HSS Spiral Grooved Step Drills
The CBN ground and spiral flutes guarantee quiet running and high cutting performance. Especially the chip flow is optimized, so even long, non-breaking chips will be removed easily. The optimized chip flow protects the cutting edges and reduces built-up edges and cold weld marks. The cone makes it easier to withdraw the tool from the material.
| Size Range | Step No. | Shank Size |
| 4 – 12mm x 2mm | 5 | 6mm |
| 4 – 12 mm x 1mm | 9 | 6mm |
| 4 – 20mm x 2mm | 9 | 8mm |
| 4 – 22mm x 2mm | 10 | 8/10mm |
| 4 – 30mm x 2mm | 14 | 10mm |
| 4 – 32mm x 2mm | 15 | 10mm |
| 4 – 39mm x 2-3mm | 14 | 10mm |
| 5 – 28mm | 7 | 10mm |
| 5 – 28.3mm | 10 | 10mm |
| 5 – 35mm x 2-3mm | 13 | 13mm |
| 6 – 18mm x 2mm | 7 | 10mm |
| 6 – 20mm x 2mm | 8 | 10mm |
| 6 – 24mm x 2mm | 10 | 10mm |
| 6 – 25mm | 7 | 10mm |
| 6 – 26.75mm | 8 | 10mm |
| 6 – 30mm x 2mm | 13 | 10mm |
| 6 – 30.5mm | 10 | 10mm |
| 6 – 32mm | 8 | 10mm |
| 6 – 32mm | 9 | 10mm |
| 6 – 37mm | 12 | 10mm |
| 6 – 38mm | 12 | 10mm |
| 6 – 40mm | 16 | 13mm |
| 9 – 36mm x 3mm | 10 | 12mm |
| 10 – 20mm x 1mm | 11 | 10mm |
| 12 – 20mm x 1mm | 9 | 10mm |
| 12.5 – 30.5mm | 7 | 12mm |
| 13 – 38mm | 10 | 12mm |
| 14 – 24mm x 2mm | 6 | 13mm |
| 14 – 25mm | 7 | 13mm |
| 20 – 30mm x 1mm | 11 | 13mm |
| 20 – 34mm x 2mm | 8 | 13mm |
| 30 – 40mm x 1mm | 11 | 13mm |
| 40 – 50mm x 1mm | 11 | 13mm |
| 50 – 60mm x 1mm | 11 | 13mm |
| 5 – 30.5mm | 13 | 12mm |
| 5 – 38mm | 14 | 12mm |
