Threading Tools Selection Guide ■ Internal Threading
Applications
Pipe Couplings for Gas, Water and Water Faucets
Pipe Threads for Steam, Gas and Water Supply Pipes
Aerospace Equipment
General Industrial Use
Internal Thread
Internal Thread
Internal Thread
Internal Thread
Internal Thread
Internal Thread
Internal Thread
Internal Thread
Internal Thread
F
1˚47'
1˚47'
1˚47'
60°
55°
60°
55° Pitch
55° Pitch
Pitch 60°
Pitch 60°
Pitch 60°
Pitch 60°
Pitch
Pitch
Pitch
External Thread
External Thread
External Thread
External Thread
External Thread
External Thread
External Thread
External Thread
External Thread
60° General-purpose Thread
55° General-purpose Thread (Whitworth)
55° Parallel Thread for Pipe/Whitworth
55° Taper Thread for Pipe BSPT
Type
60° Uni ed Thread
60° American NPT
60° ISO Metric Thread
60° American NPTF
60° UNJ
M
W
NPT
R/Rc
NPTF
UNJ
G/Rp/W
M
UNC/UNF
Symbol
UNC/UNF
mm Threads/Inch
Threads/Inch
mm
Threads/Inch
Threads/Inch
Threads/Inch
Threads/Inch
Threads/Inch
Threads/Inch
Pitch
No
No
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Wiper Edge
32, 28, 24 20, 18, 16 14, 13, 12 10, 8
0.50 to 3.00
0.75, 1.00, 1.25 1.50, 1.75, 2.00 2.50, 3.00
32, 28, 24 20, 18, 16 14, 12, 10
28, 24 20, 19
27, 18, 14 11.5, 8
27, 18, 14 11.5, 8
48 to 8
28, 19
48 to 8
SSTI
1.00 to 3.00
1.00, 1.25, 1.50 1.75, 2.00, 2.50 3.00
—
— — — — — —
24 to 8
STI
0.40 to 1.00
— — — — — — — —
STHI
0.80 to 2.50
1.50, 2.00
—
— — — — — —
THI
F70
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