A universal 5P8500 key by GX-AFTER, designed for most Caterpillar (CAT) construction machines. It is one of the most popular keys in the industry, fitting ignition switches, cab door locks, fuel cap padlocks, and service access panels on a wide range of excavators, loaders, dozers, and other CAT equipment.
GX-AFTER is the smart choice for your machine. We provide high-class replacements that combine excellent quality with an attractive price. Each part is carefully verified to ensure full compatibility and reliability you can depend on.
| Brand | Machine Type | Example Models / Series |
|---|---|---|
| Caterpillar (CAT) | Mini Excavators | 301.5, 301.6, 301.8, 302, 303.5, 304, 305, 305.5, 306, 307, 308, 309, 310 |
| Caterpillar (CAT) | Backhoe Loaders | 414, 415, 416, 420, 422, 424, 426, 428, 430, 432, 434, 440, 444, 450 (Series E, F, F2) |
| Caterpillar (CAT) | Tracked Excavators | 311, 312, 313, 314, 315, 316, 317, 318, 319, 320, 321, 322, 323, 324, 325, 326, 327, 328, 329, 330, 335, 336, 340 (and larger) |
| Caterpillar (CAT) | Wheeled Excavators | M313, M314, M315, M316, M317, M318, M319, M320, M321, M322, M323 |
| Caterpillar (CAT) | Wheel Loaders | 901, 902, 903, 906, 907, 908, 910, 914, 916, 918, 920, 924, 926, 928, 930, 938, 950, 960, 962, 966, 970, 972, 980, 982, 988, 990 |
| Caterpillar (CAT) | Other Machines | Dozers (D series), Graders (M/H series), Articulated Dump Trucks (7xx series), Rollers, Pavers, Skid Steers, Telehandlers (TH), Generators |
The model list is for reference. The 5P8500 key has been the industry standard for most CAT machines for decades.
If your old key struggles to turn in the lock, consider replacing the ignition switch or the door/cap lock cylinder. Often, the wear is in the lock mechanism itself, not just the key.
Using a heavily worn or bent key can lead to it breaking off inside the ignition or lock. Removing a broken key tip is difficult and often requires replacing the entire component (switch/cap), generating unnecessary costs and downtime.
The 5P8500 key is the basic tool for accessing and starting the machine. In most CAT machines, this single key opens the cab doors, engine service panels, fuel cap, and operates the ignition switch. Its universality is a huge advantage for fleet operators.
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It fits the vast majority of CAT machines produced from the 1970s to today. There might be a few exceptions (e.g., very old machines or specific series with unique locks), but 5P8500 is considered the industry standard for CAT.
Yes, on most CAT machines, the same key opens the fuel cap (if it's locking), cab doors, and operates the ignition.
Do you have doubts or need confirmation to avoid costly downtime? Call us. Our experts will help you select the right part to get your equipment back to work as quickly as possible.
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The key fsuitable for CAT machines, has universal use, fits the ignition, doors, hatch and fuel filler cap.

















