Skip to main content
14 DAYS TO RETURN
FAST DELIVERY
BIURO@KORTOOLS.PL
789 589 582
  • 14 DAYS TO RETURN
  • FAST DELIVERY
  • BIURO@KORTOOLS.PL
  • 789 589 582
Open search engine
Search
Close search engine Clear Search
English / €
Wishlist
Products in the cart: 0. See details
Your cart is empty
New Product

BT40 / BBT40 MAS 403 hydraulic chuck Ø6–32 mm

Kortools
Availability:
Select a variant to see available quantity pcs.
with VAT without VAT
Price €168.67
(incl. 23% VAT)

Shipping costs are not included in the price.

pcs.
Ask about the product

Select a product variant:

Individual variants may differ in price

Select BT40-HY06-90 BT40-HY08-90 BT40-HY10-90 BT40-HY12-90 BT40-HY14-90 BT40-HY16-90 BT40-HY18-90 BT40-HY20-90 BT40-HY25-100 BT40-HY32-105 BT40-HY06-150 BT40-HY06-200 BT40-HY08-150 BT40-HY08-200 BT40-HY10-150 BT40-HY10-200 BT40-HY12-150 BT40-HY12-200 BT40-HY14-150 BT40-HY14-200 BT40-HY16-150 BT40-HY16-200 BT40-HY18-150 BT40-HY18-200 BT40-HY20-150 BT40-HY20-200 BT40-HY25-150 BT40-HY25-200 BT40-HY32-150 BT40-HY32-200 BBT40-HY06-90 BBT40-HY08-90 BBT40-HY10-90 BBT40-HY12-90 BBT40-HY14-90 BBT40-HY16-90 BBT40-HY18-90 BBT40-HY20-90 BBT40-HY25-100 BBT40-HY32-105 BT30-HY06-70 BT30-HY08-70 BT30-HY10-75 BT30-HY12-85 BT30-HY14-85 BT30-HY16-90 BT30-HY18-90 BT30-HY20-90
Click Available to show variants with 24h shipping


Product description

BT40 / BBT40 MAS 403 hydraulic chuck, Ø6–32 mm

Hydraulic chuck with a BT40 taper to MAS 403 BT (JIS B 6339). A cylindrical-shank tool is clamped directly in the chuck bore, without a collet: you tighten the clamping screw to the stop, and the oil in the chuck chamber expands the sleeve, which clamps the shank evenly around its full circumference (360°). The oil also dampens tool vibration. Grooves in the bore take up oil and grease residues from the shank, so the clamping surface stays dry.

A hex key for the clamping screw is needed to clamp and release the tool. No shrink fit unit or other device is required.

Available shank diameters: 6, 8, 10, 12, 14, 16, 18, 20, 25 and 32 mm. Length L = 90 mm (Ø25: 100 mm; Ø32: 105 mm) and extended versions L = 150 and 200 mm. Select the variant when purchasing.

Smaller shank diameters: a chuck Ø12, Ø20 or Ø32 can clamp a smaller tool through a hydraulic reduction sleeve (Ø12: shanks 3–8 mm; Ø20: shanks 3–16 mm; Ø32: shanks 6–25 mm). Sleeves are not included with the chuck — ask about availability.

Applications

  • clamping end mills, drills, reamers and chamfering tools with cylindrical shanks
  • precise machining: holder runout ≤ 0.003 mm, better hole accuracy in drilling and reaming, even cutting of all flutes in milling and less tool wear
  • high clamping force and rigidity around the full circumference of the shank
  • vibration damping by the oil in the chuck: smoother cutting and a better workpiece surface
  • fast tool change with a hex key, no shrink fit unit needed

Specification

Taper type BT40 (MAS 403 BT / JIS B 6339)
Tool clamping hydraulic: clamping screw and expansion sleeve with oil chamber
Tool shank diameter d 6, 8, 10, 12, 14, 16, 18, 20, 25 or 32 mm (depending on variant)
Tool shank cylindrical, diameter equal to d of the variant
Smaller shank diameters with reduction sleeves for chucks Ø12, Ø20 and Ø32 (sleeves not included)
Length L 90–200 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 stop screw with thread G in the bore (dimension table), adjustment range 10 mm
Tool clamping and release hex key for the clamping screw
Standard MAS 403 BT / JIS B 6339 (taper)

Balance grade: at least G6.3. Many hydraulic 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 hydraulic chuck Ø6–32 mm

