The Wacker Neuson 5200021637 is a genuine OEM Lock Washer designed for the APT6T and APT6S series submersible pumps. As a direct factory replacement, this washer is sourced to the same specifications as the original component, covering standard, surge brake, electric brake, and cold weather pump configurations across both series. Whether you are servicing an APT6T Pump with Electric Brake, an APT6S Pump with Skid, or a cold weather variant, part number 5200021637 is confirmed to fit the full range of APT6T and APT6S machines. Keeping the correct hardware in place is essential to maintaining secure assembly integrity and preventing component loosening under the vibration and load cycles these pumps experience in the field.
Key Features
- Genuine OEM Hardware Grade — Manufactured to Wacker Neuson's original material and hardness specifications, ensuring the washer delivers the correct clamping and locking force for fastener retention in pump assemblies.
- Direct Drop-In Replacement — Installs in the same position as the original, with no rework or fitting adjustments needed to seat correctly within the APT6T and APT6S pump assembly.
- Broad APT6 Series Coverage — Verified fitment across APT6T and APT6S configurations, including standard, surge brake, electric brake, and cold weather variants.
- Vibration Resistance — Lock washers in pump assemblies resist fastener back-off caused by continuous motor vibration; a worn or missing washer can allow critical fasteners to loosen, leading to leaks or structural failure.
- Fastener Integrity and Safety — In electrically driven submersible pumps, loose fasteners caused by a failed lock washer can compromise housing seals and electrical connections, making correct hardware replacement a safety-relevant service step.
A lock washer is a small but critical piece of hardware placed beneath a fastener to prevent it from loosening due to vibration, torque, or thermal cycling. In submersible pump applications like the APT6T and APT6S series, the pump motor and impeller generate continuous vibration during operation, which places constant stress on every threaded connection in the assembly. When a lock washer wears out, deforms, or goes missing, the fastener it supports can gradually back off, compromising housing seals, structural integrity, and in electrically driven pumps, the safety of the overall assembly. Replacing worn or damaged lock washers with the correct OEM part during routine service is a straightforward step that protects the pump's long-term performance.
Part Details
| Part Number | 5200021637 |
|---|---|
| Brand | Wacker Neuson |
| Part Type | Genuine OEM |
| Description | Lock Washer |
Compatibility & Fitment
| Name | Model | Machine Number |
|---|---|---|
| APT6T Pump, Electric Brake | APT6T | 5200019647, 5200019646 |
| APT6S Pump w/Skid | APT6S | 5200018982 |
| APT6T Pump, Surge Brake, Cold Weather | APT6T CW | 5200019794, 5200019795 |
| 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.
