Wacker Neuson 5000115642 M5 External Lock Washer

The Wacker Neuson M5 External Lock Washer is a genuine OEM fastening component designed for the G25, G50, G85, G110, G125, and G155 skid-mounted and trailer-mounted mobile generator series, including MGT1, MGT1S, MGT1E, MGT2S, and MGT2E configurations. Sourced directly from Wacker Neuson, this lock washer meets the original engineering specifications for secure fastener retention across all covered generator variants. Whether you are servicing a cold-weather G50 unit or performing scheduled maintenance on an MGT trailer generator, part number ensures you are installing the correct hardware. Having the right fastener on hand keeps critical assemblies properly torqued and prevents loosening under vibration.

Key Features

• Genuine OEM Hardness and Temper — Manufactured to the original material specification for consistent spring tension and bite, ensuring the washer grips and holds under load.
• M5 External-Tooth Profile — The external serrated edge bites into the mating surface on installation, resisting rotational loosening caused by generator vibration during operation.
• Broad Generator Family Coverage — Fits the G25, G50, G85, G110, G125, and G155 skid-mounted generators, plus the full MGT1 and MGT2 trailer-mounted generator range.
• Prevents Fastener Back-Out — A failed or missing lock washer allows bolts and screws to back out over time, leading to loose panels, covers, or electrical connections on the generator set.
• Electrical Safety Application — Used in generator assemblies where a backed-out fastener can compromise grounding connections or enclosure integrity, making correct hardware selection important for safe operation.

An external lock washer is a hardened, serrated fastening component placed under a bolt head or nut to prevent self-loosening. The external teeth dig into both the fastener and the mating surface, creating mechanical resistance against rotation — particularly important on equipment like generators that run under sustained vibration. When a lock washer is missing, deformed, or the wrong size, fasteners can work loose progressively, compromising structural connections, ground paths, and panel security. Replacing a worn or lost lock washer with the correct OEM part restores the clamping integrity the original assembly was designed to maintain.

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.