Kitting in Manufacturing: What It Is, How It Works, and Why It Matters

Kitting in manufacturing is one of the simplest ideas with one of the highest returns: instead of releasing a job to the shop floor and letting operators hunt for the materials they need, you pre-group every required component into a single container before production begins. The result is fewer interruptions, faster setup, and a shop floor that actually follows its schedule.

This guide covers exactly what kitting is, how it differs from picking, the step-by-step mechanics of building a kitting operation, and how kitting connects to production scheduling systems like RMDB.

What Is Kitting in Manufacturing?

A kit is a pre-assembled collection of all the parts, sub-assemblies, hardware, and materials required to complete a specific production order. Kitting is the process of creating those kits — pulling components from inventory storage, verifying quantities, and staging them as a complete package tied to a particular job.

The key word is "pre-grouped." Kitting happens before the job arrives at the work center, not during production. The operator opens the kit container and has everything needed to start. No trips back to the stockroom. No waiting for a forklift to deliver a forgotten component.

Kitting is common in:

• Electronics assembly — PCB kits with boards, components, solder, connectors
• Medical device manufacturing — procedure trays with instruments, fasteners, implants
• Job shops — custom machining kits with raw stock, tooling, and setup documentation
• Defense and aerospace — serialized kits with full traceability requirements
• Automotive sub-assembly — fastener kits, seal kits, wiring harness packages

Kitting vs. Picking: What Is the Difference?

Picking and kitting are related but distinct warehouse activities that are often confused.

Picking is the act of retrieving individual items from their storage locations in the warehouse based on a pick list. A picker walks (or drives) through the warehouse, collects items one at a time, and deposits them in a staging area. Picking is a component activity — it answers the question "did we get the right items in the right quantities?"

Kitting is the assembly of picked items into a unified package tied to a specific production order. The kitter receives the picked components (or does the picking themselves), verifies the full set is complete, organizes them in a container or tote, attaches the job documentation, and stages the kit for delivery to the work center.

In simpler terms: picking gathers. Kitting consolidates.

In some operations, picking and kitting are performed by the same person in a single pass. In larger, higher-volume environments, they are separate roles: pickers run routes through the warehouse, and kitters assemble and verify the kits at a dedicated kitting station.

The distinction matters for scheduling because picking lead time and kitting lead time are both constraints that must be factored into the production schedule. If a job is scheduled to start at 8:00 AM Monday, someone needs to know when to begin the pick-and-kit process to hit that start time with confidence.

How a Kitting Process Works: Step by Step

Step 1: Generate the Kit List from the Production Schedule

Kitting starts with the schedule, not the warehouse. When a job is released for kitting, the scheduling system or MRP generates a kit list — essentially a bill of materials filtered for that specific job, specifying item numbers, required quantities, lot numbers (if applicable), and the required delivery date and work center.

RMDB releases jobs to the floor based on material availability and capacity. When a job is cleared for kitting, the kit list reflects exactly what the BOM specifies for that job's configuration, with no manual transcription required.

Step 2: Verify Material Availability Before Starting

Before a kitter touches a single bin, the system should confirm that all required materials are on hand and available (not reserved for another job, not in quarantine, not on hold for quality reasons). This pre-check is the difference between a kit that completes smoothly and one that stalls halfway through because a critical component is out of stock.

If a component is short, the kitting exception is flagged immediately — before the job is scheduled to start — giving planners time to expedite, substitute, or reschedule. Catching this at the kitting stage is far less disruptive than discovering the shortage mid-production.

Step 3: Pull and Count Components

The kitter works through the kit list, pulling components from their storage locations and counting them into the kit container. For items with lot traceability requirements, the kitter records the lot number and expiration date (especially important when FEFO inventory rotation is in effect).

For high-mix operations, kitting stations often use pick-to-light systems or digital pick lists displayed on tablets. These reduce counting errors and speed up kit assembly by guiding the kitter through each line item with visual confirmation.

Step 4: Verify the Complete Kit

After all components are pulled, the kitter performs a final count verification — either manually or via barcode scanning — to confirm that every line item is present in the correct quantity. This kit accuracy check is the quality gate that protects the shop floor.

The target kit accuracy rate in world-class operations is 99.5% or higher. Below 98%, kit errors become a measurable drag: operators are leaving their work centers to retrieve missing parts, which breaks production flow and throws off the schedule.

