The Honda 90103-YB9-003 Bolt-Washer (10X40) is a genuine OEM fastener designed for Honda WT20, WT30, and WT40 water pumps. As a factory-original component, this bolt-washer is built to Honda's exact specifications, ensuring a correct, rattle-free fit every time. This part is listed for the WT20, WT30, and WT40 — confirm your pump's serial number against the fitment table to select the right listing for your unit. Ordering by part number 90103-YB9-003 guarantees you receive the correct Honda OEM piece rather than a generic substitute.
Key Features
- Genuine OEM Fastener — sourced directly from Honda, this bolt-washer meets the same specifications used on the original assembly, so clamping load is consistent and correct
- Integrated Washer Design — the captive washer distributes clamping force evenly, reducing the chance of surface damage or loosening under pump vibration and load
- Fits WT-Series Water Pumps — listed for Honda WT20, WT30, and WT40 water pumps; check your unit's serial number against the fitment table before ordering, as Honda supersedes hardware at serial breaks
- Direct OEM Replacement — replaces the original bolt-washer with no alterations, keeping your pump's assembly integrity intact during routine service or repair
A bolt-washer is a fastener that combines a threaded bolt and a captive washer in a single piece, eliminating the need to handle a separate washer during assembly. On Honda water pumps such as the WT20, WT30, and WT40, this type of fastener is used where consistent clamping and vibration resistance are important to keeping pump components properly secured during operation. When a bolt-washer is lost, damaged, or stripped, the joint it secures can work loose under the continuous vibration a running pump produces, leading to leaks, misalignment, or accelerated wear on surrounding components.
Part Details
| Part Number | 90103-YB9-003 |
|---|---|
| Brand | Honda |
| Part Type | Genuine OEM |
| Description | Bolt-Washer (10X40) |
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.
