The Multiquip 2021200 is a genuine OEM Lock Washer 1/2 designed for Multiquip and STOW diaphragm pump models including SDP-2, SDP-3, MQ-D206H, and CA90749. As an authentic Multiquip OEM component, this washer is manufactured to the same specifications as the original hardware installed at the factory, ensuring a correct and secure fit. If you are servicing a diaphragm pump in the SDP or MQ-D206H series, this is the exact hardware replacement you need to restore proper fastener clamping force and joint integrity.
Key Features
- Genuine OEM Hardware Grade — Manufactured to the same material hardness and spring tension specifications as the original, maintaining consistent clamping load across fastened joints.
- Direct Bolt-On Replacement — Sized at 1/2 inch to match existing fastener assemblies on diaphragm pump components — installs without rework or modification to surrounding hardware.
- Confirmed Fitment — Compatible with STOW diaphragm pump models SDP-2, SDP-3, and CA90749, as well as the Multiquip MQ-D206H diaphragm pump.
- Prevents Fastener Backout — The lock washer's helical design bites into mating surfaces under torque, resisting vibration-induced loosening that is common in pump and engine-driven equipment.
- Critical Service Hardware — Using the correct washer spec during pump disassembly and reassembly ensures fastener preload is maintained, protecting gaskets, flanges, and diaphragm housings from leaks caused by under-clamped joints.
A lock washer is a hardened fastener component placed beneath a bolt or nut to resist loosening caused by vibration and dynamic loads. In diaphragm pump applications, where the pumping action creates continuous pulsing forces throughout the housing, maintaining consistent fastener tension is essential to keeping fluid-side joints sealed and structurally sound. When a lock washer fails, flattens, or is omitted during reassembly, fasteners can back out over time, leading to fluid leaks, misaligned components, and accelerated wear on surrounding hardware.
For assistance confirming this part fits your specific unit, contact the DHS Equipment team directly.
Part Details
| Part Number | 2021200 |
|---|---|
| Brand | Multiquip |
| Part Type | Genuine OEM |
| Description | Lock Washer 1/2 |
Compatibility & Fitment
| Name | Model |
|---|---|
| STOW Diaphragm Pumps | SDP-2 |
| MQ Diaphragm Pumps | MQ-D206H |
| STOW Diaphragm Pumps | SDP-3 |
| STOW Diaphragm Pumps | CA90749 |
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.
