Buy Bosch HD21-2 Speed Hammer Drill, BlueBosch HD21-2 Speed Hammer Drill, Blue Product Description:
- 9.2 Amp motor-best in class power provides maximum performance/durability for drilling in a wide variety of materials such as concrete, wood or metal
- 360 Degree torque control side handle with built-in quick release depth gauge-side handle
- Metal gear housing-for long life and jobsite durability the competition
- 2-Mode selector-easily converts from hammer drill mode to rotation only mode
- 2-Speed-Select high speed (concrete) or high torque (wood, metal) drilling applications
Product Description
Includes 9.2 Amp 1/2-in 2-Speed Hammer Drill - HD21-2, Depth Gauge - 1613001010
Customer Reviews
Most helpful customer reviews
8 of 8 people found the following review helpful.
Ridiculous
By Clyde Crashcup
I've been using a Milwaukee hammer drill for years - handed down to me by my father. The brushes finally gave in and I wasn't prepared to sink that kind of money into it. That old hammer drill did set my expectations high, as Milwaukee helped write the book on them.The Bosch HD21-2 took that old drill to school. What an incredible amount of power for any application - professional or home. Spot-on response for the trigger pressure-sensor (another reviewer took issue with not having a manual adjustment, but this is exponentially better). Two speeds in forward or reverse. Regular or hammer action in forward or reverse. A 1/2 inch chuck that will not budge and a chuck key that is perfectly sized so someone with big hands can use it with no problems. The reviews of the DeWalt mentioned the chuck loosening after awhile and apparently that is a forgivable act. Not in my house (that is the reason I grew to resent my old DeWalt cordless drill). This chuck will not budge until you ask it to.If you try to punish it when going through concrete or using a hole saw (I've tried 4" to 6" hole saws) it will not walk, jerk, vibrate, or try to break your arm off. And your hands and arms will feel like someone is rubbing them gently, not giving you a painful thrashing as was the case with my old Milwaukee (and many of the new drills I've tried). If people are considering another drill because it has more than 9.2 amps of power, you're kidding yourselves. If you need more power than this drill provides, it's time for a demolition or rotary hammer drill.I would highly recommend this to anyone. Precision tool, durable, high quality. Made at the Bosch plant in Switzerland (not China, or using Chinese parts and assembled in the US..... looking at you, Milwaukee)
6 of 6 people found the following review helpful.
READ THIS - Great drill, misleading pictures
By tmann
I ordered the HD21-2 expecting the drill shown in the picture (both on Amazon and on Bosch's website). However, the pictured product has features that the HD21-2 does not! The two features I am talking about are the locking trigger and the speed control knob built into the trigger. My belief that I was getting these features was a deciding factor in buying it - I intended on mixing a bunch of self-leveling concrete, and the trigger lock with the speed adjuster dial would be perfect for that.I saw the one reviewer for the HD21-2 mention that the drill he received was not the one pictured, but I thought to myself "he probably ordered the HD19-2 by mistake" and ignored that review. I was wrong.What's weird is that even the box of the product has the same picture, with these 2 features. However, when you open up the box, surprise! No trigger lock, no speed control dial, yet the model number IS HD21-2. If you want an accurate picture of what you are getting, look at the HD19-2 - the features are identical, but the HD21-2 has 9.2 amps (as opposed to 8.5 amps for the HD19-2).I called Bosch to complain about this / get an explanation, and the first-level support people were clueless, so I got bumped up to the "advanced support" line, and after some digging, they determined that there was a last-minute design change before releasing the product. They didn't seem to think there was a problem with having their website product description (and the product box) not match the actual product - they were unapologetic about the whole thing. I was a little taken aback by this, so I lectured the guy on how they are misleading people about their product. He said he would "escalate this issue" and "hopefully someone will fix it".All these annoyances aside, the drill is a monster. It feels like a jet engine spooling up in your hand. I only used it for mixing the previously-mentioned self-leveling concrete, which it excelled at.Another thing I wanted this drill for is to drive hole saws. Again, Bosch's documentation was crap, and their support people didn't have any info on what hole saw sizes this would drive. My concern wasn't so much with the power, but with the torque-limiting clutch and its ability to handle hole saws. I did a bunch of Internet reading (I tend to over-research everything) and determined the following.The limiting factors for using hole saws are:1) The torque/power output of the drill - The greater the torque / power output of the drill, the bigger the hole saw it can drive (subject to the limitations of factor #2). DeWalt has a pretty good write-up floating around on the internet about this.2) The lowest speed of the drill - The higher the drill's lowest RPM setting is, the smaller the hole saw it will be able to drive - I think this has to do with the recommended linear speed of the hole saw's blade. Imagine you have the same saw tooth pattern on 2 different sizes of hole saw. That tooth pattern would have been designed for optimal cutting at a particular linear speed. The lowest speed setting of drills is rated in RPMs - it doesn't matter what size of bit you have in the drill, it turns at the same number of revolutions per minute. Suppose we have a drill that operates at 600RPM (10 revolutions per second). A 2" diameter hole saw blade will (using 2*pi*radius) be traveling at a linear speed of roughly 63" per second in that drill. A 4" diameter hole saw in the same drill will be traveling a linear speed of roughly 126" per second. Now suppose that your drill's minimum speed is 1200RPM. Now your 2" hole saw's linear speed is 126" per second, and the 4" hole saw's is 251" per second. 251" per second is probably too fast for the hole saw's tooth pattern.Anyways, I convinced myself that this drill would probably be able to handle up to 4" or so hole saws without an issue.I am going to keep the drill, despite it not being what I was expecting when I bought it. I couldn't really find any alternatives that sounded better at the same ballpark price point. Milwaukee has a pretty good reputation, but I used to use a big Milwaukee hammer drill at work, and that thing was scary. When using hole saws, if it caught, I'm pretty sure it would break your arm, crush your hand, etc. if you weren't able to let go in time. The torque clutch on the Bosch sounds like a great idea for this reason.Plus, Bosch tools are generally very high quality. However, I am disappointed with their customer service in this instance, and their misleading product descriptions.
6 of 6 people found the following review helpful.Super Drill
By Greg Kochanov
This drill is incredible. I live in a building with concrete walls and with the hammer bit it goes through solid concrete like butter. It does make some noise, but that's expected from a hammer drill.Ever since my friends saw how well this drill works on concrete, I get calls to borrow it all the time and everyone loves how well it works.It's not a small nor a light drill, but what hammer drill is?I love the variable speed and I have used it with a cobalt bit to drill through solid 1/4" stainless steel (you have to go very slowly, otherwise you generate too much heat and risk breaking the bit).Overall, it's a great drill and I highly recommend it.
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