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BT40 MAS 403 shrink fit chuck 4.5° with coolant channels, Ø3–32 mm

Kortools

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€101.43

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BT40-SF03-80K

BT40-SF04-80K

BT40-SF05-80K

BT40-SF06-90K

BT40-SF08-90K

BT40-SF10-90K

BT40-SF12-90K

BT40-SF14-90K

BT40-SF16-90K

BT40-SF18-90K

BT40-SF20-90K

BT40-SF25-100K

BT40-SF32-100K

BT40-SF06-120K

BT40-SF06-160K

BT40-SF08-120K

BT40-SF08-160K

BT40-SF10-120K

BT40-SF10-160K

BT40-SF12-120K

BT40-SF12-160K

BT40-SF14-120K

BT40-SF14-160K

BT40-SF16-120K

BT40-SF16-160K

BT40-SF18-120K

BT40-SF18-160K

BT40-SF20-120K

BT40-SF20-160K

BT40-SF25-120K

BT40-SF25-160K

BT40-SF32-120K

BT40-SF32-160K

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Product description

BT40 MAS 403 shrink fit chuck 4.5° with coolant channels, Ø3–32 mm

Shrink fit chuck with coolant channels and a BT40 taper to MAS 403 BT (JIS B 6339) taper. A cylindrical-shank tool is clamped without a collet: the heated bore of the chuck expands, the shank is inserted to the set depth, and as the chuck cools down it clamps the shank around its full circumference. The tool is removed after heating the chuck again. The clamping section has a 4.5° angle.

Coolant channels: coolant supplied through the spindle centre exits at the front face of the chuck, next to the tool shank (face outlet). In a standard shrink fit chuck the coolant flows only through the centre, through a tool with internal coolant channels.

A shrink fit chuck requires an induction shrink fit unit: without heating, the tool cannot be inserted or removed. The shrink fit unit is not included.

Available for shank diameters Ø3–32 mm in length L = 80 mm (Ø3–5), 90 mm (Ø6–20) and 100 mm (Ø25 and Ø32), and Ø6–32 also in extended versions L = 120 and 160 mm. Select the variant when purchasing. Diameters Ø3–5 mm have no stop screw thread (G “–”): set the tool by its insertion depth.

Applications

clamping end mills, drills and reamers with cylindrical shanks, most often made of solid carbide
coolant at the tool even if the tool has no internal coolant channels: it exits at the front face of the chuck
precise machining: holder runout ≤ 0.003 mm
high tool clamping force

Specification

Taper type	BT40 (MAS 403 BT / JIS B 6339)
Tool clamping	shrink fit, clamping section angle 4.5°
Coolant	channels in the chuck, coolant exits at the front face; central supply (AD)
Tool shank diameter d	3, 4, 5, 6, 8, 10, 12, 14, 16, 18, 20, 25 or 32 mm (depending on variant)
Tool shank	cylindrical, with a diameter equal to d of the variant
Chuck diameter at the front face D	15–44 mm (depending on variant)
Length L	80–160 mm (depending on variant)
Holder runout	≤ 0.003 mm
Balance grade	at least G6.3 (many pieces are balanced to G2.5 at 25,000 rpm: ask us and we will check the label of the specific piece)
Tool projection setting	thread G for a stop screw in the bore (dimension table), adjustment range 10 mm; the smallest diameters have no thread G (“–” in the table)
Tool insertion and removal	induction shrink fit unit (not included)
Standard	MAS 403 BT / JIS B 6339 (taper)

Balance grade: at least G6.3. Many shrink fit chucks of this series are balanced to G2.5 at 25,000 rpm (more precise). If you need G2.5 for high spindle speeds, write to us before purchasing — we will check the label of the specific piece before shipping.

Coolant: AD version. If your spindle supplies coolant through the flange (form B), write to us before purchasing.

Dimension table

Dimension drawing – BT40 MAS 403 shrink fit chuck 4.5° with coolant channels, Ø3–32 mm

The photo shows a BT40 shrink fit chuck without coolant outlets; the coolant channel version has coolant outlets on the front face, as shown in the drawing.

