Husqvarna 539300306 Socket Head Set Screw

The Husqvarna 539300306 Socket Head Set Screw is a genuine OEM fastener designed for the FS4800D, FS8400D, and RS8500D floor saws. As a direct OEM replacement, this screw is manufactured to Husqvarna's exact specifications, ensuring the correct thread pitch, drive geometry, and material grade for a secure, lasting installation. This Socket Head Set Screw is the right solution when your floor saw requires a fastener replacement to restore proper assembly integrity across the FS4800D, FS8400D, and RS8500D platforms. DHS Equipment supplies this part to help keep your equipment running at full capability.

Key Features

• Genuine OEM Specification — Manufactured to Husqvarna's exact thread profile, hardness grade, and drive dimensions — critical for a fastener that must hold components firmly under the vibration loads generated by walk-behind floor saws.
• Direct Assembly Fit — This Socket Head Set Screw installs directly into the intended socket on the FS4800D, FS8400D, and RS8500D without alteration, matching the original fastener position and torque specification.
• Confirmed Floor Saw Fitment — Verified for the FS4800D, FS8400D, and RS8500D floor saws. Cross-reference 539300306 against your machine's parts diagram to confirm the exact assembly location.
• Structural Holding Power — A correctly installed set screw locks mating components in precise alignment; a worn, stripped, or missing one can allow unwanted movement that leads to misalignment and accelerated component wear.
• Operator Safety Compliance — Maintaining all fasteners to OEM specification on cutting equipment helps preserve the structural integrity of the assembly and supports safe operation under working loads.

A socket head set screw is a headless fastener that seats flush within a threaded bore, using internal hex drive engagement to apply clamping or locking force between two components — such as securing a collar, gear, or bracket against a shaft or housing. On a walk-behind floor saw like the FS4800D, FS8400D, or RS8500D, set screws play a key role in keeping assemblies locked in position through the sustained vibration and load cycles of concrete cutting. When a set screw strips, loosens, or breaks, the affected assembly can shift or develop play, compromising both cut quality and equipment integrity.

Part Details

Compatibility & Fitment

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.