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BT40 / BBT40 MAS 403 shrink fit chuck 4.5° Ø3–32 mm

Kortools
Availability:
Select a variant to see available quantity pcs.
with VAT without VAT
Price €76.36
(incl. 23% VAT)

Shipping costs are not included in the price.

pcs.
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Select a product variant:

Individual variants may differ in price

Select BT40-SF06-90 BT40-SF06-120 BT40-SF08-90 BT40-SF08-120 BT40-SF10-90 BT40-SF10-120 BT40-SF12-90 BT40-SF12-120 BT40-SF14-90 BT40-SF16-90 BT40-SF16-120 BT40-SF18-90 BT40-SF20-90 BT40-SF20-120 BT40-SF25-100 BT40-SF32-100 BT40-SF03-80 BT40-SF03-120 BT40-SF03-160 BT40-SF04-80 BT40-SF04-120 BT40-SF04-160 BT40-SF05-80 BT40-SF05-120 BT40-SF05-160 BT40-SF06-160 BT40-SF06-200 BT40-SF08-160 BT40-SF08-200 BT40-SF10-160 BT40-SF10-200 BT40-SF12-160 BT40-SF12-200 BT40-SF14-120 BT40-SF14-160 BT40-SF14-200 BT40-SF16-160 BT40-SF16-200 BT40-SF18-120 BT40-SF18-160 BT40-SF18-200 BT40-SF20-160 BT40-SF20-200 BT40-SF25-120 BT40-SF25-160 BT40-SF25-200 BT40-SF32-120 BT40-SF32-160 BT40-SF32-200 BBT40-SF03-80 BBT40-SF04-80 BBT40-SF05-80 BBT40-SF06-90 BBT40-SF08-90 BBT40-SF10-90 BBT40-SF12-90 BBT40-SF14-90 BBT40-SF16-90 BBT40-SF18-90 BBT40-SF20-90 BBT40-SF25-100 BBT40-SF32-100 BT30-SF03-80 BT30-SF04-80 BT30-SF05-80 BT30-SF06-80 BT30-SF06-120 BT30-SF08-80 BT30-SF08-120 BT30-SF10-80 BT30-SF10-120 BT30-SF12-80 BT30-SF12-120 BT30-SF14-80 BT30-SF16-80 BT30-SF16-120 BT30-SF18-80 BT30-SF20-80 BT30-SF20-120
Click Available to show variants with 24h shipping


Product description

BT40 / BBT40 MAS 403 shrink fit chuck 4.5°, Ø3–32 mm

Shrink fit chuck with a BT40 taper to MAS 403 BT (JIS B 6339). 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.

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 from 3 to 32 mm in lengths from 80 to 200 mm, depending on the diameter: Ø3–5 up to 160 mm, Ø6–32 up to 200 mm (dimension table). Select the variant when purchasing. Diameters Ø3–5 mm have no stop screw thread (G “–” in the table).

Applications

  • clamping end mills, drills and reamers with cylindrical shanks, most often made of solid carbide
  • precise machining: holder runout ≤ 0.003 mm
  • high tool clamping force
  • machining in deep cavities: the slim clamping section reduces the risk of collision

Specification

Taper type BT40 (MAS 403 BT / JIS B 6339)
Tool clamping shrink fit, clamping section angle 4.5°
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, tolerance h6, diameter equal to d of the variant
Length L 80–200 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)
Coolant AD version (central coolant supply)
Tool projection setting thread G for a stop screw in the bore (dimension table), adjustment range 10 mm; Ø3–5 without 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 / BBT40 MAS 403 shrink fit chuck 4.5° Ø3–32 mm

