28 January 2014
There are many different thread standards used in the engineering industry but by far the most common in Australia and any former Commonwealth Country is BSP (British Standard Pipe). In this post we will help you identify what size thread you have.
A common mistake is to simply measure the inside diameter of the pipe and assume that this measurement will be the thread size you are after. For example if you measure 25mm you may think that this is 1″ BSP but in fact it is really 3/4″ BSP as this measurement fits between the major and minor diameter for this size. You really need to think of the thread size required as the ‘trade size’ as this is what the thread is known as in the industry (not a direct correlation to the size you measure). I have copied a thread size table off our web page (https://www.valvesonline.com.au/references/threads) to help you establish what size thread you have. If you measure the id of your pipe find where that measurement falls between the minor and major diameter. This is then your size (All dimensions in mm).
|
Trade Size (BSP) |
Pitch
|
Major Diameter
|
Minor Diameter
|
Gage Length
|
|
1/8 |
0.907 |
9.728 |
8.565 |
3.97 |
|
1/4 |
1.337 |
13.157 |
11.445 |
6.012 |
|
3/8 |
1.337 |
16.662 |
14.95 |
6.35 |
|
1/2 |
1.814 |
20.955 |
18.633 |
8.164 |
|
3/4 |
1.814 |
26.441 |
24.12 |
9.525 |
|
1 |
2.309 |
33.249 |
30.292 |
10.391 |
|
1 ¼ |
2.309 |
41.91 |
38.953 |
12.7 |
|
1 ½ |
2.309 |
47.803 |
44.846 |
12.7 |
|
2 |
2.309 |
59.614 |
56.657 |
15.875 |
|
2 ½ |
2.309 |
75.184 |
72.227 |
17.463 |
|
3 |
2.309 |
87.884 |
84.927 |
20.638 |
|
4 |
2.309 |
113.03 |
110.073 |
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There are many different thread standards used in the engineering industry but by far the most common in Australia and any former Commonwealth Country is BSP (British Standard Pipe). In this post we will help you identify what size thread you have.
A common mistake is to simply measure the inside diameter of the pipe and assume that this measurement will be the thread size you are after. For example if you measure 25mm you may think that this is 1″ BSP but in fact it is really 3/4″ BSP as this measurement fits between the major and minor diameter for this size. You really need to think of the thread size required as the ‘trade size’ as this is what the thread is known as in the industry (not a direct correlation to the size you measure). I have copied a thread size table off our web page (https://www.valvesonline.com.au/references/threads) to help you establish what size thread you have. If you measure the id of your pipe find where that measurement falls between the minor and major diameter. This is then your size (All dimensions in mm).
|
Trade Size (BSP) |
Pitch
|
Major Diameter
|
Minor Diameter
|
Gage Length
|
|
1/8 |
0.907 |
9.728 |
8.565 |
3.97 |
|
1/4 |
1.337 |
13.157 |
11.445 |
6.012 |
|
3/8 |
1.337 |
16.662 |
14.95 |
6.35 |
|
1/2 |
1.814 |
20.955 |
18.633 |
8.164 |
|
3/4 |
1.814 |
26.441 |
24.12 |
9.525 |
|
1 |
2.309 |
33.249 |
30.292 |
10.391 |
|
1 ¼ |
2.309 |
41.91 |
38.953 |
12.7 |
|
1 ½ |
2.309 |
47.803 |
44.846 |
12.7 |
|
2 |
2.309 |
59.614 |
56.657 |
15.875 |
|
2 ½ |
2.309 |
75.184 |
72.227 |
17.463 |
|
3 |
2.309 |
87.884 |
84.927 |
20.638 |
|
4 |
2.309 |
113.03 |
110.073 |
