The Husqvarna 539990254 Lock Washer 1/2 is a genuine OEM fastener component designed for Husqvarna PP-series power packs and FS-series floor saws, including the PP2525DS, PP3030, PP2525DTR, FS4600G, FS4800D, FS6600D, FS6800D, FS8400D, FS3500E, RS8500D, and Pro65G. As a direct OEM replacement, this lock washer delivers the exact dimensional profile and material grade specified by Husqvarna for these machines. Cross-reference part number 539990254 against your parts diagram to confirm the correct position before ordering. DHS Equipment supplies this part to help keep your equipment running at full capacity.
Key Features
- Genuine OEM Hardened Construction — Manufactured to Husqvarna's original material and temper specifications, ensuring the washer maintains correct clamping force and bite under operational vibration and load cycling.
- Direct Bolt-In Replacement — Sized to 1/2 inch to match the original fastener position exactly, dropping in without rework to the mating hardware or surrounding assembly.
- Broad Fitment Across Two Equipment Families — Compatible with PP-series power packs (PP2525DS, PP2525DTR, PP3030) and FS-series floor saws (FS4600G, FS4800D, FS6600D, FS6800D, FS8400D, FS3500E, RS8500D, Pro65G), making it a versatile service part across your fleet.
- Fastener Integrity Where It Counts — A properly functioning lock washer prevents fastener back-off caused by machine vibration, keeping critical assemblies tight and maintaining structural integrity during demanding cutting or power-delivery operations.
- Verified OEM Part Number — Ordering by part number this part ensures you receive the exact Husqvarna-specified component, eliminating guesswork when sourcing hardware during a service or repair.
A lock washer is a hardened fastener insert placed beneath a nut or bolt head to resist loosening caused by vibration and dynamic load. In high-vibration equipment like floor saws and hydraulic power packs, fasteners that are not properly secured can work loose over time, leading to misaligned components, oil leaks at fittings, or structural failure of a bolted joint. Replacing a worn or damaged lock washer with the correct OEM-specified part restores proper clamping tension and helps the surrounding assembly perform as designed.
Part Details
| Part Number | 539990254 |
|---|---|
| Brand | Husqvarna |
| Part Type | Genuine OEM |
| Description | Lock Washer 1/2 |
Compatibility & Fitment
| Name | Model |
|---|---|
| Power Pack | PP2525DS |
| Power Pack | PP3030 |
| Floor Saw | FS4600G |
| Floor Saw | FS4800D |
| Floor Saw | FS6600D |
| Floor Saw | FS6800D |
| Floor Saw | FS8400D |
| Floor Saw | FS3500E |
| Floor Saw | RS8500D |
| Floor Saw | Pro65G |
| Power Pack | PP2525DTR |
| Floor Saw | PRO65G |
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.
