M35 Grade Cobalt Steel Cobalt Drill Bits Are Not Made Of Pure Cobalt But Rather A Steel Alloy With Certain Percent Cobalt. The 5-Percent Alloy Is Known As M35 Grade. The Cobalt Increases The Strength Of The Steel And Makes It More Heat-Resistant. 135 Degree Split Point The Flater The Drill The Smaller The Chip Width. This Means Less Force Required To Remove Metal Compared With Lower Angles Like 90 And 118. This Is Important On Hard Stuff Because Your Power Requirements Are Already More Than Mild Steel So Making The Chip Load Less Helps. It Also Reduces Heat Since Less Surface Area Is Generating The Cut. Lowest Cost Per Hole Drilled Cobalt Drill Bits Are More Expensive Than Other Drill Bits But If You Regularly Drill Through Metal They Are A Good Investment Since They Tend To Last Longer. With An Extended Tool Life Migiwata Cobalt Drill Bits Will Give You The Lowest Cost Per Hole Drilled. For Drilling Stainless Steel This Set Of Migiwata 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 Too. Tests Shows That The M35 Cobalt Steel Drill Bits Can Penetrate A 5Mm-Thick 304 Stainless Steel Plate In 5 Seconds. Not For Hardened Steel M35 Grade Cobalt Drill Bits Are Not Suitable For Hardened Steel High Carbon Steel And Heat-Treated Steel. Please Buy Carbide Drill Bits To Drill These Materials. Cooling Liquid Required Please Use With Cooling Liquid To Prolong The Working Life Of The Drill Bits And To Avoid Overheating And Breakage. About Breakage It'S A Common Sense That Harder Stuffs Are More Brittle. While The 5% Cobalt Makes The Bits Much More Durable As Well As Giving Them An Abrasive Quality It Also Makes Them More Brittle Than Ordinary Hss Bits.
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