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Mongtec BT face mill holders

60 article numbers on BT30 · BT40 · BT50. Shell mill arbors on the BT taper, pilot Ø16 to Ø60 mm, projections from 40 to 300 mm. Mongtec Precision is a Taiwanese brand, designed and engineered in Taichung, Taiwan.

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What a face mill holder is

A shell mill or face mill has no shank — it is a body with a central bore and a drive slot, and the arbor is what carries it. The cutter slides onto a ground pilot, a drive key takes the torque, and a central screw pulls it against the arbor face.

Two dimensions decide everything. d is the pilot diameter and must match the cutter bore exactly — Ø16, 22, 27, 32, 40 or 60 mm here, the standard bore sizes. L is the projection, and it is a choice: the catalogue runs from 40 mm to 300 mm on the same pilot.

Take the shortest one that clears

Face milling is the most demanding thing you do to a holder. The cutter is wide, every insert enters and leaves the cut once per revolution, and the resulting force is both large and cyclic — exactly the excitation that finds any flexibility in the system. Deflection at the tip goes with the cube of the overhang, so doubling the projection makes the arbor roughly eight times more flexible.

The practical rule: pick the shortest L that clears the fixture and the part, and treat the 200 mm and 300 mm arbors as the answer to a reach problem, not a default. If a long arbor is unavoidable, take lighter radial cuts rather than lighter feed — it is the radial force that flexes it.

The larger sizes (FMB40 and FMB60) are catalogued with a pilot flange, listing D1 and a second thread m. The flange adds face contact at the cutter, which is what makes a wide cutter run flat rather than dishing.

Article numbers — dimensions in mm

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 usable 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.

Face Mill Holder — 48 article numbers

Article no.	d	L	D	H	M
BT30QFMB16Q40	16	40	38	17	M8
BT30QFMB22Q40	22	40	48	19	M10
BT30QFMB27Q40	27	40	58	21	M12
BT30QFMB32Q50	32	50	78	24	M16
BT40QFMB16Q40	16	40	38	17	M8
BT40QFMB22Q40	22	40	48	19	M10
BT40QFMB27Q40	27	40	58	21	M12
BT40QFMB32Q50	32	50	78	24	M16
BT40QFMB22Q60	22	60	48	19	M10
BT40QFMB27Q60	27	60	58	21	M12
BT40QFMB32Q60	32	60	78	24	M16
BT40QFMB16Q100	16	100	38	17	M8
BT40QFMB22Q100	22	100	48	19	M10
BT40QFMB27Q100	27	100	58	21	M12
BT40QFMB32Q100	32	100	78	24	M16
BT40QFMB16Q160	16	160	38	17	M8
BT40QFMB22Q160	22	160	48	19	M10
BT40QFMB27Q160	27	160	58	21	M12
BT40QFMB32Q160	32	160	78	24	M16
BT40QFMB40Q160	40	160	88	27	M20
BT40QFMB22Q200	22	200	48	19	M10
BT40QFMB27Q200	27	200	58	21	M12
BT40QFMB32Q200	32	200	78	24	M16
BT40QFMB22Q250	22	250	48	19	M10
BT40QFMB22Q300	22	300	48	19	M10
BT50QFMB16Q40	16	40	38	17	M8
BT50QFMB22Q40	22	40	48	19	M10
BT50QFMB27Q40	27	40	58	21	M12
BT50QFMB32Q50	32	50	78	24	M16
BT50QFMB22Q60	22	60	48	19	M10
BT50QFMB27Q60	27	60	58	21	M12
BT50QFMB32Q60	32	60	78	24	M16
BT50QFMB16Q100	16	100	38	17	M8
BT50QFMB22Q100	22	100	48	19	M10
BT50QFMB27Q100	27	100	58	21	M12
BT50QFMB32Q100	32	100	78	24	M16
BT50QFMB22Q160	22	160	48	19	M10
BT50QFMB27Q160	27	160	58	21	M12
BT50QFMB32Q160	32	160	78	24	M16
BT50QFMB22Q200	22	200	48	19	M10
BT50QFMB27Q200	27	200	58	21	M12
BT50QFMB32Q200	32	200	78	24	M16
BT50QFMB22Q250	22	250	48	19	M10
BT50QFMB27Q250	27	250	58	21	M12
BT50QFMB32Q250	32	250	78	24	M16
BT50QFMB22Q300	22	300	48	19	M10
BT50QFMB27Q300	27	300	58	21	M12
BT50QFMB32Q300	32	300	78	24	M16

Face Mill Holder — 12 article numbers

Article no.	d	L	D	D1	H	M	m
BT40QFMB40Q50	40	50	88	66.7	27	M20	M12
BT40QFMB40Q60	40	60	88	66.7	27	M20	M12
BT40QFMB40Q100	40	100	88	66.7	27	M20	M12
BT40QFMB40Q200	40	200	88	66.7	27	M20	M12
BT50QFMB40Q50	40	50	88	66.7	27	M20	M12
BT50QFMB40Q60	40	60	88	66.7	27	M20	M12
BT50QFMB60Q75	60	75	129	101.6	25	M30	M16
BT50QFMB40Q100	40	100	88	66.7	27	M20	M12
BT50QFMB40Q160	40	160	88	66.7	27	M20	M12
BT50QFMB40Q200	40	200	88	66.7	27	M20	M12
BT50QFMB40Q250	40	250	88	66.7	27	M20	M12
BT50QFMB40Q300	40	300	88	66.7	27	M20	M12

Source: Mongtec BT·BBT Tooling System catalogue, Ver 2026.

Check pull-stud thread and spindle standard before ordering. BT holders are supplied without pull studs, and the thread (M12, M16, M24) and stud form vary by machine builder and by region. Send Mongtec the machine make, model and the pull-stud drawing with the RFQ.

Frequently asked

Which pilot diameter do I need?

It is the bore of your cutter, not the cutter diameter. A Ø80 mm face mill commonly has a Ø27 mm bore. Check the cutter, not the catalogue picture.

Can I use a longer arbor and just slow the feed down?

Slowing the feed helps the surface finish but not the deflection, which is set by radial force and overhang. If you have to run long, reduce the radial width of cut — that is what actually lowers the force.

What is the m dimension on the FMB40 and FMB60 tables?

A second thread on the pilot flange versions, in addition to the main central screw M. Confirm the fastener specification with Mongtec at RFQ against your specific cutter.