800W Rotary Hammer

Now the number that actually defines this tool: 3J. That is the energy in a single blow, and it is the honest measure of a rotary hammer, far more telling than watts. A rotary hammer does not hammer the way the impact drill beside it does. There are no ratcheting discs; inside is a piston driving a cushion of air against a striker, and that striker hits the back of the bit. The blow is delivered to the bit itself rather than through the whole tool and your wrists, which is why a rotary hammer will go through concrete that stops a hammer drill dead, and why it does it without you leaning on it.

The speeds tell the same story from the other side. Rotation is 1180rpm, well under half the impact drill's, while the blow rate is 0 to 4600 per minute. That is the rotary hammer trade in plain terms: it turns slowly and hits hard. Concrete is broken, not cut, so the bit only needs to turn far enough to bring a fresh edge round to the next strike. Trying to drill concrete fast is how bits get burned.

The kit reflects a second job the tool does. Alongside three drill bits come two chisels — a rotary hammer with the rotation stopped becomes a light breaker. That covers chasing a channel for conduit across a plastered wall, opening up a block for a back box, lifting old tile beds and cutting through a slab edge for a pipe. On a small job that saves hiring a breaker for an afternoon's work.

A depth gauge and the manual complete the box. The depth gauge matters more here than on a plain drill: overrunning a hole in a hollow block means the anchor has nothing left to grip.

The buyers are building trades setting anchors and rebar dowels, electricians and plumbers chasing walls and slabs, air-conditioning and solar installers who core through walls all day, and maintenance crews on concrete structures. Hardware dealers who supply contractors carry it as the step above a hammer drill.

Two practical notes. Use bits made for a rotary hammer — the shank on this class of tool locks in and slides rather than being clamped, and an ordinary round-shank masonry bit is the wrong tool. And let the weight of the machine do the work: pushing harder on a rotary hammer slows it down, because the piston needs the bit free to recoil. Talk to us on WhatsApp for a price on the hammer, a transformer and a set of bits together.