7/30/2023 0 Comments Cobalt step drill bits for metalThese drill bits eliminate the drill bit from grabbing the sheet metal as the drill begins to penetrate though the metal. I like the flats machined into shank of the drills that keep the bit from twisting in the drill chuck that you thought was tight. The Cobalt Step Drills are recommended for up to 14-gauge material. These bits are perfect for drilling up to 1 1/8” holes in instrument or control panels. The Milwaukee 3-Piece Cobalt Step Drill Bit Set is all you need to drill 1/8“ through 1 1/8“ diameter holes in stainless steel or mild steel sheet metal. More steps per bit.ĬONS: Shanks aren’t flatted all the way up. SUMMARY: A great set of step bits for mild and stainless sheet metal work. I think the cobalt worked much better than my Milwaukee HSS step bits. I drilled a couple of holes in thick-wall tubing with no issues at all. OPERATION: Except for being a pain to chuck in the drill due to the round part of the shaft the bits work well. This means you can’t just drop the bit in the drill and tighten the chuck. I spun a couple of bits out of the chuck before I noticed the rounded part. O The 3-flat shank is not cut all the way to the base of the drill bit body. 3-flat secure-grip shanks reduce bit slippage in the chuck.O Time will tell if the markings get covered or worn off. 2 steps with laser engraving for clear stop on size identification.O Not sure what that means since all my drills have high and low speed ranges. O That seems to be the general consensus on drilling in general. Use on low-speed in Stainless Steel and high speed for mild steel.They are also different that my regular twist drill point. The tips look about half the size of my Milwaukee HSS step drill bits. O It appears this is Milwaukee Tools name for the profile of their tip. Rapid Strike tip allows for 2X faster starts in stainless.The smaller step sizes take less meter per step, reducing the power needed and give more hole sized available per bit. O These bits have about twice the steps of my Milwaukee HSS step bits. Smaller steps for smoothest drilling experience.These bits seem to make a cleaner, cooler cut. O Drilling through thick-wall tubing I found the heat buildup was minimal. Elongated dual-flute design also offers users the best heat management.In stainless they also drill through 14 gauge with no problem. O In mild steel I was able to drill through thick-wall square tubing with no problem. I expect they will last me for years with my limited workload. Engineered to deliver up to 15X the life in stainless compared to current solutions and up to 1000 holes in mild steel.The chance to evaluate the 48-89-9291 bit set was too good to pass up.įIT AND FINISH: These bits have the same quality as my other Milwaukee cobalt bits and are on par to much better than my non-cobalt step bits.įEATURES: From the Home Depot page, with my comments as appropriate. But drilling larger holes in stainless is a problem because my cobalt bits only go to 1/2” diameter. You can be confident that you get great results with the money you pay for.SUMMARY: A VERY NICE STEP BIT SET FOR WORKING MILD AND STAINLESS STEEL.īACKGROUND: I have several Milwaukee step bits, and a set of Milwaukee cobalt drill bits for stainless steel work. It can do what conventional drill bits cannot. If you are set to do some metalworking projects, it would do you well to have a number of these bits at your disposal. Considering that these bits can create holes in varying sizes, they are a more practical choice of tool to have in your workshop. You can even do this all day long and you won’t notice a change in its sharpness and precision. Moreover, it can drill into hardened steel without a problem. They are best used at relatively low speed with lubricants. This means they are more durable and last longer than other types. Cobalt drill bits have higher heat resistance and Rockwell hardness. Tungsten, molybdenum, and chromium have their strengths but not equal to cobalt. This M35 cobalt step drill bit, for example, is classified better than drill bits that are made with other combinations. If that already changes your mind about your drill bit preferences, you should also know more about the compounds and treatment process these tools undergo. Unlike conventional drill bits that create holes in a single size from the periphery all the way through the material, a step drill bit can make larger holes without the risk of damaging the surface. The conical shape is for drilling small then gradually larger holes. Step drills are typically used to puncture holes on thinner materials like sheet metal. But if you have not, you are in for an eye-opening surprise. If you have had the experience of drilling using cobalt drill bit, you would know what we are talking about. Product Description M35 COBALT PRO HEAT TREATED STEP DRILL BITĭrilling through all types of materials will never be the same with an M35 Cobalt Pro heat-treated step drill bit.
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