Drill Bits - Hitachi DH 24PD2 Technical Data And Service Manual

8-6. Drill Bits

The chuck section is designed exclusively for the popular and widely available SDS-plus shank bits, as shown in
Fig. 7. Rotating torque is transmitted to the drill bit by two key rails provided in the tool holding section. A steel
ball is used to prevent the bit from falling out.
The service life of a drill bit with a diameter of 8 mm is approximately 300 holes when drilling into concrete with a
depth of 30 mm. If reground before the end of its service life, the drill bit will continue to provide efficient drilling.
Figure 8 shows the regrinding angle.
Shape of SDS-plus shank bit
Regrinding angle of drill bit
Section A - B
Cylinder
Ball holder
Section of the chuck section
Fig. 7
Fig. 8
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Key slot (two pieces)
Section A - A'
Key rail (2 pcs.)
Steel ball
Rotation
direction