Variant d [mm] D [mm] D1 [mm] L [mm] L2 [mm] L1 [mm] G
BT40-SF03-80 3 15 20 80 53 – –
BT40-SF03-120 3 15 20 120 93 – –
BT40-SF03-160 3 15 25 160 133 – –
BT40-SF04-80 4 15 20 80 53 – –
BT40-SF04-120 4 15 20 120 93 – –
BT40-SF04-160 4 15 25 160 133 – –
BT40-SF05-80 5 15 20 80 53 – –
BT40-SF05-120 5 15 20 120 93 – –
BT40-SF05-160 5 15 25 160 133 – –
BT40-SF06-90 6 21 27 90 63 36 M5
BT40-SF06-120 6 21 27 120 93 36 M5
BT40-SF06-160 6 21 32 160 133 36 M5
BT40-SF06-200 6 21 32 200 173 36 M5
BT40-SF08-90 8 21 27 90 63 36 M6
BT40-SF08-120 8 21 27 120 93 36 M6
BT40-SF08-160 8 21 32 160 133 36 M6
BT40-SF08-200 8 21 32 200 173 36 M6
BT40-SF10-90 10 24 31 90 63 42 M8×1
BT40-SF10-120 10 24 32 120 93 42 M8×1
BT40-SF10-160 10 24 34 160 133 42 M8×1
BT40-SF10-200 10 24 34 200 173 42 M8×1
BT40-SF12-90 12 24 31 90 63 47 M10×1
BT40-SF12-120 12 24 32 120 93 47 M10×1
BT40-SF12-160 12 24 34 160 133 47 M10×1
BT40-SF12-200 12 24 34 200 173 47 M10×1
BT40-SF14-90 14 27 34 90 63 47 M10×1
BT40-SF14-120 14 27 34 120 93 47 M10×1
BT40-SF14-160 14 27 42 160 133 47 M10×1
BT40-SF14-200 14 27 42 200 173 47 M10×1
BT40-SF16-90 16 27 34 90 63 50 M12×1
BT40-SF16-120 16 27 34 120 93 50 M12×1
BT40-SF16-160 16 27 42 160 133 50 M12×1
BT40-SF16-200 16 27 42 200 173 50 M12×1
BT40-SF18-90 18 33 40 90 63 50 M12×1
BT40-SF18-120 18 33 42 120 93 50 M12×1
BT40-SF18-160 18 33 51 160 133 50 M12×1
BT40-SF18-200 18 33 51 200 173 50 M12×1
BT40-SF20-90 20 33 40 90 63 52 M16×1
BT40-SF20-120 20 33 42 120 93 52 M16×1
BT40-SF20-160 20 33 51 160 133 52 M16×1
BT40-SF20-200 20 33 51 200 173 52 M16×1
BT40-SF25-100 25 44 53 100 73 58 M16×1
BT40-SF25-120 25 44 53 120 93 58 M16×1
BT40-SF25-160 25 44 53 160 133 58 M16×1
BT40-SF25-200 25 44 53 200 173 58 M16×1
BT40-SF32-100 32 44 53 100 73 62 M16×1
BT40-SF32-120 32 44 53 120 93 62 M16×1
BT40-SF32-160 32 44 60 160 133 62 M16×1
BT40-SF32-200 32 44 60 200 173 62 M16×1

d – bore diameter (tool shank), D – chuck diameter at the front face, D1 – diameter at the base of the 4.5° 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 and no L1 dimension.

Read the complete designation of the selected variant. For example, BT40-SF12-90 means a BT40 taper, a shrink fit chuck (SF) 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 = variant SF12). The shank must be cylindrical, in tolerance h6.
  • A shorter chuck gives higher rigidity, the extended one (L = 120–200 mm) gives greater reach in deep cavities.
  • 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 in tolerance h6 and 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 table.

How does it differ from an ER collet chuck?
A shrink fit chuck clamps the shank without a collet, around its full circumference, so it has low runout (≤ 0.003 mm) and a slim shape. An ER collet chuck covers different diameters by changing the collet and does not require a shrink fit unit.

