JIS B 6339 | BT15/30/40/50

The steep taper is a standard and also classic taper for automatic tool change in machining centers and is mostly used in milling machines. Manual operation is also possible. For the automatic tool change the steep taper is clamped together with a pull stud in the machine spindle. The advantage of this taper is the fact that it centers itself. All steep tapers are provided in Form AD unless otherwise noted. High-frequency tool holders are all fine balanced to G2.5, 30000rpm ~ 12000 rpm.
General rotation speed limits for JIS steep tapers:


(The rpm limits were recommended as guideline values. No liability can be accepted for these specifications. HSC-operations only under optimal machining conditions, i.e rigid machines, sufficient coolant supply, rigid workpiece and tool clamping are highly recommended. Depending on the tool, it may be necessary for these maximum speeds to balance the tool holder and the tool together.)

BT | JIS B 6339 Taper Shank
BT L D1 D2 F a M d b l
15 28.4 19.05 27 11 / M6 6.5 / /
30 48.4 31.75 46 20 2 M12 12.5 16.1 16.3
40 65.4 44.45 63 25 2 M16 17 16.1 22.6
50 101.8 69.85 100 35 3 M24 25 25.7 35.4
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