Omega's BT40 Slim Shrink Fit Chuck is a compact, high-precision toolholder designed for BT40 spindles. Its slim profile and tight tolerances deliver repeatable, rigid clamping for a wide range of milling operations, from precision features to aggressive roughing.

Engineered to BT MAS403 (JIS 6339) standards and balanced to G2.5 at 25,000 RPM, this chuck maintains stability at high speeds with a 3-degree taper and Form AD/B for a strong grip and minimal runout. The 14 mm clamping diameter and 90 mm gauge length maximize accessibility and compatibility with common tooling.

• Slim, accessible design for tight workspaces: Its compact profile improves accessibility in crowded machine envelopes, enabling faster tool changes and better reach to short tooling and pockets.
• Precision balance at 25,000 RPM: Form AD/B, a 3-degree taper, and G2.5 balance deliver low vibration, reduced runout, and consistent cutting performance at high speeds.
• Strong, repeatable clamping with standard compliance: Manufactured to BT MAS403 (JIS 6339) with a 14 mm clamping diameter and 90 mm gauge length for a reliable grip and long service life across production runs.

This combination helps you streamline setups, reduce downtime, and achieve consistent accuracy across jobs. The slim design, high-speed stability, and proven clamping deliver cleaner finishes, longer tool life, and dependable performance in demanding milling tasks. Whether you’re an engineer, machine operator, or shop buyer, you’ll gain confidence from predictable results and faster, more efficient workflows.