开槽半沉头不脱出螺钉 (摘自GB 949-88)
螺纹规格为M3~10的开槽半沉头不脱出螺钉。
标记示例:
螺纹规格d=M5、公称长度l=20mm、性能等级为4.8级、不经表面处理的开槽半沉头不脱出螺钉的标记:
螺钉 GB 949 M5×20
螺纹规格为M3~10的开槽半沉头不脱出螺钉:
螺纹规格
d
|
dk
|
f≈
|
K
max
|
n
|
rf ≈
|
t
|
d1
|
b
|
r
max
|
C≈
|
l
|
理论值
max
|
实际值
|
max
|
min
|
公称
|
min
|
max
|
max
|
min
|
max
|
min
|
M3
|
6.3
|
5.5
|
5.2
|
0.7
|
1.65
|
0.8
|
0.86
|
1.00
|
6
|
1.45
|
1.2
|
2
|
1.68
|
4
|
0.8
|
1
|
10~25
|
M4
|
9.4
|
8.4
|
8.0
|
1
|
2.7
|
1.2
|
1.26
|
1.51
|
9.5
|
1.9
|
1.6
|
2.8
|
2.66
|
6
|
1.0
|
1.2
|
12~30
|
M5
|
10.4
|
9.3
|
8.9
|
1.2
|
2.7
|
1.2
|
1.26
|
1.51
|
9.5
|
2.4
|
2.0
|
3.5
|
3.32
|
8
|
1.3
|
1.6
|
14~40
|
M6
|
12.6
|
11.3
|
10.9
|
1.4
|
3.3
|
1.6
|
1.66
|
1.91
|
12
|
2.8
|
2.4
|
4.5
|
4.32
|
10
|
1.5
|
2
|
20~50
|
M8
|
17.3
|
15.8
|
15.4
|
2
|
4.65
|
2
|
2.06
|
2.31
|
16.5
|
3.7
|
3.2
|
5.5
|
5.32
|
12
|
2.0
|
2.5
|
25~60
|
M10
|
20
|
18.3
|
17.8
|
2.3
|
5
|
2.5
|
2.56
|
2.81
|
19.5
|
4.4
|
3.8
|
7
|
6.78
|
15
|
2.5
|
3
|
30~60
|
l的范围:
公称
|
10
|
12
|
(14)
|
16
|
20
|
25
|
30
|
35
|
40
|
45
|
50
|
(55)
|
60
|
min
|
9.71
|
11.65
|
13.65
|
15.65
|
19.58
|
24.58
|
29.58
|
34.50
|
39.50
|
44.50
|
49.50
|
54.05
|
59.05
|
max
|
10.29
|
12.35
|
14.35
|
16.35
|
20.42
|
25.42
|
30.42
|
35.50
|
40.50
|
45.50
|
50.50
|
55.95
|
60.95
|