Wacker Neuson 5100011917 Serrated Lock Washer

The Wacker Neuson Serrated Lock Washer is a genuine OEM component designed for the RD-series tandem rollers and RC-series single drum soil compactors. Sourced directly from Wacker Neuson, this is the exact part used in original production — same serration profile, same material grade, same dimensions. It fits a broad range of models including the RD18-80, RD24-100, RD27-120, RD40-130, RD45-140, RC50, RC70, and RC110 series, covering standard, C, O, DPF, and electric variants sold in both domestic and US markets. When you order part number, you get a direct drop-in replacement with no guesswork on fitment.

Key Features

• Genuine OEM Serration Integrity — Manufactured to Wacker Neuson's original serration geometry, ensuring the locking teeth bite and hold under the vibration loads typical of compaction equipment.
• Direct Drop-In Replacement — Matches the original bore diameter, outer diameter, and tooth pattern, so it seats correctly against mating fastener surfaces without any rework.
• Broad Model Coverage — Compatible with RD18, RD24/RD28, RD27, RD40, RD45 tandem rollers and RC50, RC70, RC110 single drum soil compactors, including DPF, C, O, and electric variants.
• Vibration-Resistant Locking — The serrated profile bites into the fastener and bearing surface to prevent loosening during continuous compaction cycles, maintaining joint clamp load throughout the work shift.
• Wide Generation Compatibility — Covers multiple production generations and regional variants (US, SE, ROPS, CAB, DPF, VO), making it a practical stock item for fleet operators running mixed RD and RC equipment.

A serrated lock washer is a hardened washer with sharp, angled teeth machined into one or both faces. When a fastener is torqued down, those teeth embed into the mating surfaces and create mechanical resistance against rotational loosening. On compaction equipment like the Wacker Neuson RD and RC series, the constant vibration generated during drum operation places sustained stress on every bolted joint — a washer that loses its locking ability can allow fasteners to back off gradually, leading to misalignment, component wear, or structural joint failure. Replacing a worn or damaged serrated lock washer with a genuine OEM part like the 5100011917 restores the correct clamping integrity to the joint and keeps critical assemblies secured under load.

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.