Multiquip 00400 Lock Washer

The Multiquip 00400 is a genuine OEM Lock Washer designed for a wide range of Multiquip welders, gasoline and diesel generators, and walk-behind rollers. As a direct OEM replacement, this Lock Washer meets the original design specification and installs exactly as the factory component did. Compatible equipment includes DLW and DAW series diesel light welders, GAW and GAC series gasoline arc welders, GA series gasoline generators, DAC series diesel generators, and RW and P33 series rollers — including models DLW400ESA4, DAW500SA4, DLW330X2, DLW400ES, DLW400ESA, DLW400ESA1. Sourcing the correct part number, 00400, it ensures the washer seats and torques properly without guesswork.

Key Features

• Genuine OEM Construction — Manufactured to Multiquip's original hardness and dimensional spec, so the locking teeth bite and hold under the vibration loads these machines generate.
• Broad Cross-Family Fitment — A single part number covers DLW, DAW, and DLW300/400/500 diesel welders; GAW and GAC gasoline arc welders; GA series gasoline generators; DAC7000SS diesel generators; and RW and P33/24 walk-behind rollers.
• Drop-In Replacement — Matches the original bore, outer diameter, and tooth profile, so it seats onto the existing fastener stack without modification.
• Fastener Joint Integrity — A correctly functioning lock washer prevents bolt backout caused by vibration, keeping critical assemblies clamped to the rated torque spec throughout the service interval.
• Electrical and Structural Safety Relevance — On welders and generators, loose fasteners in electrical connections can cause arcing or intermittent output; this washer helps maintain secure, stable connections throughout operation.

A lock washer is a small but essential hardware component placed beneath a nut or bolt head to resist loosening caused by vibration, thermal cycling, or dynamic loads. The washer's split or toothed profile creates spring tension that keeps constant pressure on the fastener joint, preventing the nut or bolt from backing out during operation. When a lock washer becomes flattened, corroded, or missing entirely, fasteners in high-vibration assemblies — such as engine mounts, electrical terminals, and structural panels — can work loose over time, leading to component movement, electrical faults, or mechanical failure. Replacing a worn or damaged lock washer with the correct OEM part, Multiquip 00400, restores joint security and protects the surrounding components from the consequences of an unsecured connection.

For questions about fitment or to confirm this is the right part for your specific serial number, contact the DHS Equipment parts team for assistance.

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.