Bomag 07990011 Square Key

The Bomag 07990011 Square Key is a genuine OEM component designed for a wide range of Bomag walk-behind and ride-on rollers, tandem rollers, single drum rollers, refuse and landfill compactors, cold milling machines, recyclers and stabilizers, and soil compactors. As a direct OEM replacement, this square key is manufactured to the same specification as the part that left the factory, ensuring correct dimensional tolerancing and material grade for dependable power transmission. Compatible machines span from compact walk-behind rollers such as the BW 60 S, BW 65 S, and BW 90 S through large ride-on units including the BW 225 D-3 single drum roller and BW 203 AD-4 tandem roller, as well as BC-series refuse and landfill compactors, BM-series cold milling machines including the BM 500/15 and BM 1000/35, and MPH and RS-series recyclers and stabilizers. Sourced directly through authorized supply channels, part number 07990011 is the correct OEM choice for technicians who need a verified, no-compromise replacement.

Key Features

• OEM Torque-Transfer Precision — machined to exact dimensional tolerances for correct shaft-to-hub engagement, ensuring full torque capacity without slippage or fretting
• Drop-In Shaft Fit — matches the original keyway geometry on Bomag driveline assemblies, seating flush without filing, shimming, or rework
• Broad Bomag Fleet Coverage — fits BW-series walk-behind light rollers, tandem rollers, and single drum rollers; BC-series refuse, landfill, and soil compactors; BM-series cold milling machines; and MPH and RS-series recyclers and stabilizers, including the BW 120 AD, BW 213 D, BC 771 RB, BM 1200/35, and MPH 122 among many others
• Prevents Drivetrain Damage — a worn or undersized square key allows the hub to spin on the shaft, causing rapid keyway wear and costly drivetrain failures; replacing it promptly protects surrounding components
• Genuine Bomag OEM Part — supplied as authentic Bomag stock under part number 07990011, backed by the quality assurance of the original equipment manufacturer

A square key is a small but critical drivetrain component that locks a rotating shaft to a mating hub, pulley, sprocket, or drum — transferring torque while preventing relative rotation between the two parts. It sits in a machined keyway cut into both the shaft and the hub, creating a positive mechanical connection that holds alignment under load. When a square key wears, shears, or is missing entirely, the hub can spin freely on the shaft, causing rapid keyway damage, loss of drive to the affected assembly, and potential secondary damage to gears, bearings, and housings — making timely replacement essential for keeping the machine operational and protecting more expensive surrounding components.

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.