Slim shrink fit extension 3°, cylindrical shank Ø12–32 mm, Ø3–20 mm
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5-axis vise with hard jaws
Self-centering machine vise. Hard jaws included.
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Product code: B02F-73002
Product description
Slim shrink fit extension 3°, cylindrical shank Ø12–32 mm, for tools Ø3–20 mm
Shrink fit extension with a cylindrical shank. The tool is shrink-fitted into the extension, in bore d of the slim 3° section, and the extension shank (diameter D) is clamped in a holder for cylindrical shanks of that diameter. The extension increases the tool reach, and its front section is slim.
A cylindrical-shank tool is clamped without a collet: the heated bore of the extension expands, the shank is inserted to the set depth, and as the extension cools down it clamps the shank around its full circumference. The tool is removed after heating the extension again.
An induction shrink fit unit is needed to insert and remove the tool: without heating the extension, the tool cannot be inserted or removed. The shrink fit unit is not included.
Available variants: shank Ø12: tools Ø3–8 mm, L = 120 mm; shank Ø16: tools Ø3–10 mm, L = 120 and 160 mm; shank Ø20: tools Ø3–12 mm, L = 120 mm; shank Ø25: tools Ø8–16 mm, L = 160 mm; shank Ø32: tools Ø10–20 mm, L = 160 mm. Select the variant when purchasing.
Variants for Ø3–5 mm tools have no stop screw thread (G “–”): set the tool by its insertion depth.
Applications
- extending the reach of end mills, drills and reamers with cylindrical shanks, most often made of solid carbide
- machining in deep and narrow cavities: the slim front section (3° angle) reduces the risk of collision
- clamping a small tool (Ø3–20 mm) in a holder for a larger shank (Ø12–32 mm)
Specification
| Type | shrink fit extension, slim front section with a 3° angle |
| Extension shank D | cylindrical, 12, 16, 20, 25 or 32 mm (depending on variant) |
| Tool shank diameter d | 3, 4, 5, 6, 8, 10, 12, 14, 16, 18 or 20 mm (depending on variant) |
| Tool shank | cylindrical, with a diameter equal to d of the variant |
| Diameter at the front face D1 | 9–26 mm (depending on variant) |
| Length L | 120 or 160 mm (depending on variant) |
| Tool projection setting | thread G for a stop screw in the bore (dimension table), adjustment range 10 mm; the smallest diameters have no thread G (“–” in the table) |
| Tool insertion and removal | induction shrink fit unit (not included) |
Runout and balance: we do not state these values for the extension. If you need them, write to us before purchasing.
Dimension table
| Variant | D [mm] | d [mm] | D1 [mm] | L [mm] | L1 [mm] | G |
| C12-SFS03-120 | 12 | 3 | 9 | 120 | – | – |
| C12-SFS04-120 | 12 | 4 | 10 | 120 | – | – |
| C12-SFS05-120 | 12 | 5 | 11 | 120 | – | – |
| C12-SFS06-120 | 12 | 6 | 12 | 120 | 36 | M5 |
| C12-SFS08-120 | 12 | 8 | 14 | 120 | 36 | M6 |
| C16-SFS03-120 | 16 | 3 | 9 | 120 | – | – |
| C16-SFS04-120 | 16 | 4 | 10 | 120 | – | – |
| C16-SFS05-120 | 16 | 5 | 11 | 120 | – | – |
| C16-SFS06-120 | 16 | 6 | 12 | 120 | 36 | M5 |
| C16-SFS08-120 | 16 | 8 | 14 | 120 | 36 | M6 |
| C16-SFS10-160 | 16 | 10 | 16 | 160 | 42 | M8×1 |
| C20-SFS03-120 | 20 | 3 | 9 | 120 | – | – |
| C20-SFS04-120 | 20 | 4 | 10 | 120 | – | – |
| C20-SFS05-120 | 20 | 5 | 11 | 120 | – | – |
| C20-SFS06-120 | 20 | 6 | 12 | 120 | 36 | M5 |
| C20-SFS08-120 | 20 | 8 | 14 | 120 | 36 | M6 |
| C20-SFS10-120 | 20 | 10 | 16 | 120 | 42 | M8×1 |
| C20-SFS12-120 | 20 | 12 | 18 | 120 | 47 | M10×1 |
| C25-SFS08-160 | 25 | 8 | 14 | 160 | 36 | M6 |
| C25-SFS10-160 | 25 | 10 | 16 | 160 | 42 | M8×1 |
| C25-SFS12-160 | 25 | 12 | 18 | 160 | 47 | M10×1 |
| C25-SFS14-160 | 25 | 14 | 20 | 160 | 47 | M10×1 |
| C25-SFS16-160 | 25 | 16 | 22 | 160 | 50 | M12×1 |
| C32-SFS10-160 | 32 | 10 | 16 | 160 | 42 | M8×1 |
| C32-SFS12-160 | 32 | 12 | 18 | 160 | 47 | M10×1 |
| C32-SFS14-160 | 32 | 14 | 20 | 160 | 47 | M10×1 |
| C32-SFS16-160 | 32 | 16 | 22 | 160 | 50 | M12×1 |
| C32-SFS18-160 | 32 | 18 | 25 | 160 | 50 | M12×1 |
| C32-SFS20-160 | 32 | 20 | 26 | 160 | 52 | M16×1 |
D – extension shank diameter, d – bore diameter (tool shank), D1 – extension diameter at the front face, L – overall length, L1 – maximum tool 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.
The drawing shows three versions of the extension (Figures 1–3): without a step or with a step of diameter D2 over length L2. The table dimensions (D, d, D1, L, L1, G) are marked on Figure 1 and apply to every version; the shape and D2/L2 of a given variant on request.
Read the complete designation of the selected variant. For example, C20-SFS08-120 means an extension with a Ø20 mm shank (C20), a slim 3° shrink fit section (SFS) for a Ø8 mm tool and length L = 120 mm.
How to select
- Diameter d = tool shank diameter (e.g. an end mill with a Ø8 shank = a variant with “SFS08” in the code). The shank must be cylindrical.
- Diameter D = bore diameter of the holder in which you will clamp the extension (e.g. a holder for a Ø20 shank = variant “C20”).
- A shorter extension is stiffer; choose the shortest one that reaches the machining area.
- An induction shrink fit unit is needed to insert and remove the tool.
FAQ
Which holder can the extension be clamped in?
In a holder for cylindrical shanks with diameter D of the selected variant (12, 16, 20, 25 or 32 mm). If you need confirmation for a specific holder or the shank tolerance, write to us before purchasing.
Do I need a shrink fit unit?
Yes. The tool is inserted and removed after heating the extension with an induction shrink fit unit. The shrink fit unit is not included.
Which tools can be clamped?
Tools with a cylindrical shank 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 dimension table.
Why an extension if long chucks exist?
The extension increases the tool reach in a holder you already have, and its slim front section fits into narrow cavities.
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