Multiquip 0161 Lock Washer 3/8

The Multiquip 0161 is a genuine OEM Lock Washer 3/8 designed for a broad range of Multiquip, Whiteman, and Essick equipment including ride-on power trowels, walk-behind trowels, concrete mixers, pumps, saws, screeds, generators, and water trailers. As a direct OEM replacement, part 0161 is manufactured to the same specification as the original hardware installed at the factory, ensuring consistent fit across every compatible application. This washer is confirmed for use on models including HTX44, STX55, JWN24, EM120SM, QP3TZ, and many additional units across the Multiquip product family.

Key Features

• Genuine OEM Hardware Grade — Manufactured to the same material hardness and dimensional tolerancing as the original fastener hardware, maintaining proper clamping load under vibration.
• Direct-Fit 3/8 Sizing — Sized to seat correctly on 3/8 fastener assemblies with no filing, shimming, or rework required on installation.
• Broad Equipment Compatibility — Verified for ride-on trowels (HTX44, STX55, JWN24, HHN31V), walk-behind trowels (CA4HM, HDA Series), mixers (EM120SM, EM900SD), pumps (QP3TZ, QP3TS, QP4TKT), saws (SP118, SP1G), screeds (WSHE-A Series), generators (DAC7000SS), and more.
• Vibration Resistance — The helical split design bites into mating surfaces to resist loosening caused by operational vibration — critical on high-cycle equipment like trowels, pumps, and screeds.
• Fastener Integrity Under Load — A failed or missing lock washer allows fasteners to back out during operation, leading to misalignment, component damage, or unsafe conditions. Replacing with the correct OEM washer restores the fastener stack to its designed specification.

A lock washer is a hardened, split-ring fastener component placed beneath a bolt or nut to prevent loosening caused by vibration, dynamic loads, or thermal cycling. As the fastener is tightened, the washer's split ends bite into both the fastener face and the mating surface, creating a mechanical resistance to rotation. On equipment such as power trowels, pumps, and concrete mixers — where continuous vibration is a constant operating condition — maintaining proper fastener torque retention is essential. When a lock washer is missing, deformed, or worn flat, fasteners can gradually back out, leading to loose assemblies, accelerated wear on surrounding components, and potential operational or safety failures.

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.