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

A Weldon end mill holder clamps Weldon-flat (DIN 1835-B) cutter shanks with a side-lock screw. PTP makes them with a BT shank (MAS 403 / JIS B6339, ISO 7388-2 type J) in BT30, BT40 and BT50: bores Ø6–50 mm, gauge lengths 50–125 mm, 31 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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Weldon End Mill Holders, BT shank: technical drawing with dimensions — Weldon End Mill Holders with a BT shank, from the PTP catalogue. Click to open it full size.

All 31 BT Weldon end mill holders

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

BT30 Weldon end mill holders: 8 ordering codes

Ordering code	Bore Ø (d)	Gauge Length (GPL)	C	Screw Thread	L
47BT30WE0660	6 mm	60 mm	25 mm	M6	18 mm
47BT30WE0860	8 mm	60 mm	28 mm	M8	18 mm
47BT30WE1060	10 mm	60 mm	35 mm	M10	20 mm
47BT30WE1260	12 mm	60 mm	42 mm	M12	22.5 mm
47BT30WE1460	14 mm	60 mm	44 mm	M12	22.5 mm
47BT30WE1660	16 mm	60 mm	48 mm	M14	24 mm
47BT30WE1860	18 mm	60 mm	50 mm	M14	24 mm
47BT30WE2075	20 mm	75 mm	52 mm	M16	25 mm

BT40 Weldon end mill holders: 11 ordering codes

Ordering code	Bore Ø (d)	Gauge Length (GPL)	C	Screw Thread	L	L1
47BT40WE0650	6 mm	50 mm	25 mm	M6	18 mm	–
47BT40WE0850	8 mm	50 mm	28 mm	M8	18 mm	–
47BT40WE1063	10 mm	63 mm	35 mm	M10	20 mm	–
47BT40WE1263	12 mm	63 mm	42 mm	M12	22.5 mm	–
47BT40WE1463	14 mm	63 mm	44 mm	M12	22.5 mm	–
47BT40WE1663	16 mm	63 mm	48 mm	M14	24 mm	–
47BT40WE1863	18 mm	63 mm	50 mm	M14	24 mm	–
47BT40WE2063	20 mm	63 mm	52 mm	M16	25 mm	–
47BT40WE25100	25 mm	100 mm	65 mm	M18×2	24 mm	25 mm
47BT40WE32100	32 mm	100 mm	72 mm	M20×2	24 mm	28 mm
47BT40WE40115	40 mm	115 mm	80 mm	M20×2	30 mm	32 mm

BT50 Weldon end mill holders: 12 ordering codes

Ordering code	Bore Ø (d)	Gauge Length (GPL)	C	Screw Thread	L	L1
47BT50WE0663	6 mm	63 mm	25 mm	M6	18 mm	–
47BT50WE0863	8 mm	63 mm	28 mm	M8	18 mm	–
47BT50WE1080	10 mm	80 mm	35 mm	M10	20 mm	–
47BT50WE1280	12 mm	80 mm	42 mm	M12	22.5 mm	–
47BT50WE1480	14 mm	80 mm	44 mm	M12	22.5 mm	–
47BT50WE1680	16 mm	80 mm	48 mm	M14	24 mm	–
47BT50WE1880	18 mm	80 mm	50 mm	M14	24 mm	–
47BT50WE2080	20 mm	80 mm	52 mm	M16	25 mm	–
47BT50WE25100	25 mm	100 mm	65 mm	M18×2	24 mm	25 mm
47BT50WE32105	32 mm	105 mm	72 mm	M20×2	24 mm	28 mm
47BT50WE40115	40 mm	115 mm	80 mm	M20×2	30 mm	32 mm
47BT50WE50125	50 mm	125 mm	100 mm	M24×2	40 mm	40 mm

Questions about BT Weldon end mill holders

Which pull stud does a BT Weldon end 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 Weldon end mill holder?

Cutters with a DIN 1835-B (Weldon) flat on the shank, clamped by the side-lock screw (M6, M8, M10, M12, M14, M16, M18×2, M20×2 and M24×2).