The Honda 90504-SA0-000 Plain Washer (10MM) is a genuine OEM replacement built for a range of Honda generators, welder generators, and lawn tractors, including the EB3000, EB4000, EM3000, EM4000, EMS4000, EMS4500, EW170, HT3810, HT3813, and HT4213. Sourced directly from Honda, this washer matches the original specification exactly — no guesswork on dimensions or fit. Honda supersedes hardware at serial breaks, so confirm your machine's serial number against the fitment table before ordering.
Key Features
- Genuine OEM Honda Hardware — pulled from Honda's own parts inventory, this washer meets the same dimensional spec as the original installed at the factory.
- 10MM Bore, Exact Sizing — the 10MM inner diameter is sized for a specific fastener stack-up; an incorrect washer shifts load distribution and can allow fastener loosening over time.
- Broad Honda Fitment — listed for Honda generators including the EB3000, EB4000, EM3000, EM4000, EMS4000, and EMS4500, the EW170 welder generator, and HT3810, HT3813, and HT4213 lawn tractors.
- Verify by Serial Number — Honda updates hardware part numbers at production breaks, so cross-check your machine's serial number against the fitment table to confirm part number 90504-SA0-000 is correct for your unit.
A plain washer distributes the clamping load of a fastener across a wider surface area, protecting the material beneath the bolt head or nut and helping the assembly maintain consistent clamping force over time. In generators, welder generators, and lawn tractors, washers like this one appear at numerous assembly points where even load distribution keeps components securely seated through vibration and regular use. When a washer is missing, undersized, or worn flat, fastener preload drops, hardware can back out, and the components it retains may shift or loosen prematurely.
Part Details
| Part Number | 90504-SA0-000 |
|---|---|
| Brand | Honda |
| Part Type | Genuine OEM |
| Description | Plain Washer (10MM) |
Compatibility & Fitment
| Name | Models | Serial Range |
|---|---|---|
| Generator | EB3000, EB4000, EM3000, EM4000, EMS4000, EMS4500 | All |
| Lawn Tractor | HT3810, HT3813, HT4213 | All |
| Welder Generator | EW170 | 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.
