The Multiquip 2021402 is a genuine OEM Lock Washer 1/4 designed for MQ and STOW diaphragm pump models including MQ-D206H, MQ-D305, MQ-D306HA, SDP-2, SDP-3, D306, and CA90749. As a direct OEM replacement, this lock washer meets the original assembly specifications Multiquip set for these diaphragm pump platforms. Sourced directly through authorized channels, the part ensures you are installing the correct hardware for a secure, lasting fit. DHS Equipment stocks this part to keep your diaphragm pump service work moving without delays.
Key Features
- Genuine OEM Hardware Grade — Manufactured to the exact material hardness and dimensional tolerances specified for Multiquip diaphragm pump assemblies, ensuring proper clamping force without fastener slippage.
- Drop-In Assembly Fit — Sized at 1/4 inch to seat directly into existing fastener positions on covered pump models, with no reworking of mounting hardware required.
- Broad Diaphragm Pump Compatibility — Confirmed fitment across MQ-D206H, MQ-D305, D306, MQ-D306HA, SDP-2, SDP-3, and CA90749 diaphragm pump models.
- Fastener Security Under Vibration — The lock washer design resists loosening caused by the continuous pump vibration and cyclic pressure loads inherent to diaphragm pump operation.
- Correct Part for Reassembly Confidence — Using the OEM 2021402 during service or rebuild work means fasteners torque to spec and hold, protecting surrounding pump components from movement-related wear.
A lock washer is a small but critical fastening component that sits between a bolt or nut and the mating surface to prevent the fastener from backing out during operation. In diaphragm pumps, which experience constant vibration and pressure cycling, loose fasteners can lead to fluid leaks, misaligned pump components, or structural failures at critical connection points. Replacing a worn or missing lock washer with the correct OEM part restores the clamping integrity of the assembly and protects the broader pump system from damage caused by fastener movement.
Part Details
| Part Number | 2021402 |
|---|---|
| Brand | Multiquip |
| Part Type | Genuine OEM |
| Description | Lock Washer 1/4 |
Compatibility & Fitment
| Name | Model |
|---|---|
| MQ Diaphragm Pumps | MQ-D206H |
| STOW Diaphragm Pumps | SDP-2 |
| MQ Diaphragm Pumps | MQ-D305 |
| MQ Diaphragm Pumps | D306 |
| MQ Diaphragm Pumps | MQ-D306HA |
| 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.
