Kitting is the process of grouping individual components into a single, pre-assembled kit before they are needed on the production line or shipped to a customer. Instead of pulling each individual part from stock at the point of use, the components are gathered and packaged together in advance, ready to be used or shipped as a single unit.
On a production line, kitting means gathering every component needed to build a specific sub-assembly or finished unit into one kit ahead of time, rather than having line workers pull each individual part from separate storage locations as they build. This reduces the time spent walking to different bins, cuts the risk of a missing or wrong component stopping the line mid-build, and makes it far easier to verify all needed parts are actually present before assembly starts.
EXAMPLE
Building a control panel requires 14 different components: a housing, a circuit board, 8 specific fasteners, 2 connectors, and 2 labels. Kitting gathers all 14 into one labeled kit before the build starts, rather than requiring the assembler to retrieve each part from its own bin during the build, which is slower and creates more opportunities for a missing or substituted part to go unnoticed.
A kit is built directly from a bill of materials, the BOM defines exactly which components and quantities belong in the kit, the same way it defines what goes into a finished product. Kitting is essentially a physical, advance execution of one section of the BOM, gathered ahead of time rather than pulled piece by piece at the moment of assembly.
This means kitting accuracy depends entirely on BOM accuracy, described in bill of materials: a kit built from an outdated BOM will be missing components, include the wrong quantity, or contain parts that a design change has since made obsolete, none of which becomes apparent until the kit is opened at the point of use.
Outside manufacturing, kitting also refers to combining multiple individual products into a single sellable unit for shipment, a promotional bundle, a starter pack combining several individually stocked items, or a set of replacement parts packaged together for a service call. The kit itself often becomes its own inventory item with its own identifier, distinct from its individual components.
Material requirements planning calculates component demand at the individual part level. When kitting is part of the process, MRP needs to account for kit-level demand translating into the same underlying component requirements, whether the kit is assembled in advance or components are picked individually at the point of use. Getting this translation wrong, either double-counting component demand or missing it entirely, produces exactly the kind of inaccurate purchase requirements described in material requirements planning.
Kits consume components in fixed ratios, one kit of a given type always requires the same set of parts in the same quantities. This makes kitting demand highly predictable compared to individually picked components, which is genuinely useful for purchasing and reorder point planning, but only if the kit definition itself, effectively a mini bill of materials, is kept accurate and current as products and designs change over time.
