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BT Flange Taper (Bonsai Taper)
Also known as: JMTBA MAS-403 "BT", JIS B 6339 - 1986, JIS B6339 - 1992, ISO 7388/1 - 1983. BT-Flange was developed in Japan and is also a dual flange taper. They are also held in place by retention knobs, but the threads aremetric. BT toolholders are symmetrical about the spindle axis, while CAT toolholders are not. This gives BT toolholders greater stability & balance at higher speeds. BT & CAT look very similar & can easily be confused. The difference is in flange style & thickness.
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K
|
a [mm] |
B [mm] |
d [mm] |
D1 [mm] |
D2 [mm] |
D3 [mm] |
D4 [mm] |
D5 [mm] |
e [mm] |
f [mm] |
x [mm] |
y [mm] |
L1 [mm] |
L2 [mm] |
L3 [mm] |
M
|
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 30 | 2 | 16,1 | 8 | 31,75 | 12,5 | 56,1 | 46 | 38 | 20 | 13,6 | 4 | 8 | 48,4 | 24 | 16,3 | M12 |
| 40 | 2 | 16,1 | 10 | 44,45 | 17,0 | 75,6 | 63 | 53 | 25 | 16,6 | 5 | 10 | 65,4 | 30 | 22,6 | M16 |
| 50 | 3 | 25,7 | 15 | 69,85 | 25,0 | 119,0 | 100 | 85 | 35 | 23,2 | 7 | 15 | 101,8 | 45 | 35,4 | M24 |
Cascade with photo 
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