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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.
|
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 |
Tabular list 
| Art | Photo | Name | Price | Availability | Order, pcs. |
|---|---|---|---|---|---|
| 1168 | BT30 1-1/2-18UNF Boring head shank | 35 | + | ||
| 838 | BT30 ER25-100 Collet holder | 24 | + | ||
| 839 | BT30 ER25-150 Collet holder | 24 | + | ||
| 1989 | BT30-ER16-100L-D Collet holder | 24 | + | ||
| 1990 | BT30-ER16-70L-D Collet holder | 24 | + | ||
| 1991 | BT30-ER20-100L-D Collet holder | 24 | + | ||
| 1992 | BT30-ER20-70L-D Collet holder | 24 | + | ||
| 1993 | BT30-ER25-70L-D Collet holder | 24 | + | ||
| 1994 | BT30-ER32-100L-D Collet holder | 24 | + | ||
| 2935 | BT30-ER32-70L-D Collet holder | 24 | - | ||
| 1726 | BT30-ER40-80 Collet holder | 31 | + | ||
| 1389 | BT30-FMB22 Milling cutter arbor | 25 | + | ||
| 1740 | BT30-FMB22-100 Milling cutter arbor | 25 | + | ||
| 1750 | BT30-FMB22-45 Milling cutter arbor | 25 | + | ||
| 1741 | BT30-FMB22-60 Milling cutter arbor | 25 | + | ||
| 2453 | BT30-FMB27-100 Milling cutter arbor | 25 | + | ||
| 1390 | BT30-FMB27-45 Milling cutter arbor | 25 | + | ||
| 1742 | BT30-FMB27-60 Milling cutter arbor | 25 | + | ||
| 1749 | BT30-FMB32-100 Milling cutter arbor | 25 | + | ||
| 2817 | BT30-FMB32-45 Face Milling Tool Holder | 25 | + | ||
| 1391 | BT30-FMB32-60 Milling cutter arbor | 25 | + |
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