fortis Collet chuck DIN 69871ADB SK40-ER25 extra long

- Tool holder DIN 69871 Form AD/B
- Made of alloy case hardening steel
- Hardened 58 ±2 HRC, min. 0.5 mm deep
- Tensile strength in the core after case hardening approx. 950 N/mm²,
- Taper DIN 254
- Taper angle tolerance AT3
- Surface accuracy of the taper Ra <0.001 mm
- To accommodate tools
with cylindrical shank and lateral driving surface
- Concentricity 0.01 mm
- Balance quality G 6.3 at 15000 min-1