NPTF
NPT (National Pipe Thread) is often confused with BSPT, due to it being a tapered thread, especially in sizes such as 1/2’’ where they share the same TPI. We manufacture to NPTF (National Standard Pipe Thread Fuel) which is designed to seal without the use of PTFE tape.
NPTF Pressure Ratings and Torque Values
| Dashsize | Thread Size | Working pressure | Tightening | |||
|---|---|---|---|---|---|---|
| Mpa | bar | psi | Nm | Turns past finger tight | ||
| -02 | 1/8 | 34.5 | 345 | 5000 | 40 | 1.5 > 3.0 |
| -04 | 1/4 | 27.5 | 275 | 4000 | 45 | 1.5 > 3.0 |
| -06 | 3/8 | 21 | 210 | 3000 | 60 | 1.5 > 3.0 |
| -08 | 1/2 | 21 | 210 | 3000 | 70 | 1.5 > 3.0 |
| -12 | 3/4 | 17.5 | 175 | 2500 | 75 | 1.5 > 3.0 |
| -16 | 1 | 14 | 140 | 2000 | 90 | 1.0 > 2.5 |
| -20 | 1-1/4 | 8 | 80 | 1150 | 110 | 1.0 > 2.5 |
| -24 | 1-1/2 | 7 | 70 | 1000 | 130 | 1.0 > 2.5 |
| -32 | 2 | 7 | 70 | 1000 | 160 | 1.0 > 2.5 |
DESIGN DETAILS AND SPECIFICATIONS SUBJECT TO CHANGE WITHOUT PRIOR NOTICE – Whilst every effort has been made to ensure the accuracy of the information supplied herein, Burnett & Hillman cannot be held responsible for any errors or omissions (E&OE). Working pressures quoted are taken from the relevant standard and are provided as a guide only.