Step 5: Stage and Deliver to the Work Center

The verified kit is labeled with the job number, work order, due date, and work center. It is then staged in the designated kit staging area — organized by job priority and scheduled start time — and delivered to the work center before the job is due to start.

Some manufacturers use a "kit ready" signal to the scheduling system, which confirms that the job can start as planned. If the kit is not ready by the required time, the scheduling system flags the delay and the scheduler can take action before the work center sits idle.

The Impact of Kitting on Production Scheduling

Kitting has a direct and measurable impact on scheduling performance:

Schedule adherence improves. Jobs that start on time start on time because the materials are there. The most common reason jobs start late is missing materials — kitting eliminates that cause. A job shop that implemented a formal kitting process reported setup-to-first-cut time dropping from an average of 47 minutes to 18 minutes across all work orders.

Cycle time variability decreases. When operators do not have to interrupt production to retrieve materials, cycle times stabilize. Stable cycle times mean the scheduler's estimates are accurate, which means the schedule is reliable. A reliable schedule is the foundation of on-time delivery.

Capacity is protected. Every minute a work center sits idle waiting for materials is a minute of capacity lost forever. Kitting moves the material retrieval activity off the critical path of production and into the warehouse, where it can be performed in parallel with the preceding job.

WIP is reduced. Kitting enforces discipline around job release. A job is not released to the floor until its kit is complete and verified. This prevents the common failure mode of releasing jobs early (to "keep operators busy") that results in WIP piling up on the floor while operators wait for missing parts.

Connecting kitting status to RMDB's scheduling engine allows planners to see — in real time — which jobs have completed kits, which kits are in progress, and which have unresolved shortages. This visibility is essential in high-mix environments where 20 or 30 jobs may be in various stages of preparation simultaneously.

Kitting System Design: Key Decisions

Centralized vs. Decentralized Kitting

Centralized kitting consolidates kit preparation in one location, typically adjacent to the warehouse. All kits are prepared by dedicated kitting staff and delivered to work centers. This model works well when the warehouse and production floor are close and when kit complexity is high enough to justify specialization.

Decentralized kitting allows work center operators (or dedicated work-center kitters) to prepare their own kits from a point-of-use supermarket stocked by the warehouse. This model reduces delivery travel but requires disciplined kanban replenishment at each point of use.

Most manufacturers with 20 or more active work orders per day find centralized kitting more effective because it keeps kit accuracy checks in one location and separates the skilled kitting function from production.

Kit Containers and Labeling

The physical container matters. A kit stored in an open cardboard box is easy to contaminate, lose components from, and mis-identify. Standard approaches include:

• Segmented plastic totes with compartments for each component category
• Pegboard or shadow-board panels for large components
• Anti-static trays for electronic components
• Serialized kit labels with barcodes linking to the work order in the system

Handling Partial Kits

In an ideal world, no job starts without a 100% complete kit. In practice, especially during supply disruptions, planners sometimes authorize partial kits — jobs that can begin on a sub-assembly while a missing component is expedited.

If partial kits are allowed, establish clear rules: which components are "soft" (the job can start without them) versus "hard" (the job cannot proceed past a certain operation without them). Document these rules in the production SOP for kitting and enforce them consistently.

Measuring Kitting Performance

Track these four metrics to manage kitting effectiveness:

Track shortage rate separately from kit accuracy — a shortage is a supply chain failure (the part was not in stock), while a kit error is a kitting process failure (the part was in stock but pulled incorrectly or in the wrong quantity). The root causes and corrective actions are different.

Kitting and the Supply Chain Connection

Kitting is a downstream activity in the supply chain inventory management cycle. It sits between receiving/storage and production, and its effectiveness depends on everything upstream being correct: accurate inventory records, reliable safety stock, disciplined receiving, and timely supplier delivery.

When inventory records are inaccurate, kit preparation stalls because the system shows a component as available when it is physically missing (or shows it missing when it is actually sitting in an unlabeled location). Cycle counting — especially for A and B items used frequently in kits — is the operational discipline that keeps kitting running smoothly. See the ABC analysis guide for how to prioritize cycle count effort.

Frequently Asked Questions

Connect Kitting to Your Production Schedule

A disciplined kitting process eliminates the most common reason jobs start late: missing materials. When kitting is integrated with your scheduling system, the result is a shop floor that runs on its schedule rather than around it. RMDB manages material constraints, capacity, and job release in a single system — so kit status and job status are always in sync. Contact User Solutions to see how manufacturers have reduced shop floor interruptions and improved on-time delivery by connecting kitting to finite capacity scheduling.