An aftermarket parts strategy is how an industrial OEM systematically identifies, prices, and sells replacement parts and components into its existing customer base – moving beyond reactive order-taking to proactive, data-driven revenue generation. Aftermarket parts strategies cover which accounts to target, what parts to offer, when to engage, and how to price – all informed by what’s actually installed in the field.

The stakes are hard to overstate. Spare parts typically deliver gross margins of 30–50%, compared to 15–25% on new equipment. For many OEMs, parts are the single largest contributor to aftermarket profit. Yet research suggests that manufacturers are mispricing as many as 73% of their parts SKUs – leaving margin on the table on nearly three out of every four parts they sell. Meanwhile, third-party parts suppliers are growing aggressively, with the independent aftermarket expanding at over 9% annually as customers look for faster, cheaper, and more accessible alternatives to OEM channels.

This isn’t a problem OEMs can solve with better catalogs or faster quoting alone. It requires a fundamentally different approach to how parts revenue is identified, pursued, and protected. This article lays out five strategies that industrial OEMs are using to do exactly that.

Why Aftermarket Parts Revenue Is the Highest-Margin Opportunity Most OEMs Ignore

New equipment sales get the attention. They’re big-ticket, high-visibility, and tied to quota. But they’re also cyclical, capital-dependent, and margin-thin. Parts revenue is the opposite: recurring, stable, and structurally high-margin. A pump that costs $50,000 new will consume multiples of that in replacement parts, seals, bearings, and service components over a 20-year operating life.

The math is straightforward. Research across industrial sectors shows that OEMs should earn as much in aftermarket revenue as the original equipment cost within the first ten years after sale. The best-performing OEMs have doubled their aftermarket lifetime value within three to five years by systematically activating their parts strategies – even in the face of intense third-party competition.

Yet most OEM organizations still treat parts as a fulfillment function, not a growth engine. The parts team fills orders that come in. Sales reps focus on new equipment pipeline. No one is proactively identifying which existing customers are underbuying parts relative to their installed equipment, or which accounts are quietly shifting their spend to third-party suppliers. The result is a margin engine that leaks revenue from multiple points – slowly, invisibly, and at scale.

The Data Problem: You Can’t Sell Parts to an Installed Base You Can’t See

Every parts strategy in this article depends on one prerequisite: knowing what’s installed in the field. Which customers have which equipment, what vintage, what configuration, and what their purchasing history looks like against what they should be buying.

This is where most OEMs hit a wall. Equipment shipment records sit in ERP. Customer contacts live in CRM. Service history is in the field service system. Dealer and distributor records are separate entirely. And the person who knew which pump models were running at the Baytown refinery retired three years ago – taking that knowledge with them.

Without a unified view of the installed base, parts strategies default to reactive: wait for the customer to call, look up what they ordered last time, and fill the order. That’s not a strategy. That’s a call center. The five strategies below require a different foundation – one where you can see your entire installed base, segment it, and act on it. (For a deeper look at how installed base analytics provides that foundation, see our companion article: Installed Base Analytics: The OEM’s Most Underused Growth Lever.)

Five Aftermarket Parts Strategies That Drive Measurable Revenue Growth

1. Segment Your Installed Base by Parts Revenue Potential

Not every account deserves the same level of outreach. The OEMs growing parts revenue fastest are the ones segmenting their installed base by equipment age, lifecycle stage, and historical purchasing behavior – then concentrating sales effort where the gap between actual spend and expected spend is widest.

An account running fifteen-year-old compressors that hasn’t ordered a rebuild kit in three years is a fundamentally different opportunity than a new customer still under warranty. Segmentation makes this visible. It tells you which accounts have the highest parts revenue potential and which ones are already buying at expected levels. Without it, sales teams spread effort evenly across the base – which means they’re overserving low-potential accounts and underserving high-potential ones.

2. Forecast Parts Demand Before the Customer Calls

Reactive parts selling means waiting for the phone to ring. Proactive parts selling means knowing what the customer will need before they do – because you know what equipment they operate, how old it is, what the typical maintenance intervals are, and what parts are consumed at each interval.

This is where installed base data transforms from a record-keeping exercise into a demand signal. When you can model parts consumption patterns against equipment lifecycle data, you can generate outbound selling motions that arrive at exactly the right moment: just before the customer would have called, or just before they would have sourced the part from someone else. OEMs that bundle this with maintenance kits – pre-configured part sets matched to specific service intervals – report higher share of wallet per intervention and stronger demand forecasting accuracy because maintenance cycles become the basis for planning.

3. Defend Against Third-Party Parts Displacement

Third-party parts suppliers aren’t winning because their parts are better. They’re winning because their buying experience is easier, faster, and more available. Research shows that 74% of B2B buyers would switch suppliers if another offered a better digital purchasing experience. For parts, that translates directly: when an OEM’s quoting process takes 48 hours and a third-party supplier has the part in stock with same-day shipping, the customer doesn’t agonize over brand loyalty.

One benchmarking study found that a major manufacturer had parts availability of just 68% – against an industry threshold of 95%. Four in ten of that OEM’s customers cited part unavailability as the reason they went to a competitor. And the displacement often happens invisibly: a dealer doesn’t have the genuine part in stock, substitutes a third-party alternative to keep the customer happy, and the OEM never sees the lost sale.

Defending against this requires two things: visibility into which accounts are showing declining parts purchase patterns (a leading indicator of competitive displacement), and the ability to intervene with targeted offers that emphasize what third-party suppliers can’t match – OEM engineering specifications, warranty protection, and equipment-specific fit guarantees.

