The Honda 90301-YB8-003 Nut-Washer (8MM) is a genuine OEM Nut-Washer (8MM) designed for Honda WT20, WT30, and WT40 water pumps. As a direct Honda OEM component, this part is manufactured to the same specifications as the hardware installed at the factory, ensuring a correct fit within the pump assembly. Honda supersedes hardware at serial-number breaks, so confirm your pump's serial number against the fitment table before ordering. This nut-washer is a straightforward service item that keeps your water pump properly fastened during operation.
Key Features
- Genuine Honda OEM Hardware — sourced directly from Honda, this nut-washer matches the original specification for the WT20, WT30, and WT40 water pumps, with no guesswork on thread pitch or washer profile
- Broad Pump Compatibility — listed for Honda WT20, WT30, and WT40 water pumps, including both trash and general-purpose centrifugal models; verify your serial number against the fitment table to confirm the correct application
- Proper Clamping Integrity — a correctly sized and torqued nut-washer maintains consistent clamping load at its fastening point; a stripped, corroded, or missing fastener can allow components to work loose under the vibration loads a water pump generates during continuous use
A nut-washer is a combined fastener that integrates a hex nut and a captive washer into a single piece. The washer face distributes clamping load across a broader area than a plain nut, reducing the risk of surface damage and helping the fastener stay secure under vibration. On water pumps such as the WT20, WT30, and WT40, which run at sustained engine speeds for extended periods, maintaining proper fastener torque and seating is essential to keeping the pump's components securely assembled. When a nut-washer becomes damaged or corrodes beyond serviceability, replacing it with the correct OEM part restores proper clamping and helps prevent loosening during operation.
Part Details
| Part Number | 90301-YB8-003 |
|---|---|
| Brand | Honda |
| Part Type | Genuine OEM |
| Description | Nut-Washer (8MM) |
Compatibility & Fitment
| Name | Models | Serial Range |
|---|---|---|
| Water Pump | WT20, WT30, WT40 | 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.
