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Hymnorq M35 Grade HSS-CO 5/32 Inch Fractional Twist Drill Bit Set of 10pcs, Jobber Length Fully Ground Straight Shank, 5% Cobalt Heat Resistant, for Stainless Steel Cast Iron
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*Packaging of actual item may differ from photo shown
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Hymnorq M35 Grade HSS-CO 5/32 Inch Fractional Twist Features
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COBALT STEEL - Manufactured from M35 grade cobalt steel, with molybdenum and cobalt added to creates a hardened alloy, measuring Rockwell hardness up to 67, for much faster cutting and extra longer life span, ideal for repeated drilling in metalworking.
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FOR METALWORKING - Particularly successful in cutting through hard metals(hardness less than HRC38°) such as stainless steel and cast iron, although they can be used for softer materials like copper and aluminium, too. Not for hardened steel / high carbon steel. Try to adjust the RPM when it fails to penetrate.
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SELF CENTERING - The 135°quick-cut pilot split points are self-centering and can penetrate quickly with less pressure. The bits will not "walk" or "wander". Straight shank allows for firmly holding and accurate centering, fit for standard drill chucks and regular round collet chucks.
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10PC SET - The set includes 10pcs of 5/32 inch diameter M35 grade cobalt steel twist drill bits, packed in a convenient plastic case for easy taking to worksites. Manufactured to German DIN338 standard.
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DOWNLOADABLE USER GUIDE - We've summed up some tips of drilling metals, including a RPM chart for several common metals, based on our reviews and some articles on the internet. In most cases, our customers would get a much better result with these tips. Welcome to download.
About Hymnorq M35 Grade HSS-CO 5/32 Inch Fractional Twist
Quality HSS-CO Material and Great Craftmanship The cobalt drill bits are not made of pure cobalt, but rather a steel alloy with 5 percent cobalt, known as M35 grade cobalt steel. The cobalt increases the strength of the steel and makes it more heat-resistant; this is an important factor in drilling hard materials because the friction of metal against metal can produce high temperatures that damage the material or the drill bit. Hymnorq cobalt drill bits are manufactured by the European DIN338 standard, featuring fully ground, bright and smooth finish. Cobalt Steel Drill Bits for Use on Stainless Steel, Cast Iron and Other Metals This set of M35 cobalt steel drill bits are particularly successful in cutting through hard metals such as stainless steel and cast iron, although they can be used for softer materials, like aluminum, plastic and wood, too. Money-Saving Choice Cobalt drill bits are more expensive than drill bits of other materials (M2, HSS4341, HSS4241), but if you regularly drill through metal, they are a good investment since they tend to last longer. With an extended tool life, Hymnorq cobalt drill bits will give you the lowest cost per hole drilled. Jobber Length Metric Twist Drill Bit Set Of 10 Pcs Total Length: 79mm Working Lengh: 51mm Diameter: 5/32 inch Angle Point: 135 Degree Manufacturing Process: Fully Ground NOTICE: 1. Please use with cooling liquid to prolong the working life of the drill bits and to avoid overheating and breakage. 2. Recommended to use with a drill press. 3. To avoid accidents, please wear work gloves safety goggles and protective clothing when you drill. 4. M35 grade cobalt drill bits are NOT suitable for hardened steel, high carbon steel and heat-treated steel, based on the reviews of our customers.
