BT Face Mill Holders – BT30, BT40 and BT50 (MAS 403)

A face mill holder carries shell-type face mills on a pilot with drive keys. PTP makes them with a BT shank (MAS 403 / JIS B6339, ISO 7388-2 type J) in BT30, BT40 and BT50: cutter bores Ø16–60 mm for Ø40–250 mm face mills, gauge lengths 30–75 mm, 16 ordering codes in all. They are pulled into the spindle by MAS-BT or JIS B6339 pull studs: M12 on BT30, M16 on BT40 and M24 on BT50. Taper AT3 or better, TIR 0.005 mm max, balanced G2.5 @ 15,000 rpm.

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Face Mill Holders, BT shank: technical drawing with dimensions — Face Mill Holders with a BT shank, from the PTP catalogue. Click to open it full size.

All 16 BT face mill holders

One table per taper size. Every ordering code opens its own page with its dimensions (mm).

BT30 face mill holders: 3 ordering codes

Ordering code	Cutter Bore Ø (d)	Gauge Length (GPL)	C	H	Cutter Ø	L
47BT30FMH1630	16 mm	30 mm	34 mm	17 mm	40 mm	17 mm
47BT30FMH2230	22 mm	30 mm	45 mm	19 mm	50, 63 mm	19 mm
47BT30FMH2745	27 mm	45 mm	58 mm	21 mm	80 mm	21 mm

BT40 face mill holders: 6 ordering codes

Ordering code	Cutter Bore Ø (d)	Gauge Length (GPL)	C	H	Cutter Ø	L	PCD
47BT40FMH1645	16 mm	45 mm	34 mm	17 mm	40 mm	17 mm	–
47BT40FMH2245	22 mm	45 mm	45 mm	19 mm	50, 63 mm	19 mm	–
47BT40FMH2745	27 mm	45 mm	58 mm	21 mm	80 mm	21 mm	–
47BT40FMH3260	32 mm	60 mm	78 mm	24 mm	100 mm	24 mm	–
47BT40FMH4060	40 mm	60 mm	88 mm	27 mm	125, 160 mm	27 mm	–
47BT40FMH40F60	40F	60 mm	88 mm	27 mm	125, 160 mm	27 mm	66.7 mm

BT50 face mill holders: 7 ordering codes

Ordering code	Cutter Bore Ø (d)	Gauge Length (GPL)	C	H	Cutter Ø	L	PCD
47BT50FMH1660	16 mm	60 mm	34 mm	17 mm	40 mm	17 mm	–
47BT50FMH2260	22 mm	60 mm	45 mm	19 mm	50, 63 mm	19 mm	–
47BT50FMH2760	27 mm	60 mm	58 mm	21 mm	80 mm	21 mm	–
47BT50FMH3260	32 mm	60 mm	78 mm	24 mm	100 mm	24 mm	–
47BT50FMH4060	40 mm	60 mm	88 mm	27 mm	125, 160 mm	27 mm	–
47BT50FMH40F60	40F	60 mm	88 mm	27 mm	125, 160 mm	27 mm	66.7 mm
47BT50FMH6075	60 mm	75 mm	128 mm	27 mm	250 mm	27 mm	101.6 mm

Questions about BT face mill holders

Which pull stud does a BT face mill holder take?

The pull stud of its taper size: M12 on BT30, M16 on BT40 and M24 on BT50. Use a MAS-BT pull stud with the head angle your drawbar takes (45°, 60° or 90°), or a JIS B6339 stud with a 15° head (BT40 and BT50).

BT30 pull studs BT40 pull studs BT50 pull studs

What goes with a BT face mill holder?

A shell-type face mill whose bore matches the arbor: Ø16 mm for Ø40 mm, Ø22 mm for Ø50 and 63 mm, Ø27 mm for Ø80 mm, Ø32 mm for Ø100 mm, Ø40 mm for Ø125 and 160 mm and Ø60 mm for Ø250 mm cutters.