3 Bolt Head Mount is now standard (where the head mounts to the Z Axis), for more rigidity when milling – Much improved over the single bolt mount type.

Total Length of the Spindle: 545mm. This Product Is a High Quality R8 Spindle + Bearing for 3#4# Milling Machine. After the Spindle Is Replaced, It Can Change the Surface or Side of the Milling Workpiece Caused by the Tool Wear Caused by the Long Wear of the Spindle and the Bearing Clearance.

Mill Machine Parts R8 Spindle + Bearings Assembly Fit BRIDGEPORT Milling US Product description: This product is a high quality R8 spindle + bearing for 3#4# milling machine. After the spindle is replaced, it can change the surface or side of the milling workpiece caused by the tool wear caused by the long wear of the spindle and the bearing clearance. Smooth, rough and uneven! Product specifications: Name: Milling R8 spindle + bearing Total length of the spindle: 545mm Head outer diameter: 46mm Spline outer diameter: 25mm D:25mm D1:20mm B:6mm Bearing position: 35mm and 30mm Packing size: 561010cm Weight: 4.2kg Scope of application: Most milling machines (3#4# milling machine) The package includes: 1X R8 spindle + bearing.