Omega BT40 Slim Shrink Fit Chuck is a compact, high-precision toolholder designed for BT40 spindles. Its slim profile improves accessibility in tight work envelopes while delivering strong, repeatable clamping for reliable machining at speed. Manufactured to BT MAS403 (JIS 6339) standards, this chuck combines rigidity and precision with a balanced, smooth operation up to 25,000 RPM.

With a 12 mm clamping diameter and a 90 mm gauge length, it seats tools consistently and securely, helping maintain tight runout and repeatable results across demanding milling and finishing tasks.

• Slim BT40 shrink-fit design: Compact form improves accessibility in tight machines while delivering a strong, repeatable grip that minimizes runout and chatter.
• BT MAS403 (JIS 6339) compliant with Form AD/B: Industry-standard precision and seating accuracy, ensuring reliable clamping and straightforward interchangeability with compatible tooling.
• Optimized high‑speed balance for 25,000 RPM: 3-degree taper with Form AD/B and G2.5 balance deliver stable, smooth operation at top speeds, while the 12 mm clamping diameter and 90 mm gauge length support consistent seating.

This chuck helps you streamline workflows by delivering secure, repeatable tool holding at high speeds. The slim profile eases setup in crowded spindle areas, while its standards-compliant construction and precise balance minimize runout and vibration—leading to better surface finishes, fewer reworks, and more productive machining sessions.