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British ISO Metric Screw Threads Designations 

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Diameter & Pitch defined by BS 3643:Part 1:1981 (1998)

All dimensions are in millimeters.

Nominal Diameter
Coarse Pitch
Fine Pitch
Pitch
Nominal Diameter
Pitch
1
0.25
0.2
-
70
6, 4, 3, 2, 1.5
1.1
0.25
0.2
-
72
6, 4, 3, 2, 1.5
1.2
0.25
0.2
-
75
4, 3, 2, 1.5
1.4
0.3
0.2
-
76
6, 4, 3, 2, 1.5
1.6
0.35
0.2
-
78
2
1.8
0.35
0.2
-
80
6, 4, 3, 2, 1.5
2.0
0.4
0.25
-
82
2
2.2
0.45
0.25
-
85
6, 4, 3, 2
2.5
0.45
0.35
-
90
6, 4, 3, 2
3
0.5
0.35
-
95
6, 4, 3, 2
3.5
0.6
0.35
-
100
6, 4, 3, 2
4
0.7
0.5
-
105
6, 4, 3, 2
4.5
0.75
0.5
-
110
6, 4, 3, 2
5
0.8
0.5
-
115
6, 4, 3, 2
5.5
-
0.5
-
120
6, 4, 3, 2
6
1
0.75
-
125
6, 4, 3, 2
7
1
0.75
-
130
6, 4, 3, 2
8
1.25
1
0.75
135
6, 4, 3, 2
9
1.25
-
1, 0.75
140
6, 4, 3, 2
10
1.5
1.25
1, 0.75
145
6, 4, 3, 2
11
1.5
-
1, 0.75
150
6, 4, 3, 2
12
1.75
1.25
1.5, 1
155
6, 4, 3
14
2
1.5
1.25a, 1
160
6, 4, 3
15
-
-
1.5, 1
165
6, 4, 3
16
2
1.5
1
170
6, 4, 3
17
-
-
1.5, 1
175
6, 4, 3
18
2.5
1.5
2, 1
180
6, 4, 3
20
2.5
1.5
2, 1
185
6, 4, 3
22
2.5
1.5
2, 1
190
6, 4, 3
24
3
2
1.5, 1
195
6, 4, 3
25
-
-
2, 1.5, 1
200
6, 4, 3
26
-
-
1.5
205
6, 4, 3
27
3
2
1.5, 1
210
6, 4, 3
28
-
-
2, 1.5, 1
215
6, 4, 3
30
3.5
2
3 , 1.5, 1
220
6, 4, 3
32
-
2, 1.5
225
6, 4, 3
33
3.5
2
3 , 1.5
230
6, 4, 3
35
-
-
1.5
235
6, 4, 3
36
4
-
3, 2, 1.5
240
6, 4, 3
38
-
1.5
245
6, 4, 3
39
4
-
3, 2, 1.5
250
6, 4, 3
40
-
-
3, 2, 1.5
255
6, 4
42
4.5
-
4, 3, 2, 1.5
260
6, 4
45
4.5
-
4, 3, 2, 1.5
260
6, 4
48
5
-
4, 3, 2, 1.5
265
6, 4
50
-
-
3, 2, 1.5
270
6, 4
52
5
-
4, 3, 2, 1.5
275
6, 4
55
-
-
4, 3, 2, 1.5
280
6, 4
56
5.5
-
4, 3, 2, 1.5
285
6, 4
58
-
-
4, 3, 2, 1.5
290
6, 4
60
5.5
-
4, 3, 2, 1.5
295
6, 4
62
-
-
4, 3, 2, 1.5
300
6, 4
64
6
-
4, 3, 2, 1.5
65
-
-
4, 3, 2, 1.5
68
6
-
4, 3, 2, 1.5

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