MCE Resources

What Is MRO Inventory? A Guide to Efficient Spare Parts Inventory Management

Written by Motion & Control Enterprises, LLC (MCE) | Feb 25, 2025 12:30:00 PM

Critical spares are the unsung heroes of manufacturing operations. They are the backbone of uninterrupted production, ensuring every machine runs as planned. Without them, even the most sophisticated operations can grind to a halt. Proactively managing these components isn’t just smart—it’s essential. 

Effective inventory management is vital for maintaining seamless operations in manufacturing and industrial settings. Ensuring critical replacements are available when equipment fails prevents costly downtime and production delays. Without a proactive approach, businesses risk unplanned stoppages, increased expenses from expedited orders, and compromised safety.  

Partnering with a trusted supply and maintenance, repair and operations (MRO) services provider amplifies the benefits of a robust inventory strategy. Such a partner brings expertise, reliable sourcing, and tailored solutions that minimize stockouts and optimize supply chains. This collaboration can transform constant operational disruptions into a streamlined, efficient production process, safeguarding both productivity and profitability. 

>> Safety Implications of Ineffective Parts Inventory Management 

The High Cost of Missing Critical Spares   

Critical spares are the component parts critical to continued operations. Stockouts of replacement equipment disrupt line functions and come with numerous costs that add up to significant losses. 

Operational Downtime  

A missing critical spare can stop production in its tracks. Imagine a fluid power system shutting down because the right fitting isn’t available. The ripple effects—delayed projects, idle teams, and missed deadlines—can be devastating. 

Financial Losses   

Downtime costs add up quickly. Lost revenue, expedited shipping fees, and overtime for recovery can far exceed the expense of maintaining a well-stocked inventory.  

Production Strain 

The absence of critical spares creates chaos. Emergency procurement strains suppliers, stresses staff and reduces your overall efficiency. Recovery from these disruptions often takes longer than anticipated and can compound the damage. 

Reduced Customer Trust 

When deliveries delay due to equipment failures, customer relationships suffer. Repeated issues can permanently tarnish a brand’s reputation and can result in lost sales. 

Why Proactive Critical Spares Management Matters 

Critical spares are the parts whose failure and unavailability would contribute to significant operational disruption. It could be those pieces deemed “too big to fail,” or the smallest of component pieces required to keep production online: 

  • Worn-out seals that cause leaks 
  • Faulty sensors that misread critical data 
  • Missing bolts that hold machinery together 
  • Frayed belts that drive essential systems 

When these seemingly minor parts fail, the ripple effect can halt an entire production line. This risk highlights the critical importance of proactive spares management. 
 
Spare parts inventory management helps facilities ensure operational continuity. Imagine an MRO team that stays one step ahead of unforeseen equipment failures. Now imagine the positive impact on your bottom line. 

Preventing Downtime  

Keeping production lines running is a manufacturing imperative. While average downtime estimates vary—from $260,00 per hour to $9,000 per minute— organizations suffer when the unexpected occurs. According to a Siemens 2022 Report on the true cost of downtime, Fortune Global 500 companies racked up $129 million per facility in downtime, up 65% on from their last survey in 2019-20. They found the cost of a lost hour now ranges from an average of $39,000 for factories producing Fast Moving Consumer Goods, to more than $2m an hour in Automotive. A well-organized spare parts inventory ensures critical parts are available when you need them. 

Mitigating Risks   

Proactive parts management prevents unplanned stoppages that disrupt workflows and delay production. Managing critical spares reduces safety risks, like hydraulic line failures or equipment malfunctions. Better inventory management protects workers and keeps operations running smoothly. 

Enhancing Financial Stability  

Avoiding emergency orders cuts unnecessary costs and possible long lead times. Proactively stocking the right spares prevents costly expedited shipping and rush fees. For example, having spare automation accessories on hand avoids halting production and paying premium rates for overnight delivery. Predictable inventory expenses improve cash flow and allow better budget planning. 

Supporting Preventive Maintenance 

Aligning spare parts with maintenance schedules keeps equipment running longer. Replacing a worn belt or valve before failure avoids breakdowns and extends machine life. For instance, having replacement filters for HVAC systems ready ensures timely swaps, reducing downtime and preventing further damage. 

Best Practices for Managing Critical Spares

Effective critical spares management lessens downtime for smoother operations. A proactive approach keeps essential parts available without overstocking or wasting resources. These practices can streamline inventory and reduce production risks.   

