{"product_id":"cobalt-heavy-duty-drill-bit-pack-of-12-jobber-length-performance","title":"Cobalt Heavy Duty Drill Bit Pack of 12 - Jobber Length Performance","description":"\u003cp\u003eIn this review the Drill America A Cobalt Heavy Duty Drill Bit pack is evaluated for metalworkers and serious DIYers who need durable bits for tough alloys. The bottom line: these jobber length cobalt drills are best for drilling stainless steel, nickel alloys and other high tensile materials where standard high-speed steel bits struggle. The reviewer found the set offers sharp, long-lasting cutting performance and heat resistance that lets users run higher speeds and maintain cleaner holes under heavy use.\u003c\/p\u003e\u003ch2\u003eKey Features\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCobalt construction:\u003c\/strong\u003e The higher cobalt content raises red hardness, allowing drills to hold cutting edges longer when working stainless steel, inconel and titanium.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGold oxide finish:\u003c\/strong\u003e A thin gold oxide surface treatment helps identify the bits and provides similar performance to uncoated tools while resisting minor corrosion.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRound shanks:\u003c\/strong\u003e Standard round shanks fit a wide variety of chucks and toolholding systems for flexibility in bench and portable drills.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRight-hand spiral flute:\u003c\/strong\u003e When run clockwise the spiral flutes evacuate chips up and out of the cut to reduce clogging during deep or continuous drilling.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufactured to NAS 907:\u003c\/strong\u003e Produced to National Aerospace standard 907 for consistent geometry and reliable performance in demanding applications.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eWho It's For\u003c\/h2\u003e\u003cp\u003eThe set is aimed at machinists, fabricators and hobbyists who regularly drill hard, high tensile metals and need tools that last longer than typical HSS bits. If you work with stainless steel, PH stainless, inconel or titanium, the cobalt composition and higher red hardness are practical advantages.\u003c\/p\u003e\u003cp\u003eUsers who only drill soft metals occasionally or want coated titanium nitride for reduced friction on softer materials might find these overkill. Also, those needing specialized shank types like hex or reduced-width should look for alternate sets tailored to their chucks.\u003c\/p\u003e\u003ch2\u003ePros \u0026amp; Cons\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003ePros\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eExcellent durability and edge retention compared with standard HSS bits, reducing replacement frequency.\u003c\/li\u003e\n\u003cli\u003ePerforms well on stainless and other tough alloys at higher cutting speeds due to heat-resistant cobalt.\u003c\/li\u003e\n\u003cli\u003eRound shanks and common jobber length make the set versatile for many drills and applications.\u003c\/li\u003e\n\u003cli\u003eManufacture to NAS 907 gives consistent geometry and reliable drill performance.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCons\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eGold oxide is a thin treatment and offers similar performance to uncoated tools, so users expecting a thick wear coating may be disappointed.\u003c\/li\u003e\n\u003cli\u003eAngle feedback from some users is mixed, suggesting care is needed to maintain the correct drilling angle for best results.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eSpecifications\u003c\/h2\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eDrill America\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\u003eFinish\u003c\/td\u003e\n\u003ctd\u003eGold oxide thin surface treatment\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLength\u003c\/td\u003e\n\u003ctd\u003eJobber length\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\u003ctr\u003e\n\u003ctd\u003ePack quantity\u003c\/td\u003e\n\u003ctd\u003e12\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003ch2\u003eOur Verdict\u003c\/h2\u003e\u003cp\u003eThe Drill America cobalt jobber set is a solid, value-oriented choice for anyone who needs dependable drill performance in hard metals. Its heat-resistant cobalt composition and consistent manufacture to NAS 907 make it a practical upgrade over HSS bits for stainless, inconel and similar alloys, offering good longevity and clean cuts for a reasonable price.\u003c\/p\u003e\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003eAre these suitable for stainless steel?\u003c\/strong\u003e\u003cbr\u003eYes. The cobalt composition and higher red hardness make them well suited to drilling stainless and other high tensile materials.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDo the bits come coated with TiN?\u003c\/strong\u003e\u003cbr\u003eNo. They have a thin gold oxide surface treatment which is not the same as a thick TiN wear coating but helps with identification and minor corrosion resistance.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill the round shanks fit standard chucks?\u003c\/strong\u003e\u003cbr\u003eYes. The round shanks are compatible with most drill chucks and common toolholding systems.\u003c\/p\u003e","brand":"Drill America","offers":[{"title":"Default Title","offer_id":48197461246171,"sku":"B00FX6YVHY","price":46.83,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0724\/1043\/1707\/files\/71bfcGlQTwL._SL1500_9965683c-70ac-4fba-ad1f-ecb24f5a8cb8.jpg?v=1770192393","url":"https:\/\/gearmusthave.com\/products\/cobalt-heavy-duty-drill-bit-pack-of-12-jobber-length-performance","provider":"GearMustHave","version":"1.0","type":"link"}