In short
- Excess and stockouts coexist because reordering runs on memory rather than consumption data.
- Line-side stock and material at sub-contract vendors are the two largest sources of book-to-physical variance.
- Stock becomes trustworthy when material is issued against work orders and counted continuously.
- WIP concentrates in one or two stages; making it visible by stage is what allows it to be reduced safely.
Why plants carry the wrong stock
Walk a Hosur auto-component plant and you find racks of slow-moving bought-outs alongside a line stopped for a fastener. Too much and too little at once.
The cause is rarely carelessness. It is that reordering runs on memory. A storekeeper who remembers a painful stockout orders generously forever after; an item nobody remembers running short of is ordered late every time. Neither decision connects to how fast the item actually moves.
Layered on top is WIP, which accumulates between press, machining, plating and assembly, and at sub-contract vendors. Spread across locations and partners, no single number tells you how much cash sits in it.
Make stock trustworthy first
Before optimising anything, physical and system stock must agree, or every downstream calculation is built on sand and people revert to walking to the rack.
- Issue against work orders. Material leaves stores against a specific job, not a verbal request. Usually the single largest improvement.
- Distinct locations. Raw, line-side, WIP, finished and vendor stock tracked separately with bins inside them.
- Cycle counting. A rolling weekly count of a small subset rather than one annual stocktake.
Cycle counting is the discipline most resisted and the one that pays back fastest, because it surfaces process errors while they are small enough to diagnose. See inventory management.
See how this runs on your own part numbers, schedule to dispatch.
Line-side stock deserves its own treatment
Line-side inventory is consumed differently from store stock and is frequently the largest source of variance. It is also where excess hides most comfortably, because bins look normal whether they hold two days or two weeks of cover.
Practical controls: define bin quantities deliberately rather than by habit, replenish on a pull signal rather than by delivering a pallet, and count line-side as part of the cycle count rota rather than treating it as consumed the moment it leaves stores.
Count what is at your vendors
Material sent for plating, heat treatment or outside machining is inventory you own, sitting where you cannot see it. When it is invisible two things happen: you reorder material you already have, and you write off shortfalls at reconciliation because nobody can say what went out and what came back.
Tracking challan issue, return, scrap and permissible process loss per vendor closes both gaps and produces ITC-04 data as a by-product. Our vendor management page covers the mechanics.
Want a fixed-scope ERP plan for your Hosur plant?
Reducing WIP without risking dispatch
WIP reduction fails when it is attempted as a target rather than as a consequence. Make it visible by stage first, including at vendors. Most plants discover the excess sits in one or two specific stages, usually before a sub-contract operation or before final inspection.
Then reduce it by releasing work in smaller, more frequent batches rather than by squeezing the target. Smaller batches move faster, expose problems sooner and reduce the stock trapped between stages, without reducing output.
| Measure | What it tells you |
|---|---|
| Stock accuracy from cycle counts | Whether any other number can be trusted |
| WIP value by stage | Where cash is actually trapped |
| Inventory turns by class | Whether cash is moving |
| Stockout events that stopped a line | Real service failure, counted not estimated |
| Non-moving stock | Decisions deferred |
What good looks like
- Material issued against work orders, never verbally.
- Line-side, WIP and vendor stock all counted and visible.
- Reorder levels set from consumption data rather than memory.
- Weekly cycle counts with accuracy trending into the high nineties.
- Non-moving stock reviewed quarterly with an explicit decision on each item.
Non-moving stock does not become useful by being carried another year. Writing it off honestly frees both cash and rack space.
Key Takeaways
- Excess and stockouts coexist because reordering runs on memory rather than consumption data.
- Fix stock accuracy first: issue against work orders, distinct locations, weekly cycle counts.
- Line-side stock and vendor-held material are the two largest sources of variance.
- Make WIP visible by stage before trying to reduce it; the excess usually sits in one or two stages.
- Reduce WIP by releasing smaller, more frequent batches rather than by setting a target.
- Review non-moving stock quarterly and make an explicit decision on each item.
Frequently Asked Questions
Because reordering is driven by memory rather than consumption data, so items associated with a past stockout get over-ordered indefinitely while others are ordered late every time.
Issue material against work orders rather than verbally, track distinct locations with bins, and run weekly cycle counts on a rotating subset instead of one annual stocktake.
It is consumed differently from store stock and bins look normal whether they hold two days or two weeks of cover, so excess hides there comfortably.
Yes. It is stock you own and paid for. If it is invisible you will reorder it and write off unexplained shortfalls at reconciliation.
High nineties by count is achievable once issues are booked against jobs and cycle counting is routine. Below the low nineties people stop trusting the system.
Make it visible by stage first, then release work in smaller more frequent batches. Smaller batches move faster and trap less stock without reducing output.
Far less than an annual stocktake. Counting a small rotating subset weekly takes minimal time and catches process errors early.
Review quarterly and decide explicitly: use, sell or write off. Carrying it another year does not make it useful.
Stock accuracy, because every other number depends on it. Turns and WIP are only meaningful once the underlying figure is trustworthy.
Yes, particularly for line-side replenishment of high-runner items, where a pull signal keeps the line fed without the excess a scheduled pallet delivery creates.
Conclusion
Inventory is where most auto-component suppliers have cash they cannot see. The path out is unglamorous but reliable. Make stock trustworthy by issuing against work orders and counting continuously. Treat line-side stock and material at sub-contract vendors as the distinct, high-variance categories they are. Make WIP visible by stage before attempting to reduce it, then reduce it through smaller batches rather than targets. None of this requires heroics, only the discipline to book transactions as they happen.
Want to see how much cash sits in your stores and WIP?
Talk to our Hosur team, or book a free demo and see it on your own part BOM.