HSK-A63 (HSK63A) DIN 69893 Whistle Notch holder (DIN 1835 E) Ø6–40 mm
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5-axis vise with hard jaws
Self-centering machine vise. Hard jaws included.
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Product code: 4520-7958C
Product description
HSK-A63 (HSK63A) DIN 69893 Whistle Notch holder (DIN 1835 E), Ø6–40 mm
Whistle Notch milling holder with an HSK-A63 taper to DIN 69893 (ISO 12164). The tool is clamped by a shank flat inclined at 2° (Whistle Notch, DIN 1835 E) and a clamping screw. The tool shank must have a Whistle Notch flat.
Available bore diameters: 6, 8, 10, 12, 14, 16, 18, 20, 25, 32 and 40 mm. Length L = 80 mm (Ø6–10), 90 mm (Ø12 and Ø14), 100 mm (Ø16–20), 110 mm (Ø25 and Ø32) and 125 mm (Ø40). Select the variant when purchasing.
Applications
- clamping end mills and drills with a Whistle Notch shank (flat inclined at 2°, DIN 1835 E)
- milling and drilling with secure, rigid clamping by a clamping screw
- CNC milling machines and machining centres with an HSK-A63 spindle (DIN 69893)
Specification
| Taper type | HSK-A63 (DIN 69893 / ISO 12164) |
| Tool clamping | Whistle Notch: shank flat inclined at 2° 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 (central coolant supply) |
| Holder runout | ≤ 0.005 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) |
| Material | case-hardened alloy steel (case depth 0.8 ± 0.2 mm) |
| Hardness | HRC 56–60 |
| HSK taper | taper tolerance < AT3, surface roughness Ra < 0.2 µm |
| Standard | DIN 69893 (taper), DIN 1835 E (Whistle Notch bore) |
Balance grade: at least G6.3. Many HSK-A holders of this type are balanced to G2.5 (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 (coolant through the spindle centre). If your spindle supplies coolant in a different way, write to us before purchasing.
Dimension table
The photo shows an HSK-A63 Weldon holder with one clamping screw; the Whistle Notch holder (DIN 1835 E) has its clamping screw positioned as shown in the drawing, and sizes Ø25–40 have two clamping screws.
| Variant | d [mm] | D [mm] | L [mm] | M (screw) | Number of screws |
| HSK63A-SLB06-80 | 6 | 25 | 80 | M6 | 1 |
| HSK63A-SLB08-80 | 8 | 28 | 80 | M8 | 1 |
| HSK63A-SLB10-80 | 10 | 35 | 80 | M10 | 1 |
| HSK63A-SLB12-90 | 12 | 42 | 90 | M12 | 1 |
| HSK63A-SLB14-90 | 14 | 44 | 90 | M12 | 1 |
| HSK63A-SLB16-100 | 16 | 48 | 100 | M14 | 1 |
| HSK63A-SLB18-100 | 18 | 50 | 100 | M14 | 1 |
| HSK63A-SLB20-100 | 20 | 52 | 100 | M16 | 1 |
| HSK63A-SLB25-110 | 25 | 65 | 110 | M18×2 | 2 |
| HSK63A-SLB32-110 | 32 | 72 | 110 | M20×2 | 2 |
| HSK63A-SLB40-125 | 40 | 80 | 125 | M20×2 | 2 |
d – bore diameter (tool shank), D – body diameter, L – length from the HSK flange face (spindle side) to the holder front face, M – clamping screw thread.
Read the complete designation of the selected variant. For example, HSK63A-SLB16-100 means an HSK-A63 taper, a Whistle Notch (SLB) holder for a Ø16 mm shank and length L = 100 mm.
How to select
- Check that the spindle has an HSK-A63 interface (DIN 69893): HSK-A, HSK-E and HSK-F are different shank forms.
- Bore diameter d = tool shank diameter (e.g. an end mill with a Ø16 shank = variant SLB16).
- The shank must have a Whistle Notch flat inclined at 2° (DIN 1835 E). For Weldon shanks (DIN 1835 B) choose a Weldon holder.
FAQ
Will it fit my machine?
The holder has an HSK-A63 shank to DIN 69893 (ISO 12164). Before purchasing, confirm the form and size of the spindle interface in the machine documentation. HSK-A, HSK-E and HSK-F are different shank forms, and 63 and 100 are different sizes, so the designation “HSK” alone is not sufficient to confirm the selection.
How does it differ from a Weldon holder?
The clamping flat of a Whistle Notch shank is inclined at 2° (DIN 1835 E), while a Weldon flat is parallel to the axis (DIN 1835 B). Choose the holder that matches the tool shank.
Which tools can be clamped?
Tools with a Whistle Notch shank (DIN 1835 E) whose diameter equals d of the selected variant, e.g. end mills or drills.
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