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JIS MHSL

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
10高炭素鋼2010合金鋼2010調質鋼20
(m/min)( m/ min)(m/min)

Product Features 25〜35HRC ●Ideal for forged products and tempered S48C to S55C materials from 25 to 35 HRC. ●Produced from HSS-Co materials with a special coating for enhanced wear resistance and to improve long tool life.

  • The original left hand spiral flute shape is used to produce a smooth chip discharge and increase performance in the medium tapping speed range. Also, the MHSL improves the internal threads surface finish.

Improved chip ejection!

Tapping Data

Tapping Conditions [M12×1.25]

Workpiece MaterialS53C (forged) / Hub bearingMHSL
Bored Hole Sizeφ10.8Can Continue
Tapping Length12mm through holeCompetitors
Tapping Speed30m/minSpiral Point Tap
MachineHorizontal machining center (fully synchronized feed)0 500（Number 1000of holoes pr 1500ocessed.） 200025003000
Tapping FluidWater soluble cutting fluid
apping Conditions [M12×1.25]Enhancedwear resistanceImproved surface finish
Workpiece Materials S53C（25HRC）
Tapping Length13mmThe p mode abnorevious l caused mal noiseiMHSL has high cutting performance, providing excellent i i MHSL Initial tapping
Tapping Speed30m/minafter 1,239tapping holes.PO i Initiasurface finish of internal threads. bright finish l tapping Internal thread
MachineMachining cente lr lInternal thread
Tapping Fluid Tapping exWater soluble c l amples on thutting fluid e marketLeft-hand With surfa treatment 1,239 hole Wornspiral ce s MHSL 2,800 holes Still works wellLeft- With treat Initi Interhand spiral surface ment al tapping nal thread
MHSLWorkpiece MaterialTapping Condition / Tapping ResultRemarks
Nominal SizeMaterial Symbol (Hardness)Pilot Hole Size （mm）Tapping Length （mm）MachineCutting Speed （m/min）Feed MechanismCutting OilLifetime (Holes or Pieces) Previous State / Workpiece name i
M6×1S35C5.112 （2D）Horizontal MC7.5SynchronizedNon-water soluble10,000Bad surface finish Workpiece name: Shafts
M8×1.25S45C6.88 （1D）Vertical MC40SynchronizedWater soluble9,120Replaced after tapping 5,200 holes Workpiece name: Shafts
M8×1.25S55C (25HRC)6.8512 （1.5D）Vertical MC30SynchronizedWater soluble2,160Unstable tool life Workpiece name: Clutchparts
M10×1.25S45C (23HRC)8.820 （2D）Vertical MC8SynchronizedWater soluble2,450Replaced after tapping 1,600 holes Workpiece name: Arms
M12×1.75S55C (27HRC)10.412 （1D）Vertical MC19SynchronizedWater soluble2,840Unstable tool life Workpiece name: Hub bearings
M14×1.5S53C (25HRC)12.614 （1D）Vertical MC32SynchronizedWater soluble4,430Replaced due to excessive torque after tapping 3,000 holes Workpiece name: Hub bearings
M14×1.5S55C (23HRC)12.614 （1D）Vertical MC22SynchronizedWater soluble2,700Replaced after tapping 2,000 holes Workpiece name: Hub bearings
  • (D) indicates the ratio of the tapping length to the outside diameter.

Examples of machined parts

Excellent durability for tapping through holes in medium hard steels for such as hub bearings of bicycles.