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Drill America .40mm High Speed Steel Drill Bit (Pack of 12), DWD
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High-speed steel tools are good for most general purpose applications, offering a combination of hardness and toughness for wear resistance
Black oxide treatment adds lubricity and creates small pockets on the surface of the tool that act to hold coolant near the cutting edge
Round shanks allow use with a wide variety of toolholding systems
When run in a counterclockwise direction (right-hand cut) spiral fluted tools evacuate chips up and out of the cut to reduce clogging
Ideal for production, maintenance or portable drilling jobs
Drill America black oxide series high speed drill bit is a dependable, general purpose drill designed to perform in a broad range of materials in the iron and steel families. Ideal for production, maintenance or portable drilling jobs. Surface treated with abrasion-resistant black oxide.Black oxide treatment adds lubricity and creates small pockets on the surface of the tool that act to hold coolant near the cutting edge. Round shanks allow use with a wide var
From the manufacturer
General Purpose High Speed Steel Drill Bit
Drill America black oxide high-speed steel drill bits are good for most general purpose applications, offering a combination of hardness and toughness for wear resistance.
Black Oxide Surface Treateed
Black oxide treatment adds lubricity and creates small pockets on the surface of the tool that act to hold coolant near the cutting edge.
Versatile for Many Uses
For use in a wide range of materials in the ironand steel families such aluminum, iron, copper, brass and metal.
Easy to Hold Round Shank
Drill America black oxide high speed steel drill bits have a round shank for use with a wide variety of toolholding systems.
These bits are absolute crap. I will assume they are foreign made. I broke 4 bits on about 8 holes. One bit didn't even get to complete hole. Another bent while drilling. I was drilling through a 2x4 then into a 17 gauge, standard 2 -3/8 inch metal post. Another 'K' drill bit that I was previous using ( that I believe was American made) , made it through at least a hundred holes before I had to change it out because it got dull. These drills bit will never see a dull edge because they break long before they can go dull. If you are drilling only wood, okay, anything else, do not buy these.These drills are a good value for the price, and the finish and grind appears to be superb, but some are mislabeled. The outer package was labeled 4.85mm but the drills themselves were etched with #11, which is a wire gauge size. The difference is 0.19094" vs 0.1910" (4.85mm vs 4.8514mm) so it is probably insignificant for most people, but I ordered 4.85mm because I specifically wanted something slightly less than #11. Also, it has a split-point and appears to be 135 degrees, not 118 degrees. I actually prefer that type of point, so I'll keep these drills, but if these differences are important to you keep that in mind before ordering.
I purchased these for sheet metal work. So far they are all Out of round and the tip angle varies too much for any precision. If you don’t mine the bit walking across the metal, they will work ok. The cutting edge also seems dull. I switched to a different brand HSS #40 and it was like night and day. And the price on those were nearly the same as these.
This set of drill bits is really 7/128", 1/128" shy of 1/16"; not even close to 1/32". Buy something else!
We bought these to drill holes through knife handles and needless to say they did not drill through the steel. It was not hardened yet, and these bits just spun around and didn't even attempt to dig in. I'm sure they would work fine on wood or other thinner metals, but would not recommend for steel.After breaking one off in a work piece and not being able to get it out. had to scrap my work. Then went through 3 more trying to drill into another work piece. The final 8 bits in the pack went in the trash! two things are worth noting her. 1. I'm a fabricator with 20 yrs. experience. And 2. The work piece was 7075 T6 aluminum.
Being "High Speed Steel" I expected these to last through multiple hole drillings, but out of the 12 of them I had four shatter on me while drilling their first hole, initially they had trouble even getting through a 2x6 Douglas Fir board, and then through 3/16" angle iron which took far far longer than it should have and I had to push hard, DO NOT buy these.
I ordered 12, 3.05 mm drills and received three 3.05; six, 3.50 mm; and three 3.15 mm drills. Worse, most of each marked size drill is at least 0.001-inch (sometimes 0.0025-inch) undersize the marked size. Of the twelve drills, I got only one 3.05 mm drill that is on dimension. All were in a single envelope marked 3.05 mm. Obviously, packaging quality is poor but the fact that most are undersize is a more serious problem. These are low-quality drills and I recommend you avoid this brand drill altogether. Max 68% OFF Constructive Eating Set of 3 Garden Fairy Utensils for Toddlers, Discounts Store Online Power Hand Tools => Power Tool Parts Accessories => Power Drill Parts Accessories Purchase Enjoy Discount our ever-expanding product range includes the latest releases from global brands in:personal devices: mobile phones, tablets, and laptops.entertainment systems: tvs, sound systems, home assistants & home theatres home appliances: acs, refrigerators, washing machines, cooktops, dishwashers etc.cameras and accessories: dslr cameras and accessories - all at affordable prices Constructive Eating Set of 3 Garden Fairy Utensils for Toddlers,