... , IADC qualified. 2, Meta sealing. 3, Bit size: 8-1/2" ~ 12-1/4. 4, Connection: 4-1 ... rotary speed and high tem-perature working condition.3. New materl is applied on the part ... 60 12-1/4GHJ437T 437 12-1/4 6-5/8REG 98 12-1/4GHJ517T 517 12-1/ ... KN/mm, Rotary speed, 250~60 r/m.3, Medium soft with hard abrasive treak, such ... 1.05 KN/mm, Rotary speed, 200~40 r/m. ( function(){ var aBigImageSrc = [ 'http://i00. ...