Description
Underpowered rotary hammers smoke and stall when drilling large anchor holes through bridge abutments and foundation footers. The Bosch Rotary Hammer 1 3/4in SDS max delivers 8.1 foot-pounds of impact energy to crush heavy structural concrete. A 13.5-ampere motor generates 2900 blows per minute for deep foundation drilling. Running SDS-max bits into heavy solid steel beams will slip mechanical clutches.
Die-cast magnesium gearcases house an air-cushioned striker mechanism running inside sealed grease chambers. The motor wet-end features dual-insulated copper field coils and high-grade carbon brushes that deliver continuous cutting torque under severe masonry friction. Vibration Control handles decouple mechanical hammer shock from technician palms. Electronic constant response circuitry maintains speed under heavy downforce while protecting the motor from overload thermal spikes.
SDS-Max Rotary Hammer Hardware Specs
Air-cushioned striker mechanisms deliver 8.1 foot-pounds of impact energy directly to SDS-max drill bits. Active Vibration Control suspension handles isolate technician hands from mechanical recoil.
- 1.75-inch solid bit capacity cuts deep structural anchor holes in reinforced concrete
- 8.1 foot-pounds of impact energy pulverizes hard aggregate with minimal operator downforce
- 13.5-ampere 120-volt motor delivers 2900 blows per minute for rapid anchor hole production
- Vibration Control handle decouples mechanical hammer shock from technician palms
- Electronic constant response circuitry maintains impact speed under heavy downforce
- Two-mode selector switch chooses rotary hammer drilling or hammer-only chiseling operations
- SDS-max tool chuck locks large core bits and demolition chisels securely without slip
Pneumatic Hammer Bench Telemetry
Bench testing monitors electric current and impact stroke cadence through cured 5000 PSI concrete. Free motor rotation draws 3.6 amperes at 120 volts, surging to 13.2 amperes while driving a 1-3/4-inch carbide bit. Spindle rotation drops from 340 RPM free speed down to 285 RPM under heavy downforce. Striker cadence hits 2900 BPM under active load. Sound level meters read 95 dBA at operator ear level. Gearcase exterior temperatures climb 26 degrees Fahrenheit after fifteen holes.
Field Service Operational Traps
Neglecting bit shank grease causes high-friction galling that seizes expensive SDS-max bits inside the chuck. Finish carpenters installing cabinets have no need for this heavy masonry hammer. Never operate the hammer mechanism without applying firm forward contact pressure.
- Grease bit shanks with high-temperature chisel paste before inserting into the chuck.
- Wipe concrete dust off the rubber chuck nose cone after every shift.
- Clean power cord insulation jackets using solvent wipes to inspect for wire cuts.
Commercial Warranty Package Inventory
Bosch covers this rotary hammer with a 1-Year commercial warranty on tool components. The package includes the 1-3/4-inch SDS-max rotary hammer, auxiliary side handle, depth stop rod, and heavy carrying case.