The Honda 90504-ZA0-000 Washer (10.5MM) is a genuine OEM replacement designed for a wide range of Honda generators, welder generators, power carriers, and lawn tractors. As a direct Honda OEM part, it is manufactured to the same specification as the original, ensuring a correct fit without modification. This washer is listed for models including the EB10000, EB3500, EB3800, EB4000, EB5000, EB6500, EG3500, EG4000, EG5000, EG6500, EL5000, EM3500, EM3800, EM4000, EM5000, EM6000, EM6500, EN3500, EN5000, ES6500, EW140, EW171, EX3300, EX4500, EX5500, EXW171, EZ3500, EZ5000, HP250, HP400, HT3810, HT3813, and HT4213. Because Honda supersedes hardware at production breaks, confirm the part number 90504-ZA0-000 against your unit's serial number before ordering.
Key Features
- Genuine Honda OEM Hardware — sourced directly from Honda, this washer meets the same dimensional and material requirements as the part it replaces, keeping fastener assemblies properly loaded.
- Broad Fitment Coverage — listed for Honda generators, welder generators, power carriers, and lawn tractors across dozens of models, including the EB, EG, EM, EN, ES, EW, EX, EZ, HP, and HT series.
- Verify Serial Number Before Ordering — Honda updates hardware specifications at production breaks; check your machine's serial number against the fitment table to confirm part number 90504-ZA0-000 is correct for your specific unit.
A washer distributes the clamping load of a fastener across a wider surface area, protecting the mating material and maintaining consistent clamp force over the life of the assembly. In equipment such as generators, power carriers, and lawn tractors, properly seated hardware prevents fasteners from loosening under vibration and load cycles. Using the correct OEM-spec washer ensures the fastener assembly performs as Honda intended; an undersized or incorrect washer can allow a fastener to work loose or damage the surface it bears against.
Part Details
| Part Number | 90504-ZA0-000 |
|---|---|
| Brand | Honda |
| Part Type | Genuine OEM |
| Description | Washer (10.5MM) |
Compatibility & Fitment
| Name | Models | Serial Range |
|---|---|---|
| Generator | EB3800, EB4000 | 1024094-9999999 |
| Generator | EB3500, EB5000, EB6500, EB10000, EG3500, EG4000, EG5000, EG6500, EL5000, EM3500, EM3800, EM4000, EM5000, EM6000, EM6500, EN3500, EN5000, ES6500, EX3300, EX4500, EX5500, EZ3500, EZ5000 | All |
| Lawn Tractor | HT3810, HT3813, HT4213 | All |
| Power Carrier | HP400 | 2302010-9999999 |
| Power Carrier | HP250 | All |
| Welder Generator | EW140, EW171, EXW171 | All |
Verify Before You Order
Fitment is machine-number and revision-specific; always confirm your model and serial number against the fitment list.
Why Buy From DHS Equipment
Every part is verified against the manufacturer's part number before it ships, so what you order is what arrives. We carry parts from leading OEM brands and our own DHS Quality Parts line of professional aftermarket components. Need help finding the right part? Our team is available to confirm compatibility whenever you need it. Orders are processed fast to keep your jobs on track. We don't just sell parts. We keep you jobsite ready.
Questions? Contact our team at [email protected] or 866-611-9369 — DHS Equipment is here to help you maintain peak performance.
