Genuine Cummins Parts — NOS Turbos, Injection, Engine & Electrical

How our Cummins part numbers work

If you searched a bare Cummins number like 4988274 or 3802696 and landed here, you are in the right place. Every Cummins part in our system carries a CN prefix ahead of the factory number: CN4988274 is Cummins alternator 4988274, CN3963965 is Bosch injection pump 3963965. Strip the CN and you have the original OEM Cummins (or Cummins/Holset, Cummins/Bosch) number. Where a stock number ends in RX, such as CN3802696RX or CN211915RX, that is the Cummins or Holset factory part number as it left the plant — the RX suffix is part of the genuine number, not a sign the part was rebuilt.

Many of these parts also carry cross-reference numbers from Cummins revisions or from the underlying supplier — for example our Bosch injection pump CN3963965 crosses to Bosch 0460424287 and 0430424255. Search either the Cummins number or the cross reference and you should find the same listing. The fastest way to check our inventory is to search on our eBay store or browse the full parts catalog. If a number does not turn up, ask anyway — we have thousands of parts on shelves that are not listed online yet.

New old stock — not rebuilt, not aftermarket

Everything on this page is genuine Cummins new old stock (NOS): new, unused parts pulled from surplus inventory, not remanufactured cores and not aftermarket copies. Cummins engines turn up in construction equipment, mining trucks, agricultural machinery, over-the-road trucking, and standby generator sets, and each of those applications is unforgiving of a turbo or injection pump that does not match factory tolerances. Standout pieces in this batch include Holset turbochargers (the HX35W and the HX40 wastegate unit), a Bosch-built injection pump, and a Vibratech torsional vibration damper — all genuine, all NOS.

Cummins parts in stock

Each row links to the live listing. Cross-reference numbers are shown where a part crosses to another number.

Alternators

Turbochargers

Engine & fuel parts

Electrical & controls

More Cummins parts

A few more Cummins items — including flywheel ring gear CN5566, front engine support CN3943248, and CN3803402RX — plus everything else we sell, are in the full parts catalog. We also stock NOS starters and alternators for other diesel makes on our starters & alternators page, and hard-to-find Euclid-Hitachi rigid hauler parts.

Not sure it fits? Send your engine serial number

Cummins parts cover an enormous range of engine families and build lists — construction, mining, agricultural, on-highway trucking, and generator set applications can all call for a different revision of the same basic part number. Rather than guess, send us your engine serial number along with the part number or cross-reference you think you need. We verify fitment against the serial before anything ships, which is a lot cheaper than freight on a return. It takes one phone call to (210) 942-3553 or an email to sales@satxpartsandsupply.com.

Shipping is quoted by location — include your ZIP code and we will price freight or parcel from San Antonio to your door, anywhere in the US. And if you are sitting on Cummins surplus of your own, we buy inventory too: see sell us your surplus.

Cummins parts FAQ