BT holder on CNC machining centers

Written By Ashish Kumar S

November 10, 2025

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CNC – BT holder taper on machining centers

The BT system is a more evolved version of the CAT taper (named after its developer, Caterpillar in the USA), developed by Japanese machine tool builders. The size ranges from BT30 to BT50, BT30 being the smallest. BT30 has a diameter of 31.75 mm. at the large end of the taper (dia. D2), while BT50 has a diameter of 69.85.

Here’s a related post in the blog, that has a bird’s eye view of tapers.

Pics. and text source: CADEM NCyclopedia multimedia CNC training software.

Author

Ashish Kumar S

cadem

Ashish brings strong techno-commercial depth across CNC productivity solutions, CAD/CAM systems, and skill development initiatives. As the face of CADEM’s CNC ecosystem, he drives solution adoption and market growth by aligning advanced manufacturing software with real-world production challenges. A passionate advocate of CNC education in India, he actively engages with customers and students to bridge the gap between industry needs and workforce readiness.

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