内六角花形盘头螺钉 (摘自GB 2672-86)
螺纹规格为M6~12的内六角花形盘头螺钉。
标记示例:
螺纹规格d=M6、公称长度l=20mm、性能等级为4.8级、不经表面处理的内六角花形盘头螺钉的标记:
螺钉 GB 2672 M6×20
螺纹规格为M6~12的内六角花形盘头螺钉:
螺纹规格
d
|
P
|
a
max
|
b
min
|
da
max
|
dk
|
K
|
r
min
|
rf ≈
|
X
|
六角花形
|
l
|
代号
|
t
|
B
|
max
|
min
|
max
|
min
|
max
|
min
|
M6
|
1
|
2
|
38
|
6.8
|
12
|
11.57
|
4.6
|
4.30
|
0.25
|
10
|
2.5
|
T30
|
2
|
1.6
|
4.15
|
8~60
|
M8
|
1.25
|
2.5
|
38
|
9.2
|
16
|
15.57
|
6
|
5.70
|
0.4
|
13
|
3.2
|
T40
|
2.6
|
2.2
|
5
|
10~80
|
M10
|
1.5
|
3
|
38
|
11.2
|
20
|
19.48
|
7.5
|
7.14
|
0.4
|
16
|
3.8
|
T50
|
3
|
2.6
|
6.62
|
12~80
|
M12
|
1.75
|
3.5
|
48
|
14.2
|
24
|
23.48
|
9
|
8.64
|
0.6
|
19
|
4.3
|
T55
|
3.8
|
3.22
|
8.2
|
20~80
|
l的范围:
公称
|
8
|
10
|
12
|
(14)
|
16
|
20
|
25
|
30
|
35
|
40
|
45
|
50
|
(55)
|
60
|
70
|
80
|
min
|
7.71
|
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
|
69.4
|
79.4
|
max
|
8.29
|
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
|
70.6
|
80.6
|