Description
Continuous vibration from heavy rotary hammers deadens operator fingers and slows crew output across long foundation drilling jobs. The Bosch 1-3/4 Inch SDS-max Rotary Hammer combines high-impact penetration with dual-stage vibration reduction. An 8.1 foot-pound electro-pneumatic striker hammers aggregate at 2900 blows per minute. Pushing dull cutting teeth into solid rebar without backing off slips the mechanical safety clutch.
Die-cast magnesium gearboxes house heat-treated alloy steel pinions running inside sealed grease chambers. The 13.5-ampere 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. Constant Response electronics maintain speed under heavy downforce while protecting the motor from overload thermal spikes.
SDS-Max Rotary Hammer Hardware Matrix
Electro-pneumatic strikers deliver 8.1 foot-pounds of impact energy for rapid anchor hole production. 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
- 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
Electrical Load 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.