- This page provided the thread dimensions of 1/16 - 27 NPTF
- NPTF stands for National Pipe Thread Fuel, based on ASTM B1.20.3.
- It is also called Dryseal Pipe Thread.
- It is a variation of the more popular NPT thread standard based on ASTM B1.20.1.
- Learn more about NPTF and the difference between NPTF and NPT
1/16 - 27 NPTF - External Basic Thread Dimensions
For interpertations of the terms scroll down to the drawings below the table
| Property | Inch | mm |
|---|---|---|
| Nominal Pipe Size(∅) | 1/16 | |
| Pipe Outside Diameter (D) | 0.313 | 7.94 |
| Fitting Outside Diameter (D2) | 0.315 | 8 |
| Pitch - TPI (P) | 27 | ... |
| Pitch - Distance (P) | 0.037037 | 0.9407 |
| Thread Tapper Angle (β) | 1.7893 ° | |
| Thread V half Angle (α) | 30 ° | |
| Height of sharp V (H) | 0.032080 | 0.815 |
| Thread Height (h) | 0.02513 | 0.638 |
| Root Truncation (fr) | 0.00435 | 0.11 |
| Crest Truncation (fc) | 0.0026 | 0.066 |
| End of Thread Pitch Diameter (E0) | 0.27118 | 6.888 |
| Hand-Tight Engagement Length (L1) | 0.16000 | 4.064 |
| Pitch Diameter at L1 plane (E1) | 0.28118 | 7.142 |
| Length of Last usefull Thread (L2) | 0.26110 | 6.632 |
| Pitch Diameter at L2 plane (E2) | 0.28750 | 7.303 |
| Overall Thread Length (L2 + 3P) | 0.37500 | 9.525 |
| Length of Vanish threads (V) | 0.11390 | 2.893 |
1/16 - 27 NPTF - External Thread Drawing
Overview Drawing
Profile Drawing
1/16 - 27 NPTF - Internal Basic Thread Dimensions
For interpertations of the terms scroll down to the drawings below the table
| Property | Inch | mm |
|---|---|---|
| Nominal Pipe Size(∅) | 1/16 | |
| Pitch - TPI (P) | 27 | ... |
| Pitch - Distance (P) | 0.037037 | 0.9407 |
| Thread Tapper Angle (β) | 1.7893 ° | |
| Thread V half Angle (α) | 30 ° | |
| Height of sharp V (H) | 0.3150 | 0.941 |
| Thread Height (h) | 0.02513 | 0.638 |
| Root Truncation (fr) | 0.00435 | 0.11 |
| Crest Truncation (fc) | 0.0026 | 0.066 |
| Pitch Diameter at the end of the thread (E1) | 0.28118 | 7.142 |
| Hand-Tight Engagement Length (L1) | 0.16000 | 4.064 |
| Length of Wrenching Allowance (L3) | 0.11110 | 2.822 |
| Pitch Diameter at L3 plane (E3) | 0.26420 | 6.711 |
| Ideal Tap Drill Size | 0.24050 | 6.109 |
| Nearest standard Inch drill | C (0,242) |
1/16 - 27 NPTF - Internal Thread Drawing
Overview Drawing
Profile Drawing
1/16 - 27 NPTF - Tolerances
| Property | Minimum | Maximum |
|---|---|---|
| Thread Height (h) | 0.023380" (0.594 mm) | 0.026880" (0.683 mm) |
| Root Truncation (fr) | 0.00350" (0.089 mm) | 0.00520" (0.132 mm) |
| Crest Truncation (fc) | 0.00170" (0.043 mm) | 0.00350" (0.089 mm) |
| Tapper Angle (β) | 1.643° | 1.934° |
| Thread Head half Angle (α) | 27.5° | 32.5° |
* All other dimensions can be controlled only with gauges.