Identify and Prioritize Critical Spares 

Failing to prepare is preparing to fail. Start by identifying parts essential for every level of operations. Focus on the components whose failure would halt production. For example, prioritize motors, hydraulic hoses, and sensors that keep key systems running.   

Establish Min-Max Levels   

Set minimum and maximum stock levels for critical spares. Use historical usage data to strike the right balance. For instance, maintaining three spare pumps ensures availability without overstocking. Base this metric on usage data, lead times, and the criticality of the equipment supported. 

Conduct Regular Audits and Condition Checks  

Inspect important and critical parts frequently to ensure they are in good condition. A faulty spare is as useless as no spare at all. For example, check seals for cracks or belts for wear during routine audits. Check filters to ensure they’re doing the job at capacity. 

Build Strong Supplier Partnerships 

Work closely with suppliers to reduce lead times. Reliable partnerships ensure quick access to parts when you need them the most. For example, negotiate stocking agreements for priority shipping of replacement bearings.   

Leverage Technology and Data  

Inventory software and data analytics can predict needs before they occur. Tools like barcode scanning or RFID tracking simplify inventory management. The software can flag when the stock drops below minimum levels, triggering automated reordering. 

Case Study: Streamlining Critical Spares Inventory for a Car Wash Manufacturer 

A car wash equipment manufacturer needed to consolidate over 100 suppliers into three. Their current process required multiple weekly purchase orders, causing inventory inefficiencies that risked stockouts. With increasing production demands, their team struggled to manage inventory and prevent downtime. They turned to MCE Automation for a solution.   

We implemented a Vendor-Managed Inventory (VMI) program to streamline purchasing. The VMI included a Proactive Inventory Stocking Agreement to reserve critical parts in our warehouse. This effort reduced lead times and ensured key components like tubing, fittings, and valves were always available. We centralized their inventory, organized it with labeled bins, and improved visibility for easier management.

The results were immediate. Weekly purchase orders dropped by 50%, cutting administrative costs and saving time. The customer avoided stockouts and maintained smooth operations. Access to Parker’s premium products further enhanced inventory reliability. The program's success led the customer to expand their partnership with MCE.   
 
>> Read the full case study. 

MRO Inventory Optimization with MCE: Reducing Costs and Ensuring Operational Continuity 

At MCE, we know critical spares keep operations running. Proactive inventory management of these component parts prevents production downtime and cuts costs. MCE offers various customizable inventory programs to create a tailored service that fits your business. Our strategies ensure the right parts are always on hand. We help businesses stay prepared. Here’s how.   

Proactive Stocking Agreements

MCE partners with customers to reserve critical spares based on specific algorithms. This approach ensures uninterrupted operations while simplifying inventory management across multiple locations. 

Dynamic Min/Max Levels

MCE adjusts stock levels dynamically, reflecting real-time consumption patterns. It's a systematic science that ensures clients avoid overstocking while guaranteeing parts' availability. The result? Lower storage costs and higher operational reliability. 

Efficient Storage Solutions

MCE reorganizes customer inventories for better visibility and access. For an aerospace manufacturer, MCE used color-coded bins to separate fittings by thread type. This approach reduced errors and bridged language barriers among staff, improving safety and efficiency. 

Technology-Driven Solutions

MCE uses advanced digital tools to streamline inventory management. For example, the Clear Spider app allows barcode scanning for real-time inventory updates. It also automates reordering, ensuring stock levels stay consistent without manual tracking. For select clients, MCE provides RFID-enabled bins that automatically trigger reorder requests when emptied, ensuring restocking without manual intervention. These technologies simplify processes and keep critical parts readily available.   

Customer- and Vendor-Managed Inventory

MCE offers flexible inventory solutions to fit any need. With our VMI program, we can handle stock levels to ensure critical parts are always available. Outsourcing critical spares management reduces stockouts and eases your administrative work. Our Customer-Managed Inventory (CMI) program streamlines self-management for those who prefer control. Clients get the tools they need to stay efficient and organized while we provide expert support. 

Better spares management means better business continuity. MCE Automation delivers solutions that keep your production lines moving and your bottom line thriving. 

Don’t let missing critical spares disrupt your operations. Evaluate your current inventory management approach today. Contact the experts at MCE Automation to set up a proactive critical spares management plan. Together, we can ensure your operations never miss a beat.   

>> Contact us to get your critical parts when you need them.