JIS MHSL

Z-PRO

Spiral Fluted Taps for Carbon Steels of Medium Hardness,

Through Hole Use (with LH Spiral Flutes)

Specification

Coating <2D

Recommended Tapping Speeds depending on Materials

High carbon steelsAlloy steelsThermal refined steels
3高炭素鋼153合金鋼153調質鋼15
(m/min)( m/ min)(m/min)

25〜35HRC Product Features

  • High wear-resistant HSS material and special coating for longer tool life
  • Unique flute design for stable and smooth chip ejection
  • Secures appropriate tool projection length to prevent interference with workpieces

Suitable for tapping threads in mold parts

Tapping Data

Tapping Conditions [M2.5×0.45]

Suitable for creating tip mounting threads

After tapping 200 holes (The tap can still be used for tapping) State of Wear Good internal threads

Workpiece MaterialSCM440(45HRC)
Bored Hole Sizeφ2.1
Tapping Length5mm
Tapping Speed5m/min
MachineMachining center, vertical type (fully synchronized feed)
Tapping FluidWater soluble cutting fluid

Tapping examples on the market

MHSLWorkpiece MaterialTapping Condition / Tapping Result
Nominal SizeMaterial Symbol (Hardness)Bored Hole Size (mm)Tapping Length (mm)Cutting Speed (m/min)Feed MechanismCutting FluidTool Life (Holes/pc)Remarks
M2.5×0.45SCM440 (45HRC)2.14(1.6D)2.5SynchronizedWater soluble300 holesReduced breakage problems
M2.5×0.45SKD61 (45HRC)2.15(2D)5SynchronizedWater soluble150 holes or more (The tap still works well)-
M4×0.7SCM440 (45HRC)3.46(1.5D)5SynchronizedWater soluble351holesReduced tapping time

* (D) indicates the ratio of the tapping length to the outside diameter.

Measures against tapping-related problems

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.

Before countermeasures After countermeasures

Spot facing