What these programs solve
A repeat OEM component can have two very different quantities: the economic production lot and the quantity the customer wants to consume or release at one time. VMI, stocking and scheduled-release programs are used to separate those two constraints.
Instead of forcing every customer release to trigger a new casting, machining and international-logistics cycle, an agreed quantity can be produced in planned lots and positioned as inventory. Customer releases then draw from that stock while replenishment restores the agreed level.
VMI, JIT and stock-and-release are not the same thing
Vendor-managed inventory (VMI)
Under a VMI program, the supplier and customer define the inventory rule — for example Min/Max levels, safety stock, forecast horizon, consumption data and replenishment trigger — and the supplier manages replenishment against that rule.
JIT delivery
Just-in-time (JIT) describes the delivery or release timing into the customer's operation. JIT can be supported by local inventory, a nearby 3PL, scheduled releases or another agreed logistics route. It does not mean the part itself is manufactured only after the customer requests it.
Stock-and-release / blanket orders
A blanket order or stock-and-release program can reserve a larger planned quantity while allowing the customer to call off smaller releases. Ownership, invoicing, storage period, forecast commitment and replenishment rules are defined in the commercial agreement.
Kanban replenishment
Kanban can be used as the signal that stock has been consumed and should be replenished. The signal may be tied to bins, electronic usage data or another customer-defined workflow.
How we structure a repeat supply program
- Map annual demand and release behavior. Define annual usage, typical release quantity, seasonality and forecast horizon.
- Identify the economical production lot. Casting, machining, polishing, testing and setup costs often favor a production lot larger than one customer release.
- Set the inventory rule. Agree Min/Max, safety stock, ownership, aging limits and any special packaging or traceability requirements.
- Choose the stock location. Depending on the program, inventory can be held through agreed warehouse or 3PL arrangements in the United States, Europe or China.
- Define the release signal. Scheduled releases, Kanban, consumption data or customer call-offs trigger shipment and replenishment.
- Review the program periodically. Forecast accuracy, demand changes, obsolete revisions and inventory turns should be reviewed rather than leaving the original parameters unchanged indefinitely.
Proven Wisconsin VMI program
For a Wisconsin pump customer, the supply model combined larger planned production lots + local third-party inventory + VMI Min/Max + safety stock + Kanban replenishment + JIT release. Once stock was positioned near the customer, release lead time for stocked parts was reduced to roughly 1–2 days in that project.
The program also allowed manufacturing improvements and larger production lots to reduce recurring cost while the customer continued consuming smaller quantities. Read the Wisconsin pump-housing case study ↗
Where this model fits best
VMI / JIT / stocking is usually most useful when the part is already stable enough to have repeat demand, controlled revisions and a forecast that can support replenishment planning. Typical candidates include machined castings, pump and valve components, sanitary components and other OEM metal parts with international production lead times.
It is less suitable for one-time prototypes, highly unstable designs or parts whose demand cannot support a sensible inventory rule.
Quality, revision and traceability controls still apply
Stock is only useful if the correct revision and documentation can be released. The program should therefore define revision cut-in rules, lot / heat traceability, shelf or corrosion protection where relevant, packaging, inspection records and how obsolete stock is handled after an engineering change.
Information to define before quotation
- Annual usage and expected release quantity
- Forecast horizon and update frequency
- Economic production lot or current MOQ constraint
- Desired Min/Max and safety-stock level
- Preferred warehouse region and target release lead time
- Inventory ownership and invoicing point
- Incoterms, freight and replenishment responsibility
- Kanban / consumption signal or scheduled-release method
- Revision-control and obsolete-inventory rules
- Packaging, traceability and documentation requirements