
Spiral Fluted Taps for Carbon Steels of Medium Hardness,
| High carbon steels | Alloy steels | Thermal refined steels |
| 3高炭素鋼15 | 3合金鋼15 | 3調質鋼15 |
| (m/min) | ( m/ min) | (m/min) |
25〜35HRC Product Features
After tapping 200 holes (The tap can still be used for tapping) State of Wear Good internal threads
| Workpiece Material | SCM440(45HRC) |
| Bored Hole Size | φ2.1 |
| Tapping Length | 5mm |
| Tapping Speed | 5m/min |
| Machine | Machining center, vertical type (fully synchronized feed) |
| Tapping Fluid | Water soluble cutting fluid |
| MHSL | Workpiece Material | T | apping Con | dition / Tap | ping Result | |||
| Nominal Size | Material Symbol (Hardness) | Bored Hole Size (mm) | Tapping Length (mm) | Cutting Speed (m/min) | Feed Mechanism | Cutting Fluid | Tool Life (Holes/pc) | Remarks |
| M2.5×0.45 | SCM440 (45HRC) | 2.1 | 4(1.6D) | 2.5 | Synchronized | Water soluble | 300 holes | Reduced breakage problems |
| M2.5×0.45 | SKD61 (45HRC) | 2.1 | 5(2D) | 5 | Synchronized | Water soluble | 150 holes or more (The tap still works well) | - |
| M4×0.7 | SCM440 (45HRC) | 3.4 | 6(1.5D) | 5 | Synchronized | Water soluble | 351holes | Reduced tapping time |
* (D) indicates the ratio of the tapping length to the outside diameter.
When tapping internal threads in a through hole toward the slanted surface as shown on the left, spot facing as shown on the right is recommended to prevent the occurrence of a broken tap or such other problems.