This is the widest family Mongtec supplies — twenty-five holder types on the BT and BBT tapers, from an ER16 collet chuck through to an ATC arm alignment tool. All of it is cut to JIS B 6339 with a taper tolerance tighter than AT3.
| Taper standard | JIS B 6339 |
|---|---|
| Material | Alloyed case hardened steel |
| Surface treatment | Blackening or bright |
| Taper tolerance | Tighter than AT3 |
| Hardness | HRC 56–60 |
| Case depth | 0.8 ± 0.2 mm |
| Surface roughness | Ra below 0.2 µm |
| Balance grade | G6.3/15000 and G2.5/25000 |
| Coolant | Form AD; AD/B on request |
Mongtec publishes these numbers because they are the ones that decide whether a holder holds its accuracy after a year in a real shop. Ask for them from any supplier you compare against.
The catalogue programme with every article number and the dimensions the catalogue prints for it:
| Page | Article numbers | Covers |
|---|---|---|
| BBT collet chucks and milling chucks | 79 | ER · SKS · NDC precision screw · HC power milling |
| BBT end mill holders | 61 | Weldon side lock · coolant-channel |
| BBT face mill holders and adapters | 55 | Shell mill arbors · Morse taper · drill chuck · MOD flange · HSK-C sleeve |
| BT adapters, sleeves and special holders | 164 | MTA / MTB · APU / CPU · tapping · screw-in cutter · boring blanks · ATC gauges |
| BT collet chucks | 183 | ER UM / hex / mini / short / GER · OZ · TG · SKS · pull-back · precision screw |
| BT power milling chucks | 51 | HC power milling chucks · clamping 3 to 42 mm |
| BT end mill holders | 151 | Weldon side lock · whistle notch · screw-in milling cutter |
| BT face mill holders | 60 | Inch and metric shell mill arbors · combi shell mill |
Every BT and BBT article number in the catalogue programme is now published across these eight pages — 445 on the BT taper and 359 on the BBT taper. Where the catalogue prints a dimension we could not reconcile, the cell is left blank with a note to confirm it at RFQ rather than filled with a guess.
BT30 / BT40 / BT50 · BBT30 / BBT40 / BBT50
| ER collet chuck, UM nut | ER16 to ER50, DIN 6499, clamping 1 to 34 mm |
|---|---|
| ER collet chuck, hex nut | ER16 and ER20 |
| ER collet chuck, mini nut | ER11 to ER25, reduced nose diameter |
| ER collet chuck, short | Compact build |
| ER collet chuck, GER nut | ER16 to ER32 |
| Power milling chuck | ø20 to ø42, clamping 3 to 42 mm |
| OZ collet chuck | DIN 6391, OZ16 to OZ32 |
| TG collet chuck | TG75 and TG100 |
| High speed SKS collet chuck | SKS10 to SKS25 |
| Pull back collet chuck | Clamping 1 to 12 mm |
| Precision screw collet chuck | Clamping 4 to 32 mm |
Face mill and shell mill holders →
| Face mill holder, inch | 3/4″ to 1-1/2″ — for shops running inch arbors |
|---|---|
| Face mill holder, metric | DIN 6357, ø16 to ø60 |
| Combi shell mill holder | ø16 to ø40 |
| End mill holder, Weldon | ø6 to ø50, coolant version available (K) |
|---|---|
| End mill holder, whistle notch | ø6 to ø40 |
| Screw-in milling cutter holder | M8, M10, M12, M16 threads |
| Morse taper adapter | MT1 to MT5, tang or drawbar, DIN 6364 |
|---|---|
| Tool holder adapter sleeve | BT to BT, and BT to HSK-C from HSK32C to HSK100C |
| Drill chuck adapter | B12, B16, B18, B22 |
| Keyless drill chuck holder | Clamping 1 to 16 mm |
| Precision drill chuck holder | Clamping 1 to 16 mm |
| Quick change tapping chuck | With length compensation, M3 to M33 |
| Runout adjustable flange adapter | ø60 to ø140 |
|---|---|
| Flange adapter sleeve | Module to HSK-C |
| UM adjustable tool holder | ø12 to ø32 |
| Boring bar blank | Machine your own |
| Test arbor | ø32, ø40, ø50 × 300 mm |
| ATC arm alignment tool | For setting the tool changer arm |
| Stability at speed | The flange face and the taper both carry load, so the holder stays put at high rpm |
|---|---|
| Surface finish | Less deflection at the nose shows up directly in the finish |
| Dimensional accuracy | Repeatable position means repeatable size |
| ATC repeatability | The holder returns to the same place every change |
| Boring roundness | Better roundness on bored features |
| Tool life | Less vibration, longer edge life |
Dual contact only works if the spindle is cut for it. Mongtec supplies dual contact holders to the industry-standard geometry — confirm your spindle is a dual contact spindle before ordering.
Body diameters (D, D1), gauge lengths (L2, L1) and the set-screw thread (G) are in the printed catalogue and are supplied with the quotation.
CNC mill tool holders → · Shrink fit tool holders → · Hydraulic tool holders →