Wacker Neuson 5000115922 Square Key 3/8 X 1-1/2, 4140, 320Bhn

The Wacker Neuson is a genuine OEM Square Key 3/8 X 1-1/2, 4140, 320Bhn designed for the CRT36 and CRT48 series ride-on concrete trowels. Sourced directly from Wacker Neuson, this key is manufactured to the exact material grade and hardness specification — 4140 alloy steel at 320 Bhn — ensuring it meets the torque and wear demands of professional concrete finishing equipment. The is confirmed compatible across a wide range of CRT36 and CRT48 models, including standard, high-speed, power-steer, dual-fuel, and electronic-steering variants. Keeping this small but critical drive component in top condition is essential to maintaining proper power transfer through the trowel's drivetrain.

Key Features

• 4140 Alloy Steel at 320 Bhn — Manufactured from 4140 chromoly steel hardened to 320 Bhn, delivering the shear strength and wear resistance required in a high-torque concrete trowel drivetrain.
• Exact OEM Dimension — Cut to a precise 3/8 x 1-1/2 inch profile for a flush, slip-free fit in the keyway with no filing or shimming needed.
• Broad CRT Series Compatibility — Fits an extensive range of CRT36 and CRT48 ride-on trowel configurations, including standard, high-speed, power-steer, dual-fuel, and electronically steered models.
• Protects Shaft and Hub from Rotational Slip — A worn or undersized key allows shaft-to-hub slippage, causing premature wear on both mating components and loss of rotor drive efficiency on the trowel blades.
• Genuine Wacker Neuson OEM Part — Supplied as an original equipment component, so material spec, hardness rating, and dimensional tolerances match what was installed at the factory.

A square key is a small rectangular drive component seated in matching keyways cut into both a shaft and its mating hub or gear. Its job is to lock the two together rotationally so torque transfers cleanly from one to the other without slippage. On a ride-on concrete trowel, this type of key typically secures a drive component within the gearbox or rotor assembly, where consistent torque delivery directly controls blade speed and finishing quality. When a key shears, deforms, or wears oversize, the shaft and hub begin to rotate independently, causing erratic blade performance, accelerated wear on the mating keyways, and potential drivetrain damage if not addressed promptly.

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.