When’s the Best Time to Optimize Your MRO Inventory and How to Do It?

In many manufacturing sectors, Maintenance, Repair, and Operations (MRO) inventory is often overlooked, until it becomes a problem. Whether it’s unexpected stockouts, a ballooning inventory value, or teams wasting time hunting down spare parts, poor MRO inventory management ends up costing more than most organizations realize.

In this article, we’ll break down when and why it’s the right time to optimize your MRO inventory, what challenges you might be facing without even knowing it, and how to get started with a structured, data-driven approach.

Understanding MRO Inventory Optimization

What is MRO inventory?

MRO inventory includes all the materials, components, tools, and spare parts used to support maintenance and operations but that do not directly contribute to the finished product. Examples include bearings, lubricants, filters, valves, fasteners, motors, and more.

What does “optimization” mean in this context?

MRO inventory optimization involves aligning inventory levels, part criticality, and availability with actual operational needs. The goal is to ensure the right parts are available at the right time, while avoiding excessive inventory, obsolete items, and hidden costs.

Signs It’s Time to Optimize Your MRO Inventory

If you’re experiencing any of the following symptoms, your inventory might be due for a strategic overhaul:

1. A significant rise in inventory carrying cost
   This includes not only the total value of items in stock but also hidden costs such as storage, insurance, handling, and obsolescence. Like a “payroll burden,” MRO inventory generates financial pressure that’s often invisible on a balance sheet until it’s too late.
2. Frequent stockouts or emergency purchases
   If planners or technicians are frequently ordering parts outside the procurement process or expediting shipments, it signals a disconnect between what’s stocked and what’s actually needed.
3. Difficulty finding spare parts during maintenance
   Inaccurate location data, duplicated part numbers, or outdated naming conventions can turn routine maintenance into a scavenger hunt.
4. Lack of reliable data
   If you can’t easily identify which parts are critical, which are slow-moving, or which suppliers are underperforming, you’re flying blind.

Best Moments to Start an MRO Optimization Initiative

While it’s always a good time to improve inventory management, certain strategic moments can accelerate your efforts and improve ROI:

When Implementing a CMMS, ERP, or APM System

Introducing a new asset management or enterprise system is the perfect opportunity to clean and align your MRO data. These systems depend on clean, structured data to be effective, starting fresh ensures you’re not importing legacy chaos into a new platform.

When Transitioning to Predictive or Condition-Based Maintenance

Predictive and condition-based strategies rely on detailed failure mode data. Aligning your MRO inventory with these strategies means stocking the right parts for the most likely failure scenarios, not just historical habits.

After Mergers, Acquisitions, or Major Site Changes

Any structural change introduces a chance to consolidate inventory, eliminate duplicates, and standardize SKUs across multiple plants or systems.

During Budget Planning Season

MRO inventory represents a significant and often untapped source of savings. During planning season, optimization initiatives can be tied to cost-saving goals, helping justify strategic investments.

Conclusion

MRO inventory optimization is more than just trimming stock, it’s a strategic enabler for maintenance excellence. By optimizing your inventory, you reduce cost, increase uptime, and align your spare parts with how your plant actually operates.

Many organizations delay optimization because they believe it requires a major overhaul. In reality, the best time to start is when you notice the warning signs, or when you’re already making a change in systems, strategy, or structure.

Looking to start optimizing your MRO inventory? How to Get Started With MRO Inventory

Frequently Asked Questions (FAQ)

How often should MRO inventory be reviewed or re-optimized?

Ideally, MRO inventory should be reviewed annually, or at least during major changes like new system implementations or site expansions.

What KPIs should I track to measure MRO inventory performance?

Some common KPIs include Inventory Turnover Ratio, Service Level %, Stockout Frequency, Inventory Value as a % of Revenue, and % Obsolete Inventory.

What’s the difference between optimizing MRO inventory and just reducing stock?

Optimization is strategic: it balances availability with cost and risk. Stock reduction without analysis can increase the risk of unplanned downtime.

What are common mistakes companies make when optimizing MRO inventory?

• Focusing only on cost reduction
• Ignoring part criticality
• Failing to engage stakeholders (maintenance, procurement, storeroom staff)
• Treating optimization as a one-time project instead of an ongoing process

How long does an MRO inventory optimization project usually take?

Depending on the size and complexity, projects can range from 6 to 12 weeks for a single site, or longer for multi-site optimization.

Raphael Tremblay,
Spartakus Technologies
[email protected]