New Product

SK40 DIN 69871 hydraulic chuck Ø6–32 mm

Kortools

Availability:

Select a variant to see available quantity pcs.

€168.67

Shipping costs are not included in the price.

Quantity

pcs.

Ask about the product

Select a product variant:

Individual variants may differ in price

Size

Select

SK40-HY06-65

SK40-HY08-65

SK40-HY10-65

SK40-HY12-65

SK40-HY14-80.5

SK40-HY16-65

SK40-HY20-65

SK40-HY25-80.5

SK40-HY32-80.5

SK40-HY06-80.5

SK40-HY06-110

SK40-HY08-80.5

SK40-HY08-110

SK40-HY10-80.5

SK40-HY10-110

SK40-HY12-80.5

SK40-HY12-110

SK40-HY16-80.5

SK40-HY16-110

SK40-HY20-80.5

SK40-HY20-110

SK30-HY06-70

SK30-HY08-70

SK30-HY10-75

SK30-HY12-85

SK30-HY14-85

SK30-HY16-90

SK30-HY18-90

SK30-HY20-90

Click Available to show variants with 24h shipping

Product description

SK40 DIN 69871 hydraulic chuck, Ø6–32 mm

Hydraulic chuck with an SK40 taper to DIN 69871. 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, 20, 25 and 32 mm. Length L = 65, 80.5 and 110 mm; Ø14, Ø25 and Ø32: 80.5 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	SK40 (DIN 69871)
Tool clamping	hydraulic: clamping screw and expansion sleeve with oil chamber
Tool shank diameter d	6, 8, 10, 12, 14, 16, 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	65, 80.5 or 110 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 or AD/B version, depending on the batch (central coolant supply; AD/B also through the flange)
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	DIN 69871 (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 or AD/B version, depending on the batch. If your spindle supplies coolant through the flange (form B), write to us before purchasing.

Dimension table

Dimension drawing – SK40 DIN 69871 hydraulic chuck Ø6–32 mm

Variant	d [mm]	D [mm]	D1 [mm]	L [mm]	L1 [mm]	L2 [mm]	G
SK40-HY06-65	6	28	50	65	26	38	M5
SK40-HY06-80.5	6	28	45	80.5	42	38	M5
SK40-HY06-110	6	28	45	110	71.5	38	M5
SK40-HY08-65	8	30	50	65	26	38	M6
SK40-HY08-80.5	8	30	45	80.5	42.5	38	M6
SK40-HY08-110	8	30	45	110	71.5	38	M6
SK40-HY10-65	10	32	50	65	26	42	M8×1
SK40-HY10-80.5	10	32	45	80.5	43	42	M8×1
SK40-HY10-110	10	32	45	110	72	42	M8×1
SK40-HY12-65	12	34	47.5	65	34	47	M10×1
SK40-HY12-80.5	12	34	45	80.5	43	47	M10×1
SK40-HY12-110	12	34	45	110	72.5	47	M10×1
SK40-HY14-80.5	14	36	45	80.5	43	47	M10×1
SK40-HY16-65	16	38	49.2	65	36	50	M12×1
SK40-HY16-80.5	16	38	50	80.5	43	50	M12×1
SK40-HY16-110	16	38	50	110	72	50	M12×1
SK40-HY20-65	20	42	49.4	65	38	52	M16×1
SK40-HY20-80.5	20	42	49	80.5	44	52	M12×1
SK40-HY20-110	20	42	50	110	73	52	M16×1
SK40-HY25-80.5	25	57	68	80.5	26	58	M16×1
SK40-HY32-80.5	32	64	80	80.5	23	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, SK40-HY12-65 means an SK40 taper, a hydraulic chuck (HY) for a Ø12 mm shank and length L = 65 mm.

How to select

Check that the spindle has an SK40 interface (DIN 69871), not BT40.
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 an SK40 taper to DIN 69871. Before purchasing, confirm that the standard, size and pull stud match the machine spindle requirements. SK40 and BT40 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.