A face mill arbor carries a shell-type cutter on a short pilot with a drive key, held by a central screw. The dimensions that matter are d (the pilot diameter, which must match the cutter bore) and L (the projection, which sets how far the cutter stands off the spindle). Pick the shortest L that clears the fixture — every extra millimetre of projection costs stiffness on a cutter that is already taking a wide bite.
Everything else on this page converts one interface into another: Morse taper adapters for taper-shank drills and reamers, drill chuck holders, HSK-C sleeves, and the MOD runout-adjustable flange adapters.
The honest caveat on all of them: every adapter adds a joint, and every joint costs rigidity and adds run-out. An adapter is the right answer when you need a tool you already own on a spindle it was not made for, or when the alternative is buying a whole second tool crib. It is the wrong answer as a permanent solution for a production job — there, an integral holder in the right taper pays for itself.
The MOD flange adapters are the exception worth knowing about: they are run-out adjustable, so the joint they add can be dialled back in rather than simply accepted.
Dimension symbols are the catalogue's own and refer to the dimension drawing printed for each product. A dash means the catalogue does not print a value for that cell; those are confirmed in writing at RFQ. Where a table's printed header disagrees with its drawing, a note above the table says so.
| Article no. | d | L | D | H | M |
|---|---|---|---|---|---|
| BBT40QFMB16Q40 | 16 | 40 | 38 | 17 | M8 |
| BBT40QFMB22Q40 | 22 | 40 | 48 | 19 | M10 |
| BBT40QFMB27Q40 | 27 | 40 | 58 | 21 | M12 |
| BBT40QFMB32Q50 | 32 | 50 | 78 | 24 | M16 |
| BBT40QFMB22Q60 | 22 | 60 | 48 | 19 | M10 |
| BBT40QFMB27Q60 | 27 | 60 | 58 | 21 | M12 |
| BBT40QFMB32Q60 | 32 | 60 | 78 | 24 | M16 |
| BBT40QFMB16Q100 | 16 | 100 | 38 | 17 | M8 |
| BBT40QFMB22Q100 | 22 | 100 | 48 | 19 | M10 |
| BBT40QFMB27Q100 | 27 | 100 | 58 | 21 | M12 |
| BBT40QFMB32Q100 | 32 | 100 | 78 | 24 | M16 |
| BBT50QFMB16Q40 | 16 | 40 | 38 | 17 | M8 |
| BBT50QFMB22Q40 | 22 | 40 | 48 | 19 | M10 |
| BBT50QFMB27Q40 | 27 | 40 | 58 | 21 | M12 |
| BBT50QFMB32Q50 | 32 | 50 | 78 | 24 | M16 |
| BBT50QFMB22Q60 | 22 | 60 | 48 | 19 | M10 |
| BBT50QFMB27Q60 | 27 | 60 | 58 | 21 | M12 |
| BBT50QFMB32Q60 | 32 | 60 | 78 | 24 | M16 |
| BBT50QFMB16Q100 | 16 | 100 | 38 | 17 | M8 |
| BBT50QFMB22Q100 | 22 | 100 | 48 | 19 | M10 |
| BBT50QFMB27Q100 | 27 | 100 | 58 | 21 | M12 |
| BBT50QFMB32Q100 | 32 | 100 | 78 | 24 | M16 |
| BBT50QFMB22Q160 | 22 | 160 | 48 | 19 | M10 |
| BBT50QFMB27Q160 | 27 | 160 | 58 | 21 | M12 |
| BBT50QFMB32Q160 | 32 | 160 | 78 | 24 | M16 |
| Article no. | d | L | D | D1 | H | M | m |
|---|---|---|---|---|---|---|---|
| BBT40QFMB40Q50 | 40 | 50 | 88 | 66.7 | 27 | M20 | M12 |
| BBT40QFMB40Q100 | 40 | 100 | 88 | 66.7 | 27 | M20 | M12 |
| BBT50QFMB40Q50 | 40 | 50 | 88 | 66.7 | 27 | M20 | M12 |
| BBT50QFMB40Q100 | 40 | 100 | 88 | 66.7 | 27 | M20 | M12 |
| Article no. | MT.NO. | D | L |
|---|---|---|---|
| BBT40QMTA1Q50 | 1 | 25 | 50 |
| BBT40QMTA2Q50 | 2 | 32 | 50 |
| BBT40QMTA3Q70 | 3 | 40 | 70 |
| BBT40QMTA4Q95 | 4 | 48 | 95 |
| BBT50QMTA1Q45 | 1 | 25 | 45 |
| BBT50QMTA2Q60 | 2 | 32 | 60 |
| BBT50QMTA3Q65 | 3 | 40 | 65 |
| BBT50QMTA4Q95 | 4 | 48 | 95 |
| Article no. | D | D1 | L | L1 | Capacity |
|---|---|---|---|---|---|
| BBT40QCPU10Q80 | 38 | 50 | 80 | 21 | 1-10 |
| BBT40QCPU13Q90 | 50 | - | 90 | - | 1-13 |
| BBT40QCPU16Q90 | 50 | - | 90 | - | 1-16 |
| BBT50QCPU13Q100 | 50 | - | 100 | - | 1-13 |
| BBT50QCPU16Q100 | 50 | - | 100 | - | 1-16 |
| Article no. | D | D1 | D2 | L | G | G1 |
|---|---|---|---|---|---|---|
| BBT40QMOD060Q050 | 60 | 30 | 44 | 50 | M5 | M8x1 |
| BBT40QMOD070Q050 | 70 | 35 | 53 | 50 | M6 | M8x1 |
| BBT40QMOD080Q050 | 80 | 40 | 63 | 50 | M6 | M8x1 |
| BBT40QMOD100Q070 | 100 | 50 | 79 | 70 | M8 | M10x1 |
| BBT50QMOD060Q070 | 60 | 30 | 44 | 70 | M5 | M8x1 |
| BBT50QMOD070Q070 | 70 | 35 | 53 | 70 | M6 | M8x1 |
| BBT50QMOD080Q070 | 80 | 40 | 63 | 70 | M6 | M8x1 |
| BBT50QMOD100Q070 | 100 | 50 | 79 | 70 | M8 | M10x1 |
| BBT50QMOD117Q080 | 117 | 60 | 96 | 80 | M8 | M10x1 |
| BBT50QMOD140Q080 | 140 | 80 | 119 | 80 | M10 | M10x1 |
| Article no. | D1 | D2 | L |
|---|---|---|---|
| BBT40QHSK63CQ70 | 63 | 70 | 70 |
| BBT50QHSK63CQ60 | 63 | 70 | 60 |
| BBT50QHSK100CQ90 | 100 | 110 | 90 |
Source: Mongtec BT·BBT Tooling System catalogue, Ver 2026.
It depends on the adapter and the fit, and Mongtec does not publish a blanket figure. The MOD flange adapters are adjustable so run-out can be corrected after assembly; the fixed adapters cannot be. Ask for the figure for your specific combination at RFQ.
Physically often yes, and it is almost always a bad idea — the errors add and the stiffness drops twice. If you find yourself stacking, the right fix is a single purpose-made holder.
It lets an HSK-C shank tool run in a BBT spindle. Useful for using existing HSK tooling on a BT machine, with the usual adapter caveats about rigidity.