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Long drill bits for vertical mills7/7/2023 ![]() ![]() They’re an important topic and I frequently get questions about them. Over the years, we’ve written a lot of articles about tool holders for milling machines. Other Spindle Tapers not often seen on CNC machines include Jacobs, Jarno, and Morse. The R8 Taper was originally designed by Bridgeport for use in its machine tools. Like CAT, ISO are V-Flange tapers with metric dimensions as required for European use. In many ways, HSK is the most modern tool holder for machine tools. High spindle speeds create centrifugal force that actually strengthens HSK clamping. Fingers inside the hollow shank of the tool holder clamp the holder by pushing out and deforming it. HSK tool holders are designed from the start for use in high spindle speed applications, and particularly for high speed machining. HSK is the most widely used tool holders for machine tools in Germany. HSK stands for “Holschefte-Kegel” which means hollow shank taper in German. BBT tool holders are held in place by a pull stud or retention knob. It is a “Dual Contact Taper,” meaning that the shank contacts the spindle taper and the spindle face simultaneously. BBT TaperīBT is a spindle taper developed by Big Daishowa Seiki to provide improved rigidity and grip versus BT. Common sizes for CAT are CAT40 and CAT50. CAT tool holders are held in place by a pull stud or retention knob. CAT is the most widely used taper in the US. ![]() CAT TaperĬAT is a similar taper to BT–both a V-Flange Tapers. BT tool holders are held in place by a pull stud or retention knob. BT is the most widely used taper for machine tools in Japan. BT comes in sizes such as BT30, BT40, and BT50. BT TaperīT stands for “Bottle Grip Taper”. Tool Holders are largely identified by the Spindle Taper they’re designed for and the Tool Holder Type (e.g. ![]()
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