The Honda 90031-RNA-A01 Bolt-Washer (10X30) is a genuine OEM fastener designed for Honda BF75, BF90, and BF100 outboard motors. As a direct Honda replacement, this part is manufactured to the exact specifications required for proper assembly and torque retention on your outboard. Confirm your motor's serial number against the fitment table to ensure part number 90031-RNA-A01 is the correct application for your unit.
Key Features
- Genuine OEM Fastener — sourced directly from Honda, this bolt-washer meets the precise dimensional and torque specifications Honda engineers set for BF-series outboard assembly.
- Integrated Washer Design — the captive washer flange distributes clamping load evenly across the mating surface, maintaining consistent joint integrity without a separate washer.
- Outboard-Specific Fitment — listed for BF75, BF90, and BF100 outboard motors; verify your serial number against the compatibility table before ordering.
- Direct OEM Replacement — replaces the original bolt-washer with no fitting adjustments needed, keeping your outboard assembly to Honda's original specification.
A bolt-washer is a fastener that combines a bolt and an integrated washer flange into a single component. The washer portion spreads the clamping force over a wider area than a standard bolt head alone, helping to prevent the fastener from pulling through or deforming the mating surface during tightening. When a bolt-washer stretches, corrodes, or is overtorqued, it can fail to maintain the clamping load needed to keep critical outboard assemblies properly secured, potentially leading to loosening under the vibration and load conditions a marine engine experiences in service.
Part Details
| Part Number | 90031-RNA-A01 |
|---|---|
| Brand | Honda |
| Part Type | Genuine OEM |
| Description | Bolt-Washer (10X30) |
Compatibility & Fitment
| Name | Models | Serial Range |
|---|---|---|
| Outboard Motor | BF75, BF90 | All |
| Portable Outboard Motor | BF100 | 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.
