Spline shanks also have a slightly larger diameter of 19mm, and they are not compatible with SDS Max tools. Just like SDS Max bits, Spline bits are available for drilling holes up to 2 inches wide. Unlike SDS systems that use a spring-loaded mechanism, Spline shanks have 12 precisely ground teeth or splines that fit into the chuck with no play, and is afterwards secured by a retaining pin. Simply put, Spline chuck systems can handle a higher amount of drilling torque, and will hold up even in the heaviest of drilling workloads. Spline rotary hammer drill bits is an older standard, true, but it still offers a few benefits over the more modern SDS Max standard. The shanks themselves have a diameter of 18 mm, which offers plenty of supporting material for the biggest bits you can ever find for your rotary tool.
SDS Max shanks have five indentations, three of them open ended. SDS Max bits are on the larger side of things, and in this range, you will find drill bits up to 2 inches in diameter becoming available. SDS Max retains the easy bit changing features of the SDS system, while also offering higher torque tolerance. SDS Max first started as an alternative to the older Spline chuck systems as the heavy-duty option for rotary hammers. Just like SDS bits, these also have a shank diameter of 10mm.
#ROTARY HAMMER PLUS#
SDS Plus rotary hammer bits have four indentations, two of them open ended. SDS Plus bits may also be labeled as TE-C bits, and they are now by far the most common in the market these days. That means if you already have a collection of older SDS bits, you can use them in your SDS Plus tool with no problems. The SDS Plus standard is an improvement over the older SDS system, offering more reliable connection with the tool while also being completely interchangeable with SDS. This lets the rotary hammer safely deliver more impact to the flat end compared to bits that are held rigidly in place like in the other tools. SDS rotary hammer bits have a shank with a diameter of 10 mm, which is held rather loosely by the spring-loaded chuck. In international markets, Bosch also calls it “Special Direct System”. The SDS in the name stands for “Steck, Dreh, Sitz” or Insert, Twist, Stay in the original German, and has taken over other standards due to the simple convenience of being able to load a drill bit with just one hand, without the use of tools. SDS rotary hammers are designed for drilling into concrete and masonry, and SDS itself is an older standard designed to be used for hammering applications. They can also use carbide core bits up to six inches in diameter – more importantly, they can equip the extra-long drill bits over a foot long. On the job site, though, the SDS Max or Spline rotary hammer is a more reliable option for drilling holes up to two inches wide. The bits for these tools have shanks with a diameter of 10 mm, just enough for shorter bits and smaller attachments. You either have a smaller SDS Plus compatible tool, or you have a heftier SDS Max or Spline machine.Ĭontractors on the go will usually have a smaller SDS Plus rotary hammer in their toolkit that lets them equip drill holes up to 1 and 1/8 inch wide, or use core bits up to 4 inches in diameter. When it comes to rotary hammers, your choice nowadays basically boils down to two basic sizes.
It was even more confusing in the old days of proprietary rotary hammer shank standards – nowadays, however, things have become more or less standardized along three or so of the most popular types.īetween SDS Plus, SDS Max and Spline, you will have an endless pick of various drill bits, core bits, chisels and spades that lets your tool drill, dig, chisel and hammer. It can get confusing as you try to figure out which bits work with the rotary hammer that you have, and then there’s the fact that you have to consider if it will be the best bit for the job. A rotary hammer can’t get any work done without one of the many drill bits and tool attachments available on the market.
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