{"product_id":"cobalt-heavy-duty-drill-bit-pack-of-12-durable-jobber-length","title":"Cobalt Heavy Duty Drill Bit Pack of 12 - Durable Jobber Length","description":"\u003cp\u003eOur review of the Drill America #74 Cobalt Heavy Duty Drill Bit pack finds it best for machinists, metalworkers and serious DIYers who regularly drill tough alloys. The bottom line: these are heavy duty jobber length bits made from cobalt steel that stay sharp and cut harder metals like stainless, inconel and titanium more reliably than standard high-speed steel bits. For anyone needing longer life and higher cutting speeds without exotic coatings, this pack delivers consistent performance and value for money.\u003c\/p\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCobalt steel construction:\u003c\/strong\u003e delivers higher red hardness so the bits run up to about 30 percent faster and hold an edge when cutting high tensile materials.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGold oxide finish:\u003c\/strong\u003e provides a thinner surface treatment than black oxide while maintaining similar cutting performance and simplified identification of cobalt tools.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRound shank:\u003c\/strong\u003e fits a wide variety of toolholding systems so the bits can be used in many drill chucks and holders without adapters.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRight-hand spiral flute:\u003c\/strong\u003e evacuates chips up and out of the hole to reduce clogging and keep cuts clean in deep or long drilling operations.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e118 degree point:\u003c\/strong\u003e offers a versatile, standard tip geometry that centers well and performs across common shop materials and tasks.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufactured to NAS 907:\u003c\/strong\u003e built to a national aerospace standard that supports consistent dimensions and reliability for demanding applications.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWho It's For\u003c\/h2\u003e\n\u003cp\u003eThese drill bits are ideal for professionals and hobbyists who work with hard, heat-resistant metals such as PH stainless steel, nickel alloys, inconel and titanium, where longer tool life and higher operating speeds matter. The pack format suits busy shops that want consistent replacements without mixing sizes from different makers.\u003c\/p\u003e\n\u003cp\u003eUsers who mainly drill wood or soft plastics and those looking specifically for coated performance gains (like TiN coatings for reduced friction) may prefer specialized bits designed for those materials; likewise casual users who rarely drill metal may find standard high-speed steel bits adequate and more economical.\u003c\/p\u003e\n\u003ch2\u003ePros \u0026amp; Cons\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003ePros\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eExcellent durability and sharpness retained over many holes, giving strong long-term value.\u003c\/li\u003e\n\u003cli\u003ePerforms well on tough alloys and high tensile materials where HSS would struggle.\u003c\/li\u003e\n\u003cli\u003eRound shanks and standard points make the bits versatile across common drill setups.\u003c\/li\u003e\n\u003cli\u003eManufactured to aerospace standard for consistent quality and sizing.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eCons\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eGold oxide is a thin finish and does not provide the same lubricity or wear resistance as thicker coatings, so users should still use proper speeds and lubrication when drilling hard metals.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003eSeries\u003c\/td\u003e\n\u003ctd\u003eD\/ACO cobalt heavy duty\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaterial\u003c\/td\u003e\n\u003ctd\u003eCobalt steel (heat resistant)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePoint angle\u003c\/td\u003e\n\u003ctd\u003e118 degrees standard\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFinish\u003c\/td\u003e\n\u003ctd\u003eGold oxide surface treatment\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eShank type\u003c\/td\u003e\n\u003ctd\u003eRound shank\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStandards\u003c\/td\u003e\n\u003ctd\u003eManufactured to National Aerospace standard 907\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003ch2\u003eOur Verdict\u003c\/h2\u003e\n\u003cp\u003eThese Drill America cobalt jobber bits are a sound purchase for anyone who frequently drills hardened or heat-resistant metals and needs reliable, long-lasting cutting performance. They strike a practical balance of durability, versatility and value for money, especially for metalworkers who want higher speeds and longer tool life than standard HSS offers.\u003c\/p\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eAre these bits suitable for stainless steel?\u003c\/strong\u003e\u003cbr\u003eYes. The cobalt steel composition and higher red hardness make them well suited to stainless and other tough alloys when used with correct speed and lubrication.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDo these have a special coating?\u003c\/strong\u003e\u003cbr\u003eThe bits have a gold oxide surface treatment, which is a thinner oxide finish used primarily for identification and basic corrosion resistance rather than a thick wear-reducing coating.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat shank fits my drill?\u003c\/strong\u003e\u003cbr\u003eThey have round shanks, which fit most standard chucks and toolholding systems but may require an adapter for keyed collets or quick-change hex chucks.\u003c\/p\u003e","brand":"Drill America","offers":[{"title":"Default Title","offer_id":48256000164059,"sku":"B00FX6Y2FA","price":35.63,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0724\/1043\/1707\/files\/71bfcGlQTwL._SL1500_13d6b79e-8a5c-4bb2-8aab-4c6c7fb6bc33.jpg?v=1778319158","url":"https:\/\/gearmusthave.com\/products\/cobalt-heavy-duty-drill-bit-pack-of-12-durable-jobber-length","provider":"GearMustHave","version":"1.0","type":"link"}