Wacker Neuson 5000012997 Lock Nut M5

The Wacker Neuson Lock Nut M5 is a genuine OEM fastener designed for the AR external concrete vibrator series, APS and AP battery-powered vibratory plate series, APU vibratory plate series, and associated FU/FUE frequency converter units. As a direct factory replacement, this M5 lock nut matches the exact thread pitch, material grade, and locking specification called out in Wacker Neuson engineering documentation. Fitment spans an extensive range of AR 41, AR 42, AR 43, AR 44, AR 51, AR 52, AR 53, AR 54, AR 61, AR 62, AR 63, AR 64, and AR 75 external vibrators, as well as APS1030, APS1135, APS1340, APS1550, APS2050, AP1840, AP1850, AP2560, APU2840, APU2850, APU2860, APU3050, APU3340, APU3350, APU3360, WP1550, ARS90e, and compatible FU and FUE converter models. Always verify your model and machine number before ordering to confirm applicability.

Key Features

• Genuine OEM Locking Specification — Manufactured to Wacker Neuson's exact M5 thread class and prevailing-torque retention standard, ensuring the nut holds secure under the continuous vibration loads inherent to external vibrator and vibratory plate operation.
• Direct-Fit Replacement — Matches the original fastener profile for straightforward installation using standard M5 tooling; no thread chasing or hardware substitution needed.
• Broad Fitment Across AR and APS/AP/APU Families — Confirmed for AR 41 through AR 75 external vibrators across multiple voltage and rpm configurations, plus APS, AP, APU, WP, ARS, and FU/FUE converter units.
• Vibration-Resistant Retention — The lock nut's prevailing-torque design resists self-loosening under the cyclic loads generated by rotating eccentric weights, preventing fastener migration that could cause component misalignment or housing damage.
• Critical Fastener Integrity — On electrical and rotating external vibrator assemblies, a loose or failed lock nut can allow housing panels or mounting brackets to shift, creating both a performance and a safety hazard; using the correct OEM fastener maintains the integrity of the assembly.

A lock nut is a fastener engineered to resist loosening when subjected to vibration and dynamic loading. Unlike a standard nut, it incorporates a locking feature — such as a distorted thread or nylon insert — that maintains clamping force even as the surrounding assembly cycles through repeated movement. In external concrete vibrators and vibratory compaction plates, virtually every fastener in the housing and mounting system is exposed to constant high-frequency vibration; a lock nut that has loosened or failed can allow panels, brackets, or rotating components to shift out of position, leading to accelerated wear, structural noise, or more serious mechanical failure. Replacing a worn or missing lock nut promptly with the correct OEM part keeps the assembly properly torqued and the machine performing as intended.

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.