Model # HD21-2

Internet #202716959

Bosch 8.5 Amp 1/2 in. Corded 2-Speed Hammer Drill Kit


8.5 Amp 1/2 in. Corded 2-Speed Hammer Drill Kit

  • Works with PRO+GUARD system for OSHA Silica Table 1 compliance
  • 2 modes:rotation-only to hammer-drill mode
  • 2 speed settings: one for high speed and one for high torque
$16499 /each
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Frequently Bought Together

Product Overview

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. 1/2 in. 3-Jaw Chuck for rugged hammer drilling applications. Dual-mode Selector easily converts from rotation only to hammer drill mode. Patented rotating brush plate provides equal power in reverse to easily back out bound-up bits and doubles brush life. Integral Slip Clutch helps minimize torque reaction.

  • Metal gear housing for long life and rugged job site durability
  • 2-speeds for drilling in wood and metal
  • 360° auxiliary handle with built-in depth gauge for wide range of movement along with consistent drilling depth
  • Pistol-grip handles compact ergonomic design with soft-grip
  • Variable-speed reversing trigger for accurate bit starting, as well as removing fasteners or bound bits
  • Includes: 1/2 in. hammer drill, depth gauge and 360° auxiliary handle

  • Click here for more information on Electronic Recycling Programs

Info & Guides

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Name 10 Amp 1/2 in. Variable Speed Reversing Pistol-Grip Hammer Drill Kit 8.5 Amp 1/2 in. Corded 2-Speed Hammer Drill Kit 8.2-Amp 3/4 in. Hammer Drill with LED Light 6-Amp 3/4 in. 2-Speed Hammer Drill
Brand DEWALT Bosch Makita Makita
Ratings (9) (6) (4) (1)
Chuck Size 1/2 In. 1/2 In. 1/2 In. 3/4 In.
Power Tool Features Case Included,Second Handle Included,Variable Speed Case Included,Second Handle Included,Variable Speed Case Included,LED Light,Second Handle Included,Variable Speed Case Included,Second Handle Included,Variable Speed
Cordless/ Corded Corded Corded Corded Corded
Chuck Type Keyed Keyed Keyed Keyed
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Maximum hole diameter (in.)
Product Depth (in.)
15.8 in
Product Height (in.)
4.6 in
Product Width (in.)
14.6 in


Amperage (amps)
Blows per Minute
Chuck Size
1/2 In.
Chuck Type
Clamshell/Jam pot
Color Family
Cord Length (ft.)
Corded Tool Type
Hammer Drill
Cordless/ Corded
Drill/ Driver Type
Hammer Drill/ Driver
Forward/reverse switch
Forward switch and reverse switch
Maximum Speed (rpm)
Power Tool Features
Case Included,Second Handle Included,Variable Speed
Product Weight (lb.)
Tools Product Type
Power Tool
Variable Speed

Warranty / Certifications

Certifications and Listings
1-UL Listed
Manufacturer Warranty
1 Year

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Customer Questions & Answers

this is a drill "kit" does it come with drill bits?

Asked by: Anonymous
No dill bits provided. Does have a good quality blow molded case that is easy to use and has space inside to store bits. Some cases today once the tool is removed you have trouble getting them back in. That is not the case with this one.
Answered by: Bathexpert
Date published: 2015-09-20

120 or 220 v ? Thanks

Asked by: eddie
Thank you for your question. The HD21-2 is 120 volt.
Answered by: BoschTools
Date published: 2016-03-22

does this drill use an sds bit

Asked by: Anonymous
No it does not use sds bits. Wanted it to be able to punch holes with hole saws so purchased it with a chuck. We drill holes for remodeling baths and kitchens up to 6" and I like our work to look professional, and not hacked up.
Answered by: Bathexpert
Date published: 2015-09-20

Confusion on amps

HD specs say the amps are 8.5 but a competitor has the amps listed as 9.2. What is correct?
Asked by: Greylinghunter
Thank you for your question. The Bosch HD21-2 has an 8.5 amp motor.
Answered by: BoschTools
Date published: 2015-09-20
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Customer Reviews

8.5 Amp 1/2 in. Corded 2-Speed Hammer Drill Kit is rated 4.0 out of 5 by 6.
Rated 5 out of 5 by from Excellent Hammer Drill Bought mine a few months ago and noticed that it must be an updated version because it's 9.2 Amps..............a real little powerhouse! With good quality, sharp bits, it will go into masonry & concrete at a very reasonable rate short of using a rotary hammer drill for more demanding jobs. One reviewer said that his depth gauge wouldn't hold, but if it's put in correctly with the teeth facing the right way in the slot, it works just fine. Great little brute-of-a expected from Bosch.
Date published: 2014-05-18
Rated 5 out of 5 by from Built like a Battleship! Purchased for drilling into a 1950's brick & concrete porch which was badly "pitted" on it's top. Drilled 24 3/16" holes into the concrete top / sides to take 1/4" Tapcon anchors for the 2x6 sleepers we installed. Other than for changeing out the drill bit frequently so-as-to keep a sharp bit in action, we had no trouble what-so-ever. the HD21-2 drilled into the concrete "like going into butter". Friends & Family laughed at the fact that my wife & I were "still talking to each other" at the end of the project. I figure this hammer drill will last me the rest of my life with no need of replacement.
Date published: 2013-10-09
Rated 1 out of 5 by from Failed in less than an hour I purchased this drill based on reviews. With less than 1 hour of use, it appears that the gears stripped. I could hold the chuck with my hand, apply power, and the chuck would not move
Date published: 2015-04-25
Rated 4 out of 5 by from Tool has good weight and torqe unlike some models used We have used the drill twice now and it seems to be the one we have been looking for. The chuck uses a key so you can lock the drill or hole saw in and have it stay. Our experience with other name brand manufactures drills have been less than desirable.
Date published: 2014-01-14
Rated 4 out of 5 by from Would have been 5 stars Read the other positive reviews to see what to like. The depth gauge is the only poor feature... it consistently slipped with just the slightest pressure and was useless.
Date published: 2014-02-26
Rated 5 out of 5 by from great product, built to last no plastic here Good Hammer drill and good straight drill. Service and shipping were very good just as promised
Date published: 2014-02-11
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