4. Convert Warranty Expirations Into Paid Parts Relationships

The warranty period is when OEMs have maximum customer engagement and maximum lock-in on genuine parts. When the warranty expires, both disappear – unless you have a systematic conversion program in place.

The most effective approach treats warranty expiration as a sales trigger, not an administrative event. Ninety days before expiration, the customer receives a targeted offer: an extended warranty that covers specific high-value components, bundled with a parts agreement that ensures continued supply of genuine replacements. The OEM leverages its knowledge of the installed equipment to select which components to include – choosing parts that are least prone to failure but most complex and expensive to replace. Customers value this because it protects them from catastrophic repair costs. The OEM benefits because it creates ongoing lock-in on genuine parts at a low incremental cost.

Without this conversion motion, warranty expiration is the moment competitors step in. The customer’s original commitment to the OEM expires, and every subsequent parts purchase becomes a competitive decision. OEMs that don’t own this moment will lose it.

5. Identify Cross-Sell Gaps Across the Installed Equipment Profile

Most OEMs track parts revenue at the account level. Fewer track it at the equipment level. The difference matters enormously.

When you can map each customer’s installed equipment profile against their parts purchasing history, you can identify specific gaps: this customer operates twelve of your centrifugal pumps but only orders seal kits for eight of them. Those four pumps are either being serviced by someone else, are sitting idle, or are consuming parts the customer is sourcing from a third party. Each scenario is a specific, actionable revenue opportunity.

Cross-sell analysis also reveals adjacent product opportunities. A customer buying impeller replacements may not know you offer wear rings, bearing assemblies, or monitoring accessories for the same equipment. The data exists to surface these gaps automatically – but only if you have equipment-level visibility into the installed base, not just account-level transaction history.

How Smart Parts Pricing Complements Proactive Selling

A strong parts strategy identifies the right opportunities. Smart pricing captures the margin those opportunities represent. The two are inseparable, yet most OEMs price parts using cost-plus formulas that haven’t been updated in years – if they’ve been formally structured at all.

The biggest pricing opportunity for most OEMs sits in the long tail: thousands of SKUs with low individual sales volume but constant demand, often for aging equipment where competitive alternatives are limited. These parts typically carry the highest margin potential because customers have few substitution options, yet many OEMs price them with the same blanket markup applied to high-volume commodity parts. A benchmarking analysis across ten industries found that OEMs can improve EBIT margins by 3 to 10 percentage points through data-driven repricing – with the highest gains coming from long-tail SKUs. One industrial machinery OEM repriced 100,000 spare parts SKUs and improved its EBIT margin by two full percentage points within a single year.

On the other end of the spectrum, high-volume commodity parts – filters, gaskets, common fasteners – need competitive pricing to prevent displacement. These are the parts where third-party suppliers compete most aggressively and where price transparency is highest. The pricing discipline is different: match the market on high-runners to retain the customer relationship, then capture margin on the long-tail parts where the OEM has a natural advantage.

Connecting Parts Strategy to Inventory Optimization

Parts revenue and parts availability are two sides of the same problem. An OEM can have the best segmentation, the sharpest pricing, and the most proactive sales team – and still lose the sale because the part isn’t in stock when the customer needs it.

The connection to installed base data is direct. When you can predict demand based on what’s installed, what age it is, and what the consumption patterns look like, you can stock smarter: higher fill rates on the parts that matter, lower carrying costs on the parts that don’t. The alternative – stocking based on historical order patterns without installed base context – leads to the worst of both worlds: excess inventory on slow-moving SKUs and stockouts on the critical parts that drive customer decisions about where to buy.

This also feeds directly into the third-party displacement problem. Every stockout is an invitation for a competitor to step in. When a customer needs a part urgently and the OEM can’t deliver, the dealer or distributor will source a substitute – and the OEM loses the sale, the margin, and a piece of the customer relationship, often without ever knowing it happened.

From Reactive Order-Taking to Predictive Parts Revenue

The five strategies above share a common thread: they all require shifting from a reactive model (wait for the order, fill the order) to a proactive one (identify the opportunity, pursue the opportunity, protect the relationship). That shift is operational, not conceptual. It changes how sales teams spend their time, how parts are priced, how inventory is allocated, and how success is measured.

The OEMs making this shift are not necessarily the largest or the most digitally mature. They are the ones that have connected their parts strategy to their installed base – so they can see which accounts represent the highest revenue potential, predict what those accounts will need next, and deploy sales effort where it will generate the highest return. The data shows this works: OEMs that applied these levers systematically have doubled their aftermarket lifetime value within three to five years, without new product development, new markets, or significant capital expenditure.

If your parts revenue has plateaued or your attach rates are declining, the issue is rarely market demand. Customers need parts. Equipment wears out. The question is whether they’re buying those parts from you – or from someone who showed up faster, quoted sooner, and made it easier to buy.

Frequently Asked Questions

The Bottom Line

Industrial OEMs don’t have a parts demand problem. Equipment ages, components wear, and customers need replacements – that demand is structural and ongoing. What most OEMs have is a parts capture problem: the inability to see which customers need what, when they need it, and whether they’re buying it from you or from someone else.

The five strategies in this article – segmentation, demand forecasting, displacement defense, warranty conversion, and cross-sell analysis – are not theoretical. They are the operational levers that the highest-performing OEMs use to capture parts revenue that would otherwise leak to third-party competitors, go unsold, or get left on the table through mispricing. Each one starts with the same foundation: a clean, unified view of the installed base.