Interchangeable parts

Magneto assembly on the Ford assembly line, 1913. Large crates of identical bolts, nuts and other components can be seen under the conveyor, and the magnetos are themselves also interchangeable.

A pulley block for rigging on a sailing ship

Interchangeable parts are parts (components) that are, for practical purposes, identical. They are made to specifications that ensure that they are so nearly identical that they will fit into any assembly of the same type. One such part can freely replace another, without any custom fitting (such as filing). This interchangeability allows easy assembly of new devices, and easier repair of existing devices, while minimizing both the time and skill required of the person doing the assembly or repair.

单词	Selective assembly
释义	Selective assembly 英语百科 Interchangeable parts Interchangeable parts are parts (components) that are, for practical purposes, identical. They are made to specifications that ensure that they are so nearly identical that they will fit into any assembly of the same type. One such part can freely replace another, without any custom fitting (such as filing). This interchangeability allows easy assembly of new devices, and easier repair of existing devices, while minimizing both the time and skill required of the person doing the assembly or repair.
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Selective assembly

Interchangeable parts