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Kitting, Consignment and Vendor-Managed Inventory

VMI moves the stock to where it is consumed and the replenishment decision to the supplier — so the buyer stops carrying a warehouse and starts carrying a forecast.

Bins at lineConsignmentReplenishmentKits
Short answer. Kitting and vendor-managed inventory (VMI) means we hold or replenish the stock at your site — or your customer's — against an agreed min/max level or a forecast. Kitting goes further: a set of parts for one assembly, picked and packed together, so the line receives one item instead of nine. Consignment means the stock is yours to use and ours to own until it is consumed.

Key facts

What is included, what it costs, how long it takes.
VMI modelMin/max bins at the point of use, replenished on a fixed cycle or on consumption data
ConsignmentStock owned by us until issued; invoiced on consumption
KittingMulti-part sets per assembly, picked, labelled and sealed
Replenishment cycleWeekly or bi-weekly, depending on consumption rate
VisibilityStock report per bin, consumption history and forecast variance
Typical scopeBearings, seals, lubricants and the fasteners that go with them
ExitConsignment stock returned or bought out at the agreed price — defined in the agreement

Three models, three different problems

Do not confuse them.

VMI, consignment and kitting compared

They are often sold together but they solve different problems.
ModelWho owns the stockWhat it solvesWhat it costs
VMI (min/max bins)BuyerStockouts and emergency ordersA small handling premium or a service fee
ConsignmentSupplier until issuedWorking capital tied up in slow-moving partsPrice per piece, no stock on the buyer's books
KittingBuyerLine-side picking errors and timePer-kit picking and packing charge

What makes a VMI programme work

Three rules, learned the hard way.
  1. Define the boundary in writing. Which bins, which parts, what min and max, who counts, how often, and what happens when a part is discontinued. A VMI without a defined boundary becomes an argument about stock counts.
  2. Agree the exit before the start. Consignment stock must be returnable or buyable-out at a stated price. Suppliers who cannot exit a programme price it as a permanent liability.
  3. Measure the thing you care about. Fill rate on the bins and the number of emergency purchases are the two numbers that show whether it is working. Stock value alone tells you nothing.

Where it pays

High-consumption, low-value, many-part positions.

VMI pays where the cost of a stockout is much higher than the cost of the stock: a production line waiting for a 6205, a maintenance team with a machine down, a service van without the right seal. It pays less where consumption is unpredictable or where the parts are expensive and slow-moving — there, consignment or a simple safety stock is the better instrument.

Practical note. Start with one production line or one customer site, run it for a quarter, then decide. A programme rolled out across a plant before the replenishment cycle is tuned usually ends with too much stock in some bins and none in others.

What a programme includes

Scope items, and who does them.
ItemIncludedDone byFrequency
Bin supply and labellingYesUsAt setup
Min/max settingYesJoint, based on 8-week consumptionAt setup, reviewed quarterly
Physical countingYesUsEach replenishment visit
Replenishment orderYesUs, from the countWeekly / bi-weekly
Consumption reportYesUsMonthly
Obsolescence reviewYesJointAnnually
Emergency call-offYesUsWithin 24 h

Who it is for

The buying situation this service was built around.

Frequently asked questions

What does VMI cost?

Either a small handling premium on the unit price or a fixed service fee per bin per month, depending on the volume and the visit frequency. It is quoted against a defined part list and site, not as a percentage.

Who owns consignment stock?

We do, until it is issued from the bin. It is invoiced on consumption, which means it does not sit on the buyer's balance sheet as inventory.

What happens at the end of a programme?

Consignment stock is returned or bought out at the agreed price, stated in the agreement before it starts. Bins and labels are removed at no charge.

Can VMI cover other parts besides bearings?

Yes — seals, lubricants and the fasteners that are consumed with them. Consolidating the whole kit at one supplier is usually the point of the exercise.

How is the min/max set?

From eight weeks of consumption history, the lead time and the criticality of the part. It is reviewed quarterly, because a min/max that is never adjusted becomes either a stockout or dead stock.

Tell us the position and the constraint

Send the drawing, the model list or the failure report. We reply with a scope, a price and a lead time within 30 minutes on working days.