Mongtec M4047 — BMT85 axial driven tool holder

M4047 is an axial driven (live) tool holder for the BMT85 turret interface, using ER50 collets, rated to 4,000 rpm and 210 Nm. Mongtec Precision is a Taiwanese brand, designed and engineered in Taichung, Taiwan.

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Specification

Article numberM4047
Turret interfaceBMT85 — BMT (Base Mount Turret, flange mount)
ConfigurationAxial Tool Holders-b85
OrientationAxial
Collet systemER50
Drive ratio1:1
Max spindle speed4,000 rpm
Max torque210 Nm
BrandMongtec Precision Inc. — Taiwanese brand, designed and engineered in Taichung, Taiwan

Source: Mongtec VDI & BMT Driven Tools catalogue, Ver 2026.07.

Mongtec BMT driven (live) tool holder with ER collet chuck and internal coolant port
Mongtec BMT driven (live) tool holder with ER collet chuck and internal coolant port
Mongtec BMT axial driven tool holder with ER collet nut, front view
Mongtec BMT axial driven tool holder with ER collet nut, front view

Representative photographs of Mongtec driven tooling in this class — production units, not renderings. Shown as examples of the BMT85 family, not as a photograph of M4047 itself.

What M4047 does on the machine

The driven spindle points along the Z axis, parallel to the lathe spindle. This is the configuration for face drilling, face tapping and end milling on the part face.

Gear ratio 1:1 — tool spindle speed equals turret drive speed. The direct relationship makes speeds and feeds straightforward to calculate from the machine's live-tool rating.

Do not order against the label alone. “BMT85” identifies the nominal turret class, but BMT is an industry de-facto standard — it is not published by ISO or DIN. Bolt circle, key position and drive coupling can differ between machine builders at the same nominal size. Send Mongtec your machine model and a photograph of the turret face — engineering checks M4047 against the actual turret drawing before anything is quoted. That check is free and takes one email.

Other BMT85 holders in the same configuration

Article no.ColletRatioMax speedTorque
M0047ER501:14000 rpm210 Nm
M7047ER501:14000 rpm210 Nm
M5047ER501:14000 rpm210 Nm

Frequently asked

What machines does the Mongtec M4047 fit?

M4047 is built for the BMT85 turret interface. Because BMT is an industry de-facto standard rather than an ISO or DIN published standard, bolt circle, key position and drive coupling can differ between machine builders even at the same nominal size. Send Mongtec your machine model and a photo of the turret face and engineering confirms the fit before anything is quoted.

What speed and torque can M4047 run?

M4047 is rated to 4,000 rpm with 210 Nm of torque at a 1:1 drive ratio. The usable figure is whichever is lower: this rating or your machine's live-tool drive rating.

What collet does M4047 take?

M4047 takes ER50 collets. Collets and nuts are supplied separately; specify the shank diameters you intend to run and Mongtec quotes the collet set with the holder.

Is a dimensioned drawing available for M4047?

Yes. Mongtec supplies the full dimensioned drawing for M4047 by email once an enquiry is open, so the drawing is matched to your actual machine and turret configuration rather than a generic sheet.

Get M4047 quoted

Send the machine model, the turret station you want to use and the tools you intend to run. Anything you do not know, Mongtec works out from the machine model — an incomplete enquiry is still worth sending. Dimensioned drawings for M4047 are supplied by email once the enquiry is open.

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All BMT85 article numbers · How to choose a driven tool holder · All turret interfaces