Small size Taper upto MT-4 made from Bearing steel EN-31 and through hardened to 58 to 60 HRc Big size Tapers from MT-5 upwards made from 20 MnCr5 and Case Hardened to 58 to 60 HRc.
Broadly confirms to IS : 2289-1976(Equivalent to DIN:806-1961/ISO:298)
Precision ground
Tip runout with..
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