The Husqvarna 539990258 Nut 1/2-13 Hex Z/P is a genuine OEM fastener designed for Husqvarna FS series floor saws, including the FS413, FS4800D, FS5000D, FS5000, FS513, FS520, FS524, FS6600D, FS6800D, FS7000D, FS7000DL, FS8400D, and Pro65G. As a direct OEM replacement, this nut meets Husqvarna's exact specifications for thread pitch, hex dimensions, and zinc-plated corrosion protection. Cross-reference part number 539990258 against your parts diagram to confirm the correct position before ordering. DHS Equipment supplies this part to help keep your floor saw operating at full capacity.
Key Features
- OEM-Spec Threading — Manufactured to Husqvarna's exact 1/2-13 UNC thread specification, ensuring proper torque transfer and secure clamping without thread mismatch or stripping.
- Zinc-Plated Finish — The Z/P coating provides corrosion resistance suited to the wet-cutting and slurry-heavy environments common on floor saw applications.
- Direct Replacement Fit — This nut installs directly in the same position as the original, with no modification to hardware or mating components required.
- Broad FS Series Compatibility — Fits a wide range of Husqvarna walk-behind floor saws, including the FS5000D, FS7000D, FS8400D, FS513, FS524, and Pro65G models.
- Structural Integrity Restored — A correctly torqued, properly spec'd nut maintains the structural assembly of the floor saw, preventing loosening under the vibration and load typical of slab cutting.
A hex nut in a floor saw assembly serves as a critical fastener that secures structural and mechanical components under significant operational load. Floor saws generate sustained vibration and cutting forces during concrete and asphalt slab work, which places constant stress on every fastener in the frame, blade guard, and drivetrain assemblies. A worn, damaged, or incorrect-spec nut can lead to loosening of critical components, compromising both cut precision and operator safety — making an exact OEM replacement the correct choice when hardware needs to be renewed.
Part Details
| Part Number | 539990258 |
|---|---|
| Brand | Husqvarna |
| Part Type | Genuine OEM |
| Description | Nut 1/2-13 Hex Z/P |
Compatibility & Fitment
| Name | Model |
|---|---|
| Floor Saw | FS413 |
| Floor Saw | FS4800D |
| Floor Saw | FS5000D |
| Floor Saw | FS513 |
| Floor Saw | FS520 |
| Floor Saw | FS524 |
| Floor Saw | FS6600D |
| Floor Saw | FS6800D |
| Floor Saw | FS7000D |
| Floor Saw | FS7000DL |
| Floor Saw | FS8400D |
| Floor Saw | Pro65G |
| Floor Saw | FS5000 |
| 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.
