... , and more suitable for drilling at high rotary speed and high tem-perature working condition.3. New materl is applied on the ... 437 9-1/2 6-5/8REG 60 9-3/4GY437FC 437 9-3/4 6-5/8REG 65 9-1/2GY517FT ... , Drilling weight:0.35~1.05 KN/mm, Rotary speed, 220~60 r/m.3, Medium soft with hard abrasive treak, such ... : 537, Drilling weight 0.35~1.05 KN/mm, Rotary speed, 200~40 r/m. F/FC series tricone rock bits for ...