Q: What is the difference between SDS Plus and SDS Max rotary hammers?

SDS Plus and SDS Max are incompatible chuck standards — bits from one will not fit the other. SDS Plus is the standard for mid-range tools, handling bits up to 32mm diameter in concrete and covering the vast majority of trade and DIY applications. SDS Max uses a larger shank for professional heavy-duty work, supporting bits up to 50mm+ and delivering significantly higher impact energy. If you're drilling standard wall fixings or working in typical masonry, SDS Plus is almost certainly what you need. SDS Max is for demolition, core drilling and large-diameter holes in reinforced concrete.

Question 1

What is the difference between SDS Plus and SDS Max rotary hammers?

Accepted Answer

SDS Plus and SDS Max are incompatible chuck standards — bits from one will not fit the other. SDS Plus is the standard for mid-range tools, handling bits up to 32mm diameter in concrete and covering the vast majority of trade and DIY applications. SDS Max uses a larger shank for professional heavy-duty work, supporting bits up to 50mm+ and delivering significantly higher impact energy. If you're drilling standard wall fixings or working in typical masonry, SDS Plus is almost certainly what you need. SDS Max is for demolition, core drilling and large-diameter holes in reinforced concrete.

Question 2

Is a cordless rotary hammer as powerful as a corded one?

Accepted Answer

For most SDS Plus applications, a quality 18V cordless rotary hammer now matches corded performance — the Bosch GBH 18V-40 C, for example, delivers impact energy comparable to many mains-powered tools in its class. The real limitation is runtime: a 4.0Ah battery gives roughly 45–60 minutes of active drilling. For sustained heavy chiselling or all-day continuous use, a mains-powered tool remains more practical. If you're on a job site where cable management is a problem, cordless wins. If you're breaking up a concrete floor for hours at a stretch, plug in.

Question 3

What impact energy (joules) do I actually need?

Accepted Answer

For most domestic and light trade work, 2.0–2.5J is sufficient. Drilling 6–12mm holes in brick, block or standard concrete for wall fixings, cable runs or shelf brackets doesn't require anything heavier. Step up to 3.0–4.0J if you're regularly working in reinforced concrete or need to chisel as well as drill. Beyond 5.0J, you're into specialist demolition territory — heavy, expensive, and overkill for anything short of breaking out a concrete floor or drilling core holes above 40mm.

Question 4

Should I worry about vibration ratings when buying a rotary hammer?

Accepted Answer

Yes — especially if you'll be using the tool for more than 30 minutes at a time. UK regulations under the Control of Vibration at Work Regulations 2005 set a daily exposure action value of 2.5 m/s², which a budget rotary hammer can exceed in under an hour of use. Prolonged exposure causes hand-arm vibration syndrome (HAVS), a permanent and progressive condition. Active vibration damping systems — standard on Bosch and Makita tools from around 200 £ upwards — make a measurable difference. For occasional DIY use, this is less critical; for professional daily use, it's non-negotiable.

Question 5

Are budget rotary hammers from brands like Einhell worth buying in 2026?

Accepted Answer

Einhell tools are worth buying for occasional DIY use — but not for professional or prolonged work. The TC-RH 800 and the 18V cordless TE-HD range offer genuine SDS Plus functionality at a fraction of the cost of Bosch or Makita equivalents. The compromises are real though: higher vibration levels, less robust build quality, and limited after-sales support compared to the professional brands. If you're drilling a dozen wall plugs a year, Einhell makes complete sense. If you're on site every day, the false economy of a cheap tool becomes apparent quickly.

Question 6

What is the risk of buying a rotary hammer without a battery included?

Accepted Answer

Bare-tool listings (marked 'Solo' or 'body only') can look like bargains but require a compatible battery and charger, which can add 124 £ or more to the total cost. This is only good value if you already own batteries from the same brand's platform. Bosch 18V, Makita LXT and DeWALT XR batteries are not interchangeable. Always check whether the listing includes a battery before comparing prices — a 'Solo' Bosch at one price versus a kit with battery at a higher price may actually favour the kit.

Question 7

Which rotary hammer brands have the best after-sales support in the UK?

Accepted Answer

Bosch Professional and Makita offer the strongest after-sales networks in the UK, with authorised service centres across the country and readily available spare parts. DeWALT and Metabo are also well-supported. Bosch Professional tools typically come with a 3-year warranty when registered, which is competitive. Budget brands like Einhell offer a standard 2-year warranty but have fewer repair options if something goes wrong outside that period. For tools that will see heavy professional use, the service network matters as much as the purchase price.

Rotary Hammers Price Comparison

Einhell TE-RH 32 4F Kit 1250 W 4100 RPM SDS Plus

Einhell TE-HD 18/12 Li - Solo SDS Plus

Einhell TP-HD 18/26 D Li BL - Solo

Einhell TC-RH 620 4F 620 W SDS Plus

Einhell TC-RH 28 3F 950 W SDS Plus

Bosch GBH 18V-40 C Professional

Bosch GBH 18V-36 C Professional

Bosch GBH 2-28 F Professional

Bosch GBH 2-28 Professional

Bosch GBH 5-40 D Professional

Bosch GBH 3-28 DFR Professional

Bosch GBH 8-45 DV Professional

Bosch GBH 3-28 DFR Professional

Bosch GBH 2-28 Professional

Einhell TP-HD 18/26 Li BL - Solo

Bosch GBH 2-26 Professional

Bosch GBH 18V-45 C Professional

Bosch GBH 12-52 D Professional

Einhell TE-HD 18/20 Li - Solo SDS Plus

Rotary Hammers Price Comparison