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THREADING
CROSS REFERENCE THREAD PITCH (EXTERNAL)
Application General machining Pipe fittings and couplings
for gas and water
Type Partial Profile Partial Profile ISO Metric American Parallel American
60° 55° UN Pipe Thread NPT
1/8P 1/8P Whitworth 30° 30°
60° 55° 60° 60° for BSW, BSP
R=0.137P
55°
THREADING 1/4P 1/4P R=0.137P
90°
1°47'SymbolPitchMWMUNCGNPT
UNC mm UNF Rp
Holder UNF thread/inch 0.5 5.0 W thread/inch
mm 0.5 5.0 thread/inch
MMT Holder 0.25 4.5 thread/inch 27, 18, 14
(thread/inch) 48 5 32 5 11.5, 8
20 9 0.25 2.0 48 5 28 5
Full 64 6
form
48 13
Partial 0.5 5.0
^ G012 form (48 5)
MT Holder 0.25 4.5
(64 6)
Partial
form
^ G022 0.25 2.0
(48 13)
SMG Holder
Partial
form
^ G024
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