Multiquip 0181 Lock Washer 1/4" Medium

The Multiquip 0181 Lock Washer 1/4" Medium is a genuine OEM fastener component designed for a wide range of Multiquip and Whiteman equipment, including ride-on and walk-behind power trowels, roller screeds, trash and centrifugal pumps, masonry saws, concrete vibrators, and Essick mixers. As a direct OEM replacement, part 0181 meets the original engineering specification for thread engagement and locking force across every application it serves. Compatible models include the JWN24, STX6H, STX55Y6, STX55J6, HTX6H, HTX44Y4, HTX44Y5, HTX44K4, HTX44K5, HTXD6i, STXD6i, HHN31V, HHN34TVD, WRS5200, CA4HM, BPX, QP2TH, QP3TH, QP3TK, MP1H, EM120SM, and many additional models across the Multiquip product line. Sourced directly through DHS Equipment, this part carries the confidence of genuine OEM supply for a critical fastener used throughout the machine.

Key Features

• Genuine OEM Locking Force — Manufactured to the original torque-retention specification, ensuring the washer bites and holds under operational vibration without backing off.
• Drop-In 1/4" Fitment — Sized to seat flush on standard 1/4" fastener stacks; installs without shimming, grinding, or modification to the mating hardware.
• Broad Cross-Equipment Compatibility — A single part number covering trowels (JWN24, STX, HTX, HHN series), screeds (WRS5200), pumps (QP2TH, QP3TK, QP3TZ), saws (MP series), vibrators (BPX), and mixers (EM120SM, EM900SD).
• Vibration Resistance — The medium-duty profile resists loosening caused by the continuous vibration inherent to compaction, troweling, and pump operation — keeping fastened assemblies secure through full work cycles.
• Fastener System Integrity — A failed or missing lock washer allows bolted joints to work loose over time, risking misalignment or separation of critical assemblies; replacing worn washers restores the full clamp load of the fastener joint.

A lock washer is a thin, hardened ring placed under a bolt or nut to prevent the fastener from loosening due to vibration, torque, or thermal cycling. The washer's split or toothed profile bites into both the fastener and the mating surface, creating mechanical resistance that holds the clamp load in place during operation. When a lock washer becomes flattened, corroded, or is missing entirely, the fastener is free to back out gradually — which can lead to loose guards, misaligned components, or structural joint failure in high-vibration equipment. Replacing a worn washer with a correctly rated OEM component like the Multiquip 0181 restores the designed holding force and keeps bolted assemblies secure across the full service life of the machine.

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.