A pipe plug is a type of fitting used to close the end of a pipe or to block the flow of fluid within a pipe system. It typically consists of a cylindrical body with external threads that match the internal threads of the pipe. The plug is threaded into the pipe to create a seal, preventing the flow of liquid or gas through the pipe. Some pipe plugs may also have a square or hexagonal head to facilitate tightening with a wrench or can have a broached hexagonal socket when the plug needs to sit flush.
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| Nominal Pipe Size | Minimum Length, A | Minimum Square Height, B | Minimum Width Flats, C |
| 1/8 | 0.38 | 0.25 | 0.28 |
| 1/4 | 0.44 | 0.25 | 0.38 |
| 3/8 | 0.50 | 0.31 | 0.44 |
| 1/2 | 0.56 | 0.38 | 0.56 |
| 3/4 | 0.62 | 0.44 | 0.62 |
| 1 | 0.75 | 0.50 | 0.81 |
| 1 1/4 | 0.81 | 0.56 | 0.94 |
| 1 1/2 | 0.81 | 0.62 | 1.12 |
| 2 | 0.88 | 0.69 | 1.31 |
| 2 1/2 | 1.06 | 0.75 | 1.50 |
| 3 | 1.12 | 0.81 | 1.69 |
| 4 | 1.25 | 1.00 | 2.50 |
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| Nominal Pipe Size | Minimum Length, A | Nominal Head Diameter, E | Minimum Length, D |
| 1/8 | 0.38 | 0.41 | 1.38 |
| 1/4 | 0.44 | 0.53 | 1.62 |
| 3/8 | 0.50 | 0.69 | 1.62 |
| 1/2 | 0.56 | 0.84 | 1.75 |
| 3/4 | 0.62 | 1.06 | 1.75 |
| 1 | 0.75 | 1.31 | 2.00 |
| 1 1/4 | 0.81 | 1.69 | 2.00 |
| 1 1/2 | 0.81 | 1.91 | 2.00 |
| 2 | 0.88 | 2.38 | 2.50 |
| 2 1/2 | 1.06 | 2.88 | 2.75 |
| 3 | 1.12 | 3.50 | 2.75 |
| 4 | 1.25 | 4.50 | 3.00 |
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| Nominal Pipe Size | Minimum Length, A | Nominal Width Flats, F | Minimum Hex Height, C | |
| Bushing, G | Plug, H | |||
| 1/8 | 0.38 | 0.44 | — | 0.25 |
| 1/4 | 0.44 | 0.62 | 0.12 | 0.25 |
| 3/8 | 0.50 | 0.69 | 0.16 | 0.31 |
| 1/2 | 0.56 | 0.88 | 0.19 | 0.31 |
| 3/4 | 0.62 | 1.06 | 0.22 | 0.38 |
| 1 | 0.75 | 1.38 | 0.25 | 0.38 |
| 1 1/4 | 0.81 | 1.75 | 0.28 | 0.56 |
| 1 1/2 | 0.81 | 2.00 | 0.31 | 0.62 |
| 2 | 0.88 | 2.50 | 0.34 | 0.69 |
| 2 1/2 | 1.06 | 3.00 | 0.38 | 0.75 |
| 3 | 1.12 | 3.50 | 0.41 | 0.81 |
| 4 | 1.25 | 4.62 | 0.50 | 1.00 |