Variant d [mm] D [mm] D1 [mm] L [mm] L1 [mm] L2 [mm] G
BT40-HY06-90 6 28 50 90 43 38 M5
BT40-HY06-150 6 28 50 150 103 38 M5
BT40-HY06-200 6 28 50 200 153 38 M5
BT40-HY08-90 8 30 50 90 44 38 M6
BT40-HY08-150 8 30 50 150 104 38 M6
BT40-HY08-200 8 30 50 200 154 38 M6
BT40-HY10-90 10 32 50 90 44 42 M8×1
BT40-HY10-150 10 32 50 150 104 42 M8×1
BT40-HY10-200 10 32 50 200 154 42 M8×1
BT40-HY12-90 12 34 50 90 44 47 M10×1
BT40-HY12-150 12 34 50 150 104 47 M10×1
BT40-HY12-200 12 34 50 200 154 47 M10×1
BT40-HY14-90 14 36 50 90 44 47 M10×1
BT40-HY14-150 14 36 50 150 104 47 M10×1
BT40-HY14-200 14 36 50 200 154 47 M10×1
BT40-HY16-90 16 38 50 90 44 50 M12×1
BT40-HY16-150 16 38 50 150 104.5 50 M12×1
BT40-HY16-200 16 38 50 200 155 50 M12×1
BT40-HY18-90 18 40 50 90 45 50 M12×1
BT40-HY18-150 18 40 50 150 104.5 50 M12×1
BT40-HY18-200 18 40 50 200 155 50 M12×1
BT40-HY20-90 20 42 50 90 45 52 M12×1
BT40-HY20-150 20 42 50 150 105 52 M16×1
BT40-HY20-200 20 42 50 200 155 52 M16×1
BT40-HY25-100 25 57 62 100 55.5 58 M16×1
BT40-HY25-150 25 57 62 150 104 58 M16×1
BT40-HY25-200 25 57 57 200 173 58 M16×1
BT40-HY32-105 32 64 62 105 62 62 M16×1
BT40-HY32-150 32 64 62 150 106 62 M16×1
BT40-HY32-200 32 64 62 200 157 62 M16×1

d – bore diameter (tool shank), D – diameter of the front clamping section, D1 – diameter of the body with the clamping screw, L – length from the flange face (spindle side) to the chuck front face, L1 – length of the front section with diameter D, L2 – bore depth from the chuck front face to the stop screw, G – thread of the stop screw for setting the tool projection (adjustment range 10 mm).

Read the complete designation of the selected variant. For example, BT40-HY12-90 means a BT40 taper, a hydraulic chuck (HY) 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 HY12). The shank must be cylindrical.
  • Check the diameters D and D1 and the lengths L and L1 in the dimension table if the tool is to work close to walls or in a deep cavity.
  • A hex key for the clamping screw is needed to clamp and release 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.

Which tools can be clamped?
Tools with a cylindrical shank whose diameter equals d of the selected variant: end mills, drills, reamers or chamfering tools. A smaller diameter can be clamped through a reduction sleeve in a chuck Ø12, Ø20 or Ø32. The bore depth L2 is given in the dimension table.

How do I clamp the tool?
Set the insertion depth with the stop screw, insert the shank into the bore and tighten the clamping screw with a hex key to the stop. To release the tool, loosen the clamping screw.

How does it differ from a shrink fit chuck?
A hydraulic chuck does not need a shrink fit unit: the tool is clamped and released with a hex key, so a tool change is quick. The oil in the chuck also dampens vibration.

How does it differ from an ER collet chuck?
A hydraulic chuck clamps the shank without a collet and nut, evenly around its full circumference, with runout ≤ 0.003 mm and vibration damping. An ER collet chuck covers different diameters by changing the collet.

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.

A tool is clamped in a BBT40 chuck in the same way as in BT40: with a hex key for the clamping screw, no shrink fit unit needed.

Taper BBT40: BT40 with flange face contact (JIS B 6339), for BIG-PLUS spindles; works like BT40 in a standard BT40 spindle
Tool clamping hydraulic: clamping screw and expansion sleeve with oil chamber
Tool shank diameter d 6, 8, 10, 12, 14, 16, 18, 20, 25 or 32 mm (depending on variant)
Tool shank cylindrical, diameter equal to d of the variant
Smaller shank diameters with reduction sleeves for chucks Ø12, Ø20 and Ø32 (sleeves not included)
Length L 90 mm (Ø25: 100 mm; Ø32: 105 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 stop screw with thread G in the bore (dimension table), adjustment range 10 mm
Tool clamping and release hex key for the clamping screw
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 hydraulic chuck

Variant d [mm] D [mm] D1 [mm] L [mm] L1 [mm] L2 [mm] G
BBT40-HY06-90 6 28 50 90 43 38 M5
BBT40-HY08-90 8 30 50 90 44 38 M6
BBT40-HY10-90 10 32 50 90 44 42 M8×1
BBT40-HY12-90 12 34 50 90 44 47 M10×1
BBT40-HY14-90 14 36 50 90 44 47 M10×1
BBT40-HY16-90 16 38 50 90 44 50 M12×1
BBT40-HY18-90 18 40 50 90 45 50 M12×1
BBT40-HY20-90 20 42 50 90 45 52 M12×1
BBT40-HY25-100 25 57 57 100 73 58 M16×1
BBT40-HY32-105 32 64 62 105 62 62 M16×1

d – bore diameter (tool shank), D – diameter of the front clamping section, D1 – diameter of the body with the clamping screw, L – length from the flange face (spindle side) to the chuck front face, L1 – length of the front section with diameter D, L2 – bore depth from the chuck front face to the stop screw, G – thread of the stop screw for setting the tool projection (adjustment range 10 mm).

Check the full designation of the selected variant. Example: BBT40-HY12-90 is a BBT40 taper, a hydraulic chuck (HY) 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-HY12-90), standard BT40 variants with BT40- (e.g. BT40-HY12-90).

Bestsellers