Mongtec Precision, a Taiwanese tooling brand headquartered in Taichung, Taiwan, supplies driven tool holders and static tooling for the Nakamura-Tome WT-250 on the open machine-side BMT and VDI (DIN 69880) standards. The turret interface for this model is confirmed per machine configuration by Mongtec engineering at RFQ, and every driven unit ships with an individual inspection report.
| Machine brand | Nakamura-Tome |
|---|---|
| Model | WT-250 |
| Turret interface | VDI40 or a Nakamura bolt-pattern turret (published in a machine-specific tooling catalogue by a driven tool holder manufacturer; confirmed against the actual turret drawing at RFQ) |
| Driven tool line speed | 6,000–12,000 rpm standard (up to 32,000 rpm with speed increaser) |
| Max torque | Up to 160 Nm (line capability; unit rating confirmed at RFQ) |
| Coolant | Internal / external, up to 100 bar |
| Runout | ≤0.003 mm (0° axial driven line) |
| Quality assurance | Each driven unit ships with an individual inspection report |
Nakamura-Tome turret rule: the BMT44, BMT55 and BMT65 turrets on Nakamura machines are Nakamura-specific designs — standard catalogue BMT holders do not fit them. Mongtec supplies holders to the Nakamura interface and supplies them regularly. Where a Nakamura machine carries a VDI40 turret, standard VDI40 applies.
TOOL HOLDER SELECTION GUIDE Ver 2026.08 (PDF, 2.6 MB)
Models listed in this catalogue section: BOLT HOLE PATTERN - 60 × 50 mm / WT150, 250 / WT150II, 250II / WTW150 / WTS150 / SUPER NTM3 / / SUPER NTJ / SUPER NTJX / SC150, 200, 250 / NTY3 250 / / TW10M, MY, MM, MMY, MMYY / / TW20M, MY, MM, MMY, MMYY (16 ST) / / WY250 / AS200 (15, 24 ST)
| Article no. | Tool clamping |
|---|---|
| M98584 | 20 |
| M38185 | 25 |
| M90385 | 20 |
| M28584 | 25 |
| M59784 | 20 |
| M68584 | Ø25 |
| M38584 | Ø32 |
| M21385 | Ø40 |
| M77185 | Ø40 |
| M80485 | Ø40 |
| M31385 | SH32 |
| M2417 | ER25 1-16 |
| M3417 | ER25 1-16 |
Article numbers with a specification page on this site: M0407, M2007, M3307, M6007, M7001, M7014, M8007, M8307, M9407
Mongtec also supplies BMT40, BMT60, BMT68 and BMT80 holders and builder-specific interfaces (Mazak, Nakamura-Tome, Haas BOT, Okuma BOT, Muratec BOT) — the 228 article numbers published here are a subset of the range. Mongtec tooling is exported to five continents and supplied to machine-tool builders. Lead time is confirmed per item and quantity at quotation.
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See all Nakamura-Tome models →
Mongtec supplies BMT and VDI (DIN 69880) driven tool holders and static tooling compatible with the Nakamura-Tome turret platform. Interface: VDI40 or a Nakamura bolt-pattern turret. The exact configuration is confirmed by Mongtec engineering at RFQ.
Yes. BMT and VDI are open machine-side standards, so switching supplier does not require any turret modification. Mongtec also publishes cross-reference pages for WTO, Heimatec, EWS, Eppinger, BIG and other brands.
Lead time is quoted per order and ships from Taichung, Taiwan. Every Mongtec driven tool holder is inspected before shipment (runout, torque, balancing) and ships with an individual inspection report.
Machine-specific tooling catalogues list this model in separate builds, and they do not take the same holder:
| Build | Turret mounting |
|---|---|
| WT-250 – VDI 40 build | VDI40 |
| WT-250 (24-station) | Nakamura bolt-pattern turret |
| WT-250 (standard) | Nakamura bolt-pattern turret |
Nakamura-Tome bolt-pattern turrets are identified by the centre distance between the mounting holes (40×55, 50×60 and 69×71 mm are all in use) rather than a plain BMT size number. How BMT bolt patterns differ by machine builder →
Send the turret drawing or the machine serial number and we confirm which build you have before quoting — request a quotation →
This machine is built with either a VDI40 turret or a Nakamura bolt-pattern BMT turret, so the answer depends on which one is in front of you.
VDI40 turret: standard VDI40 holders apply. See all 75 VDI40 article numbers → Treat them as a starting point — the turret drawing is verified before quoting.
Nakamura bolt-pattern turret: a different design from the standard BMT sizes, so catalogue BMT article numbers do not apply. Mongtec supplies to the Nakamura interface and supplies it regularly.
Mongtec driven and static tool holders are exported worldwide across five continents, and are supplied to machine tool manufacturers as well as to end users. Lead time is confirmed against the items and quantity you need.
To quote we need: the machine model and turret designation, the station count, a turret interface drawing or a clear photo of the turret face, the holder orientation (axial or radial) and the clamping or collet size you need, and the quantity. A drawing of the holder you are replacing works just as well.
Email info@mongtec.com to discuss your application and request drawings, or send an enquiry here. Mongtec engineering will confirm the fit against your turret before anything is quoted.
All 228 article numbers with full specification · How to choose a driven tool holder · PSC / ISO 26623 tooling
Machine builders regularly ship the same model with different turrets — station count, model suffix and the number of keys all change the mounting. The Hardinge Conquest H51 is BMT55 in the 12-station build and BMT45 in the 16-station build; the Okuma GENOS L300 M is VDI40, while the L300 MW/MYW uses a 65×73 mm bolt pattern. This is the single most common reason a driven tool holder arrives and will not bolt on. BMT bolt pattern reference — 38 patterns by machine builder →
Send your model and a photo of the turret face — we confirm the fit before quoting →
Whether a holder mounts is decided by the turret bolt pattern and the drive coupling, not by the machine name alone. The types below are published by Mongtec for this interface; the exact article number is confirmed against the actual turret drawing at RFQ.
VDI40 article numbers · BMT bolt pattern reference (38 patterns) · All driven tool types and turret interfaces