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Drill Bit
R thread drill bit includes X, EX, XX, EXX, EY, EYY, EC, ECC, etc.

Drill bit is used for drilling, which is installed with anchor bars. As there is no need to pull out of the anchor bar, drill bit can be used for only one time. After the anchor bars are installed, drill bits will be left in the borehole. Sinorock provides a full range of drill bits to meet customers' requirements. Drill bit is widely used in tunnel pre-support, soil nailing, slope stabilization, building foundation, etc.


1. It's suitable for various conditions, such as tunnel pre-support, soil nailing, slope stabilization, building foundation.
2. Easy installation.  
3. Different bits for kinds of rock formations, including cross-cut drill bit, button drill bit, tungsten carbide cross-cut drill bit, tungsten carbide button drill bit, clay bit, etc.

Main selection criteria for MAI SDA drill bits are:

1. Service life of the drill bits should be at least equal to the anchor bar.
2. Its performance design depends on different ground formations encountered.
3. Diameter depends on geotechnical conditions and design requirements. 

                          EYY                                             EC                                          ECC                        
                         ESF                                           ESSF                                           ESSD                
                        EXX                                             EY                                             X                                
                 Clay Bit                                        ESD                                            EX

Drill Bit(R)
Size  R25  R32  R38 R51
Clay Bit -  R32/76(0.6)  R38/90(1.0) R51/76(0.95)
 R32/90(1.0)  R38/100(1.2) R51/90(1.0)
 R32/110(1.7)  R38/110(1.2) R51/115(1.45)
-  R38/130(1.3) R51/130(2.2)
R38/150(1.5) R51/150(2.68)
- R51/175(3.1)
X  R25/42(0.35)  R32/51(0.5) - -
EX  R25/42(0.3)  R32/51(0.34)  R38/76(1.0) R51/100(1.7)
R32/64(0.6) R51/110(2.05)
 R32/51(0.8) R51/115(2.1)
 R25/51(0.3)  R32/51(1.1)  R38/90(1.30) R51/130(3.9)
 R32/51(1.3) R38/100(1.4) -
XX - -  R38/110(1.4) R51/110(1.65)
 R38/130(2.0) R51/130(2.2)
 R38/130(2.3) R51/150(2.5)
- R51/170(2.7)
EXX  R25/42(0.3)  R32/51(0.4)  R38/76(0.95) R51/90(2.0)
R25/51(0.38)  R32/51(0.5)  R38/90(2.16) R51/100(2.3)
- - - R51/115(2.0)
EY R25/51(0.36) R32/51(0.32) R38/76(0.9) -
R32/76(0.7) R38/90(1.2)
EYY - R32/51(0.4) R38/76(0.9) -
R32/76(0.74) R38/90(1.36)
EC -  R32/51(0.35) - -
ECC -  R32/51(0.4) - -
ES-F R25/42(0.3)  R32/51(0.37) R38/76(1.05) R51/100(1.55)
R25/51(0.35) R32/76(1.0) R38/76(1.2) R51/115(2.0)
ESS-F  R25/42(0.3)  R32/51(0.42) - R51/76(1.7)
 R32/51(0.9) - R51/110(1.8)
 R32/65(1.2) R38/76(1.33) R51/100(2.85)
 R32/76(1.3) R38/90(2.35) R51/115(3.85)
 R32/76(1.95) R38/115(3.75) R51/130(4.6)
- - R51/150(6.5)
ES-D - - - R51/115(2.0)
ESS-D - - R51/115(2.0) R51/115(2.0)