7 Reasons Your Spare Parts Room Runs Short
Picture a technician who needs one specific bearing to finish a repair. The shelf that should hold it is empty. Nobody flagged it, nobody ordered more, and the job stalls until a rush order finally arrives. Reliabilityweb frames stockroom performance as a service agreement between the stockroom and maintenance: the stockroom is expected to have the right parts available in the right quantities, and a stockout is what happens when that service level breaks down.[1]
Stockouts can develop when reorder levels, usage, lead times, and asset criticality aren’t reviewed together. Fixing those gaps protects equipment reliability and keeps maintenance management from turning into a search party every time something breaks.
7 Problems That Quietly Empty a Stockroom
Spare parts shortages rarely come from one decision. They usually develop through a combination of outdated reorder settings, incomplete usage tracking, poor visibility into upcoming demand, and unclear ownership. Here are seven problems worth checking before the next critical part runs out.
1. Reorder Points Were Set Once and Never Revisited
Problem: Someone enters a reorder point when a part is first added to inventory, based on the usage and operating conditions at the time. Nobody reviews it after those conditions change.
Impact: Usage patterns can shift as equipment ages, production changes, or maintenance strategies evolve, while the reorder point remains fixed at a number that no longer reflects actual demand.
Fix: Review reorder points and stock quantities on a defined schedule and whenever equipment usage, production volume, or supplier lead times change significantly. Don’t wait for a stockout to reveal that the setting is outdated.
2. Critical Parts Get Treated Like Ordinary Inventory
Problem: A common, easily sourced fastener and a long-lead-time replacement part for a critical asset are managed with the same stocking approach, even though the consequences of running out are very different.
Impact: The stockroom can end up carrying too much of what is easy to replace while carrying too little of a part whose absence could extend a significant equipment outage.
Fix: Set stocking priorities using a combination of asset criticality, expected usage, supplier lead time, availability, and the consequences of a stockout. Do not base stocking levels on usage alone.
3. Parts Get Used Without Updating the Count
Problem: A technician takes a part from the stockroom during a repair, finishes the job, and the inventory transaction is recorded later, if it is recorded at all.
Impact: The system can show a part as available even though the physical quantity is lower. The next technician discovers the discrepancy only when the part is needed.
Fix: Tie parts usage directly to the work order that consumes the part so inventory is updated when the part is recorded as used. The goal is to keep the system quantity aligned with the physical stock.
4. Nobody Ties Stock Levels to the PM Schedule
Problem: The stockroom plans purchases mainly from historical usage without checking what the upcoming preventive maintenance schedule will require.
Impact: A predictable increase in demand, such as ten identical filters needed for ten scheduled PMs next month, can become a surprise shortage instead of a planned purchase.
Fix: Review upcoming PM work against available inventory and expected deliveries. Use the schedule to anticipate predictable demand before technicians discover an empty shelf.
5. The Room Is Full of Parts Nobody Needs Anymore
Problem: Parts for retired equipment, over-ordered surplus, obsolete items, damaged stock, and duplicate entries can occupy valuable shelf space alongside parts the maintenance team still needs.
Impact: Finding the right part takes longer, inventory value becomes harder to assess, and usable stock can be obscured by items that no longer serve an active maintenance need.
Fix: Periodically review stock against active asset management records and identify obsolete, duplicate, damaged, or genuinely unnecessary parts. Do not automatically dispose of every part associated with retired equipment; first check whether the part remains compatible with other assets or has enough strategic value to retain.
6. Lead Times Aren’t Factored Into Reorder Timing
Problem: A reorder point is based mainly on how many units are usually kept on hand, without accounting for how long the supplier actually takes to deliver.
Impact: An order may be placed only after the stock has fallen too low to cover expected demand during the supplier’s lead time, leaving the part unavailable while the team waits for delivery.
Fix: Set reorder points using expected demand during supplier lead time, plus an appropriate safety-stock buffer. Review the setting when demand variability or supplier performance changes.
7. Nobody Owns the Stockroom’s Accuracy
Problem: Inventory counts, part names, locations, and transactions drift over time, and no one has clear responsibility for identifying and correcting those issues.
Impact: Small inconsistencies accumulate until technicians and maintenance planners stop trusting the inventory record enough to rely on it.
Fix: Assign clear organizational ownership for stockroom accuracy, and use your CMMS software to track inventory counts, locations, transactions, and review activity. Someone should be accountable for catching and correcting inventory drift before it becomes a maintenance problem.
Where a CMMS Fits Into Fixing the Stockroom
Reliabilityweb also makes the case that spare-parts inventory works less like a warehouse to minimize and more like an insurance policy. The cost of holding a critical part is the premium, while the downtime it helps avoid is part of the value of having it available.[2]
A CMMS does not decide which parts deserve that level of coverage. It gives the maintenance and stockroom teams the data to make that decision deliberately instead of by habit. eWorkOrders connects inventory information with the maintenance work that consumes parts, helping teams keep stock levels aligned with actual usage.
- Parts usage tied to work orders: Record parts against the work that uses them so inventory transactions reflect actual maintenance activity.
- Reorder points and low-stock alerts: Monitor inventory thresholds and review them against current demand, lead time, and criticality.
- Inventory visibility alongside PM work: Compare upcoming preventive maintenance needs with available stock so predictable demand can be planned before the job is due.
- Asset and lifecycle information: Use asset status and maintenance records to identify parts that may need review after equipment is retired or decommissioned.
- Inventory reporting: Review stock levels, usage, carrying costs, and stockout patterns to support maintenance management and equipment reliability decisions.
The goal is not to keep every possible part on the shelf. It is to maintain the right parts, in the right quantities, with enough visibility to act before a shortage turns into downtime.
Frequently Asked Questions
What’s a healthy stockout rate for a maintenance stockroom?
There is no single target that applies to every stockroom. Useful targets depend on part criticality, supplier lead times, availability, and the service level the maintenance organization needs. A recurring pattern of stockouts involving the same critical parts is usually more useful to investigate than a single overall percentage.
Should every part get the same stocking priority?
No. A common part that is easy to source and a long-lead-time part supporting a critical asset carry very different risks if they run out. Stocking decisions should reflect asset criticality, expected demand, lead time, availability, and the consequences of a stockout rather than treating every part the same way.
How often should reorder points be reviewed?
Review them on a defined schedule and whenever equipment usage, production volume, demand patterns, or supplier lead times change meaningfully. Reviewing a reorder point only after a stockout has already caused a problem means the correction arrived too late.
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