If you’re looking for a power tool that can crush concrete and masonry to a pulp but you’re unwilling to spend an arm and a leg on a high-quality jackhammer, then consider getting a rotary hammer instead. The rotary hammer is a lightweight, compact power tool that delivers tremendous amounts of power and speed for light- and medium-weight demolition tasks. Say you want to redo your bathroom tiles; the rotary hammer is the go-to tool for the job.
In this article, we’re going to take a look at two highly-rated rotary hammers from two industry giants – the DEWALT D25263K and the Bosch 11255VSR Rotary Hammer. Both of these models are 3-mode rotary hammers, meaning that they have a rotation-only mode (drilling), a hammer-drilling mode, and a hammering-only mode. They’re both lightweight and compact for getting into nooks and crannies. Without further ado, let’s compare the two.
Speed and Power
The best rotary hammers on the market should be able to deliver enough speed and power for a wide range of demolition and drilling applications. If you’re redoing your sidewalk or driveway, you need a tool that can cut through rebar with no hassle. The DEWALT delivers up to 1,450 RPM and 5,350 BPM (blows-per-minute) with an impact force of 3 joules. Hammering-only mode requires about 3 joules minimum to get most home projects done effectively, and we’re glad to say that the DEWALT delivers.
As for the Bosch’s 7.5 amp motor, it can perform up to 1,300 RPM and 5,800 BPM. The high BPM-count means that when hammer-drilling, it can cut through extremely tough materials like concrete, metal, and masonry with ease. It delivers around 2.7 joules which is enough for medium-level chiseling applications.
Conclusion: The Bosch delivers enough power for most drilling jobs for wood and concrete and has enough impact energy to complete most of your home DIY projects, but the DEWALT’s superior impact energy makes it the better tool of the two. With the DEWALT, you’ll be able to chisel your way through granite or concrete more efficiently than you would with the Bosch.
SDS-Plus Chuck Size
Both of these rotary hammers feature an SDS-Plus chuck for holding onto the drill, hammer-drill, and chisel bits without risk of losing them in the depths of whatever material you’re working on. The size of an SDS-Plus chuck ranges from 5/32 of an inch to 1-1/8 inches. Generally speaking, the larger the chuck, the more durable and effective the bit will be at drilling or hammering applications. The DEWALT’s chuck size fits the largest available size for SDS-Plus chucks – 1-1/8 inches – so you can bore wide holes quicker.
As for the Bosch, it features a ¾-inch SDS-Plus chuck. We’re now knocking the small size of the Bosch’s chuck. In fact, for most jobs at home and even commercial settings, ¾-inch chucks should be durable enough to withstand all sorts of punishment. Just remember that this unit can only hold onto the drill, hammer, and chisel bits of up to ¾ inches in diameter.
Conclusion: The general belief is that a large chuck requires a more powerful motor, and it’s true when looking at these two rotary hammer models. Not only does the DEWALT drill larger-sized holes easier, but it can bore all size holes that the Bosch can and more.
Both of these units are compact and lightweight so it’s understandable if there’s a little bit of vibration to them. Also, it’s in hammer-drilling and chiseling’s nature to cause a lot of vibrations, though it should never be too overbearing as to significantly hamper accuracy when boring holes. The DEWALT has a vibration rating of around 9.8 m/s2 thanks to DEWALT’s own Active Vibration Control technology which reduces vibrations by up to 50%. Considering how much power it delivers, especially when chiseling stones and concrete, we can live with its vibration rating.
The same goes for the Bosch, though it rumbles a little bit more than the DEWALT. It has a vibration rating of 10.6 m/s2. Looking at the high BPM-count, the vibrations are definitely something we can accept wholeheartedly.
Conclusion: Both of these entry-level rotary hammers have similar vibrating ratings, and honestly speaking, you’re not going to feel the difference between the two. However, if you’re a person who requires a rotary hammer that produces less bothersome vibrations while handling, between these two models, the DEWALT is the way to go.
Chisel Angle Position
When setting the rotary hammer to chisel mode (hammering-only mode), it’s important to get the angle of the chisel just right to produce clean chisel marks and finishes. There are two ways of doing this – either set the angle of the chisel just right and lock it in place using a built-in system or position your body and the unit to match the angle of your task. Unfortunately, you’re stuck with the latter if you get this DEWALT model. When swapping out drill bits for chisel bits, you can realign the chuck to fit the chisel bit either horizontally or vertically. There’s no in between.
As for the Bosch, thanks to its Vario-Lock positioning (unique to Bosch products only), you can set the angle of the chisel bit wherever you like. This means you don’t need to position your body in weird angles get to get the chisel perfectly aligned with whatever material you’re chiseling.
Conclusion: The Bosch wins by default, simply because DEWALT cannot implement the same Vario-Lock system that the Bosch has in most of their rotary hammer models. The lock system of the Bosch allows for an infinite number of angles to align your chisel bit too.
DEWALT D25263K vs Bosch 11255VSR: Bottom Line
Between the two models, we recommend getting the DEWALT D25263K. There’s no substitute for optimal power and speed for drilling long rebar into concrete. In addition, the third mode –hammering-only mode – is extremely effective in the DEWALT, whereas the hammering-only mode for chiseling with the Bosch is underpowered and requires patience when chiseling away somewhat weakly at rocks or concrete.
To reduce vibrations when chiseling or boring holes in concrete, DEWALT’s proprietary Active Vibration Control system reduces vibrations by up to 50% (compared several competing models on the market, not including the Bosch 11255VSR). If you’re looking for the best entry-level SDS-Plus rotary hammer on the market, the 1-1/8-inch SDS-Plus DEWALT D25263K could be the tool for you.