In Stock (Melbourne)
|Dispatches Same Day (Order before 11AM)
When it comes to keeping your Kubota excavator digging, swinging, and lifting without downtime, the quality of your pivot pins is non-negotiable. Big Power Parts proudly supplies the Excavator Pin Kubota U55-4 KX057-4 Boom-to-Arm Pin — a precision-machined, direct-fit replacement built to handle the brutal loads of daily earthmoving. Manufactured from hardened alloy steel, this pin matches the original factory dimensions of 55 mm diameter × 250 mm length, ensuring perfect fitment without slop or binding. Whether you’re on a construction site in Melbourne or working remote in Queensland, we stock this pin locally and ship Australia-wide with fast daily dispatch.
Our pin replaces genuine Kubota part numbers RD551-66562 and RD551-66560 — saving you hundreds of dollars without compromising strength or lifespan. Each pin is machined to tight tolerances and features a smooth surface finish to reduce wear on bushings and bosses. The result is less grease consumption, extended service intervals, and a quieter, more stable boom-to-arm connection. Backed by a 1-year replacement warranty (parts only, no labour coverage), you can order with confidence.
Big Power Parts only stocks pins that meet or exceed OEM hardness specifications. Our quality control checks every batch for dimensional accuracy, surface integrity, and hardness. The pin is shipped with protective coating to prevent corrosion during storage. If you need urgent replacement, we offer express shipping options so your machine is back in the dirt fast.
Below is a summary of the key specifications for this pin:
| Specification | Details |
|---|---|
| Part Name | Excavator Pin Kubota U55-4 KX057-4 Boom-to-Arm Pin |
| Genuine Part Numbers | RD551-66562, RD551-66560 |
| Pin Diameter | 55 mm |
| Pin Length | 250 mm |
| Material | Induction-hardened 1045 or 4140 alloy steel |
| Hardness | 50–55 HRC surface hardness |
| Finish | Black oxide / rust preventative coating |
| Compatible Machines | Kubota U55-4, Kubota KX057-4 |
| Warranty | 1-year replacement (parts only) |
Machine Compatibility List:
Need help confirming fitment? Our Melbourne-based parts specialists are available to cross-check your machine serial number against genuine Kubota parts diagrams. We understand that a wrong-sized pin can cause catastrophic joint failure, so we double-check every order before dispatch. When you order the Excavator Pin Kubota U55-4 KX057-4 Boom-to-Arm Pin from Big Power Parts, you get genuine local stock, real technical support, and fast delivery to your door — no waiting weeks for overseas freight. Order now and get your excavator back to full strength.
