The Omega BT40 Slim Shrink Fit Chuck is a compact, high-precision toolholder designed for tight‑access milling and demanding high‑speed machining. It’s ideal for engineers, machinists, and workshop environments that need repeatable clamping and quick, reliable tool changes in limited space.

Manufactured to BT MAS403 (JIS 6339) standards, this chuck features a 3‑degree taper and Form AD/B for optimal balance and rigidity. It’s balanced to G2.5 at 25,000 RPM, delivering stable performance with a 20 mm clamping diameter and a 160 mm gauge length for consistent results in busy production settings.

• Slim, compact design for easy access: Its streamlined profile fits into crowded machines and tight work envelopes, enabling faster setups and less interference with neighboring tooling and fixtures.
• Rigid shrink-fit hold (3° taper & Form AD/B): Provides a strong, repeatable grip that maintains accuracy under load, improving part quality and extending tool life.
• High-speed balance for 25,000 RPM: Precisely balanced to G2.5 at 25,000 RPM to reduce vibration and deliver stable, precise performance with small-diameter tooling.

This combination of a compact form factor, proven rigidity, and high-speed stability helps you reduce setup time, maintain tight runout, and achieve consistent results across demanding milling operations. With a reliable 20 mm clamping diameter and 160 mm gauge length, you gain dependable toolholding that supports efficient workflows and durable performance in high‑throughput environments.