Type of thread

No. of Threads
(threads/inch)

Type of gauge

Class

PF1/8

28

GPIP(for inspection)


GPWP(for work)

A


B

PF1/4

19

PF3/8

19

PF1/2

14

PF5/8

14

PF3/4

14

PF7/8

14

PF1

11

PF1 1/8

11

PF1 1/4

11

PF1 1/2

11

PF1 3/4

11

PF2

11

Type of thread

No. of Threads
(threads/inch)

Type of gauge

Class

G1/16

28

GPNP

N/A

G1/8

28

G1/4

19

G3/8

19

G1/2

14

G3/4

14

G7/8

14

G1

11

G1 1/8

11

G1 1/4

11

G1 1/2

11

G1 3/4

11

G2

11