MRO Inventory
MRO inventory consists of maintenance, repair, and operations materials used to keep assets and facilities operating but not normally sold as finished products.
What this term means in maintenance
MRO inventory consists of maintenance, repair, and operations materials used to keep assets and facilities operating but not normally sold as finished products.
What MRO inventory includes
MRO inventory may include:
- Bearings
- Belts
- Seals and gaskets
- Motors and gearboxes
- Electrical components
- Lubricants
- Filters
- Fasteners
- Tools and consumables
- Safety supplies
- Cleaning materials
Why MRO inventory matters
Maintenance needs the correct part at the correct time. Poor inventory control can create long downtime, while excessive stock ties up cash and increases obsolescence.
Practical example
A plant keeps critical pump seal kits, standard bearings, contactors, belts, and filters in controlled store locations. Work-order issues update stock and preserve usage history.
Important controls
Useful controls include:
- Part identification
- Unit of measure
- Store location
- Current balance
- Minimum and reorder levels
- Approved alternatives
- Supplier and lead time
- Asset compatibility
- Issue and return history
Common mistake
Managing spare parts only by description creates duplicate items and makes it difficult to know which assets use each part.
Related concepts
Related maintenance terms
Keep exploring connected CMMS, reliability, and maintenance planning terms.
Critical Spare
A critical spare is a replacement part whose unavailability could cause unacceptable equipment downtime, safety exposure, quality risk, or business interruption.
Reorder Point
A reorder point is the inventory level at which replenishment should be initiated so expected demand can be covered during supplier lead time.
Work Order
A work order is an authorized record that defines maintenance work to be performed, including the asset, priority, scope, assignee, instructions, labor, parts, status, and completion evidence.
MRO Inventory FAQs
- What does MRO stand for?
MRO stands for Maintenance, Repair, and Operations.
- What is included in MRO inventory?
Spare parts, components, lubricants, filters, tools, consumables, safety supplies, and other operating materials.
- Why is MRO inventory difficult to control?
Demand can be irregular, descriptions may be duplicated, lead times vary, and critical low-usage items are easy to overlook.