What MRO inventory means in plain language
MRO inventory is the storeroom behind the maintenance team: bearings, belts, seals, filters, fuses, lubricants and the other things that get used up or replaced. None of it is sold. It exists so that when a machine needs a part, the part is on the shelf.
It is the stock side of MRO, which is the wider category of maintenance purchasing.
Why it matters in maintenance
The cost of MRO stock is visible on a balance sheet. The cost of a stockout that idles a line is not, which is why MRO is chronically under-held. A part that costs little can stop a high-value line for days if it must be ordered and shipped.
Overstocking has its own cost: money and shelf space tied up in parts that never get used, and items that age or get lost. The goal is the right parts, not the most parts.
Managing it well
A few habits make the biggest difference.
- Link parts to the machines that use them, so critical spares are known.
- Set a minimum level for items that would stop production if missing.
- Log every movement in and out, so stock counts match the shelf.
- Review slow-moving items and decide whether to keep them.
Criticality drives stocking
Stock decisions should follow the consequence of a failure. Keep spares on site for critical machines and for parts with long delivery times, and rely on local suppliers for common, quickly available items. The asset registry is where those links are held.
How Firmicore relates
Firmicore's parts inventory has a categorized catalog, a multi-stage approval workflow, a stock movement log, purchase orders, supplier management and Excel import. Low-stock alerts are carried into shift handover reports.
Frequently asked questions
What is the difference between MRO and MRO inventory?
MRO is the category of supplies and services bought to keep a plant running. MRO inventory is the physical stock of those supplies you hold.
How do you decide which spares to hold?
Start with the machines that would stop production if they failed, then stock the parts with long lead times or no easy substitute.