PIPE / PIPE THREAD DIMENSIONS
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Nominal Pipe sizes do not match any of its actual physical dimensions.
The OD of pipe / fitting must be measured compared to the
table for identification.
For example, a 1/4" NPT pipe thread has an outside diameter of .540
inches. |
 |
Male
threads:
Measure the outside diameter of the large portion of the thread "A"
Find figure nearest this dimension in Fractions or Decimal.
The nominal pipe thread size is in the left column. |
Female Threads:
Measure top diameter of thread at
"B"
Find figure nearest this dimension in Fractions or Decimal.
The nominal pipe thread size is in the left column.
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|
Pipe Size
Nominal
|
OD A or B
Fraction Inch
|
OD A or B
Actual Decimal Inch |
| 1/16 |
5/16 |
0.3125 |
| 1/8 |
13/32 |
0.405 |
| 1/4 |
35/64 |
0.540 |
| 3/8 |
43/64 |
0.675 |
| 1/2 |
27/32 |
0.840 |
| 3/4 |
1-3/64 |
1.050 |
| 1 |
1-5/16 |
1.315 |
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