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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
1
0.25
0.2
-
1.1
0.25
0.2
-
1.2
0.25
0.2
-
1.4
0.3
0.2
-
1.6
0.35
0.2
-
1.8
0.35
0.2
-
2.0
0.4
0.25
-
2.2
0.45
0.25
-
2.5
0.45
0.35
-
3
0.5
0.35
-
3.5
0.6
0.35
-
4
0.7
0.5
-
4.5
0.75
0.5
-
5
0.8
0.5
-
5.5
-
0.5
-
6
1
0.75
-
7
1
0.75
-
8
1.25
1
0.75
9
1.25
-
1, 0.75
10
1.5
1.25
1, 0.75
11
1.5
-
1, 0.75
12
1.75
1.25
1.5, 1
14
2
1.5
1.25a, 1
15
-
-
1.5, 1
16
2
1.5
1
17
-
-
1.5, 1
18
2.5
1.5
2, 1
20
2.5
1.5
2, 1
22
2.5
1.5
2, 1
24
3
2
1.5, 1
25
-
-
2, 1.5, 1
26
-
-
1.5
27
3
2
1.5, 1
28
-
-
2, 1.5, 1
30
3.5
2
3 , 1.5, 1
32
-
2, 1.5
33
3.5
2
3 , 1.5
35
-
-
1.5
36
4
-
3, 2, 1.5
38
-
1.5
39
4
-
3, 2, 1.5
40
-
-
3, 2, 1.5
42
4.5
-
4, 3, 2, 1.5
45
4.5
-
4, 3, 2, 1.5
48
5
-
4, 3, 2, 1.5
50
-
-
3, 2, 1.5
52
5
-
4, 3, 2, 1.5
55
-
-
4, 3, 2, 1.5
56
5.5
-
4, 3, 2, 1.5
58
-
-
4, 3, 2, 1.5
60
5.5
-
4, 3, 2, 1.5
62
-
-
4, 3, 2, 1.5
64
6
-
4, 3, 2, 1.5
65
-
-
4, 3, 2, 1.5
68
6
-
4, 3, 2, 1.5

 

Nominal
Diameter
Pitch
70
6, 4, 3, 2, 1.5
72
6, 4, 3, 2, 1.5
75
4, 3, 2, 1.5
76
6, 4, 3, 2, 1.5
78
2
80
6, 4, 3, 2, 1.5
82
2
85
6, 4, 3, 2
90
6, 4, 3, 2
95
6, 4, 3, 2
100
6, 4, 3, 2
105
6, 4, 3, 2
110
6, 4, 3, 2
115
6, 4, 3, 2
120
6, 4, 3, 2
125
6, 4, 3, 2
130
6, 4, 3, 2
135
6, 4, 3, 2
140
6, 4, 3, 2
145
6, 4, 3, 2
150
6, 4, 3, 2
155
6, 4, 3
160
6, 4, 3
165
6, 4, 3
170
6, 4, 3
175
6, 4, 3
180
6, 4, 3
185
6, 4, 3
190
6, 4, 3
195
6, 4, 3
200
6, 4, 3
205
6, 4, 3
210
6, 4, 3
215
6, 4, 3
220
6, 4, 3
225
6, 4, 3
230
6, 4, 3
235
6, 4, 3
240
6, 4, 3
245
6, 4, 3
250
6, 4, 3
255
6, 4
260
6, 4
260
6, 4
265
6, 4
270
6, 4
275
6, 4
280
6, 4
285
6, 4
290
6, 4
295
6, 4
300
6, 4

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