Form, fit, and function (FFF or F3) define the parameters that set the characteristics of a part:
When you consider whether to introduce a new part number or create a new revision for an existing part number—it’s important to consider and follow the form, fit, and function guidelines.
The shape, size, proportions, mass, and other visual characteristics that distinguish an item are referred to as form. This determines how the part or object “”looks.”” The capacity of an object to physically interface with all other components is referred to as fit.
*Source: https://www.technia.us
Data relating to items, components, or processes that are sufficient to allow physical and functional interchangeability, as well as data identifying source, size, configuration, mating and attachment characteristics, functional characteristics, and performance requirements, is referred to as form-fit-function data.
Form, fit, and function guidelines define how far subsequent revisions of a part can differ from the original before new part numbers are assigned. This is crucial for guaranteeing that components may be swapped out without difficulty.
*Source: https://www.technia.us
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