The Husqvarna 539990071 Hex Head Screw 1/4-20 x 1/2 Gr5 is a genuine OEM fastener designed for Husqvarna floor saws and tile and masonry saws, including the FS4600G, FS4800D, FS6600D, FS6800D, FS8400D, FS3500E, RS8500D, Pro65G, MS355, MS355G, MS510, and MS510G. As a factory-spec component, this screw delivers the exact thread pitch, head dimensions, and Grade 5 tensile strength that Husqvarna engineers specified for these machines. Cross-reference part number 539990071 against your parts diagram to confirm the correct application before ordering. DHS Equipment supplies this part to help keep your equipment running at full capacity.
Key Features
- Grade 5 Tensile Strength — Built to the same hardness and torque specification as the original fastener, ensuring secure clamping force across all listed applications.
- Exact Thread and Dimensional Match — 1/4-20 thread form and 1/2-inch length match the original Husqvarna specification, threading directly into existing tapped holes without rework.
- Broad Husqvarna Fleet Compatibility — Confirmed fit across FS-series floor saws and MS-series tile and masonry saws, covering a wide range of Husqvarna construction equipment.
- Genuine OEM Consistency — Sourced directly from Husqvarna, this fastener meets the same material and finish standards as the hardware installed at the factory, maintaining structural integrity at each mounting point.
- Hex Head Drive — Standard hex head design accepts common wrenches and sockets, allowing straightforward installation and removal during service or assembly.
A hex head screw like this one is used throughout Husqvarna floor saws and masonry saws to secure panels, guards, housings, and structural assemblies. The Grade 5 classification indicates a medium-strength carbon steel fastener capable of handling the vibration loads and operational stresses common to concrete cutting and masonry work. When a fastener stretches, strips, or is lost during service, replacing it with the correct OEM specification — the right thread pitch, grip length, and hardness grade — is essential to maintaining the clamping force and alignment the machine was built around. Using an undersized or incorrect-grade substitute can lead to joint loosening, component misalignment, or premature hardware failure during operation.
Part Details
| Part Number | 539990071 |
|---|---|
| Brand | Husqvarna |
| Part Type | Genuine OEM |
| Description | Hex Head Screw 1/4-20 x 1/2 Gr5 |
Compatibility & Fitment
| Name | Model |
|---|---|
| Floor Saw | FS4600G |
| Floor Saw | FS4800D |
| Floor Saw | FS6600D |
| Floor Saw | FS6800D |
| Floor Saw | FS8400D |
| Tile & Masonry Saw | MS355 |
| Tile & Masonry Saw | MS355G |
| Tile & Masonry Saw | MS510 |
| Floor Saw | Pro65G |
| Floor Saw | FS3500E |
| Floor Saw | RS8500D |
| Tile & Masonry Saw | MS510G |
| 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.
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