One of the most important specifications when purchasing a DTH drill bit is the bit shank.
A drill bit may have the correct diameter but still be completely incompatible with the hammer if the shank design is wrong.
The shank is the rear section of the drill bit that fits inside the hammer.
It is responsible for:
Receiving piston impact
Transferring impact energy
Engaging with the hammer
Allowing controlled bit movement
Supporting air distribution and flushing
Professional DTH drilling markets use several shank systems, including:
DHD
QL
SD
COP-type systems
Other hammer-specific designs
Within each family, different sizes are available for different hammer classes.
For example, DHD-series applications can include DHD340-, DHD350- and DHD360-type configurations, while QL systems can include QL40-, QL50- and QL60-type designs.
Installing an incorrect shank can cause:
Failure to install
Poor piston contact
Incorrect air distribution
Abnormal spline wear
Energy loss
Premature hammer or bit damage
Never select a bit by outside diameter alone.
After confirming the shank, check:
Required hole diameter
Hammer size
Bit face
Button configuration
Rock formation
Air pressure and airflow
YKDRILL supplies multiple DTH bit configurations for international drilling markets, including different shanks, diameters and face designs.
When the exact specification is unknown, buyers should provide the existing hammer model, old drill-bit photos and dimensional information before ordering.
Correct shank identification is the first step toward reliable hammer-and-bit matching.
