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) | 1 1/4" | ... |
| Pipe Outside Diameter (D) | 1.66 | 42.164 |
| Pitch (TPI) (P) | 11.500 | 292.1 |
| Pitch (Distance) (P) | 0.08695652 | 2.209 |
| Thread Tapper Angle (ß) | 1.7893° | 1.7893° |
| Thread V half Angle (α) | 30° | 30° |
| Height of sharp V (H) | 0.075307 | 1.913 |
| Thread height (h) | 0.06957 | 1.767 |
| Pitch Diameter at the Pipe's end (E0) | 1.55713 | 39.551 |
| Minor Diameter at the Pipe's end (K0) | 1.4876 | 37.785 |
| Hand-Tight Engagement Length (L1) | 0.42 | 10.668 |
| Pitch Diameter at L1 plane (E1) | 1.58338 | 40.218 |
| Length of Last Complete Thread (L5) | 0.5329 | 13.536 |
| Pitch Diameter at L5 plane (E5) | 1.59043 | 40.397 |
| Length of Last usefull Thread (L2) | 0.7068 | 17.953 |
| Pitch Diameter at L2 plane (E2) | 1.6013 | 40.673 |
| Overall Thread Length (L4) | 1.0085 | 25.616 |
| Length of Vanish threads (V) | 0.3017 | 7.663 |
1 1/4-11.5 NPT - External (pipe) Drawing
Overview Drawing
Profile Drawing
1 1/4-11.5 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) | 1 1/4" | ... |
| Pipe Outside Diameter (D) | 1.66 | 42.164 |
| Pitch (TPI) (P) | 11.500 | 292.1 |
| Pitch (Distance) (P) | 0.08695652 | 2.209 |
| Thread Tapper Angle (ß) | 1.7893° | 1.7893° |
| Thread V half Angle (α) | 30° | 30° |
| Height of sharp V (H) | 0.075307 | 1.913 |
| Thread height (h) | 0.06957 | 1.767 |
| Pitch Diameter at the fitting's end (E1) | 1.58338 | 40.218 |
| Length of Hand-Tight Engagemen (L1) | 0.42 | 10.668 |
Length of Wrenching Allowance (L3) |
0.2609 | 6.627 |
| Pitch Diameter at L3 plane (E3) | 1.54083 | 39.137 |
| Tap Drill Size (T) | 1.4844 | 37.704 |
1 1/4-11.5 NPT - Internal (Fitting) Drawing
Overview Drawing
Profile Drawing
1 1/4-11.5 NPT - Tolerances
| Property | Minimum | Maximum |
|---|---|---|
| Thread Height (h) | 0.06261" (1.59 mm) | 0.06957" (1.767 mm) |
| L1 gage Tolerance (+/- 1 Turn) (L1) | ... | 0.08696" (2.209 mm) |
| Thread Truncation (f) | 0.0029" (0.074 mm) | 0.0063" (0.16 mm) |
| Tapper angle Variation (ß) | 1.641" ( ) | 2.089" ( ) |
| Thead V Half Angle (+/-) (α) | ... | 0.75" ( ) |
| 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) | " ( ) | " ( ) |
