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The result is that hammering drills are not as efficient and disperse the impact of each stroke. This is because with hammer drills the entire chuck is moved back and forth as opposed to just the drill bit in case of an SDS rotary hammer. While similar in main functions, the hammering action that is delivered is different. All this while the drill is still held securely so that it doesn’t fall out or loosen when rotated. This is because the drill can move back and forth inside the chuck in the same manner as a piston. SDS drill shanks are especially well suited for masonry drill that hammer into concrete and stone. It speeds up the process of drilling because less time is spent tightening and then retightening when the drill is being used. Once the shank goes inside, the spring-loaded chuck will secure it without the need for additional tightening. You simply place the shank of the SDS bit into the SDS holder, rotate it slightly to align the slots until you can push the bit in. SDS drills accomplish this by a combination of rotation and hammering, where the drill bit moves back and forth to punch through. They are designed mostly for construction, renovation, and demolition work that standard drills do not have the heft or power to do. The primary use of SDS drill is for punching through tough material. The SDS Max offers a modified profile that makes it perfect for bigger drills. Bosch calls this Special Direct System (SDS) or Spannen durch System in German. The slots allow the drill bit to move forward and back during the hammering action.ĭeveloped by Bosch and Hilti back in the 1970s, the original SDS drill was a mainstay until being replaced by the updated SDS Plus.The slotted drive ensures that the drill bit doesn’t slip inside the chuck.The SDS tool holder has two distinct advantages when compared to regular hammer drills with 3 jaw chucks. This means when it is placed in the drill, it creates a stronger connection which results in less tightening when being used. Standing for Slotted Drive System, an SDS drill bit has slots along the shank. Generally, a rotary hammer drill or roto hammer is called an SDS drill.
But the SDS drill changed the design to create a more secure connection. For decades, standard drill bits had to be tightened and retightened into the drill using a chuck key.