开槽半沉头螺钉 (摘自GB/T 69-2000)
螺纹规格为M1.6~M10、性能等级为4.8、5.8、A2-50、A7-50、CU2、CU3和AL4、产品等级为A级的开槽半沉头螺钉。
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A级开槽半沉头螺钉的标记:
螺钉 GB/T 69 M5×20
螺纹规格为M1.6~M10的开槽半沉头螺钉:
螺纹规格
d
|
P2)
|
a
|
b
|
dk3)
|
f≈
|
k3)
|
n
|
r
min
|
rf≈
|
t
|
x
max
|
l1)、
|
max
|
min
|
理论值
|
实际值
|
公称=max
|
公称
|
max
|
min
|
max
|
min
|
max
|
公称=max
|
min
|
M1.6
|
0.35
|
0.7
|
25
|
3.6
|
3
|
2.7
|
0.4
|
1
|
0.4
|
0.60
|
0.46
|
0.4
|
3
|
0.8
|
0.64
|
0.9
|
2.5~16
|
M2
|
0.4
|
0.8
|
25
|
4.4
|
3.8
|
3.5
|
0.5
|
1.2
|
0.5
|
0.70
|
0.56
|
0.5
|
4
|
1
|
0.8
|
1
|
3~20
|
M2.5
|
0.45
|
0.9
|
25
|
5.5
|
4.7
|
4.4
|
0.6
|
1.5
|
0.6
|
0.80
|
0.66
|
0.6
|
5
|
1.2
|
1.0
|
1.1
|
4~25
|
M3
|
0.5
|
1
|
25
|
6.3
|
5.5
|
5.2
|
0.7
|
1.65
|
0.8
|
1.00
|
0.86
|
0.8
|
6
|
1.45
|
1.20
|
1.25
|
5~30
|
(M3.5)1)
|
0.6
|
1.2
|
38
|
8.2
|
7.3
|
6.94
|
0.8
|
2.35
|
1
|
1.20
|
1.06
|
1
|
8.5
|
1.7
|
1.4
|
1.5
|
6~35
|
M4
|
0.7
|
1.4
|
38
|
9.4
|
8.4
|
8.04
|
1
|
2.7
|
1.2
|
1.51
|
1.26
|
1.2
|
9.5
|
1.9
|
1.6
|
1.75
|
6~40
|
M5
|
0.8
|
1.6
|
38
|
10.4
|
9.3
|
8.94
|
1.2
|
2.7
|
1.2
|
1.51
|
1.26
|
1.2
|
9.5
|
2.4
|
2.0
|
2
|
8~50
|
M6
|
1
|
2
|
38
|
12.6
|
11.3
|
10.87
|
1.4
|
3.3
|
1.6
|
1.91
|
1.66
|
1.6
|
12
|
2.8
|
2.4
|
2.5
|
8~60
|
M8
|
1.25
|
2.5
|
38
|
17.3
|
15.8
|
15.37
|
2
|
4.65
|
2
|
2.31
|
2.06
|
2
|
16.5
|
3.7
|
3.2
|
3.2
|
10~80
|
M10
|
1.5
|
3
|
38
|
20
|
18.3
|
17.78
|
2.3
|
5
|
2.5
|
2.81
|
2.56
|
2.5
|
19.5
|
4.4
|
3.8
|
3.8
|
12~80
|
注:1)尽可能不采用括号内的规格。
2)P—螺距。
3)见GB/T 5279。
l的范围:
公称
|
2.5
|
3
|
4
|
5
|
6
|
8
|
10
|
12
|
(14)
|
16
|
20
|
25
|
30
|
35
|
40
|
45
|
50
|
(55)
|
min
|
2.3
|
2.8
|
3.76
|
4.76
|
5.76
|
7.71
|
9.71
|
11.65
|
13.65
|
15.65
|
19.58
|
24.58
|
29.58
|
34.5
|
39.5
|
44.5
|
49.5
|
54.05
|
max
|
2.7
|
3.2
|
4.24
|
5.24
|
6.24
|
8.29
|
10.29
|
12.35
|
14.35
|
16.35
|
20.42
|
25.42
|
30.42
|
35.5
|
40.5
|
45.5
|
50.5
|
55.95
|
公称
|
60
|
(65)
|
70
|
(75)
|
80
|
min
|
59.05
|
64.05
|
69.05
|
74.05
|
79.05
|
max
|
60.95
|
65.95
|
70.95
|
75.95
|
80.95
|