PARALLEL PIPE THREADS (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, Class B : tolerance class for internal thread

Parallel Pipe Thread (PF) Dimension

Number of threads per inch (TPI) :

n =

0

Pitch :

P =

0

mm

Height of fundamental triangle :

H =

0

mm

Height of thread :

h =

0

mm

Radius at the top and bottom of the threads :

r =

0

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