1. Material Type: The type of metal used to manufacture the part, e.g. aluminum, stainless steel, carbon steel, brass, bronze, etc.

2. Dimensions: The size and shape of the part, including length, width, and height.

3. Tolerance: The degree to which the dimensions of the part must be accurate to ensure proper function.

4. Surface Finish: The quality and smoothness of the surface of the part, which is often measured in terms of roughness, gloss, or texture.

5. Hardness: The level of hardness required for the part to withstand the pressure and stress it will be exposed to during operation.

6. Strength: Depending on the application, the part may need to be strong enough to bear heavy loads or withstand high temperatures.

7. Corrosion Resistance: Depending on the environment in which the part will be used, it may need to be resistant to corrosion or other forms of degradation.

8. Coating: Additional coatings may be required to impart specific properties like lubrication, wear resistance, or heat resistance.