For manufacturers and process plants, every minute of unplanned downtime can impact production schedules, revenue and customer commitments. While raw materials receive much of the attention in supply chain planning, Maintenance, Repair and Operations (MRO) procurement is equally important for keeping equipment running safely and efficiently.
MRO procurement is the process of sourcing, purchasing and managing the parts, supplies and services required to maintain industrial assets. These items do not become part of the finished product, but they directly support production by helping prevent equipment failures, reducing downtime and maintaining regulatory compliance. An effective MRO strategy helps control indirect spend. Although MRO purchases are often categorized as indirect procurement, they can have a significant impact on Total Cost of Ownership (TCO) through inventory carrying costs, emergency purchases, production interruptions and maintenance.
What strategies will work best at your organization depends on your facility’s equipment, operating environment, workflows, and failure risk. Read on to learn industry best practices in MRO procurement from Advanced Technology Services (ATS) and see what is recommended for your facility.
What does MRO stand for?
MRO stands for maintenance, repair and operations. It includes all the materials, equipment and services required to support production assets without becoming part of the finished product.
Examples
- Industrial spare parts such as bearings, motors, valves, and belts.
- Maintenance tools and consumables, including lubricants, adhesives and fasteners.
- Safety equipment and Personal Protective Equipment (PPE).
- Facility maintenance and janitorial supplies.
- Calibration, repair and inspection services.
What is an example of MRO procurement?
An example of MRO procurement is purchasing replacement bearings for a conveyor system before scheduled preventive maintenance. Other examples include sourcing safety gloves for maintenance technicians, contracting calibration services for precision instruments or replenishing industrial lubricants used throughout a manufacturing facility.
Why MRO procurement matters
An effective MRO procurement process helps manufacturers:
- Reduce costly production downtime
- Improve worker safety and regulatory compliance
- Extend equipment life through proactive maintenance
- Reduce emergency purchasing and expedited freight costs
- Improve visibility into indirect spending
- Optimize inventory without increasing stockout risk
One aerospace manufacturer saw what this looks like in practice. A single pump failure put a key customer relationship at immediate risk, and standard repair timelines pointed to a 6–12 week delay. Rather than absorb that wait, ATS sourced necessary parts, rebuilt, and tested a replacement pump and coordinated expedited delivery—back in service within four days. That eliminated the delay, preserved 7,360 production hours, and protected $2.53 million in total quantified business impact. See how our part repair services work.
Common MRO categories
Most industrial organizations manage MRO spending across several categories:
- Industrial spare parts: Critical replacement components including pumps, motors, gearboxes, electrical components, sensors, valves, and bearings.
- Tools and consumables: Hand tools, power tools, lubricants, cutting fluids, abrasives, adhesives, filters, and other frequently used maintenance items.
- Safety and PPE: Protective clothing, gloves, eye protection, lockout/tagout equipment, and other safety products required for regulatory compliance.
- Facility and janitorial supplies: Cleaning products, lighting, HVAC supplies, and general facility maintenance items that support plant operations.
The MRO procurement process
A structured MRO procurement process creates consistency while helping organizations balance cost, availability and reliability.
Map current procurement workflows
Begin by documenting how maintenance requests become purchase orders. Identify approval bottlenecks, duplicate purchasing activities and manual processes that increase lead times.
Segment MRO spend by criticality
Not every purchase deserves the same level of oversight. Critical spare parts with long lead times require different sourcing strategies than routine consumables. Which option works best depends on the equipment type, operating environment and the consequences of equipment failure.
Establish approval workflows
Define delegated purchasing thresholds and approval levels based on spend, criticality and supplier relationships. Standardized approval workflows reduce delays while maintaining purchasing controls.
Create purchasing templates
Standard purchase templates simplify repeat buys, improve specification consistency and reduce administrative effort.
How to choose the right suppliers
Supplier selection extends beyond price. A supplier evaluation process should include:
- Capability scorecards for quality, responsiveness and technical expertise.
- Verification of certifications and regulatory compliance.
- Lead-time commitments for critical inventory.
- Availability guarantees for high-risk components.
- Financial stability and supply chain resilience.
For highly specialized equipment, reliability and technical support may outweigh the lowest purchase price.
What works best depends on your facility’s unique equipment criticality and production risk. See what’s recommended for your facility if you’re evaluating supplier consolidation or long-term sourcing strategies.
Inventory management and tail-spend control
Inventory management remains one of the largest opportunities for improving MRO performance.
Best practices
- Performing ABC classification on all MRO SKUs
- Setting minimum and maximum inventory levels for critical A-items
- Auditing storeroom locations to eliminate duplicate inventory
- Consolidating low-value tail-spend purchases where practical
Effective MRO management balances inventory carefully. Excess inventory increases carrying costs, while insufficient inventory raises the likelihood of stockouts and unplanned downtime.
MRO sourcing strategies
There is no single sourcing strategy that fits every facility.
Strategic sourcing
High-value or business-critical parts typically benefit from long-term supplier relationships, negotiated pricing and planned inventory.
Vendor-managed inventory (VMI)
Vendor-managed inventory often works well for fast-moving consumables where suppliers can replenish inventory based on actual usage.
