Multiquip 12736 Key, Hardened 3/8 X 1-1/2

The Multiquip 12736 is a genuine OEM Key, Hardened 3/8 X 1-1/2 designed for Whiteman and International ride-on power trowel models including HHN31V, HHN34TVD, HHXD5, HHXG5, HHXD5-ES, HHXDF4-DF5, HHNG5, and EHHNK5. As a direct-source OEM component, 12736 is manufactured to the exact material hardness and dimensional tolerances specified for these machines. DHS Equipment supplies this part as an authorized Multiquip dealer, so you can order with confidence knowing you are receiving the correct part for your trowel.

Key Features

• Hardened Steel Construction — Manufactured to the specified 3/8 x 1-1/2 hardened steel profile, delivering the shear resistance and wear life required in a high-torque trowel drivetrain.
• Drop-In Dimensional Fit — Matches the original keyway geometry on HHN and HHX series trowels, seating fully into the keyway slot without filing or reworking.
• Broad HHN and HHX Series Coverage — Confirmed fitment across HHN31V, HHN34TVD, HHXD5, HHXG5, HHXD5-ES, HHXDF4-DF5, HHNG5, and EHHNK5 ride-on trowels.
• Drivetrain Torque Transmission — A correctly sized and hardened key locks rotating components to the shaft so power transfers cleanly to the trowel blades — a worn or undersized key causes slippage and blade speed loss.
• Genuine OEM Part — Sourced directly from Multiquip, part 12736 meets the same specification as the component originally installed at the factory.

A hardened key is a small but critical drivetrain component that locks a rotating element — such as a pulley, sprocket, or gear — to its drive shaft. It sits in a machined slot called a keyway and transfers rotational torque between the shaft and the mounted component, preventing them from spinning independently under load. When a key wears, shears, or goes missing, the driven component can slip or freewheel on the shaft, causing a direct loss of power transmission to the trowel blades and potential damage to the keyway itself if the machine continues to operate.

Part Details

Compatibility & Fitment

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.