Maxdrill Thread Drop Center Bit T38 89mm Button Bit

Product Despcription
Dimensions D Flushing hole(mm) Buttons(mm) Angle Class Part no.
mm in Front No Size Gauge No Size Front No Size Gauge No Size
64 2 1/2 3*7 1*6 4*10 6*11 35® M 3064T3810D
64 2 1/2 3*7 1*6 3*11 6*12 35® H 3064T38F09
64 2 1/2 2*9 - 4*10 8*10 35® H 3064T3812
70 2 3/4 2*8 2*6 4*11 8*11 35® H 3070T3812
76 3 2*9 2*7 4*11 8*12 35® H 3076T3812
89 3 1/2 2*13 2*8 5*12 8*13 35® H 3089T3813
76 3 2*10 2*7 4*11 8*12 35® M 3076T38F12
70 2 3/4 4*8 - 5*10 8*11 30® M 3070T3813D
76 3 4*8 - 5*11 8*12 35® M 3076T3813D
89 3 1/2 4*9 - 6*12 8*13 35® M 3089T3814D
64 2 1/2 3*7 1*6 3*11 6*12 35® M 3064T38F09R
64 2 1/2 2*9 2*6 4*10 8*10 30® M 3064T3812R
70 2 3/4 2*8 2*6 4*11 8*11 35® H 3070T3812R
76 3 2*9 2*7 4*12 8*12 35® H 3076T3812R
89 3 1/2 2*11 2*8 6*12 8*13 35® H 3089T38F14R
64 2 1/2 3*7 1*6 4*10 6*11 35® M 3064T3810DR
70 2 3/4 4*8 - 5*10 8*11 30® M 3070T3813DR
76 3 4*8 - 5*11 8*12 35® M 3076T3813DR
89 3 1/2 4*10 - 6*12 8*13 35® M 3089T3814DR
64 2 1/2 2*7 1*7 - - - - 3264T38
76 3 2*8 1*8 - - - - 3276T38
Remarks:
Hemispherical-66(Usually for very hard rocks)
Ballistic-65(Ususally for medium hard rocks)
Semiballistic-64(Usually for medium hard rocks)
Conical-67(Usually for soft rocks)


The top hammer type rock drilling bit is mainly used for blasting hole excavation of open pit rock drilling, underground roadway, tunnel excavation, hydropower station and other infrastructure projects. The connection mode is mainly T-threaded connection and R-shaped thread connection. The top hammer type hydraulic rock drill rods equipped with drilling rigs and open-air drilling rigs are used to receive the energy transmitted by the rock drill to achieve the effect of breaking the rock.