Tools and Equipment
Bosch HD21-2 HD19-2 and HD19-2D hammer drills
By Anthony Capkun
Bosch Power Tools and Accessories introduced three new 2-speed hammer drills. The new HD21-2, HD19-2 and HD19-2D boast a 17-tooth ratchet disc design that optimizes drilling speed, says Bosch, by maximizing impact energy at lower RPMs. By balancing the speed of the drill (3000 rpm) with the impact rate (51000 bpm), the ratcheting teeth make full contact with each other, thereby increasing drilling speed in concrete. The HD19 has a dual-fan system that, boasts Bosch, enables the tool to run up to 50% cooler than other models in its class. The 2-mode selector switch easily converts the tools from hammer drill to rotation-only mode, while the 2-speed drivetrain enables users to choose between high speed (0-3000 rpm) and high torque (0-1000 rpm on the HD19-2 models and 0-900 rpm on the HD21-2) operation. Bosch also added an integral overload clutch and a 360Âº torque control side handle that work in tandem to minimize torque reaction on the user. The ball-joint cord turret enables the cord to pivot 35Âº for added flexibility.