Lathe Chuck Bison-Bial FI 250 (model 353204060500) — 250 mm internal diameter

Bison-Bial FI 250 self-centering face-mounted lathe chuck with a 250 mm internal diameter is designed to secure cylindrical and irregular workpieces for turning and machining on compatible lathes. The chuck provides concentric clamping via a 3- or 4-jaw configuration and is intended for installation on turntable spindles that accept face-mounted chucks. Its robust construction ensures stable holding during metalworking and workshop operations where precise, repeatable clamping is required.

Advantages

The chuck delivers reliable self-centering action that simplifies setup and reduces alignment time. A solid face-mounted design gives consistent rigidity and vibration resistance during medium- to heavy-duty turning. Compatibility with both 3- and 4-jaw setups offers flexibility for different workpiece shapes and machining requirements. The 250 mm diameter provides a balance between clamping capacity and usable swing for a wide range of workshop tasks.

Suitable for

• General turning and facing of metal workpieces
• Holding cylindrical, stepped, and some irregular shapes using adjustable jaws
• Workshop and small-series production where repeatable, concentric clamping is needed
• Machining operations requiring a face-mounted chuck on compatible lathe spindles

Key specifications

• Type: self-centering face-mounted lathe chuck
• Mounting: face-mounted on compatible lathe spindles
• Clamping diameter: 250 mm internal usable diameter
• Jaw configuration: supports 3- or 4-jaw arrangements for different workpiece profiles
• Construction: robust metal body designed for stability and vibration damping during turning

How to use

Mount the chuck onto a compatible lathe spindle following the machine manufacturer's mounting and safety instructions. Select the appropriate jaw set (3- or 4-jaw) and position jaws to suit the workpiece profile. Place the workpiece in the chuck and tighten jaws evenly to achieve concentric clamping; verify runout with a dial indicator if high precision is required. During machining, monitor grip and periodically check jaw tightness and alignment, especially after heavy cuts. Follow all lathe safety procedures, including guarding and appropriate speeds and feeds for the material being machined.

Usage recommendations

Use properly matched jaws and ensure the chuck and spindle faces are clean before mounting. For best concentricity, pre-center the workpiece when possible and verify alignment with measuring instruments. Regularly lubricate moving parts and inspect jaws and mounting surfaces for wear to maintain safe, accurate clamping performance.