External (pipe) Basic Thread Dimensions
For interpertations of the terms scroll down to the drawings below the table
| Property | Inch | mm |
|---|---|---|
| Nominal Pipe Size (Ø) | 3/4" | ... |
| Pipe Outside Diameter (D) | 1.05 | 26.67 |
| Pitch (TPI) (P) | 14.000 | 355.6 |
| Pitch (Distance) (P) | 0.07142857 | 1.814 |
| Thread Tapper Angle (ß) | 1.7893° | 1.7893° |
| Thread V half Angle (α) | 30° | 30° |
| Height of sharp V (H) | 0.061859 | 1.571 |
| Thread height (h) | 0.05714 | 1.451 |
| Pitch Diameter at the Pipe's end (E0) | 0.96768 | 24.579 |
| Minor Diameter at the Pipe's end (K0) | 0.9105 | 23.127 |
| Hand-Tight Engagement Length (L1) | 0.339 | 8.611 |
| Pitch Diameter at L1 plane (E1) | 0.98887 | 25.117 |
| Length of Last Complete Thread (L5) | 0.4029 | 10.234 |
| Pitch Diameter at L5 plane (E5) | 0.99286 | 25.219 |
| Length of Last usefull Thread (L2) | 0.5457 | 13.861 |
| Pitch Diameter at L2 plane (E2) | 1.00179 | 25.445 |
| Overall Thread Length (L4) | 0.7935 | 20.155 |
| Length of Vanish threads (V) | 0.2478 | 6.294 |
3/4-14 NPT - External (pipe) Drawing
Overview Drawing
Profile Drawing
3/4-14 NPT - Internal (Fitting) Basic Thread Dimensions
For interpertations of the terms scroll down to the drawings below the table
| Property | Inch | mm |
|---|---|---|
| Nominal Pipe Size (Ø) | 3/4" | ... |
| Pipe Outside Diameter (D) | 1.05 | 26.67 |
| Pitch (TPI) (P) | 14.000 | 355.6 |
| Pitch (Distance) (P) | 0.07142857 | 1.814 |
| Thread Tapper Angle (ß) | 1.7893° | 1.7893° |
| Thread V half Angle (α) | 30° | 30° |
| Height of sharp V (H) | 0.061859 | 1.571 |
| Thread height (h) | 0.05714 | 1.451 |
| Pitch Diameter at the fitting's end (E1) | 0.98887 | 25.117 |
| Length of Hand-Tight Engagemen (L1) | 0.339 | 8.611 |
Length of Wrenching Allowance (L3) |
0.2143 | 5.443 |
| Pitch Diameter at L3 plane (E3) | 0.95492 | 24.255 |
| Tap Drill Size (T) | 0.7813 | 19.845 |
3/4-14 NPT - Internal (Fitting) Drawing
Overview Drawing
Profile Drawing
3/4-14 NPT - Tolerances
| Property | Minimum | Maximum |
|---|---|---|
| Thread Height (h) | 0.05072" (1.288 mm) | 0.05714" (1.451 mm) |
| L1 gage Tolerance (+/- 1 Turn) (L1) | ... | 0.07143" (1.814 mm) |
| Thread Truncation (f) | 0.0024" (0.061 mm) | 0.0056" (0.142 mm) |
| Tapper angle Variation (ß) | 1.641" ( ) | 2.089" ( ) |
| Thead V Half Angle (+/-) (α) | ... | 1" ( ) |
| Thread Height (h) | " (0 mm) | " (0 mm) |
| L1 gage Tolerance (+/- 1 Turn) (L1) | " ( ) | " ( ) |
| Thread Truncation (f) | " (0 mm) | " (0 mm) |
| Tapper angle Variation (ß) | " ( ) | " ( ) |
| Thead V Half Angle (+/-) (α) | " ( ) | " ( ) |
