Mongtec Precision, a Taiwanese tooling brand headquartered in Taichung, Taiwan, designs and engineers driven tool holders and static tooling for the Haas SL-20 - BOT on the open machine-side BMT and VDI (DIN 69880) standards. The turret interface for this model is confirmed by Mongtec engineering against the actual turret drawing at RFQ, and every driven unit ships with an individual inspection report.
| Machine brand | Haas |
|---|---|
| Model | SL-20 - BOT |
| Turret interface | BOT 45×80 mm — listed for this model in Mongtec TOOL HOLDER SELECTION GUIDE Ver 2026.08; confirmed against the actual turret drawing at quotation |
| Driven tool holders | Axial, radial, adjustable-angle, twin-output, high-speed and geared-down units |
| Static tooling | Turning, boring bar, facing, cut-off and blank holders |
| Inspection | Individual inspection report with every driven unit |
| Origin | Taiwanese brand headquartered in Taichung, Taiwan |
Haas turret rule: ST-10/15/20/25/30/35 base models and the SS versions use a BOT bolt-on turret (bolt patterns 45×70, 45×80, 60×50.5 and 70×105 mm); Y-axis models (ST-20Y, ST-25Y, ST-30Y, ST-35Y, DS-30Y) use the BMT65 hybrid turret. The optional VDI turret is confirmed per machine.
TOOL HOLDER SELECTION GUIDE Ver 2026.08 (PDF, 2.6 MB)
Models listed in this catalogue section: BOLT PATTERN 45 × 80 MM / DS-30 (12-station hybrid turret) / SL-20,30 / TL-15,25 (BOT turret) / / TL-15,25 (12-station hybrid turret) / ST-20/25/30/35 (BOT turret) / / ST-20,25,30,35 12-station hybrid turret
| Article no. | Tool clamping | What it does on the machine |
|---|---|---|
| M2191-30 | Ø1" | |
| M86045 | Ø1 1/4" | |
| MA2440-02 | Ø1 1/2" | |
| M17045 | Ø25 | |
| M8642-03 | Ø32 | |
| M5123-03 | Ø40 | |
| M1191-30 | 1" | |
| M07835 | 25 | Facing & face grooving |
| M38145 | 1" | |
| M48145 | 25 | |
| M18145 | 1" | |
| M28145 | 25 | |
| M29145 | 1" | |
| M19145 | 25 | |
| M77145 | 1" | |
| M87145 | 25 | |
| M97145 | 1" | |
| M08145 | 25 | |
| M57145 | Ø3/4" | |
| M67145 | Ø20 | |
| M8660-02 | 1" | |
| M80245 | 25 | |
| M90245 | - | |
| M01245 | - | |
| M11245 | - |
Article numbers shown as links have a specification page with the catalogue drawing. The rest are published in the Mongtec selection guide; Mongtec confirms the final article number against your turret drawing at RFQ.
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.
Machine builders routinely ship the same model with more than one turret. These are all published, verified examples:
| Machine | What changes | Turret mounting |
|---|---|---|
| Hardinge Conquest H51 | station count | 12-station = BMT55 · 16-station = BMT45 |
| Okuma GENOS L300 | model suffix | L300 M = VDI40 · L300 MW/MYW = 65×73 bolt pattern |
| DMG MORI ALC / ALX 1500–2500 | turret build | BMT40 or BMT42/64 |
| Takisawa TS-3000 / 4000 | key count | 2-key and 3-key turrets are not interchangeable |
It is the most common reason a driven tool holder arrives and will not bolt on. Reference table: 38 BMT turret bolt patterns by machine builder →
Send the machine model and a photo of the turret face — we confirm the fit before quoting →
Mongtec lists the Haas SL-20 - BOT under the BOT 45×80 mm turret interface in its TOOL HOLDER SELECTION GUIDE catalogue (Ver 2026.08). Because the same model can be delivered with different turrets, Mongtec engineering confirms the interface against the actual turret drawing before quoting. That check is free.
The catalogue dimensioned drawing is published on the page of each Mongtec article number. After your enquiry Mongtec confirms compatibility with your actual spindle, turret or pull stud and gives the final article number — that check is free.
Yes. Special angles, extended reach, high-pressure internal coolant and non-standard mountings are supplied to order. Describe the operation and the machine.
Yes — Mongtec supplies driven and static tool holders for this turret. Haas BOT turrets mount the holder directly to the turret face by bolt pattern — Mongtec supplies 45 × 70, 45 × 80, 70 × 105 and 60 × 50.5 mm patterns, in both metric and inch clamping. Some Haas machines are also specified with VDI30 depending on the option chosen, so the turret should be confirmed before ordering.
Turret coverage: Haas ST-10, ST-15 · SL-20, SL-30 · SL / ST-40 · TL-15, TL-25 · DS-30 · ST-20, ST-25, ST-30, ST-35 (BOT and 12-station hybrid turrets).
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 confirms the fit against your turret before quoting.
All Haas models · Driven tool holder types and turret interfaces · Published article numbers · Static turret 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 →
The turret interface for this machine is confirmed at RFQ, so no article number is published here. These are the driven tool types Mongtec publishes — which one fits is confirmed once the turret is identified.
BMT bolt pattern reference (38 patterns) · All driven tool types and turret interfaces