The Bomag 05504100 Square Key is a genuine OEM component designed for Bomag cold milling machines, including the BM 1000/35, BM 1200/35, BM 1200/35 T4f, BM 1300/35, BM 1300/35 T4f, BM 2000/75, and BM 2200/75. Sourced directly from Bomag, this square key delivers an exact, factory-correct fit with no guesswork on compatibility. It is an essential hardware component that keeps rotating assemblies properly locked and aligned, ensuring your cold milling machine stays productive on the job.
Key Features
- OEM-Grade Dimensional Accuracy — machined to Bomag's original tolerances, ensuring the correct keyway engagement that prevents shaft slippage and premature wear in cold milling applications.
- Direct Drop-In Replacement — this square key seats into the existing keyway without modification, restoring the original drive connection as intended by the manufacturer.
- Broad Cold Milling Machine Coverage — confirmed fitment across the BM 1000/35, BM 1200/35, BM 1200/35 T4f, BM 1300/35, BM 1300/35 T4f, BM 2000/75, and BM 2200/75 cold milling machines.
- Verified Genuine OEM Part — supplied under part number 05504100 directly from Bomag, so you receive the same component installed at the factory.
- Protects High-Value Drive Components — a correctly fitted square key distributes torque evenly across the shaft and hub, reducing stress on surrounding drive components and extending their service life.
A square key is a small but critical power-transmission component that locks a rotating shaft to a hub, pulley, sprocket, or gear, ensuring both parts turn together as a single unit. Without a correctly seated square key, torque cannot transfer reliably — resulting in slipping, vibration, and rapid damage to the shaft or mating bore. On a cold milling machine like the BM-series, where drive components operate under significant load and vibration, a worn or sheared key can quickly escalate into a costly drivetrain repair. Replacing this part at the first sign of wear keeps the drive assembly functioning as designed and protects surrounding components from secondary damage.
Part Details
| Part Number | 05504100 |
|---|---|
| Brand | Bomag |
| Part Type | Genuine OEM |
| Description | Square Key |
Compatibility & Fitment
| Name | Model | Machine Number |
|---|---|---|
| Cold Milling Machine | BM 1000/35 | 00824229, 00824569, 00824795 |
| Cold Milling Machine | BM 1300/35 | 00824535, 00824633, 00824799 |
| Cold Milling Machine | BM 1200/35 | 00824631, 00824797 |
| Cold Milling Machine | BM 2000/75 | 00824741 |
| Cold Milling Machine | BM 2200/75 | 00824801 |
| Cold Milling Machine | BM 1200/35 T4f | 00825167 |
| Cold Milling Machine | BM 1300/35 T4f | 00825169 |
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.
