| PSC | Description
|
| 2805 | Gasoline Reciprocating Engines, Except Aircraft; and Components |
| 2810 | Gasoline Reciprocating Engines, Aircraft Prime Mover; and Components |
| 2815 | Diesel Engines and Components |
| 2820 | Steam Engines, Reciprocating; and Components |
| 2825 | Steam Turbines and Components |
| 2830 | Water Turbines and Water Wheels; and Components |
| 2835 | Gas Turbines and Jet Engines; Non-aircraft Prime Mover, Aircraft Non-prime Mover, and Components |
| 2840 | Gas Turbines and Jet Engines, Aircraft, Prime Moving; and Components |
| 2845 | Rocket Engines and Components |
| 2850 | Gasoline Rotary Engines and Components |
| 2895 | Miscellaneous Engines and Components |