Wrought Iron Pipe Characteristics (USA)

Wrought Iron Pipe is used for water supply in older houses.  It comes in either "Black" or "Galvanized".  Joints are made by threading pipe into cast iron fittings.  Unlike screw threads, pipe threads are tapered.

Nominal
Pipe
Size
 O.D.
(inches)
 I.D.
(inches)
 Wall
Thickness
(inches)
 Thread
TPI
1/4"
 .0540
 0.364
 0.088
 18
3/8"
 0.675
 0.493
 0.091
 18
1/2"
 0.840
 0.622
 0.109
 14
3/4"
 1.050
 0.824
 0.113
 14
1"
 1.315
 1.049
 0.133
 11.5
1-1/4"
 1.660
 1.380
 0.140
 11.5
1-1/2"
 1.900
 1.610
 0.145
 11.5
2"
 2.375
 2.067
 0.154
 11.5
2-1/2"
 2.875
 2.468
 0.204
 8

3/8" iron pipe is 5/8" O.D. making a substitute for 5/8" rod (along with 1/2" copper pipe).  1/2" copper pipe couplings make fair bushings for 3/8" iron pipe shafts.
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