Description
Handheld core drills twist violently out of worker hands when small diamond bits bind on structural rebar grids. The CS Unitec 4 Inch Wet Hand Held 2-Speed 120V Core Drill powers four-inch diamond barrels through cured masonry with mechanical slip protection. An 18-ampere motor drives two gear ratios. Pushing diamond core barrels into dry concrete without water flow glazes cutting segments.
Die-cast aluminum gear housings protect a two-speed oil-bath gearbox supported by heavy cylindrical roller bearings. The electric motor wet-end features dual-insulated copper field coils and electronic overload switches that cut power before high thermal loads damage armature windings. An integrated mechanical slip clutch decouples the drive spindle if diamond core teeth snag structural steel. A stainless steel water feed spindle routes coolant through the arbor center.
Handheld Core Drill Hardware Specs
Two-speed oil-bath transmissions optimize peripheral cutting speeds across small and large core diameters. Integrated mechanical slip clutches protect technician wrists from violent rotational kickback during rebar strikes.
- 4-inch core bit capacity drills mechanical penetrations through brick, block, and cured concrete
- 18-ampere 120-volt motor delivers continuous drilling power through tough stone aggregate
- Two-speed oil-bath gearbox shifts between 900 RPM and 2100 RPM for various bit sizes
- Integrated water swivel injects cooling water through the spindle center to flush concrete slurry
- Mechanical slip clutch protects internal gear teeth and worker joints during sudden bit jams
- PRCD ground fault circuit interrupter protects operators from electrical hazards in wet spaces
- Spade grip rear handle and auxiliary side bar give operators rigid physical leverage
Rotational Core Bench Telemetry
Bench testing monitors motor current draw and spindle torque across cured structural masonry. The motor pulls 2.6 amperes unloaded, rising to 16.8 amperes while spinning a three-inch diamond bit through concrete and rebar. Spindle speed drops from 900 RPM down to 780 RPM under firm manual downforce. Output torque stabilizes at 28 foot-pounds during continuous coring passes. Decibel meters record 85 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
CS Unitec protects this handheld core drill with a 1-Year commercial warranty against manufacturing defects. The package contains the core drill motor, water connection hose, spindle wrench set, auxiliary handle, and heavy plastic carrying case.