Heavy Equipment Keys: Which Key Fits Your Machine?

Here is the open secret of the equipment world: most heavy equipment keys are matched to the brand, not the machine. One Bobcat key starts nearly every modern Bobcat, one classic CAT key fits generations of Caterpillar iron, and the same is true across most major brands. That is why replacement keys cost little, why master key sets exist, and why losing your key is an inconvenience instead of a crisis.

Quick Facts

• Keys are per brand, not per machine: most ranges share one common key
• The famous examples: Bobcat 6693241, CAT 5P-8500, John Deere AR51481
• Master key sets: one ring covers a mixed fleet
• Ordering: match the OEM key number stamped on your current key or listed in your manual
• We stock 145 replacement keys across the major brands

Are All Heavy Equipment Keys the Same?

Within a brand, very often yes. Unlike cars, where every vehicle gets a unique cut, equipment manufacturers issue common keys across huge portions of their ranges. A rental fleet, a dealership yard, and a landscaping crew can each run a dozen machines on a single pocketed key.

Across brands, no. A Bobcat key does not start a Deere, and a CAT key does not start a Komatsu. That is exactly why the aftermarket sells multi-brand master sets: one ring, one key per brand, whole jobsite covered.

Are Excavator Keys Universal?

Excavator keys follow the same brand logic. Most Takeuchi excavators share a common key (OEM 17001-00019), Volvo machines run a small family of keys by era, and Komatsu equipment commonly uses its well-known 08068-00002 pattern. "Universal" within the brand's range is the norm; universal across all excavators is a myth.

The practical consequence for owners: if you buy a used excavator with no key, you usually do not need a locksmith. You need the brand's common key, which is a stocked, inexpensive part.

Which Key Does Each Brand Use?

These are the common keys we see ordered again and again, each one a part we stock, cross-referenced to the OEM number:

Brand	Common key (OEM number)	Typical coverage
Bobcat	6693241 (ignition and door)	Most modern Bobcat loaders and excavators
Caterpillar	5P-8500	The classic Cat machine ignition key, per Caterpillar's own parts catalog
John Deere	AR51481; also RE183935, AT194969 by family	Utility and construction ranges by era
Case	A77313, 1495442, 150979A1 by family	Skid steers, loaders, and backhoes by era
Takeuchi	17001-00019	Track loaders and excavators
Komatsu	08068-00002	Wide equipment coverage
Volvo	14529178, 11039228 (laser cut) by era	Construction equipment by generation

Kubota equipment likewise runs common keys by range, and older machines of every brand can differ by generation. When in doubt, the OEM number on your existing key or in your operator's manual is the truth. It is the customer's responsibility to verify part compatibility before purchasing, and keys are the easiest verification in the catalog: match the number.

What Key Is 5P-8500?

5P-8500 is Caterpillar's machine ignition key, one of the most recognizable part numbers in the industry. Caterpillar's parts catalog lists it plainly as the machine ignition key, and it fits generations of Cat equipment. If you run older or mixed-age Cat iron, this is the key on your ring.

Why Do Manufacturers Use Common Keys?

Because equipment lives a different life than a car. Machines are shared by crews, moved between operators mid-shift, rented by the week, and started by whoever is closest when a trailer needs loading. Unique keys would create constant downtime for zero practical benefit on a fenced jobsite or a farm.

Manufacturers made the sensible trade: standard keys for operation, and security handled by other layers.

What About Machine Security Then?

The honest answer: the key in a heavy machine is a switch, not a lock. Real security comes from the layers around it:

• Locked cabs: door keys and lockable fuel caps (Bobcat even keys some fuel caps separately)
• Battery disconnects and hidden kill switches: the cheapest effective immobilizers
• Telematics: modern machines report location and can be geofenced
• Keypad and coded-start systems: increasingly common on late-model equipment
• Site discipline: lighting, cameras, and parking machines blade-to-blade

Based on what our customers tell us, the disconnect switch remains the best money-to-protection ratio on older machines.

What Is in a Master Heavy Equipment Key Set?

A master set is simply one ring carrying the common key for each major brand: the Bobcat, CAT, Deere, Case, Komatsu, and similar patterns in one bundle. Mechanics, transporters, auction yards, and mixed-fleet operators carry them so any machine on the lot starts without a hunt. We stock multi-key sets alongside the individual brand keys.

How Do I Find My Machine's Key Number?

Three reliable routes:

• Read the old key: most equipment keys carry the OEM number stamped on the bow
• Check the operator's manual: key numbers are listed with the machine's specifications
• Ask us with your serial number: email sales@partsonline.com and our parts specialists will identify the key your machine shipped with

Our serial number guides for Bobcat and Kubota show exactly where to find the serial plate.

Are Aftermarket Equipment Keys Any Good?

Yes, and this is one category where the question barely applies: an equipment key is a simple cut-metal part with no electronics on most machines. Aftermarket keys cut to the OEM pattern work identically and cost a fraction of dealer pricing. Ours meet or exceed OEM specifications, and every listing carries the OEM cross-reference so you can match your number exactly.

Frequently Asked Questions

Are all heavy equipment keys the same?

Within most of a brand's range, yes: one common key typically starts the fleet. Across brands, no; each manufacturer uses its own patterns, which is why multi-brand master sets exist.

Are excavator keys universal?

Within a brand, usually. Takeuchi, Komatsu, and Volvo excavators each run common keys across large ranges, but there is no single key that starts every excavator.

What key is 5p8500?

5P-8500 is Caterpillar's classic machine ignition key, listed in Cat's own parts catalog, and it fits generations of Cat equipment.

What are the different types of machine keys?

In engineering, "machine key" also means the small metal keys that lock shafts to hubs (sunk, saddle, tangent, round, and spline types). For equipment ignitions, the types that matter are the brand patterns: standard cut keys and, on some late Volvo and modern machines, laser-cut profiles.

What is a master set of heavy equipment keys?

One key ring carrying the common key for each major brand so a mixed fleet, transporter, or mechanic can start any machine on the lot.

Where can I find a heavy equipment keys chart?

The chart above lists the common OEM key numbers by brand: Bobcat 6693241, CAT 5P-8500, John Deere AR51481, Case A77313, Takeuchi 17001-00019, Komatsu 08068-00002, and Volvo's era keys.

Lost the key, bought a machine without one, or outfitting a service truck? Match your OEM number from the chart, or email your machine's serial number to sales@partsonline.com and our parts specialists will confirm the right key before you order. Browse replacement keys inside each brand's collection, starting with Bobcat parts, John Deere parts, and CAT parts.