双头螺柱 bm=2d (摘自GB 900-88)
螺纹规格为M2~M48、bm=2d的双头螺柱。
标记示例:
两端均为粗牙普通螺纹,d=10mm、l=50mm、性能等级为4.8级、不经表面处理、B型、bm=2d的双头螺柱的标记:
螺柱 GB 900 M10×50
旋入机体一端为粗牙普通螺纹,旋螺母一端为螺距P=1mm的细牙普通螺纹,d=10mm、l=50mm、性能等级为4.8级、不经表面处理、A型、bm=2d的双头螺柱的标记:
螺柱 GB 900 AM10-M10×1×50
旋入机体一端为过盈配合螺纹,旋螺母一端为粗牙普通螺纹,d=10mm、l=50mm、性能等级为8.8级、镀锌钝化、A型、bm=2d的双头螺柱的标记:
螺柱 GB 900 AYM10-M10×50-8.8-Zn·D
螺纹规格为M2~M48、bm=2d的双头螺柱:
螺纹规格
d
|
bm
|
ds
|
X
|
l
|
b
|
公称
|
min
|
max
|
max
|
min
|
max
|
M2
|
4
|
3.40
|
4.60
|
2
|
1.75
|
2.5
|
12~25
|
6~10
|
M2.5
|
5
|
4.40
|
5.60
|
2.5
|
2.25
|
2.5
|
14~30
|
8~11
|
M3
|
6
|
5.40
|
6.60
|
3
|
2.75
|
2.5
|
16~40
|
6~12
|
M4
|
8
|
7.25
|
8.75
|
4
|
3.7
|
2.5
|
16~40
|
8~14
|
M5
|
10
|
9.25
|
10.75
|
5
|
4.7
|
2.5
|
16~50
|
10~16
|
M6
|
12
|
11.10
|
12.90
|
6
|
5.7
|
2.5
|
20~75
|
10~18
|
M8
|
16
|
15.10
|
16.90
|
8
|
7.64
|
2.5
|
20~90
|
12~22
|
M10
|
20
|
18.95
|
21.05
|
10
|
9.64
|
2.5
|
25~130
|
14~32
|
M12
|
24
|
22.95
|
25.05
|
12
|
11.57
|
2.5
|
25~180
|
16~36
|
M14
|
28
|
26.95
|
29.05
|
14
|
13.57
|
2.5
|
30~180
|
18~40
|
M16
|
32
|
30.75
|
33.25
|
16
|
15.57
|
2.5
|
30~200
|
20~44
|
M18
|
36
|
34.75
|
37.25
|
18
|
17.57
|
2.5
|
35~200
|
22~48
|
M20
|
40
|
38.75
|
41.25
|
20
|
19.48
|
2.5
|
35~200
|
25~52
|
M22
|
44
|
42.75
|
45.25
|
22
|
21.48
|
2.5
|
40~200
|
30~56
|
M24
|
48
|
46.75
|
49.25
|
24
|
23.48
|
2.5
|
45~200
|
30~60
|
M27
|
54
|
52.5
|
55.5
|
27
|
26.48
|
2.5
|
50~200
|
35~66
|
M30
|
60
|
58.5
|
61.5
|
30
|
29.48
|
2.5
|
60~250
|
40~85
|
M33
|
66
|
64.5
|
67.5
|
33
|
32.38
|
2.5
|
65~300
|
45~91
|
M36
|
72
|
70.5
|
73.5
|
36
|
35.38
|
2.5
|
65~300
|
45~97
|
M39
|
78
|
76.5
|
79.5
|
39
|
38.38
|
2.5
|
70~300
|
50~103
|
M42
|
84
|
82.25
|
85.75
|
42
|
41.38
|
2.5
|
70~300
|
50~109
|
M48
|
96
|
94.25
|
97.75
|
48
|
47.38
|
2.5
|
80~300
|
60~121
|
注:(1)尽可能不采用括号内的规格。
(2)P—粗牙螺距。
(3)当b—bm≤5mm时,螺旋母一端应制成倒圆端,或在端面中心制出凹点。
(4)允许采用细牙螺纹、过渡及过盈配合螺纹。
l的范围:
公称
|
12
|
(14)
|
16
|
(18)
|
20
|
(22)
|
25
|
(28)
|
30
|
(32)
|
35
|
(38)
|
40
|
45
|
50
|
min
|
11.10
|
13.10
|
15.10
|
17.10
|
18.95
|
20.95
|
23.95
|
26.95
|
28.95
|
30.75
|
33.75
|
36.75
|
38.75
|
43.75
|
48.75
|
max
|
12.90
|
14.90
|
16.90
|
18.90
|
21.05
|
23.05
|
26.05
|
29.05
|
31.05
|
33.25
|
36.25
|
39.25
|
41.25
|
46.25
|
51.25
|
公称
|
(55)
|
60
|
(65)
|
70
|
(75)
|
80
|
(85)
|
90
|
(95)
|
100
|
110
|
120
|
130
|
140
|
150
|
min
|
53.5
|
58.5
|
63.5
|
68.5
|
73.5
|
78.5
|
83.25
|
88.25
|
93.25
|
98.25
|
108.25
|
118.25
|
128
|
138
|
148
|
max
|
56.5
|
61.5
|
66.5
|
71.5
|
76.5
|
81.5
|
86.75
|
91.75
|
96.75
|
101.75
|
111.75
|
121.75
|
132
|
142
|
152
|
公称
|
160
|
170
|
180
|
190
|
200
|
210
|
220
|
230
|
240
|
250
|
260
|
280
|
300
|
min
|
158
|
168
|
178
|
187.7
|
197.7
|
207.7
|
217.7
|
227.7
|
237.7
|
247.7
|
257.4
|
277.4
|
297.4
|
max
|
162
|
172
|
182
|
192.3
|
202.3
|
212.3
|
222.3
|
232.3
|
242.3
|
252.3
|
262.6
|
282.6
|
302.6
|