
|
60.0
|
58.8
|
70～400
|
M45
|
4.5
|
13.5
|
4.5
|
1
|
52.6
|
64.7
|
76.95
|
28
|
29.05
|
26.95
|
18.87
|
1.2
|
70.0
|
68.1
|
80～440
|
M52
|
5
|
15
|
5
|
1
|
62.6
|
74.2
|
88.25
|
33
|
34.25
|
31.75
|
22.23
|
1.6
|
80.0
|
78.1
|
90～500
|
M60
|
5.5
|
16.5
|
5.5
|
1
|
71
|
83.41
|
99.218
|
38
|
39.25
|
36.75
|
25.73
|
2
|
90.0
|
87.8
|
110～500
|
l的范围：
公称
|
30
|
35
|
40
|
45
|
50
|
55
|
60
|
65
|
70
|
80
|
90
|
100
|
110
|
120
|
130
|
140
|
150
|
160
|
min
|
28.95
|
33.75
|
38.75
|
43.75
|
48.7
|
53.5
|
58.5
|
63.5
|
68.5
|
78.5
|
88.25
|
98.25
|
108.2
|
118.25
|
128
|
138
|
148
|
156
|
max
|
31.0
|
36.25
|
41.2
|
46.25
|
51.25
|
56.5
|
61.5
|
66.5
|
71.5
|
81.5
|
91.75
|
101.7
|
111.75
|
121.75
|
132
|
142
|
152
|
164
|
公称
|
180
|
200
|
220
|
240
|
260
|
280
|
300
|
320
|
340
|
360
|
380
|
400
|
420
|
440
|
460
|
480
|
500
|
min
|
176
|
195.4
|
215.4
|
235.4
|
254.8
|
274.8
|
294.8
|
314.3
|
334.3
|
354.3
|
374.3
|
394.3
|
413.7
|
433.7
|
453.7
|
473.7
|
493.7
|
max
|
184
|
204.6
|
224.6
|
244.6
|
265.2
|
285.2
|
305.2
|
325.7
|
345.7
|
365.7
|
385.7
|
405.7
|
426.3
|
446.3
|
466.3
|
486.3
|
506.3
|
