Description
Underpowered rotary hammers smoke and stall when drilling large anchor holes through bridge abutments and foundation footers. The Bosch 1-5/8 Inch SDS-max Combination Hammer delivers dependable demolition and drilling power without hesitation. A 13-ampere motor generates 6.5 foot-pounds of impact energy at 2900 blows per minute. Running SDS-max bits into heavy solid steel beams will slip mechanical clutches.
Die-cast magnesium gearboxes house an electro-pneumatic hammer piston and striker unit mounted in heavy needle bearings. The motor wet-end features dual-insulated copper windings and high-grade carbon brushes that deliver continuous cutting torque under severe masonry friction. Precision ball and needle bearings support the drive spindle to resist severe axial thrust. Mechanical torque limiters decouple gear teeth when large core bits snag hidden framing rebar.
Combination Hammer Hardware Specs
Massive electro-pneumatic hammer pistons deliver 6.5 foot-pounds of impact energy for rapid anchor hole production. Mechanical torque limiters decouple drive gears during sudden bit bind-up to protect operator wrists.
- 1.625-inch solid bit capacity cuts heavy structural anchor holes through cured commercial concrete
- 6.5 foot-pounds of impact energy smashes hard aggregate without operator fatigue
- 13-ampere 120-volt motor delivers sustained hammer power under heavy operator hand feed
- Mechanical torque limiters decouple drive gears during sudden bit bind-up to protect wrists
- Two-mode selector switch chooses rotary hammer drilling or hammer-only chiseling operations
- Constant Response circuitry maintains impact cadence and rotation speed under heavy downforce
- SDS-max drive chuck locks large core bits and demolition chisels securely without slip
Hammer Dyno Bench Readings
Dyno bench instruments evaluate electrical current draw and impact energy during concrete penetration. Unloaded motor rotation draws 3.4 amperes at 120 volts, surging to 12.4 amperes while drilling 1-1/2-inch holes in high-strength concrete. Spindle rotation drops from 340 RPM free speed down to 285 RPM under heavy feed downforce. Striker cadence hits 2900 BPM under load. Sound meters record 94 dBA at operator ear level. Front 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.
- Put a dab of grease on bit shanks before inserting them into the SDS-max chuck.
- Wipe abrasive dust off the front chuck rubber seal sleeve after every work shift.
- Blow dry compressed air through motor intake grilles every forty hours of use.
Commercial Warranty Package Inventory
Bosch covers this SDS-max combination hammer with a 1-Year commercial warranty on tool components. The package includes the 1-5/8-inch SDS-max rotary hammer, auxiliary side handle, depth stop rod, and heavy carrying case.