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JIS UH-CT

Carbide taps for ultra hard materials

Specification

Coating <1.5D

Recommended Tapping Speeds depending on Materials

Thermal refined steels

調質鋼5

(m/min) 50〜63HRC

Product Features

  • The UH-CT is designed for tapping SKD and pre-hardened steel 50HRC to 63HRC (Max 63).
  • It is produced from a ultra fine grain cemented carbide with superior abrasion resistance and impact resistance.

●The UH-CT has an improved shank roundness accuracy.

  • 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

Tapping Conditions [Ｍ8×1.25] Tool Life

80 Workpiece Material ＳＫＤ１１hardened material (60 HRC)

Bore Diameter φ６．９606060
UH-CTHolesHoles
Tapping Length １6ｍｍ through hole40
Standard
Tapping Speed １．５ｍ/ｍｉｎ（６０ｒｐｍ）Carbide hard Tap.8 Holes
Ｎ-CT20
Machinery Type ＣＮC rigid tapping machine
01020304050600
Tapping Fluid Non-water soluble cutting oil

Number of tapped holes. 10 20 30 40 50 60

（Number of threads tapped.） UH-CT Ｎ-CT

The figure above is a comparison of the number of tapped holes using a standard carbide tap (N-CT) and aThe figure above shows the relationship between the
carbide tap in SKD 11 high hardness quenched steel at 60 HRC. The N-CT tap, had chipped flutes atnumber of tapped holes and the load meter (%) of
8 holes. Compared to the N-CT, the UH-CT was able to process 60 holes in ultra high hardness steel. It isthe machine when machining tests are conducted up

to 60 holes with UH - CT tap. The numerical value important to watch for a dull drill as it will cause the taps flutes to wear prematurely. The drilling is of the load meter tends to increase as the number of processed at a 6m/min. cutting speed and a 0.04mm/rev. feed which can easily cause work hardening.

tapped holes increase at 50 completed threads. The cutting edge damage at this point causes the load

＊ Bored hole in this test was prepared by using a carbide drill under such condition as could cause nometer to raise quickly beyond 50 tapped holes. As
work-hardening. (cutting speed: 6m/min, feed 0.04m/rev.)the number of tapped holes progresses further, the

risk of tap breakage is considerable and the load will increase, so it is recommended to set the life expectancy at a safe level considering the high hardness of the steel being processed.

Selection of hole diameter (reference) Product system table

Unit：mm Unit：mm

JIS6H（Level 2）JIS6H（Level 2）SLowTapping SpeedFast
Internal Thread DimeterInternal Thread Dimeter

Thread Hole Thread Hole Work piece Work piece

HoleHoleHoleHoleMaterial135615Material
Size SizeSize Sizem/minm/minm/minm/minm/min
SizeSizeSizeSize
（） （）60HRCUH-CT60HRC
（Max）（Min）MaxMin
High55HRC55HRCHigh
M2 ×0.41.651.6791.567M12×1.7510.410.44110.106hardnesshardness
material55HRC55HRCmaterial
M2.5×0.452.112.1382.013M12×1.510.6010.67610.376EH-CT
  • 45HRC 45HRC

M2.6 0.45 2.21 2.238 2.113 M12 1.25 10.90 10.912 10.647

Tempered 45HRC 45HRC Tempered

M3 ×0.52.562.5992.459M14×212.112.21011.835material※ Please use UH-CT,EH-HTmaterial
25HRC25HRC
Tool steel・EH-CT with completeEH-PO・Tool steel
M4 ×0.73.403.4223.242M14×1.512.6012.67612.376SKSSKDsynchronous feed.SKSSKD
Alloy steelSCM ・SCrSCM・SCrAlloy steel
M5 ×0.84.304.3344.134M16×214.114.21013.8353m/min 1m/min15m/min 6m/min 5m/min
  • * Please use synchronous type tooling for UH - CT / EH - CT.
M6 15.105.1534.917M161.514.6014.67614.376
M8 ×1.256.906.9126.647M18×2.515.715.74415.294
M10 ×1.58.608.6768.376M18×1.516.6016.67616.376
M10 ×1.258.908.9128.647M20×2.517.617.74417.294
JISM20×1.518.6018.67618.376