Drill Bits - Hitachi DH 24PF3 Technical Data And Service Manual

8-4. Drill Bits

The chuck section is designed exclusively for the popular and widely available SDS-plus shank bits, as shown in
Fig. 10. 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 coming off.
Key slot (two pieces)
Section A - A'
Shape of SDS-plus shank bit
Key rail (2 pcs.)
Cylinder
Steel ball
Ball holder
Chuck section
Fig. 10
The service life of a drill bit with a diameter of 8 mm is approximately 300 holes when drilling into concrete to a
depth of 30 mm. If reground before the end of its service life, the drill bit will continue to provide efficient drilling.
Figure 11 shows the regrinding angle.
Regrinding angle of drill bit
Section A - B'
Fig. 11
--- 22 ---