The Husqvarna 504750601 Lock Nut is a genuine OEM fastener designed for the PG680, PG820, PG680RC, and PG820RC floor grinders. As a factory-sourced component, this lock nut is manufactured to Husqvarna's exact specifications, ensuring the correct thread engagement, torque retention, and dimensional fit for the application. Verify part number 504750601 against your machine's parts diagram to confirm the correct position before ordering. DHS Equipment supplies this part to help keep your equipment running at full performance.
Key Features
- Genuine OEM Thread Specification — Manufactured to Husqvarna's exact thread pitch and hardness rating, ensuring the holding force this fastener is designed to deliver is never compromised.
- Secure Locking Retention — The locking feature resists loosening under the sustained vibration typical of planetary floor grinder operation, maintaining critical assembly integrity over time.
- Direct Replacement Fit — Installs into the same position as the original, with no machining or adaptation required to seat correctly in the assembly.
- Broad PG Series Compatibility — Fits the PG680, PG680RC, PG820, and PG820RC planetary floor grinders, covering both standard and remote-controlled variants in these two machine families.
- Restored Assembly Integrity — A worn or failed lock nut can allow critical components to shift or work loose during operation; replacing it promptly restores the mechanical stability the assembly depends on.
A lock nut is a fastener engineered to resist self-loosening under vibration and dynamic loads — conditions that a standard nut cannot reliably withstand over time. On a planetary floor grinder like the PG680 and PG820 series, rotating assemblies and grinding heads generate continuous vibration that gradually works conventional fasteners loose. When a lock nut fails or wears, the components it secures can shift, creating misalignment, accelerated wear, or unsafe operating conditions. Replacing it with a genuine OEM part ensures the correct locking action and clamping load are restored to the assembly.
Part Details
| Part Number | 504750601 |
|---|---|
| Brand | Husqvarna |
| Part Type | Genuine OEM |
| Description | Lock Nut |
Compatibility & Fitment
| Name | Model |
|---|---|
| Floor Grinder | PG680 |
| Floor Grinder | PG820 |
| Floor Grinder | PG820RC |
| Floor Grinder | PG680RC |
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.
