Wacker Neuson 5100011918 Serrated Lock Washer

The Wacker Neuson Serrated Lock Washer is a genuine OEM component designed for the RD18, RD24, RD27, RD28, RD40, RD45 tandem roller series and the RC50, RC70, and RC110 single drum soil compactor series. Sourced directly from Wacker Neuson, part meets the exact material and dimensional standards of the original — so it installs and performs exactly as intended. This serrated lock washer covers an extensive range of compactor configurations including CAB, ROPS, DPF, open drum, pad foot, and vibratory offset variants across both US and international models.

Key Features

• Genuine OEM Serration Integrity — Manufactured to Wacker Neuson's original tooth-profile specification, ensuring the serrations bite and hold under the vibration loads typical of compaction equipment.
• Direct Drop-In Installation — Matches the original bore diameter, outer diameter, and thickness of the factory washer, so no rework or shimming is needed at the fastener seat.
• Broad Compactor Compatibility — Confirmed fit across RD18, RD24, RD27, RD28, RD40, and RD45 tandem rollers, plus RC50, RC70, and RC110 single drum soil compactors in multiple configurations.
• Vibration-Resistant Locking — The serrated edge bites into the mating surface to resist fastener back-off caused by continuous drum vibration, helping critical assemblies stay torqued to spec between service intervals.
• Wide Configuration Coverage — Suits open drum, pad foot, vibratory offset, DPF, CAB, and ROPS variants across both US and international model lines under a single part number.

A serrated lock washer is placed beneath a fastener head or nut to prevent the fastener from loosening under vibration or dynamic loading. The serrations — small, angled teeth machined into the washer face — dig into both the mating surface and the fastener, creating mechanical resistance to rotation. On compaction equipment like tandem rollers and soil compactors, constant drum vibration puts fastener joints under sustained cyclic stress, making a correctly specified lock washer essential for maintaining clamp load. A worn, missing, or incorrect washer allows fasteners to back off gradually, which can lead to loose assemblies, accelerated wear at the joint, and potential structural or mechanical failure if left unaddressed.

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.

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