The Husqvarna 539990209 Hex Head Screw 5/16-18 x 1 is a genuine OEM fastener designed for a wide range of Husqvarna Construction floor saws, masonry saws, tile saws, early-entry saws, and dust and slurry equipment. As a factory-original component, this screw is manufactured to Husqvarna's exact thread pitch, head dimensions, and material grade — ensuring it seats and torques correctly without modification. Compatible models include the FS4600G, FS4800D, FS5000D, FS6600D, FS6800D, FS8400D, FS5000, RS8500D, and Pro65G floor saws, the MS355, MS355G, TS250X, and TS250XL masonry and tile saws, the SoffCut2500 and SoffCut5000 early-entry saws, and the S22B and S22H dust and slurry equipment. DHS Equipment supplies this genuine OEM part to help keep your equipment running correctly and on schedule.
Key Features
- Genuine OEM Thread Specification — Manufactured to Husqvarna's exact 5/16-18 UNC thread standard, ensuring full thread engagement and correct torque retention across every compatible machine.
- Correct Head Geometry — Hex head profile matches factory tooling requirements, so installation and removal are straightforward with standard wrenches — no reworking or adapter needed.
- Broad Cross-Family Compatibility — A single part number covers floor saws, masonry and tile saws, early-entry saws, and dust and slurry equipment, from the FS4600G and FS5000D to the SoffCut2500 and MS355.
- Structural Integrity for Demanding Applications — Engineered to the material grade Husqvarna specifies for construction equipment fasteners, maintaining clamping force under vibration and load typical of cutting and sawing operations.
- Direct OEM Replacement — Cross-reference part number 539990209 against your machine's parts diagram to confirm the correct position before installation; this screw installs exactly as the original.
A hex head screw in a construction equipment assembly does more than hold two components together — it maintains precise clamping force that keeps guards, housings, and structural panels aligned under continuous vibration and operational load. When a fastener wears, strips, or is replaced with an incorrect thread pitch or grade, joint integrity can degrade over time, leading to loosening, misalignment, or component damage. Using the correct OEM-specified screw ensures the assembly behaves exactly as Husqvarna engineered it to, maintaining safe and dependable operation across the machine's service life.
Part Details
| Part Number | 539990209 |
|---|---|
| Brand | Husqvarna |
| Part Type | Genuine OEM |
| Description | Hex Head Screw 5/16-18 x 1 |
Compatibility & Fitment
| Name | Model |
|---|---|
| Floor Saw | FS4600G |
| Floor Saw | FS4800D |
| Floor Saw | FS5000D |
| Floor Saw | FS6600D |
| Floor Saw | FS6800D |
| Floor Saw | FS8400D |
| Tile & Masonry Saw | MS355 |
| Tile & Masonry Saw | MS355G |
| Tile & Masonry Saw | TS250X |
| Tile & Masonry Saw | TS250XL |
| Floor Saw | FS5000 |
| Floor Saw | Pro65G |
| Early Entry Saw | SoffCut2500 |
| Early Entry Saw | SoffCut5000 |
| Dust & Slurry Equipment | S22B |
| Dust & Slurry Equipment | S22H |
| Floor Saw | PRO65G |
| Floor Saw | RS8500D |
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.
Husqvarna