Bosch 1-9/16 Inch Spline Combination Rotary Hammer

Description

Worn splines strip out of standard hammer chucks, causing expensive drill bits to slip and bind inside deep anchor holes. The Bosch 1-9/16 Inch Spline Combination Rotary Hammer delivers dependable demolition and drilling power without bit slippage. An 11-ampere motor generates 6.1 foot-pounds of impact energy at 2800 blows per minute. Jamming large spline core bits into solid steel rebar will slip the mechanical clutch.

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 spline drive spindle to resist severe axial thrust. Mechanical torque limiters decouple gear teeth when large core bits snag hidden framing rebar.

Spline Rotary Hammer Hardware Specs

Heavy spline drive chucks transfer rotational torque across six positive drive lugs without slippage under load. Mechanical torque limiters decouple drive gears during sudden bit bind-up to protect operator wrists.

• 1.562-inch solid bit capacity cuts heavy structural anchor holes in cured industrial concrete
• 6.1 foot-pounds of impact energy pulverizes hard aggregate during heavy foundation drilling
• 11-ampere 120-volt motor delivers sustained hammer power under heavy operator hand feed
• Spline drive chuck provides positive torque transmission across six heavy steel drive splines
• Two-mode selector lever shifts between hammer drilling and hammer-only chiseling operations
• Vario-Lock positioning rotates and locks chisels into twelve different angle positions
• Mechanical torque limiters decouple drive gears during sudden bit bind-up to protect wrists

Hammer Bench Load Telemetry

Bench testing monitors motor current draw and impact cadence through cured 5000 PSI concrete. Free motor rotation draws 3.4 amperes at 120 volts, surging to 11.6 amperes while driving a 1-1/2-inch spline bit through concrete and rebar. Spindle rotation drops from 490 RPM free speed down to 410 RPM under heavy feed downforce. Striker cadence hits 2800 BPM under load. Decibel sound level meters read 93 dBA at operator ear level. Front gearcase exterior temperatures climb 25 degrees Fahrenheit after fifteen holes.

Field Service Operational Traps

Inserting dry unlubricated spline bit shanks into the chuck wears drive splines and seizes tools. Drywall contractors hanging metal studs have no use for this heavy-duty rotary hammer. Never operate this machine in chisel mode with the rotation lock lever disengaged.

• Coat spline bit shanks with high-pressure chisel grease before inserting into chuck collars.
• Wipe abrasive concrete powder off the chuck nose seal sleeve after every work shift.
• Blow dry compressed air through motor intake grilles every forty hours of use.

Commercial Warranty Package Inventory

Bosch protects this corded spline rotary hammer with a 1-Year commercial warranty against defects. The package contains the 1-9/16-inch spline rotary hammer, auxiliary side handle, depth stop rod, and heavy carrying case.