The Wacker Neuson 5200021636 is a genuine OEM Lock Washer designed for the APT4T and APT4S submersible pump series. As a direct factory replacement, this lock washer is sourced to the same specifications as the original hardware installed during production. It is confirmed compatible with the full range of APT4T and APT4S configurations, including Electric Brake, Surge Brake, and Cold Weather variants. Using the correct OEM hardware keeps fastened assemblies secure and maintains the structural integrity of critical pump connections.
Key Features
- Genuine OEM Hardware Grade — Manufactured to original equipment specifications, ensuring the correct tension retention and locking performance expected in submersible pump assemblies.
- Drop-In Replacement — Matches the original washer's dimensions and thread engagement profile for straightforward installation without rework.
- Broad APT Series Fitment — Compatible with APT4T (Electric Brake and Surge Brake) and APT4S (standard and Cold Weather) pump models, covering the full product family.
- Prevents Fastener Loosening — Lock washers resist vibration-induced loosening in pump environments where equipment cycling and fluid movement place repeated stress on threaded connections.
- Verified Wacker Neuson Part Number — Order with confidence using part number 5200021636 to confirm you are receiving the correct replacement hardware for your pump model.
A lock washer is a hardened fastening component placed beneath a nut or bolt head to prevent the fastener from backing out under vibration or repeated loading. In submersible pump applications like the APT4T and APT4S, assemblies are subject to constant operational vibration and pressure, making secure fastening essential for safe and leak-free performance. A missing or damaged lock washer can allow fasteners to loosen over time, leading to misalignment, fluid leaks, or premature wear on adjacent components.
Part Details
| Part Number | 5200021636 |
|---|---|
| Brand | Wacker Neuson |
| Part Type | Genuine OEM |
| Description | Lock Washer |
Compatibility & Fitment
| Name | Model | Machine Number |
|---|---|---|
| APT4T Pump, Electric Brake, Cold Weather | APT4T CW | 5200019793, 5200019792 |
| APT4S Pump w/Skid | APT4S | 5200018977 |
| APT4T Pump, Electric Brake | APT4T | 5200019644, 5200019643 |
| APT4S Pump w/Skid, Cold Weather | APT4S CW | 5200019798 |
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.
