The Multiquip 501019 is a genuine OEM Square Key 3/16" x 45mm 5.5 HP designed for MQ Mixers, Whiteman Mixers, and Essick Mixers, including models MC64SK/MC64PK, MC64P/S, WM70S/P, MC44S, WM63H8, WM63H5. As a factory-sourced component, it meets the exact dimensional and material specifications set by Multiquip, ensuring a true drop-in fit with no guesswork at installation. If you are servicing a mixer from any of these families, verifying the correct key size is critical — 501019 is the confirmed OEM part for 5.5 HP drive configurations across these lines.
Key Features
- Genuine OEM Dimensional Accuracy — Machined to the exact 3/16" width and 45mm length specified for 5.5 HP shaft-to-hub drive applications, eliminating slop or play at the keyway.
- Direct Keyway Replacement — Drops into the existing keyway seat on the shaft and hub without filing, shimming, or fitting — sized to engage cleanly on first installation.
- Broad Mixer Compatibility — Confirmed fitment across MC64SK, MC64PK, MC64P, MC64S, WM70S, WM70P, MC44S, WM63H8, WM63H5, WM63E, and EM70P/S mixer models.
- Drive Torque Transmission — A correctly sized square key maintains full, positive torque transfer between the shaft and driven component; an undersized or worn key causes slippage, rattling, and accelerated keyway damage.
- Sourced from Multiquip — Supplied as a factory OEM component, so the part number, geometry, and material grade match the original production specification for these mixer platforms.
A square key is a small but load-critical drive component fitted into a machined slot — called a keyway — cut into both a rotating shaft and the hub of the component it drives, such as a sprocket, gear, or drum coupling. It locks the two parts together rotationally so that torque from the engine or motor is transmitted cleanly to the driven assembly without slippage. When a square key wears, shears, or is the wrong size, drive engagement is lost or becomes intermittent, which can result in drum speed loss, noisy operation, and rapid secondary damage to the keyway itself — making timely replacement with the correctly sized OEM key essential.
Part Details
| Part Number | 501019 |
|---|---|
| Brand | Multiquip |
| Part Type | Genuine OEM |
| Description | Square Key 3/16" x 45mm 5.5 HP |
Compatibility & Fitment
| Name | Model |
|---|---|
| MQ Mixers | MC64SK/MC64PK |
| MQ Mixers | MC64P/S |
| Whiteman Mixers | WM70S/P |
| MQ Mixers | MC44S |
| Whiteman Mixers | WM63H8 |
| Whiteman Mixers | WM63H5 |
| Whiteman Mixers | WM63E |
| Essick Mixers | EM70P/S |
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.