Just-in-time procurement
Just-in-time purchasing may reduce inventory costs for lower-risk items with predictable lead times. However, it is generally less suitable for components that could shut down production if unavailable.
Refurbished components
For specialty equipment, professionally refurbished components may reduce costs while maintaining reliability. Whether refurbished parts are appropriate depends on equipment specifications, warranty requirements and operational risk.
Standardize part families
Standardizing specifications across common bearings, motors, sensors, and fasteners simplifies inventory, increases purchasing volume and reduces supplier complexity.
Technology and analytics for MRO procurement
Digital tools improve visibility throughout the MRO supply chain.
Many manufacturers integrate:
- Computerized Maintenance Management Systems (CMMS)
- Enterprise Resource Planning (ERP) and E-Procurement Platforms
- Automated reorder triggers
- Spend analytics dashboards
- Supplier performance reporting
A CMMS connects maintenance work orders with inventory usage, helping procurement teams understand which parts are consumed most frequently and when replenishment is needed.
Machine health monitoring
Predictive technologies further improve procurement planning. Vibration sensors, temperature monitoring and condition monitoring systems can detect early signs of equipment deterioration. Predictive maintenance software then estimates likely failure windows, allowing procurement teams to order replacement parts before breakdowns occur. This approach can reduce emergency purchases while improving maintenance scheduling.
Reliability engineering and maintenance planning
Procurement performs best when aligned with maintenance planning. Organizations should:
- Establish preventive maintenance schedules by asset class using corrective, preventive, predictive and precision maintenance strategies.
- Align procurement lead times with planned maintenance windows.
- Build spare-parts kits for critical assets.
- Review asset lifecycle costs on a regular basis.
How to choose the right maintenance strategy depends on equipment age, operating conditions, production requirements, and failure consequences. Organizations with limited internal maintenance resources may also benefit from partnering with experienced reliability specialists, such as ATS, to expand predictive maintenance and asset optimization programs.
Supplier management and contracting
Strong supplier relationships can improve long-term MRO performance.
Recommended practices include:
- Consolidating preferred suppliers for core categories.
- Negotiating blanket purchase agreements.
- Evaluating consignment inventory opportunities.
- Establishing Service-Level Agreements (SLAs) for delivery performance and quality.
- Conducting quarterly supplier performance reviews.
Monitoring KPIs such as on-time delivery, defect rates and responsiveness helps identify opportunities for continuous improvement.
Managing risk across the MRO supply chain
Supply disruptions can quickly impact maintenance operations. To improve resilience:
- Identify alternate suppliers for critical SKUs
- Prequalify secondary vendors for emergency sourcing
- Maintain contingency plans for long-lead components
- Periodically review supplier risk and business continuity capabilities
Which diversification strategy works best depends on supplier availability, geographic risk and the criticality of each component.
Safety, calibration and repair services
MRO procurement also includes services that support equipment reliability and compliance.
Best practices
- Verifying safety documentation for procured products.
- Scheduling regular calibration of precision equipment.
- Partnering with qualified repair centers for component refurbishment.
- Completing return-to-service inspections after repairs.
KPIs for continuous improvement
Leading manufacturers regularly monitor KPIs including:
- On-time supplier delivery percentage.
- Monthly stockout incidents.
- Total cost per maintenance event.
- Inventory turnover.
- Supplier performance metrics.
- Savings achieved through supplier consolidation.
Periodic reviews of MRO strategy help organizations identify waste, improve purchasing decisions and continuously optimize indirect spending.
Integration and digital procurement
Modern procurement platforms make supplier management more efficient by integrating with ERP systems and leading e-procurement marketplaces.
These capabilities enable:
- Cross-catalog search across multiple suppliers
- Real-time price benchmarking
- Automated purchasing workflows
- Improved compliance with purchasing policies
How ATS supports industrial MRO procurement
For organizations looking to improve equipment reliability across one or multiple facilities, ATS provides comprehensive maintenance strategies such as contract maintenance, predictive maintenance, preventive maintenance, and reliability engineering services that complement existing maintenance teams. ATS helps manufacturers improve asset management, optimize maintenance planning and strengthen long-term MRO strategies through data-driven reliability programs.
Implementation roadmap
A practical implementation plan typically includes:
1. Conduct a baseline assessment of MRO spend and inventory.
2. Prioritize quick-win opportunities for supplier consolidation.
3. Implement or expand CMMS and procurement system integrations.
4. Train procurement, maintenance and storeroom personnel.
5. Measure results using supplier, inventory and maintenance KPIs.
Frequently asked questions
What is MRO in supply chain?
Within the supply chain, MRO refers to the procurement and management of maintenance, repair and operations materials that support production without becoming part of the finished product. Effective MRO procurement reduces downtime, improves reliability and helps control indirect spending.
Should you choose just-in-time or vendor-managed inventory?
Which option works best depends on equipment type, inventory criticality and supplier reliability. Just-in-time purchasing is often appropriate for lower-risk items with predictable demand, while vendor-managed inventory is frequently recommended for fast-moving consumables that require consistent replenishment.
How can manufacturers prevent common inventory problems?
Regular ABC inventory reviews, accurate CMMS data, standardized part specifications, supplier performance monitoring and routine storeroom audits help reduce duplicate inventory, prevent stockouts and improve overall MRO efficiency.
