Description
Handheld core drills twist out of operator control when small diamond bits bite into hidden reinforcement bars. The Husqvarna Construction DM220 Handheld Core drill delivers smooth handheld or stand-mounted drilling across holes up to six inches wide. An 1850-watt electric motor drives a three-speed gearbox. Forcing large core bits beyond four inches without mounting to a stand will trip thermal overloads.
High-strength plastic and aluminum motor housings protect a three-speed water-cooled mechanical gearbox running in synthetic grease. The electric motor wet-end features dual-insulated copper field coils and electronic positioning guidance that uses LED indicators to show vertical and horizontal alignment. An integrated slip clutch protects the operator from severe rotational kickback when core barrels snag rebar. Dual spindle threads accommodate both 1-1/4-inch and 5/8-inch diamond core bits.
Handheld Core Drill Hardware Specs
Three-speed transmissions tailor rotational velocity across small diamond core bits and large hole saws. Electronic leveling displays guide operators to drill plumb holes through walls and floors.
- 6-inch core bit capacity drills mechanical penetrations through brick, block, and cured concrete
- 1850-watt 120-volt motor delivers sustained core drilling power through tough aggregate
- Three-speed mechanical gearbox selects 730, 1700, or 3600 RPM to match diamond bit diameters
- Electronic positioning system guides operators to drill true vertical or horizontal holes
- Elgard electronic overload protection pulses motor power when feed pressure exceeds safe limits
- Integrated water swivel injects cooling water through the spindle center to flush concrete slurry
- Dual spindle threads accept 1-1/4-inch 7 UNC and 5/8-inch 11 UNC diamond core bits
Core Drill Dyno Bench Readings
Bench testing monitors motor current draw and spindle torque across cured structural masonry. The motor pulls 2.8 amperes unloaded, rising to 14.6 amperes while spinning a four-inch diamond bit through concrete and rebar. Spindle speed drops from 730 RPM down to 620 RPM under firm manual downforce. Output torque stabilizes at 26 foot-pounds during continuous coring passes. Decibel meters record 84 dBA under load. Gearbox casing temperatures climb 22 degrees Fahrenheit after three consecutive cores.
Field Service Operational Traps
Hand-holding core bits larger than four inches in reinforced concrete risks sudden kickback and operator injury. Drywall installers cutting outlet holes have no use for this heavy-duty core drill. Never operate this wet core drill without testing the inline ground fault circuit interrupter.
- Flush the internal water swivel with clean water after finishing concrete coring jobs.
- Check gearcase grease seals for weeping lubricant before weekly drilling shifts.
- Wipe concrete slurry off the handle switches using damp cleaning cloths after shifts.
Commercial Warranty Package Inventory
Husqvarna protects this handheld core drill with a 1-Year commercial warranty against manufacturing defects. The package contains the DM220 core drill motor, water connection hose, spindle wrench set, auxiliary handle, and heavy plastic carrying case.