Parallel Pipe Thread (BSPF PF)
Parallel Pipe Thread (PF) Profile
- Thread form angle : 55°
- P : Pitch
- n : TPI
- H : Height of fundamental triangle
- h : Height of thread
- r : Radius at the top and bottom of the thread
- D : Major diameter of internal thread
- D1 : Minor diameter of internal thread
- D2 : Pitch diameter of internal thread
- d : Major diameter of external thread
- d1 : Minor diameter of external thread
- d2 : Pitch diameter of external thread
Parallel Pipe Thread (PF) Tolerance
- T : Tolerance
- TD1, TD2 : Tolerance for D1, D2
- Td1, Td2 : Tolerance for d1, d2
- ES : Upper deviation of internal thread
- es : Upper deviation of external thread
- EI : Lower deviation of internal thread
- ei : Lower deviation of external thread
- Class A, Class B : tolerance class for external thread
- Class A : tolerance class for internal thread
Parallel Pipe Thread (PF) Dimension
Number of threads per inch (TPI) :
n =
0.000
mm
Pitch :
P =
0.000
mm
Height of fundamental triangle :
H =
0.000
mm
Height of thread :
h =
0.000
mm
Radius at the top and bottom of the threads :
r =
0.000
mm
Major diameter (mm)
0.000
0.000
0.000
=
invalid size
Minor diameter (mm)
0.000
0.000
0.000
=
invalid size
Pitch diameter (mm)
0.000
0.000
0.000
=
invalid size
For not specified tolerance, we use the pitch tolerance to calculate the average value.
Standard Parallel Pipe Thread (PF)
| Size | TPI |
|---|---|
| PF 1/8 | 28 |
| PF 1/4 | 19 |
| PF 3/8 | 19 |
| PF 1/2 | 14 |
| PF 5/8 | 14 |
| PF 3/4 | 14 |
| PF 7/8 | 14 |
| PF 1 | 11 |
| PF 1 1/8 | 11 |
| PF 1 1/4 | 11 |
| PF 1 1/2 | 11 |
| PF 1 3/4 | 11 |
| PF 2 | 11 |
| PF 2 1/4 | 11 |
| PF 2 1/2 | 11 |
| PF 2 3/4 | 11 |
| PF 3 | 11 |
| PF 3 1/2 | 11 |
| PF 4 | 11 |
| PF 4 1/2 | 11 |
| PF 5 | 11 |
| PF 5 1/2 | 11 |
| PF 6 | 11 |
| PF 7 | 11 |
| PF 8 | 11 |
| PF 9 | 11 |
| PF 10 | 11 |
| PF 12 | 11 |