Pipe Taper and Straight Thread Dimensions
•National Pipe Taper and Straight Thread Dimensions
| NPT Size | Threads Per Inch |
Dim "A" (In.) |
Dim "B" (In.) |
| 1/16 | 27 | .312 | .261 |
| 1/8 | 27 | .405 | .264 |
| 1/4 | .540 | .402 | |
| 3/8 | 18 | .675 | .408 |
| 1/2 | 14 | .840 | .534 |
| 3/4 | 14 | 1.050 | .546 |
| 1 | 111/2 | 1.315 | .683 |
| 11/4 | 111/2 | 1.660 | .707 |
|
Nominal
Thread Size |
Threads Per Inch
|
Major
Diameter |
W
|
H
|
L
|
|
| Coarse (UNC) |
Fine
(UNF) |
|||||
| 0 | - | 80 | 0.0600 | |||
| 1 | 64 | 72 | 0.0730 | |||
| 2 | 56 | 64 | 0.0860 | |||
| 3 | 48 | 56 | 0.0990 | |||
| 4 | 40 | 48 | 0.1221 | |||
| 5 | 40 | 44 | 0.1250 | |||
| 6 | 32 | 40 | 0.1380 | |||
| 8 | 32 | 36 | 0.1640 | |||
| 10 | 24 | 32 | 0.1900 | |||
| 12 | 24 | 28 | 0.2160 | |||
| 1/4 | 20 | 28 | 0.2500 | 7/16 | 11/64 | 0.750 |
| 5/16 | 18 | 24 | 0.3125 | 1/2 | 7/32 | 0.875 |
| 3/8 | 16 | 24 | 0.3750 | 9/16 | 1/4 | 1.000 |
| 7/16 | 14 | 20 | 0.4375 | 5/8 | 19/64 | 1.125 |
| 1/2 | 13 | 20 | 0.5000 | 3/4 | 11/32 | 1.250 |
| 9/16 | 12 | 18 | 0.5625 | 13/16 | 3/8 | 1.375 |
| 5/8 | 11 | 18 | 0.6250 | 15/16 | 27/64 | 1.500 |
| 3/4 | 10 | 16 | 0.7500 | 11/8 | 1/2 | 1.750 |
| 7/8 | 9 | 14 | 0.8750 | 15/16 | 37/64 | 2.000 |
| 1 | 8 | 12 | 1.0000 | 11/2 | 43/64 | 2.250 |
| 11/8 | 7 | 12 | 1.1250 | 111/16 | 3/4 | 2.500 |
| 11/4 | 7 | 12 | 1.2500 | 17/8 | 27/32 | 2.750 |
| 13/8 | 6 | 12 | 1.3750 | 21/16 | 29/32 | 3.000 |
| 11/2 | 6 | 12 | 1.5000 | 21/4 | 1 | 3.250 |
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