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 A Full range of Reducers and adapters male 

NPT both sides

in Brass

American National Taper Pipe (N.P.T.)

Dash Size

Nominal
Thread
Size  - t.p.i.
Basic depth
of thread
(in.)
Outside dia.
of pipe (in.)
Effective
diameter
at small
end of
external
thread (in.) 
Basic
Minor
Dia. (in.)
Recommended tap drill size (mm)
-11/16 - 27.0296.3125.2712.28126.30

-2

1/8 - 27.0296.405.3635.37368.70
-41/4 - 18.0444.540.4774.491611.10
-63/8 - 18.0444.675.6120.627014.50
-81/2 - 14.0571.840.7584.778418.00
-123/4 - 14.05711.050.9677.988923.25
-161 - 11-1/2.06961.3151.21361.238629.00
-201 1/4 - 11-1/2.06961.6601.55711.583438.00
-241 1/2 - 11-1/2.06961.9001.79611.822344.00
-322 - 11-1/2.06962.3752.26902.296356.00
-402 1/2 - 8.10002.8752.71952.762267.00
American National Taper Pipe (N.P.T.)
Thread Form

h = Basic Depth of Thread = *8 p

p = Pitch = 1/t.p.i. (Threads per Inch)

Ref. Catalog Page 42 (Chart 3)

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