The Multiquip 178800100 is a genuine OEM Lock Washer 1/4 designed for MQD2H and MQD3H diaphragm pumps. As a factory-authorized component, this washer is manufactured to the exact dimensions and material specifications required for proper fastener retention on Multiquip diaphragm pump assemblies. Verified fitment for MQD2H and MQD3H models means you can order with confidence that 178800100 will seat and function correctly without rework or improvisation. Sourced directly through the Multiquip parts network, this is the same part installed at the factory.
Key Features
- Genuine OEM Hardened Construction — Manufactured to the same material hardness and surface finish specification as the original, ensuring consistent locking force without deforming under torque load.
- Exact 1/4" Bore Dimension — Sized precisely for 1/4" fastener shafts, so the washer seats flush and bites correctly against mating surfaces without slipping or over-compressing.
- Confirmed Fitment for MQD2H and MQD3H — Verified for Multiquip MQD2H and MQD3H diaphragm pump models, covering common fastener locations throughout the pump assembly.
- Prevents Fastener Loosening Under Vibration — Diaphragm pumps generate significant cyclic vibration during operation; a correctly spec'd lock washer maintains clamping force and prevents fasteners from backing out over time.
- Direct OEM Replacement — Matches the original part by Multiquip part number 178800100, dropping into existing bolt positions without any modification to hardware or mating components.
A lock washer is a small but critical fastener component that sits between a bolt head or nut and the mating surface to prevent the fastener from loosening due to vibration, thermal cycling, or mechanical stress. On a diaphragm pump like the MQD2H and MQD3H, where the pumping action creates continuous cyclic movement, loose fasteners can lead to fluid leaks, structural misalignment, or component separation. Replacing a worn or damaged lock washer with the correct OEM part restores the integrity of the fastener joint and keeps the pump operating as intended.
For questions about fitment or to confirm compatibility with your specific unit, contact the DHS Equipment parts team for assistance.
Part Details
| Part Number | 178800100 |
|---|---|
| Brand | Multiquip |
| Part Type | Genuine OEM |
| Description | Lock Washer 1/4 |
Compatibility & Fitment
| Name | Model |
|---|---|
| Diaphragm Pumps | MQD2H |
| Diaphragm Pumps | MQD3H |
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.
