TMPG_US-EN

Common Thread Forms

Internal

Internal

Internal

R = .137P

29°

30° 30°

55°

h

90°

R = .137P

1° 47’

External

External

External

ACME (full profile)

API Round

BSPP

Internal

30° 30°

Internal

Internal

R = .137P

R = .137P

27.5° 27.5°

55°

90°

1° 47’

External R = .137P

90°

R = .137P

1° 47’

External

External

BSPT

BSW

NPT / NPTF

Internal

30° 30°

Internal

Internal

1/4P

1/4P

60°

60°

External

1/8P

1/8P UNJC / UNJF

External

External

NPS / NPSF

UNC / UNF

Internal

1/4P

60°

1/8P

External

ISO

THREAD MILLING REFERENCE GUIDE | 25