BBT40 – BT40 with flange face contact (BIG-PLUS)

Variants whose code starts with BBT40- have a BBT40 taper. This is a BT40 taper to JIS B 6339 (MAS 403) with a flange face that contacts the spindle face in a BIG-PLUS spindle. The holder is then seated on the taper and on the flange face at the same time (taper and face contact). This gives a stiffer and more stable seating, especially at high spindle speeds, a repeatable position after every automatic tool change, higher machining accuracy and a better surface finish.

In a standard BT40 spindle (without BIG-PLUS) a BBT40 holder works like a standard BT40 holder: it is seated on the taper only. For such a spindle the lower-priced variant with the code BT40- in the same size is sufficient, if it is on the list.

Before purchasing, check in the machine documentation whether the spindle has the BIG-PLUS system (BBT40). The pull stud is selected in the same way as for BT40 (M16 thread), according to the spindle requirements.

The Ø3, Ø4 and Ø5 variants have length L = 80 mm and no thread for a stop screw (“–” in the table). Like BT40, a BBT40 shrink fit chuck requires an induction shrink fit unit, which is not included.

Taper BBT40: BT40 with flange face contact (JIS B 6339), for BIG-PLUS spindles; works like BT40 in a standard BT40 spindle
Tool clamping shrink fit, clamping section angle 4.5°
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, tolerance h6, diameter equal to d of the variant
Length L 90 mm (Ø3, Ø4 and Ø5: 80 mm; Ø25 and Ø32: 100 mm)
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)
Coolant AD version (central coolant supply)
Tool projection setting thread G for a stop screw in the bore (Ø6–32 mm), adjustment range 10 mm; Ø3, Ø4 and Ø5 without thread
Tool insertion and removal induction shrink fit unit (not included)
Pull stud thread M16 (as BT40)
Standard JIS B 6339 (BBT taper)

BBT40 balance grade: at least G6.3. Many BBT40 holders of this type 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.

BBT40 – dimension table

Dimension drawing – BBT40 shrink fit chuck 4.5°

Variant d [mm] D [mm] D1 [mm] L [mm] L2 [mm] L1 [mm] G
BBT40-SF03-80 3 15 20 80 53 – –
BBT40-SF04-80 4 15 20 80 53 – –
BBT40-SF05-80 5 15 20 80 53 – –
BBT40-SF06-90 6 21 27 90 63 36 M5
BBT40-SF08-90 8 21 27 90 63 36 M6
BBT40-SF10-90 10 24 31 90 63 42 M8×1
BBT40-SF12-90 12 24 31 90 63 47 M10×1
BBT40-SF14-90 14 27 34 90 63 47 M10×1
BBT40-SF16-90 16 27 34 90 63 50 M12×1
BBT40-SF18-90 18 33 40 90 63 50 M12×1
BBT40-SF20-90 20 33 40 90 63 52 M16×1
BBT40-SF25-100 25 44 53 100 73 58 M16×1
BBT40-SF32-100 32 44 53 100 73 62 M16×1

d – bore diameter (tool shank), D – chuck diameter at the front face, D1 – diameter at the base of the 4.5° 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), “–” – none (Ø3–5).

Check the full designation of the selected variant. Example: BBT40-SF12-90 is a BBT40 taper, a shrink fit chuck (SF) for a Ø12 mm shank and length L = 90 mm.

BBT40 – questions

What is the difference between BBT40 and BT40?
BBT40 has the same taper as BT40, but in a BIG-PLUS spindle it also contacts the spindle with the flange face. This taper and face contact makes the seating of the holder stiffer. A standard BT40 holder is seated on the taper only.

Does BBT40 fit a standard BT40 spindle?
Yes. In a standard BT40 spindle a BBT40 holder works like a standard BT40 holder (contact on the taper only). The benefit of the face contact is available only in a BIG-PLUS spindle.

How do I tell a BBT40 variant from a BT40 variant?
By the code: BBT40 variants start with BBT40- (e.g. BBT40-SF12-90), standard BT40 variants with BT40- (e.g. BT40-SF12-90).

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