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JIS EH-CT

Carbide Taps for Hard Materials

Specification

Coating <1.5D

Recommended Tapping Speeds depending on Materials

Thermal refined steels

調質鋼5

(m/min)

45〜55HRC

Product Features

●Ideal for high hardness steel tapping from 45 to 55 HRC. For hot mold SKS 3 and SKD 11. ●The ultra fine grain cemented carbide is superior in abrasion resistance and impact resistance. ●Better concentricity improves the accuracy of the entire tap and roundness of the shank.

  • Recommended tapping length is "Major diameter size x 1.5" or less 5P chamfer for better tool life.

●For the bored hole diameter, the maximum minor diameter of a 6H internal thread diameter maximum value is recommended.

Tapping Data [ M8×1.25 ]

Tapping Data 〈Torque line in the different bored hole size〉

Bored Hole Size 6.8mm(Actual 6.79mm) 6.9mm(Actual 6.89mm)

stillstillThread Engagement Ratio89％81％
EH-CTrunning running
1000torque（Ｎ・㎝）1000
900900
800thrust（Ｎ）800
Breakage 700700
Previous600600
（Carbide tap）500500
Beginning 400400
300300
200200
050100150200250300350400(holes)100100
00
WorkTypeHot forged die steel（SKD61）-100 012 10 8 6 4 2 12 10 8 6 4 2 -100 0
stillstill Torque-200-200
EH-CTMaterialTorque(average) 680N.cm Torque(average) 770N.cm
Hardness 50HRCrunning running stillstill and
EH-CTTapping Speed6m/minrunning running Thrust Lines10001000
900900
PreviousBreakageAfter 800800
FeedFull rigid700700
（Carbide tap）600600
Breakage50 500500
PreviousTapping FluidNon-water soluble cutting oil400400
050(holes) 400 350 300 250 200 150 100Holes 300300
（Carbide tap）200200
Tapping 100100
050(holes) 400 350 300 250 200 150 10000
-100 012 10 8 6 4 2 12 10 8 6 4 2 -100 0
-200-200
stillstillTorque(average) 780N.cm Torque(average) 890N.cm
EH-CTrunning running
Tapping condition
PreviousBreakageWork MaterialDAC （equivalent to SKD61）50HRC
（Carbide tap）Tapping Speed6m/min
050(holes) 400 350 300 250 200 150 100
FeedRigid
WorkTypeStainless steel for plastic die（SUS420J2）Tapping FluidNon-water soluble cutting oil
MaterialHardness 52HRC
Tapping Speed6m/minBored hole size enlarged by 0.1mm can reduce the tapping resistance
FeedFull rigidtorque by 10%.
Tapping FluidNon-water soluble cutting oilIn tapping the material of high hardness, it is recommendable to make
the bored hole size as large as possible.
Recommended bored hole size (for reference) Application
unit : mm
SLowFast Tapping Speed
SizeRecommended BoredMinor Dia. of JIS 6H ThrClass Internal Screw ead
Hole SizeMax. ToleranceMin. Tolerance
M3×0.52.562.5992.459
M4×0.73.403.4223.242
M5×0.84.304.3344.134
M6×15.105.1534.917
M8×1.256.906.9126.647
M10×1.58.608.6768.376
M12×1.7511.410.44110.106

60HRC 60HRC

High55HRC55HRCHigh
Materials55HRC55HRCmaterials
Heat Treated45HRC45HRCHeat Treated
25HRCrotation synchronized25HRC