The Multiquip EM406 Heavy Hex Nut is a genuine OEM fastener designed for Whiteman and International ride-on power trowel models including the STX55, HTX44, HTXD6i, STXD6i, HHXDF4, HHXD5, and HHXG5 series. As a direct OEM replacement, EM406 meets Multiquip's original material and dimensional standards, ensuring a secure fit within the machine's structural and mechanical fastening points. DHS Equipment sources this part directly through authorized Multiquip channels, so you can order with confidence knowing you're receiving an authentic component. Confirm your model code against the fitment list before ordering to make sure EM406 is the correct specification for your machine.
Key Features
- Genuine OEM Grade Steel: — Heavy hex profile delivers greater bearing surface and torque capacity than standard hex fasteners, critical for high-load trowel frame connections.
- Direct OEM Replacement: — Matches the original 1/2-13 thread specification, dropping into existing fastener positions without reworking threads or mounting hardware.
- Broad Ride-On Trowel Fitment: — Compatible with STX55, HTX44, HTXD6i, STXD6i, HHXDF4, HHXD5, HHXG5, EHHNK5, and JWN24HTCSL/HSCSL series trowels.
- Structural Integrity Under Vibration: — The heavy hex geometry resists loosening under the sustained vibration loads generated during finishing operations, maintaining clamp force over extended use.
- Safety-Critical Fastener: — A failed or incorrectly specified fastener in a ride-on trowel's frame or blade assembly can compromise operator safety; using the correct OEM-specified nut is essential.
A heavy hex nut is a thick-walled, large-bearing-surface fastener used where higher clamping force or resistance to vibration loosening is required compared to a standard hex nut. On ride-on power trowels, fasteners like the EM406 secure frame members, guard assemblies, and mechanical components that are subjected to continuous rotational and vibration loads during concrete finishing work. A worn, stripped, or incorrect-specification nut can allow critical joints to work loose, leading to misalignment, component damage, or an unsafe operating condition on the machine.
Part Details
| Part Number | EM406 |
|---|---|
| Brand | Multiquip |
| Part Type | Genuine OEM |
| Description | Heavy Hex Nut |
Compatibility & Fitment
| Name | Model |
|---|---|
| Whiteman Ride-On Power Trowels | STX55Y6 |
| Whiteman Ride-On Power Trowels | STX55J6 |
| Whiteman Ride-On Power Trowels | HHXDF4-DF5 |
| Whiteman Ride-On Power Trowels | HTX44Y5 |
| Whiteman Ride-On Power Trowels | HTX44Y4 |
| Whiteman Ride-On Power Trowels | HTX44K5 |
| Whiteman Ride-On Power Trowels | HTX44K4 |
| Whiteman Ride-On Power Trowels | HTXD6i |
| Whiteman Ride-On Power Trowels | STXD6i |
| International Ride-On Power Trowels | EHHNK5 |
| Whiteman Ride-On Power Trowels | JWN24HTCSL/HSCSL |
| Whiteman Ride-On Power Trowels | HHXD5-ES |
| Whiteman Ride-On Power Trowels | HHXG5 |
| Whiteman Ride-On Power Trowels | HHXD5 |
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.
