The Honda 90331-SD5-003 Spring Nut (5MM) is a genuine OEM fastener designed for HS521 and HS621 single-stage snow blowers. Sourced directly from Honda, this component matches the original specification for an exact, hassle-free installation. Honda supersedes parts at serial-number breaks, so confirm your snow blower's serial number against the fitment table before ordering to ensure you have the correct version for your unit.
Key Features
- Genuine Honda OEM — manufactured to the same specification as the original hardware, ensuring consistent retention and clamping force on your snow blower.
- 5MM Spring Nut Design — the spring-tension construction locks the fastener in place under vibration, maintaining secure assembly during operation.
- Direct Fitment — listed for HS521 and HS621 single-stage snow blowers; verify your serial number against the fitment table to confirm the correct part for your machine.
A spring nut uses an internal spring or locking feature to grip a threaded stud or bolt and resist loosening under vibration and dynamic loads. On single-stage snow blowers like the HS521 and HS621 — where the auger paddle generates continuous vibration during use — fasteners that lose their grip can allow components to work loose over time. Replacing a worn or damaged spring nut with the correct genuine OEM part restores the secure, rattle-free assembly Honda designed into these machines.
Part Details
| Part Number | 90331-SD5-003 |
|---|---|
| Brand | Honda |
| Part Type | Genuine OEM |
| Description | Spring Nut (5MM) |
Compatibility & Fitment
| Name | Models | Serial Range |
|---|---|---|
| Single-Stage Snow Blower | HS521, HS621 | 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.
