TRBHSK40A SCHUNK Polygonal tool chucks TRIBOS-S with HSK40A shank DIN ISO 12164-1 for machining in small footprint, clamping diameter of your choice
(Incl. Tax: €431.15)
SCHUNK TRIBOS-S HSK-A40 polygonal toolholders for ultra-precision machining and high-speed cutting. Backlash-free clamping through elastic deformation with run-out < 0.003 mm. Compatible with h6 shank tools, balanced G2.5 at 25,000 rpm and usable up to 85,000 rpm. Support coolant supply up to 100 bar, MQL and axial length adjustment.
SCHUNK TRIBOS-S HSK-A40 polygonal toolholders are designed for high-precision cutting applications and high-speed machining, where system rigidity and consistent run-out accuracy are critical.
The operating principle is based on controlled elastic deformation of the polygonal clamping bore. Using TRIBOS SVP clamping devices, the internal profile is temporarily transformed into a circular shape, allowing tool insertion. Once pressure is released, the holders return to their original geometry, clamping the tool shank uniformly without backlash.
This technology eliminates cumulative tolerances typical of conventional systems, achieving run-out accuracy below 0.003 mm at 2.5 x D with excellent repeatability. The toolholders are designed for h6 shank tools, ensuring stable torque transmission even under high radial loads.
Their extremely slim design allows machining in hard-to-reach areas, increasing flexibility. The lightweight and symmetrical design, balanced G2.5 at 25,000 rpm, enables high-speed machining up to 85,000 rpm, ensuring excellent dynamic stability and superior surface finish.
The toolholders feature axial length adjustment with 10 mm travel for precise presetting and reduced setup time. Compatibility with reduction sleeves allows extended clamping ranges.
They support coolant supply up to 100 bar and are compatible with MQL systems, improving chip evacuation and tool life. The HSK-A40 interface ensures maximum rigidity and precision connection to the machine spindle.
TRIBOS-S HSK-A 40 – Dimensional technical data
| Size | D₂ [mm] | D₃ [mm] | D₄ [mm] | L [mm] | L₂ [mm] | L₃ [mm] | L₄ [mm] | L₅ [mm] | L₆ [mm] | G | Mmin [Nm] | Weight [kg] |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 6 | 9.9 | 13.1 | 32 | 70 | 37 | 10 | 35 | 37.2 | 50 | M5 | 5 | 0.35 |
| 8 | 13 | 15.1 | 32 | 70 | 37 | 10 | 35 | 37.2 | 50 | M6 | 12 | 0.4 |
| 10 | 16 | 18.1 | 32 | 80 | 42 | 10 | 40 | 42.2 | 60 | M8x1 | 20 | 0.4 |
| 12 | 19 | 21.1 | 32 | 85 | 47 | 10 | 45 | 47.2 | 65 | M8x1 | 30 | 0.45 |
| 16 | 25 | 27.1 | 32 | 85 | 48 | 10 | 45 | 47.2 | 65 | M8x1 | 70 | 0.47 |
| 20 | 30 | 32.1 | 90 | 52 | 10 | 45 | 70 | M8x1 | 150 | 0.5 |
TRIBOS-S HSK-A 40 – Technical features and benefits
| Version | Ideal for chip-removal machining operations – radial forces must be taken into account |
| Run-out accuracy | < 0.003 mm at 2.5 x D |
| Balancing grade | G2.5 at 25,000 rpm or Umax < 1 gmm |
| Tool shank quality | h6 |
| Reduction sleeves | Clamping additional shank diameters with reduction sleeves |
| Data support | Chip seat bores compliant with DIN 69873 |
| MQL (minimum quantity lubrication) | Design suitable for MQL (minimum quantity lubrication) available on request |
| Toolholder replacement | For automatic toolholder replacement |
| Axial adjustment screw | With axial length adjustment screw |
| Axial length adjustment | Length adjustment within a precision range of 0.01 mm, with 10 mm adjustment travel |
| Extremely slim design | Precise machining operations, even at workpiece points that are difficult to reach |
| High flexibility | Clamping different diameters thanks to the use of grooved or sealed intermediate sleeves |
| Lightweight design | Fast feed and speed range up to 85,000 rpm (HSC) |
| Constant run-out and repeatability accuracy | < 0.003 mm |
| Total compatibility | Ideally combinable with TENDO SVL and TRIBOS SVL extensions |
| Excellent vibration damping | Micro blowholes are avoided and better workpiece surfaces are achieved, the machine spindle is protected, tool life is extended and therefore costs are reduced |
| Standard fine balancing | Suitable for high speeds with a balancing grade of G2.5 at 25,000 rpm |
| Symmetrical rotation design | The rotationally symmetrical structure minimizes the interference contour and ensures a high rotational speed |
TRIBOS-S HSK-A 40 – Technology and operating principle
| Product description | Extremely slim polygonal toolholders. Precision for machining conditions in extremely confined spaces. When some workpiece areas are very difficult to reach or common clamping systems reach their limits, the solution is represented by TRIBOS-S polygonal clamping holders with their extremely slim structure. Maximum constant concentricity and repeatability accuracy < 0.003 mm ensure even more uniform cutting edge action, improving tool life by more than four times. |
| Technology | TRIBOS SVP actuation devices deform the polygonal shape of the toolholder until it becomes circular, making tool insertion possible. When pressure is released, the toolholder returns to its original polygonal shape, securely and precisely locking the inserted tool shank. |
| Element 1 | Axial adjustment screw – For easy and fast tool presetting |
| Element 2 | Base body – The machine-side interface is located on the base body |
| Step 1 | Polygonal clamping diameter – By means of TRIBOS SVP devices and the application of the respective actuation pressure, the polygonal clamping diameter of the toolholder deforms and becomes circular. |
| Step 2 | The polygonal clamping diameter takes on a circular shape through actuation pressure, thus facilitating insertion of the tool shank. |
| Step 3 | Insertion of the tool shank – When the pressure exerted on the clamping diameter is reduced, it resumes its original polygonal shape. |
| Step 4 | Tool clamped – The inserted tool shank is locked reliably with high repeatability accuracy. |
- Brand:
- SCHUNK
- Typology:
- Polygonal closure
- Shank Type:
- HSK40A
