Multiquip 21231 Plate Stud Isolators 5/16

The Multiquip 21231 Plate Stud Isolators 5/16 is a genuine OEM component designed for STX55, HTX44, HTXG6DF, HTXD6i, STXD6i, HHXD5, WRSPUDF, WRS5200, and WRS5200DFPU series equipment. As a direct OEM replacement, part 21231 is manufactured to the same specification as the original, ensuring a correct installation with no adaptation needed. This part is verified for compatibility across Whiteman ride-on power trowels and ride-on roller screeds in the Multiquip product lineup.

Key Features

• Genuine OEM Vibration Isolation — Manufactured to original specification, delivering the correct durometer and compression rating needed to properly dampen vibration at the plate-to-stud mounting point.
• Direct Mounting Replacement — Sized specifically for the 5/16 stud interface, allowing straightforward installation without reworking the mounting hardware.
• Broad Fitment Coverage — Compatible with STX55, HTX44, HTXG6DF, HTXD6i, STXD6i, HHXD5, WRSPUDF, WRS5200, and WRS5200DFPU models.
• Operator Comfort and Control — Properly functioning isolators absorb machine vibration at the structural interface, maintaining stable handling and reducing operator fatigue during extended finishing or screeding runs.
• Structural Integrity Protection — Worn or degraded isolators allow metal-to-metal contact at the mounting point, accelerating wear on surrounding hardware and affecting machine balance over time.

Plate stud isolators are rubber or elastomeric mounts positioned between the plate and the stud connection point on the machine frame. Their job is to absorb and dampen the vibration generated during operation, preventing that energy from transmitting directly into the machine structure or operator controls. When isolators degrade — cracking, compressing permanently, or breaking apart — vibration transfers unchecked through the frame, which can accelerate wear on fasteners and adjacent components and negatively affect the smoothness and precision of the trowel or screed pass.

For assistance confirming fitment or placing your order, contact the DHS Equipment team directly.

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.