The Multiquip 21410 Woodruff Key #1008 5/16" x 1" is a genuine OEM component designed for MQD2HA, MQD3HA, MQD2H, and MQD3H diaphragm pumps. As a certified OEM part, the 21410 meets Multiquip's exact dimensional tolerances, ensuring the key seats correctly and locks rotating components in precise angular alignment. Sourced directly through authorized Multiquip supply channels, this is a direct drop-in replacement with no fitting or machining required. DHS Equipment stocks genuine Multiquip parts so you can get your pump back in service fast.
Key Features
- Exact OEM Dimensions — Manufactured to the #1008 Woodruff key standard at 5/16" x 1", delivering the precise seat depth and width needed to maintain shaft-to-hub alignment in diaphragm pump applications.
- Direct Slot Fit — Matches the factory keyway dimensions on MQD-series pump shafts, dropping into the cut without any filing or adjustment.
- Broad MQD-Series Compatibility — Confirmed fitment for MQD2HA, MQD3HA, MQD2H, and MQD3H Multiquip diaphragm pumps, covering both standard and high-airflow variants in the series.
- Torque Transfer Integrity — A correctly sized Woodruff key prevents shaft slip under load, protecting impeller timing and maintaining consistent pump output through demanding continuous-duty cycles.
- Genuine Multiquip OEM Part — Carries full Multiquip OEM traceability under part number 21410, so you know the material grade and geometry match what left the factory originally.
A Woodruff key is a small, semi-circular or rectangular drive key that fits into a milled slot on a shaft and a corresponding keyway in a hub or impeller, locking the two components together so they rotate as a single unit. In a diaphragm pump, it transmits torque from the engine or motor shaft to the pump drive assembly, keeping the drive mechanism in correct timing. When a Woodruff key shears, wears, or works loose, the shaft and hub lose their positive drive connection — causing slippage, loss of pump output, vibration, and accelerated damage to the keyway itself.
Part Details
| Part Number | 21410 |
|---|---|
| Brand | Multiquip |
| Part Type | Genuine OEM |
| Description | Woodruff Key #1008 5/16" x 1" |
Compatibility & Fitment
| Name | Model |
|---|---|
| Diaphragm Pumps | MQD2HA |
| Diaphragm Pumps | MQD3HA |
| 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.
