The Wacker Neuson 5200021640 is a genuine OEM Lock Nut designed for the APT6T and APT6S submersible pump series. This includes Surge Brake, Electric Brake, Cold Weather, and Skid-mounted configurations across the APT6T and APT6S pump families. As a direct OEM part, the 5200021640 is manufactured to the same specifications as the original component installed at the factory, ensuring a correct, trouble-free fit every time. Whether you are servicing a standard APT6S Pump w/Skid or an APT6T Pump in a Cold Weather configuration, this lock nut is the right part for the job.
Key Features
- Genuine OEM Retention Integrity — Manufactured to the same thread pitch, hardness, and torque specification as the original, so the fastened joint holds securely under continuous pump operation.
- Drop-In Replacement — Matches the original thread form and seating geometry of the APT6T and APT6S assemblies, reinstalling exactly as the factory-fitted component did.
- Broad APT6 Series Coverage — Compatible across the full APT6T and APT6S lineup, including Surge Brake, Electric Brake, Cold Weather, and Skid variants.
- Maintains Clamping Force Under Vibration — A failed or stripped lock nut can allow connected components to loosen during pump operation, leading to accelerated wear or misalignment; the 5200021640 restores the original locking function.
- Fuel System and Fastener Safety — On submersible pump assemblies, properly torqued and locked fasteners are critical to maintaining sealed connections and preventing operational failures in wet or pressurized environments.
A lock nut is a prevailing-torque fastener designed to resist loosening caused by vibration and dynamic loads. In submersible pump assemblies like the APT6T and APT6S, lock nuts secure critical connections that must remain tight through continuous operation in wet, high-vibration environments. When a lock nut wears, strips, or loses its locking capability, the fastened joint can back off progressively, leading to component misalignment, leaks, or mechanical failure. Replacing a worn lock nut with a correctly rated OEM unit restores the clamping integrity the assembly was engineered to maintain.
Part Details
| Part Number | 5200021640 |
|---|---|
| Brand | Wacker Neuson |
| Part Type | Genuine OEM |
| Description | Lock Nut |
Compatibility & Fitment
| Name | Model | Machine Number |
|---|---|---|
| APT6T Pump, Electric Brake, Cold Weather | APT6T CW | 5200019795, 5200019794 |
| APT6S Pump w/Skid | APT6S | 5200018982 |
| APT6T Pump, Surge Brake | APT6T | 5200019646, 5200019647 |
| APT6S Pump w/Skid, Cold Weather | APT6S CW | 5200019799 |
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.
