Wacker Neuson 5002009120 Nut Lock 5/16-18 Hex Serrated Flange

The Wacker Neuson Nut Lock 5/16-18 Hex Serrated Flange is a genuine OEM fastener designed for the WB16 series Power Buggies, including the WB16AE, WB16ADE, WB16AEF, WB16AES, WB16ADEF, WB16ADES, WB16AEFS, and WB16ADEFS models. Sourced directly from Wacker Neuson, this is the exact part used in original production — ensuring a correct fit without guesswork. The serrated flange profile locks firmly under load, resisting vibration-induced loosening that is common in compact equipment operating on rough terrain. Keep a few on hand as a low-cost insurance against fastener failure during demanding pours and material hauls.

Key Features

• OEM-Spec Thread Engagement — Genuine Wacker Neuson production part with the correct 5/16-18 thread pitch and hex geometry, ensuring full engagement and accurate torque transfer when installed.
• Serrated Flange Locking Action — The integrated serrated flange bites into the mating surface as the nut is tightened, providing mechanical resistance to back-off caused by equipment vibration and repeated loading cycles.
• Direct-Fit for WB16 Power Buggies — Confirmed fitment across the full WB16 series, including AE, ADE, AEF, AES, ADEF, ADES, AEFS, and ADEFS variants, so you can order with confidence.
• Genuine OEM Part — Manufactured to Wacker Neuson production standards, this fastener matches the original specification for material grade, thread form, and flange diameter — no substitutions or improvised hardware.
• Low-Cost Preventive Component — Replacing worn or damaged lock nuts at service intervals prevents loosened assemblies, unplanned disassembly, and accelerated wear on adjacent components.

A lock nut with a serrated flange is a two-in-one fastener that combines a standard hex nut with a built-in locking mechanism. The serrations on the underside of the flange cut into the surface of the mating component as the nut is driven down, creating a physical barrier against rotation. This is especially important on equipment like power buggies, where constant vibration, heavy loads, and rough ground conditions work to gradually loosen conventional fasteners. When a lock nut fails or is substituted with the wrong hardware, the clamping force holding critical assemblies together can be compromised — leading to movement, misalignment, or component damage over time.

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.