Collection: Polypropylene Threaded Fittings
Commonly in low pressure irrigation systems. Polypropylene is a relatively soft material.
BSP thread sizes are based on the nominal inside diameter (ID) of the pipe on which they are used. This causes much confusion when the thread is measured. Particularly where metric conversion is concerned.
The Chart below is utilised by measuring the (male) thread at its widest point.
| METRIC SIZE mm | IMPERIAL SIZE (BSP) inch | MEASURED OD in mm |
| 6 | 1/8 | 9.73 |
| 8 | 1/4 | 13.6 |
| 10 | 3/8 | 16.66 |
| 15 | 1/2 | 20.99 |
| 20 | 3/4 | 26.44 |
| 25 | 1 | 33.25 |
| 32 | 1-1.4 | 41.91 |
| 40 | 1-1/2 | 47.80 |
| 50 | 2 | 59.61 |
| 65 | 2-1/2 | 75.18 |
| 70/80 | 3 | 87.88 |
| 100 | 4 | 113.03 |
| 125 | 5 | 138.43 |
| 150 | 6 | 163.83 |
