HD21-2 Two-Speed Hammer Drill

Two-Speed Hammer Drill

Product Description


The Bosch HD21-2 2 speed hammer drill features a torque control auxiliary handle. This securely locks into place for maximum control in heavy duty drilling applications. It has a 2-speed gear box. This allows the user to match the speed to the application. This gives you either the power or precision necessary.


  • (1) HD21-2 Two-Speed Hammer Drill
  • (1) 360° Auxiliary Handle
  • (1) Depth Gauge
  • (1) Chuck Key
  • (1) Carrying Case
HD21-2 Two-Speed Hammer Drill

Technical Data


Amperage 9.2
Chuck Design Keyed
Chuck Size 1/2 in
Height 9.0"
Length 13.5"
Max. Capacity in Concrete 7/8"
Max. Capacity in Wood 1-5/8"
No Load BPM 0-15,300 / 0-51,000
No Load RPM 0-900 / 0-3,000
Rating 120 V
Voltage 120V
Weight 5.9lb
Width 3.0"
Includes (1) HD21-2 Two-Speed Hammer Drill, (1) 360° Auxiliary Handle, (1) Depth Gauge, (1) Chuck Key, (1) Carrying Case


  • Powerful 9.2-amp motor – for high-torque and high-speed drilling capabilities
  • Auxiliary handle with built-in depth gauge – securely locks into place and provides consistent drilling depth
  • Integral slip clutch – more user security because it disengages the output shaft should the bit get into a bind situation
  • Rotating brush plate – delivers extended brush life and provides equal power in forward and reverse
  • Securely clamping, 1/2 In. three-jaw chuck — for rugged hammer-drilling applications
  • Dual-mode selector – easily converts from rotation-only to hammer-drill mode
  • Pistol-grip handle – includes a compact ergonomic design with soft-grip
  • Variable-speed reversing trigger — for accurate bit starting, as well as removing fasteners or bound bits
  • Metal gear housing — for long life and rugged jobsite durability
  • Two speeds – high speed for concrete, high torque for drilling in wood and metal
  • Works with Bosch PRO+GUARD™ dust solutions – an end-to-end dust-collection system that helps users move toward OSHA Silica Table 1 dust compliance