The Multiquip EM612 Lock Washer 3/8" is a genuine OEM fastener component designed for STX55 and HTX44 series Whiteman ride-on power trowels. As a direct OEM replacement, EM612 is manufactured to the same specifications as the original hardware installed at the factory, ensuring a drop-in fit with no guesswork. Confirmed fitment includes the STX55J6, STX55Y6, STXD6i, HTX44K4, HTX44K5, HTX44Y4, and HTX44Y5. Sourcing the correct lock washer by EM612 is the simplest way to keep your trowel assembly properly torqued and secured.
Key Features
- Genuine OEM Hardware Grade — Manufactured to the original material and dimensional specification for a 3/8" lock washer, delivering consistent spring tension and bite under torque.
- Direct-Fit Replacement — Sized and formed to seat correctly in the existing fastener stack on STX55 and HTX44 series trowels without rework or shimming.
- Broad STX55 and HTX44 Coverage — Fits STX55J6, STX55Y6, STXD6i, HTX44K4, HTX44K5, HTX44Y4, and HTX44Y5 Whiteman hydrostatic ride-on trowels.
- Prevents Fastener Loosening — A functioning lock washer maintains clamping load through vibration and repeated operational cycles, keeping critical assemblies from backing off during use.
- Verified by Part Number — Ordering by OEM part number EM612 confirms you receive the correct size, material, and configuration for your machine.
A lock washer is a hardened ring placed under a bolt or nut to resist loosening caused by vibration and dynamic loading. On a ride-on power trowel, where rotating blade assemblies and engine vibration place continuous stress on fastened joints, maintaining proper clamping force is essential to keeping components secure during operation. When a lock washer is missing, worn flat, or substituted with an incorrect size, fasteners can back off gradually, leading to play in assemblies, accelerated wear on mating surfaces, or unexpected disassembly of critical components.
Part Details
| Part Number | EM612 |
|---|---|
| Brand | Multiquip |
| Part Type | Genuine OEM |
| Description | Lock Washer 3/8" |
Compatibility & Fitment
| Name | Model |
|---|---|
| Whiteman Ride-On Power Trowels | STX55J6 |
| Whiteman Ride-On Power Trowels | STX55Y6 |
| Whiteman Ride-On Power Trowels | STXD6i |
| Whiteman Ride-On Power Trowels | HTX44K4 |
| Whiteman Ride-On Power Trowels | HTX44Y5 |
| Whiteman Ride-On Power Trowels | HTX44Y4 |
| Whiteman Ride-On Power Trowels | HTX44K5 |
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.
