Multiquip 12316 WDF Key 5 X 16

The Multiquip 12316 WDF Key 5 X 16 is a genuine OEM component designed for a wide range of Multiquip and Whiteman equipment, including C30HDN series concrete pumps, MD105 and STX series ride-on power trowels, HTX series ride-on power trowels, and HHN series mechanical ride-on trowels. This keyed fastener is an exact OEM replacement sourced directly through Multiquip's authorized parts network, ensuring correct dimensional fit across all compatible models. When a worn or missing key causes drivetrain slippage or shaft disengagement, replacing it promptly with the correct OEM part restores proper mechanical coupling and keeps your machine operating as intended.

Key Features

• Genuine OEM Dimensional Accuracy — Manufactured to Multiquip's exact 5 x 16 mm specification, ensuring proper seating in the keyway without over-tolerance play that can cause shaft fretting or premature wear.
• Direct Drop-In Replacement — Matches the original keyway geometry on compatible shafts, allowing straightforward installation without filing, shimming, or custom fitting.
• Broad Cross-Family Fitment — Verified for C30HDN concrete pump models, MD105, STX, STXDF, STX55Y6, STX55J6, STX6H, STXD6i, HTX6H, HTX44K4, HTX44K5, HTXG6DF, HTXD6i, HHNG5, HHN31V, HTN27K, HTN28K, and additional Whiteman ride-on trowel variants.
• Maintains Positive Shaft-to-Hub Drive Transfer — A correctly fitted key locks rotating components to their shafts so torque transfers cleanly; a worn or incorrectly sized key allows rotational slipping that damages mating components over time.
• Backed by Multiquip's OEM Parts Program — Supplied as a genuine Multiquip part, this component meets the same material hardness and shear-strength standards as the key originally installed at the factory.

A woodruff or parallel key is a small but mechanically critical component that locks a rotating shaft to a hub, gear, sprocket, or pulley by sitting in a machined slot — the keyway — cut into both mating parts. It transfers rotational torque between the two components, preventing them from spinning independently of each other. When a key shears, deforms, or falls out, the driven component loses its positive connection to the shaft, resulting in loss of power transmission, unusual noise, and rapid wear to the keyway itself. Replacing a damaged key promptly with the correctly sized OEM part prevents secondary damage to the shaft and hub and restores full drivetrain integrity.

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.