Hollow core bits like Bosch’s Speed Clean make the process faster by collecting dust as you create it. There’s also the issue of diminishing returns-the performance benefits of these bits aren’t as great compared to the increase in cost.Īnytime you’re working in concrete, pay attention to OSHA’s silica dust regulations. According to the team at Bosch, it’s more difficult to pull off correctly compared to a solid carbide head.
We’re also seeing some manufacturers go to six or more cutting edges on larger bits. Most importantly, it chews through rebar without taking the damage that other bits do. It creates a stronger bond and lasts even longer than the four cutter head.
HAMMER DRILL BITS FULL
Bits like Bosch’s Speed Xtreme use a full carbide head instead of just carbide cutters. When you’re drilling in reinforced concrete, standard procedure has you swap to a rebar cutting bit to get through it, then back to a drilling bit to finish the hole. Kickback control helps prevent injury if your rotary hammer has it, but you can still damage either bit style on rebar. The four-cutter design lasts longer and is able to cut through rebar where a two-cutter head binds up. However, they are not designed to cut through rebar and often bind up when they hit it. Two-cutter bits are excellent for drilling fast in concrete. You see the single piece form in newer designs.Ĭonfused about carbide? Learn more here! 4 Edges are Better than 2 Another is to start with a single cross-shaped piece and embed it. One way to make it is to place two smaller cutters on either side of the original carbide chip, making three total pieces. Vacuum Attachment, SDS-Plus Hollow Dust Extraction. When you hear the term “embedded carbide,” it refers to that type of attachment process. Vacuum Attachment, SDS-Plus Hollow Dust Extraction Drill Bits E-07185. Once you mill out the steel, a carbide chip goes on the end to create the two cutting edges using a welding or braising process for the connection. Most rotary hammer bits use a two-cutter design. The connection types are different and not interchangeable, so be sure to buy the bit to match your hammer. In general, you move from SDS-Plus to SDS-Max as the hole diameter you need to drill increases, though there is plenty of overlap in the middle diameters.
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