Sometimes our customers see our tool holder product names and ask us «What is BBT and BDV?»

BBT is the designation for the BIG‑PLUS® BT taper, and BDV is the designation for the BIG-PLUS® ISO69871 taper. Conventional steep taper tool holders are supported on a reference diameter called the gage line. BIG‑PLUS® tool holders are supported on the flange face, which brings remarkable improvement to rigidity.

BIG‑PLUS® and their corresponding standard tapers are reverse compatible, meaning they can be used on existing standard machine spindles. However, simultaneous contact cannot be attained with conventional spindles. 

Visit the BIG-PLUS®: The Original Brochure if you would like to learn more about this topic.