What are the benefits of the 4+2 bearing configuration?

The 4+2 setup uses four high-precision bearings at the front to handle the primary radial and axial cutting forces, while two rear bearings provide rotational stability. This configuration significantly enhances the spindle's rigidity, allowing for heavier cuts and better surface finishes during industrial milling.

Does this spindle require daily lubrication?

No. This spindle is grease-packed, which means it is factory-lubricated for its operational lifespan under normal conditions. This reduces maintenance downtime and ensures consistent performance without the need for an external oil mist system.

Why is the 120H6 locating diameter important?

The 120H6 specification refers to a high-precision tolerance for the spindle body diameter. This ensures a perfect, concentrated fit into the machine headstock, which is vital for maintaining micron-level rotational accuracy and absorbing high-torque vibration.

CNC Spindle Motor✓ In Stock & Ready to Ship

BT40 120MM Milling Spindle for High-Torque Vertical Milling Machines

SKU / Model: MTMSBT40120

Power RatingIndustrial Grade

Max SpeedUp to 60,000 RPM

Cooling MethodStandard Cooled

Interface / Specbt40

The BT40 120mm Milling Spindle is a heavy-duty mechanical core engineered for industrial Vertical Milling Machines (VMC) that demand a balance of high rotational speed and extreme clamping rigidity. Featuring a standard BT-40 nose taper, this spindle ensures seamless integration with a wide range of industrial tooling for efficient material removal. The unit is designed with a precision-ground 120H6 locating diameter and a 165mm flange, providing a stable, high-accuracy mounting profile within the machine headstock.

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