The Multiquip 0520040451 Key 6.3x51 is a genuine OEM component designed for QP4TZ, QP4TE, QP4TZTMP16F, QP4TZTMPXF, and QP4TZT10P series trash pumps. As a direct OEM replacement, this key is manufactured to the exact dimensions required for proper shaft and impeller alignment on Multiquip trash pump equipment. Sourced directly through an authorized Multiquip parts channel, the part ensures a correct, confident fit every time. DHS Equipment stocks this part ready for order to keep your pump back in service without the guesswork of finding a substitute.
Key Features
- Exact OEM Dimensions — Manufactured to the precise 6.3x51 specification required for correct seating in Multiquip trash pump shaft keyways.
- Direct Shaft-to-Impeller Engagement — Drops into the keyway channel without modification, restoring the positive drive connection between shaft and impeller.
- Broad Trash Pump Fitment — Compatible with QP4TZ, QP4TE, QP4TZTMP16F, QP4TZTMPXF, and QP4TZT10P models from the Multiquip quick-prime trash pump lineup.
- Prevents Slippage and Drive Loss — A correctly sized key locks the impeller to the drive shaft, maintaining full pump output and preventing costly wear from rotational slippage.
- Genuine OEM Confidence — Sourced as a genuine Multiquip part, so material hardness and shear tolerance meet the original design standard for this application.
A shaft key is a small precision component that fits into a machined slot — called a keyway — cut into both the drive shaft and the impeller hub, locking them together so they rotate as a single unit. In a trash pump, this connection is critical: the impeller is what moves water and debris, and it depends entirely on the key to transfer rotational force from the engine-driven shaft. When a key shears, wears, or goes missing, the shaft spins freely inside the impeller hub, resulting in a complete loss of pumping capacity even though the engine continues to run. Replacing a worn or broken key with the correct OEM part — the right width, height, and length — restores that positive drive engagement immediately.
Part Details
| Part Number | 0520040451 |
|---|---|
| Brand | Multiquip |
| Part Type | Genuine OEM |
| Description | Key 6.3x51 |
Compatibility & Fitment
| Name | Model |
|---|---|
| MQ Trash Pumps | QP4TZ |
| MQ Trash Pumps | QP4TE |
| MQ Trash Pumps | QP4TZTMP16F |
| MQ Trash Pumps | QP4TZTMPXF |
| MQ Trash Pumps | QP4TZT10P |
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.
