Drill bits are designed for percussive rotary drilling of wells
of various purposes with diameter from 33 to 43 mm in rocks and ores with coefficient of hardness f=6...5 MPa.
f=6...20 on the scale of Professor Protodyakonov (GOST 21153.1-76) and can be used for underground drilling operations.
for drilling operations underground at compressed air pressure of 0.5...0.7 MPa.
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