Variant	d [mm]	D [mm]	D1 [mm]	L [mm]	L2 [mm]	L1 [mm]	G
BT40-SF03-80K	3	15	20	80	53	–	–
BT40-SF04-80K	4	15	20	80	53	–	–
BT40-SF05-80K	5	15	20	80	53	–	–
BT40-SF06-90K	6	21	27	90	63	36	M5
BT40-SF06-120K	6	21	27	120	93	36	M5
BT40-SF06-160K	6	21	32	160	133	36	M5
BT40-SF08-90K	8	21	27	90	63	36	M6
BT40-SF08-120K	8	21	27	120	93	36	M6
BT40-SF08-160K	8	21	32	160	133	36	M6
BT40-SF10-90K	10	24	31	90	63	42	M8×1
BT40-SF10-120K	10	24	32	120	93	42	M8×1
BT40-SF10-160K	10	24	34	160	133	42	M8×1
BT40-SF12-90K	12	24	31	90	63	47	M10×1
BT40-SF12-120K	12	24	32	120	93	47	M10×1
BT40-SF12-160K	12	24	34	160	133	47	M10×1
BT40-SF14-90K	14	27	34	90	63	47	M10×1
BT40-SF14-120K	14	27	34	120	93	47	M10×1
BT40-SF14-160K	14	27	42	160	133	47	M10×1
BT40-SF16-90K	16	27	34	90	63	50	M12×1
BT40-SF16-120K	16	27	34	120	93	50	M12×1
BT40-SF16-160K	16	27	42	160	133	50	M12×1
BT40-SF18-90K	18	33	40	90	63	50	M12×1
BT40-SF18-120K	18	33	42	120	93	50	M12×1
BT40-SF18-160K	18	33	51	160	133	50	M12×1
BT40-SF20-90K	20	33	40	90	63	52	M16×1
BT40-SF20-120K	20	33	42	120	93	52	M16×1
BT40-SF20-160K	20	33	51	160	133	52	M16×1
BT40-SF25-100K	25	44	53	100	73	58	M16×1
BT40-SF25-120K	25	44	53	120	93	58	M16×1
BT40-SF25-160K	25	44	53	160	133	58	M16×1
BT40-SF32-100K	32	44	53	100	73	62	M16×1
BT40-SF32-120K	32	44	53	120	93	62	M16×1
BT40-SF32-160K	32	44	60	160	133	62	M16×1

d – bore diameter (tool shank), D – chuck diameter at the front face, D1 – diameter at the base of the clamping section, L – length from the flange face (spindle side) to the chuck front face, L2 – length from the front surface of the flange to the chuck front face, L1 – maximum shank insertion depth, G – thread of the stop screw for setting the tool projection (adjustment range 10 mm), N – stop screw adjustment range (10 mm), “–” – no thread.

Read the complete designation of the selected variant. For example, BT40-SF12-90K means a BT40 taper, a shrink fit chuck (SF) with coolant channels (K) for a Ø12 mm shank and length L = 90 mm.

How to select

Check that the spindle has a BT40 interface (MAS 403 BT), not SK40.
Diameter d = tool shank diameter (e.g. an end mill with a Ø12 shank = a variant with “12” in the code). The shank must be cylindrical.
Choose the version with coolant channels if you want coolant at the tool and your spindle supplies it through the centre (AD).
An induction shrink fit unit is needed to insert and remove the tool.

FAQ

Will it fit my machine?
The holder has a BT40 taper to MAS 403 BT (JIS B 6339). Before purchasing, confirm that the standard, size and pull stud match the machine spindle requirements. BT40 and SK40 are different tapers, so the designation “40” alone is not sufficient to confirm the selection.

Do I need a shrink fit unit?
A shrink fit chuck requires an induction shrink fit unit: without heating, the tool cannot be inserted or removed. The shrink fit unit is not included.

Which tools can be clamped?
Tools with a cylindrical shank with a diameter equal to d of the selected variant, most often made of solid carbide. The insertion depth must not exceed L1 from the dimension table.

How does it differ from a standard shrink fit chuck?
It has channels through which coolant supplied through the spindle centre exits at the front face of the chuck, next to the tool. The tool clamping method (4.5° angle) and the dimensions are the same as in a standard shrink fit chuck of the same diameter and length.