The BT40 Slim Shrink Fit Chuck from Omega is a precision toolholder designed for BT40 spindles. With a slim profile, 5mm clamping diameter, and a 90mm gauge length, it delivers strong, repeatable holding in tight machining envelopes—perfect for engineers, machinists, and hobbyists who need accessibility without sacrificing rigidity. Built to BT MAS403 (JIS 6339) standards, this chuck ensures consistent performance across high-speed milling tasks. Engineered for high-speed stability, it features a 3-degree taper and Form AD/B and is perfectly balanced to G2.5 at 25,000 RPM for smooth operation and reliable results.

• Slim, accessible design: Compact profile improves tool clearance in crowded setups and enhances chip evacuation, helping you reduce setup time and keep workflows flowing.
• Rigid shrink-fit clamping: BT MAS403/JIS-standard construction delivers strong holding power with minimal runout, supporting precise geometry and better surface finishes on every cut.
• High-speed balance for precision: Form AD/B with a 3-degree taper balanced to G2.5 at 25,000 RPM provides stable, vibration-free performance for high-speed milling and consistent tool life, even with demanding tools.

With its compact footprint, proven rigidity, and high-speed stability, this BT40 Slim Shrink Fit Chuck helps you achieve tighter tolerances, smoother finishes, and faster cycle times. The reliable balance and standards compliance give you confidence in repeatable results across precision prototyping to production runs, making it a dependable upgrade for BT40 machines.