4mm cobalt M35 metal drill bitsDrill stainless steel and harder metals easily:Heavy Duty Cobalt Drill BitsSuitable for drilling harder metals including stainless steelUsed by professionals and home improvement enthusiastsCan be resharpenedRockwell hardness C average of 66 certificationMoney Back GuaranteeClick here for Imperial drill bit sizesClick here for Metric drill bit sizes4mm Drill Bit for Metal – Durable, Accurate, and Built to PerformCut cleanly through steel, stainless, and aluminum with our 4mm drill bit for metal. M35 cobalt steel, 135° split point, and USA-backed quality.Engineered for Demanding Metal DrillingIf you're searching for a 4mm drill bit for metal that won’t let you down when drilling tough materials, look no further. Built from premium M35 cobalt steel, this bit offers excellent performance in hardened and abrasive metals. Whether you're working in a workshop, on-site, or at home, this bit delivers precise results time after time.Unlike softer HSS bits, cobalt bits stay sharp longer and are far less likely to overheat. The 135° split point design ensures quick penetration without the need for a pilot hole. It also minimizes walking, which is especially helpful when starting holes on curved or uneven surfaces.Ideal for a Range of MetalsYou can confidently use this 4mm cobalt drill bit on a wide variety of metals, including:Stainless steel (including 304 and 316 grades)Mild and hardened steelsCast iron and carbon steelBrass, bronze, and copperAluminum and alloy metalsTo increase lifespan and improve drilling efficiency, we recommend using TTP CUT-IT metal cutting paste—perfect for reducing friction and heat during drilling.Get the Best Drilling PerformanceNeed to fine-tune your drill speed and feed rate? Use our free Speeds & Feeds Calculator to find the perfect settings for your material and drill bit size. This ensures cleaner holes, reduced wear, and professional results with every job.Trusted by Metalworkers Across the USAThis 4mm drill bit for metal is a customer favorite. Why? Because it works. Professionals and hobbyists alike rely on it for its balance of toughness, precision, and long life. Check out our Customer Reviews PDF to see what others say after putting it to the test.We back every drill bit with a full money-back guarantee. If it doesn’t meet your expectations, we’ll make it right.SummaryThe 4mm drill bit for metal offers exceptional cutting performance, durability, and reliability. With its 135° split point and cobalt alloy construction, it's ideal for stainless steel, mild steel, and other tough metals. Combined with cutting paste and the right RPM settings, this bit will help you tackle demanding jobs with ease.
