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SK40 DIN 69871 Weldon holder with coolant channels Ø6–40 mm

Kortools

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€47.87

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SK40-SLA06-50K

SK40-SLA08-50K

SK40-SLA10-50K

SK40-SLA12-50K

SK40-SLA14-50K

SK40-SLA16-63K

SK40-SLA18-63K

SK40-SLA20-63K

SK40-SLA25-100K

SK40-SLA32-100K

SK40-SLA40-120K

SK40-SLA06-100K

SK40-SLA08-100K

SK40-SLA10-100K

SK40-SLA12-100K

SK40-SLA14-100K

SK40-SLA16-100K

SK40-SLA18-100K

SK40-SLA20-100K

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Product description

SK40 DIN 69871 Weldon holder with coolant channels, Ø6–40 mm

Weldon (side-lock) milling holder with an SK40 (DIN 69871) taper and coolant channels. The tool is clamped by the side flat of the shank (Weldon, DIN 1835 B) and a clamping screw, so the cutter does not rotate in the holder even in heavy milling. Coolant supplied through the spindle centre flows through channels to the front face of the holder, around the tool, and reaches the cutting zone even when the tool has no internal coolant channels.

Available bore diameters: 6, 8, 10, 12, 14, 16, 18, 20, 25, 32 and 40 mm. Length L = 50 mm (Ø6–14), 63 mm (Ø16–20), 100 mm (Ø6–32) and 120 mm (Ø40). Select the variant when purchasing.

Applications

clamping end mills, drills and other tools with a Weldon flat shank (DIN 1835 B)
milling with coolant delivered onto the tool from the holder front face, also with tools without internal coolant channels
roughing and heavy machining: rigid clamping, the tool does not rotate in the holder
CNC milling machines and machining centres with an SK40 spindle (DIN 69871) and through-spindle coolant

Specification

Taper type	SK40 (DIN 69871)
Tool clamping	Weldon (side-lock): shank flat and clamping screw
Bore diameter d	6–40 mm (depending on variant)
Clamping screws	1 screw (Ø6–20 mm) or 2 screws (Ø25–40 mm)
Coolant	AD version: coolant through the spindle centre exits through channels at the holder front face, around the tool
Holder runout	≤ 0.005 mm
Balance grade	G6.3 at 15,000 rpm
Material	alloyed case-hardened steel (carburized depth 0.8 ± 0.2 mm)
Hardness	HRC 56–60
Taper	taper tolerance < AT3, surface roughness Ra < 0.2 µm
Standard	DIN 69871 (taper), DIN 6359 / DIN 1835 B (Weldon bore)

Balance grade: G6.3 at 15,000 rpm. If you need a finer balance grade (G2.5) for higher speeds, write to us before purchasing.

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

Dimension table

Dimension drawing – SK40 DIN 69871 Weldon holder with coolant channels Ø6–40 mm

The photo shows a standard SK40 Weldon holder; the coolant channel version has coolant outlets on the front face, as shown in the drawing.

Variant	d [mm]	D [mm]	L [mm]	M (screw)	Number of screws
SK40-SLA06-50K	6	25	50	M6	1
SK40-SLA06-100K	6	25	100	M6	1
SK40-SLA08-50K	8	28	50	M8	1
SK40-SLA08-100K	8	28	100	M8	1
SK40-SLA10-50K	10	35	50	M10	1
SK40-SLA10-100K	10	35	100	M10	1
SK40-SLA12-50K	12	42	50	M12	1
SK40-SLA12-100K	12	42	100	M12	1
SK40-SLA14-50K	14	44	50	M12	1
SK40-SLA14-100K	14	44	100	M12	1
SK40-SLA16-63K	16	48	63	M14	1
SK40-SLA16-100K	16	48	100	M14	1
SK40-SLA18-63K	18	50	63	M14	1
SK40-SLA18-100K	18	50	100	M14	1
SK40-SLA20-63K	20	52	63	M16	1
SK40-SLA20-100K	20	52	100	M16	1
SK40-SLA25-100K	25	65	100	M18×2	2
SK40-SLA32-100K	32	72	100	M20×2	2
SK40-SLA40-120K	40	80	120	M20×2	2

d – bore diameter (tool shank), D – body diameter, L – length from the flange face (spindle side) to the holder front face, M – clamping screw thread.

Read the complete designation of the selected variant. For example, SK40-SLA16-63K means an SK40 taper, a Weldon (SLA) holder for a Ø16 mm shank and length L = 63 mm, K – with coolant channels.

How to select

Check that the spindle has an SK40 interface (DIN 69871), not BT40.
Bore diameter d = tool shank diameter (e.g. an end mill with a Ø16 shank = variant SLA16).
The tool shank must have a Weldon flat (DIN 1835 B); the clamping screw presses on this flat.
The holder coolant channels work when the spindle supplies coolant through the centre (AD version).

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.

How does it differ from a standard Weldon holder?
It has channels through which the coolant from the spindle exits at the holder front face, around the tool. In a standard Weldon holder the coolant flows only through the centre, so it reaches the cutting edges only through the tool's internal channels.

Does the tool need a Weldon flat?
Yes. The holder clamps shanks with a flat to DIN 1835 B (Weldon). For shanks with an inclined flat (Whistle Notch, DIN 1835 E) choose a Whistle Notch holder.