Multiquip 0166 Lock Washer 3.8

The Multiquip 0166 Lock Washer 3.8 is a genuine OEM fastener component designed for a wide range of Multiquip, Whiteman, and Essick equipment including mixers, power buggies, ride-on and walk-behind trowels, rollers, concrete pumps, and saws. As an authentic OEM part, the 0166 is manufactured to the exact material grade and dimensional tolerances required for correct clamping force and vibration resistance across the equipment families it serves. This lock washer fits models including WM45H, WM45HE, WBH-16, WBH-21EF, AR13H, AR14H, STX6H, HTX6H, LS300, LS600, and many additional Multiquip-portfolio machines. Sourcing the correct OEM fastener ensures the joint it secures performs as intended under operational loads and vibration.

Key Features

• Genuine OEM Material Grade — Manufactured to the exact hardness and spring tension specification required to maintain clamp load under the vibration loads common to compaction, mixing, and finishing equipment.
• Drop-In Installation — Matches the original bore diameter and outside profile, seating correctly against mating fastener and surface without rework or shimming.
• Broad Cross-Equipment Fitment — Confirmed fitment across Whiteman mixers (WM45, WM63, WM90, WM120), power buggies (WBH-16, WBH-21), ride-on trowels (STX6H, HTX6H, HTX44), rollers (AR13, AR14, V304, V305), Essick mixers, concrete pumps (LS300, LS400, LS500, LS600), and additional models.
• Vibration-Resistant Locking Action — The hardened split design bites into mating surfaces to resist loosening under sustained mechanical vibration, preventing joint creep that can lead to structural misalignment or component loss.
• Single-Source OEM Traceability — Supplied under Multiquip part number 0166, ensuring the correct washer is documented in your service records and matches the parts diagram for your specific machine.

A lock washer is a hardened split ring fastener placed beneath a bolt or nut to prevent the fastener from loosening under vibration, dynamic loading, or thermal cycling. As equipment operates, the mechanical energy transmitted through the frame and components creates micro-movement at fastened joints; without a correctly rated lock washer, bolts can back out gradually, leading to loose assemblies, accelerated wear on mating parts, or sudden component separation. Using the correct OEM-specified washer ensures the designed clamping load is maintained throughout the service interval, keeping critical joints secure across the full range of operating conditions the machine is built to handle.

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.