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The hard hitter has male NPT threads and is used for cleaning external surfaces.
| APC Part Number | Male Pipe Thread (NPT) | Outside Diameter | Overall Length |
| AP0125HH-01 | 1/8x27 | 0.406 | 0.562 |
| AP0250HH-01 | 1/4x18 | 0.562 | 0.562 |
| AP0250HH3-01 | 1/4x18 | 0.562 | 3.500 |
| AP0375HH-01 | 3/8x18 | 0.687 | 1.500 |
| AP0375HH-02 | 3/8x18 | 0.687 | 1.000 |
| AP0500HH-01 | 1/2x14 | 0.875 | 1.750 |
| AP0750HH-01 | 3/4x14 | 1.062 | 2.000 |
| AP1000HH-01 | 1.0x11.5 | 1.316 | 2.000 |
All Hard Cutters are equipped with wrench flats for ease of installation.