The Wacker Neuson 5200021641 is a genuine OEM Lock Nut designed for the APT8S and APT8T pump series. As a factory-sourced component, it is manufactured to the same specifications as the original hardware installed at the factory, ensuring a proper fit across all covered configurations. This Lock Nut is confirmed to fit the APT8S Pump with Skid, APT8S Pump with Skid Cold Weather, APT8T Pump with Surge Brake, APT8T Pump with Electric Brake, and their corresponding Cold Weather variants. Ordering by part number 5200021641 ensures you receive the correct fastener for your specific machine configuration.
Key Features
- Genuine OEM Hardware Grade — Sourced directly from Wacker Neuson, this Lock Nut meets the original torque retention and thread engagement specifications required for secure pump assembly.
- Drop-In Fastener Replacement — Threads match the original mounting point exactly, allowing straightforward installation without reworking surrounding components.
- Broad APT8 Series Coverage — Compatible with APT8S and APT8T configurations, including Surge Brake, Electric Brake, and Cold Weather variants, covering the full range of APT8 pump skid assemblies.
- Maintains Clamping Integrity — A correctly torqued Lock Nut holds critical pump components securely in position; a worn or missing fastener can allow vibration-induced loosening that leads to misalignment or component damage.
- Verify by Part Number — Cross-reference 5200021641 against your machine's parts manual to confirm fitment before ordering, especially across Surge Brake and Electric Brake model variants.
A Lock Nut is a fastener engineered to resist loosening under vibration and dynamic loads. Unlike a standard hex nut, it incorporates a locking feature — such as a nylon insert or prevailing-torque thread form — that maintains clamping force even when the assembly is subject to continuous movement or mechanical stress. On pump equipment like the APT8S and APT8T, where vibration is inherent to operation, using the correct Lock Nut in the specified location is essential to keeping assembled components secure. If a Lock Nut fails or is replaced with an incorrect fastener, the resulting loss of clamping force can lead to component shift, accelerated wear, or failure of the surrounding assembly.
Part Details
| Part Number | 5200021641 |
|---|---|
| Brand | Wacker Neuson |
| Part Type | Genuine OEM |
| Description | Lock Nut |
Compatibility & Fitment
| Name | Model | Machine Number |
|---|---|---|
| APT8S Pump w/Skid, Cold Weather | APT8S CW | 5200019800 |
| APT8S Pump w/Skid | APT8S | 5200018987 |
| APT8T Pump, Surge Brake, Cold Weather | APT8T CW | 5200019796, 5200019797 |
| APT8T Pump, Surge Brake | APT8T | 5200019648, 5200019649 |
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.
