The Wacker Neuson Square Key 1/4 X 7/8 is a genuine OEM component designed for the RD12A-90 tandem roller, RD11A and RD11V hydrostatic double drum vibratory rollers, RS800 and RS800A single drum vibratory rollers, RSS800A walk-behind roller, and RD880V double drum vibratory roller series. As a direct OEM part, the is manufactured to Wacker Neuson's exact dimensional specifications, ensuring a flush, secure fit in the keyway without rework or shimming. Whether you are servicing a walk-behind tandem roller or a single drum machine, this square key delivers the precise shaft-to-hub engagement that keeps drive components transferring torque correctly.
Key Features
- Exact OEM Dimensional Tolerancing — Manufactured to Wacker Neuson's specified 1/4 x 7/8 cross-section, ensuring the key seats fully in the keyway without play or binding.
- Direct Drop-In Installation — Matches the original keyway geometry on RD and RS series roller drive shafts, slotting in without filing or fitting.
- Broad Roller Family Coverage — Compatible with RD12A-90, RD11A, RD11AEC, RD11V, RD880V, RS800, RS800A, RS800H, RS800V, RSS800A, and related single and double drum roller models.
- Torque Transfer Integrity — A correctly fitted square key locks the hub to the shaft so drive power transfers cleanly; a worn or missing key causes slippage, vibration, and accelerated wear on both the shaft and hub bore.
- Genuine Wacker Neuson OEM Part — Sourced directly from Wacker Neuson, this component carries the same part number and material grade as the original installed at the factory.
A square key is a small but critical power-transmission component that sits in matching slots — called keyways — cut into both a shaft and the hub of a gear, sprocket, or drum drive. Its job is to create a positive mechanical lock between the two parts so rotational force from the shaft is transferred directly to the driven component without slippage. On vibratory rollers like the RD and RS series, this connection is under constant load from the vibration system and propulsion drive, making material integrity and dimensional accuracy essential. When a square key shears, deforms, or works loose, the result is lost drive engagement, unusual noise, and rapid damage to the shaft and hub surfaces that can turn a minor part replacement into a costly shaft repair.
Part Details
| Part Number | 5000052027 |
|---|---|
| Old Part Number | 0052027 |
| Brand | Wacker Neuson |
| Part Type | Genuine OEM |
| Description | Square Key 1/4 X 7/8 |
Compatibility & Fitment
| Name | Model | Machine Number |
|---|---|---|
| RD12A-90 ROLLER,DBL DRUM,GRN | RD12A-90 | 5000620369, 5000620058, 5000620320 |
| Single Drum Vibratory Roller | RS800A | 5000006581, 5000630011 |
| Single Drum Vibratory Roller | RSS800A | 5000006582, 5000630012 |
| Hydrostatic Double Drum Vibrat ory Roller | RD11AEC | 5000007695 |
| Hydrostatic Double Drum Vibrat ory Roller | RD11V | 5000007694 |
| Hydrostatic Double Drum Vibrat ory Roller | RD11A | 5000007693 |
| Single Drum Vibratory Roller | RS800H | 5000006583 |
| Single Drum Vibratory Roller ( without engine) | RS800 | 5000006585 |
| Single Drum Vibratory Roller | RS800V | 5000007187 |
| Double Drum Vibratory Roller | RD880V | 5000006736 |
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.
