Your maintenance tech looks up the part number and finds a “no longer available” where the price used to be. Or even worse the OEM no longer exists and part is now obsolete. Your machine is offline, your production schedule has not moved. The problem is now yours.
Custom Concepts Machining helps manufacturers and agricultural farms across Windsor-Essex County with this very problem, every month. Discontinued parts have four replacement options, not just one. Each option carries a different price, a different wait time, and a different risk. Choosing the wrong one costs more than the OEM parts you set out to replace.
Why OEMs Discontinue Parts Without Warning
An Original Equipment Manufacturer retires OEM parts for different business reasons. Tooling wears out. A supplier closes. Volume drops too low to justify a production run. A newer machine platform replaces the old one. Companies fold or go under… and you rarely hear about it in advance, because the notice goes to their equipment dealers, not to you.
Most builders promise OEM parts support for seven to ten years after the last machine ships. When that window closes, remaining stock sells off and the part number goes dark. A machine that runs well for twenty years spends its second decade with no OEM factory support. Every repair after that depends on a source you find yourself.
Option 1: Aftermarket Parts:
Aftermarket parts are new components made by a company other than the original builder, produced to fit the same application. They usually cost less than OEM parts and ship from stock. That makes them the fastest low-cost option, when a supplier exists.
They work best for ordinary wear items on common equipment: bearings, seals, belts, sprockets, and standard fasteners.
The catch is coverage. Aftermarket suppliers build what sells in volume, so proprietary assemblies, low-run machinery, and custom-engineered parts & components almost never appear in a catalogue. Quality also varies between suppliers. A part that measures close but not exact creates a major compatibility problem for your broken equipment. The mismatch pushes load into neighbouring components and shortens their life as well, only compounding the parts problem. You should always check material, hardness, and fitment against manufacturer standards before you order a full run. A part that installs is not always a part that gives you the performance the assembly needs.
Option 2: Remanufactured Components:
Remanufacturing rebuilds a used component back to its original spec. The supplier strips it down, replaces the worn pieces, and re-machines the surfaces that matter. Warranty is usually close to new, with performance matched to the original specification.
This works when the expensive part survives. Gearboxes, hydraulic cylinders, servo drives, pumps, sensor housings, and spindle units all have a core casting or housing worth saving. Only the wear surfaces need repair. This is where custom concepts can help, spec out new replacement parts and deliver on quality.
The limit is cores. You need your failed unit back or a matching one from the supplier, and a cracked or corroded core ends the conversation. Turnaround also takes longer than pulling stock off a shelf. Plan remanufacturing as scheduled repair and spare rotation, because it will not save a line that is down today.
Option 3: Surplus and New Old Stock:
New old stock is genuine factory OEM parts that were never installed and still sit unused, held by surplus dealers or other offshore factories. Price depends on scarcity. Common items run about 10 percent under original list. Rare ones sell for more than 200 percent above it.
The advantage is that it is the real thing. No compatibility review, no material substitution, no engineering sign-off. For regulated equipment, that certainty matters.
The problem is that there is no second order. Prices climb as stock thins. Condition depends on how it was stored. Seals and lubricants age on the shelf, and performance after years in a warehouse is hard to predict. Warranty coverage is usually gone. Use surplus to buy time while a permanent fix gets engineered. Do not build a supply plan on it.
Option 4: Reverse Engineering:
Reverse engineering measures an existing part and rebuilds it as a CAD model you can machine from. Once the template or model has been made, we can start to manufacture the old part. If you do a batch, pricing of the parts decrease, because the engineering time is shared across every unit.
That multiplier is what people react to. It is also the one most often misread. The engineering is a one-time cost. Once the model, the toolpath, and the inspection method exist, the second run prices like normal production. Order fifty pieces and the design cost splits fifty ways.
How the Reverse Engineering Process Works
- Measure the failed part, including any features worn away that we rebuild from the components around it.
- Model it in SolidWorks, correcting the original design where the failure points to a weakness in performance.
- Confirm material and heat treatment, then choose stock that meets or beats the original specification.
- Program toolpaths in Mastercam and cut a first article to prove the fit in your assembly.
- Run the batch, then archive the model and program files so the next order goes straight to production.
Reverse engineering also solves what the other three cannot. Some parts exist nowhere, in any catalogue or condition. When the drawings are gone and the builder is gone, a physical sample and shop experience are enough to start.
Comparing the Four Options Side by Side
Price alone is a poor way to decide. Compare the options on four points: cost against OEM parts, lead time, whether you can order it again, and how closely it holds original performance.
|
Option |
Cost vs OEM parts |
Availability |
Repeatable Supply |
|---|---|---|---|
|
Aftermarket |
20 to 50 percent lower |
Stock, if catalogued |
Yes, while produced |
|
Remanufactured |
30 to 60 percent lower |
Depends on core |
Yes, with cores |
|
Surplus / New Old Stock |
10 percent lower to 200 percent higher |
One-time, finite |
No |
|
Reverse engineering |
3x to 4x on single parts, far lower per unit in batches |
Built to order |
Yes, permanently |
How to Choose the Right Option for Your Line
Match the option to the failure. Buy aftermarket for catalogued wear items. Remanufacture high-value assemblies when the core is sound. Use surplus when only exact OEM parts will do. Reverse engineer anything that has failed twice or has no supplier at all.
Four checks before you spend:
- Work out your downtime cost per hour, then compare it against each option’s lead time instead of the sticker price.
- Count how many of these parts you will need over three years, since repeat demand favours a permanent machined solution.
- Check whether the part is a repeat offender, because something that fails on a schedule has a design weakness worth fixing.
- Confirm the option satisfies your documentation and traceability rules.
A worn bushing on a spare conveyor deserves a different answer than a drive component on the line carrying 60 percent of your output. Custom Concepts Machining scopes both, and sometimes the honest answer is to buy the aftermarket part instead of machining it.
Frequently Asked Questions
How long does it take to reverse engineer a discontinued part?
Most single parts go from measurement to first article in one to three weeks. Geometry, material availability, and heat treatment set the pace. Urgent repair runs of 2 to 20 pieces move faster when the part is simple and the material is on hand.
Do I need drawings to have obsolete OEM parts remade?
No. A physical sample is enough, even a broken one. We rebuild missing features from the mating components and the wear pattern. Drawings speed the work up but are not required.
Is a machined replacement as strong as the original?
It can be stronger. Reverse engineering lets us upgrade the material, correct the fillet radii, and improve heat treatment exactly where the original failed. Performance improves while the part keeps full compatibility with the assembly around it.
What is the minimum order for a custom machined part?
One. Single-piece emergency work and batch runs of 50 to 500 both fit normal shop workflow. Per-unit pricing improves with volume as engineering and setup spread across the run.
Put a Permanent Supply Behind Your Obsolete Components
Discontinued parts stop being an emergency once you have a repeatable source you can rely on. Send a photo, a broken part sample, or a drawing to us and we will quote material, timeline, and unit pricing.
Our Leamington shop at 4 Iroquois Road handles CNC milling, CNC turning, reverse engineering, and batch production. We serve manufacturers across Windsor-Essex County, Ontario, and the United States, with performance and quality standards recorded on every run.
Call (519) 325-0804 to book an appointment or talk through the OEM parts you can no longer source online.
