Part
    
ASME Y14.100 : Engineering Drawing Practices
One item, or two or more items joined together, that is not normally subject to disassembly without destruction or impairment of designed use (e.g., transistor, composition resistor, screw, transformer, and gear).
See Also:
Nonpart Drawing, Symmetrically Opposite Part, Item, Inseparable Assembly, Product, End Item
Alternate Definitions:

Action Engineering - A single hardware item.

QIF - one item, or two or more items joined together, that is not normally subject to disassembly without destruction or impairment of designed use

Note 1 to entry: In QIF, part means the design of a part, and a physical instance of a part is called an actual component.

MBE Maturity Index - A distinct item of a product.