{"product_id":"500a-29-pc-cobalt-drill-bit-set","title":"500A 29 PC Cobalt Drill Bit Set","description":"\u003ch2\u003eDRILLCO 500A 29-Piece Cobalt Drill Bit Set — High-Speed M42 Cobalt for Hard Materials\u003c\/h2\u003e\n\u003cp\u003eThe DRILLCO 500A is a 29-piece jobber-length cobalt drill bit set manufactured from premium grade M42 cobalt high-speed steel, engineered for heavy-duty drilling in hard, tough materials including stainless steel, titanium, and high-strength alloys. Built to NAS Type J aircraft specifications, this set covers sizes from 1\/16\" to 1\/2\" by 64ths, making it a comprehensive solution for contractors and trades professionals who regularly work with demanding materials. The 135° split-point geometry is self-centering, reducing thrust requirements and minimizing bit walk on curved or hard surfaces. A bronze surface treatment provides high lubricity, reducing chip build-up and extending bit life in harder metals and stainless steel applications.\u003c\/p\u003e\n\u003cimg src=\"https:\/\/images.salsify.com\/image\/upload\/s--VYR7lTNO--\/mop3s7mfebveetzonq7b.jpg\" style=\"max-width:100%;margin:16px 0;\"\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003cth\u003eDetails\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eDRILLCO\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eItem #\u003c\/td\u003e\n\u003ctd\u003e500A29\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUPC\u003c\/td\u003e\n\u003ctd\u003e045997491806\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCountry of Origin\u003c\/td\u003e\n\u003ctd\u003eUnited States\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePiece Count\u003c\/td\u003e\n\u003ctd\u003e29 PC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSize Range\u003c\/td\u003e\n\u003ctd\u003e1\/16\" to 1\/2\" by 64ths\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaterial\u003c\/td\u003e\n\u003ctd\u003ePremium grade cobalt HSS (M42)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePoint Angle\u003c\/td\u003e\n\u003ctd\u003e135° split-point\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSurface Treatment\u003c\/td\u003e\n\u003ctd\u003eBronze (high lubricity)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSpecification\u003c\/td\u003e\n\u003ctd\u003eNAS Type J (Aircraft)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLength Type\u003c\/td\u003e\n\u003ctd\u003eJobber length\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eApplications\u003c\/td\u003e\n\u003ctd\u003eDrilling holes in high strength materials, heavy-duty drilling, drilling in stainless steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTechnical Tips\u003c\/td\u003e\n\u003ctd\u003eSpeed, feed, and lube are all critical to cutting tool performance\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cimg src=\"https:\/\/images.salsify.com\/image\/upload\/s--3Xv1mfin--\/nuzjvaodcinooo5iuomc.jpg\" style=\"max-width:100%;margin:16px 0;\"\u003e\n\u003cp\u003eCompared to standard HSS drill bits, the M42 cobalt construction of the 500A set delivers approximately 30% greater drilling speeds due to its high red hardness — meaning the material retains its hardness at elevated cutting temperatures. The NAS Type J aircraft specification and bronze surface treatment distinguish this set from general-purpose HSS options, making it the appropriate choice when working with stainless steel, titanium, and other high-strength alloys that would rapidly degrade standard HSS tooling.\u003c\/p\u003e\n\u003ch3\u003eKey Features \u0026amp; Benefits\u003c\/h3\u003e\n\u003ch4\u003ePremium Grade M42 Cobalt HSS Construction\u003c\/h4\u003e\n\u003cp\u003eM42 cobalt high-speed steel offers superior red hardness compared to standard HSS, allowing the drill to maintain its cutting edge at the elevated temperatures generated when drilling hard and tough materials. This translates directly to longer tool life and fewer bit changes on the job site. Cobalt drills can drill approximately 30% faster than HSS drills in demanding applications.\u003c\/p\u003e\n\u003ch4\u003e135° Self-Centering Split-Point\u003c\/h4\u003e\n\u003cp\u003eThe 135° split-point geometry is self-centering, which reduces the need for a center punch and minimizes bit walk on hard or curved surfaces. Reduced thrust requirements mean less operator fatigue and lower risk of bit breakage when drilling into high-strength materials. This point design is particularly effective for hand-drilling applications on harder materials.\u003c\/p\u003e\n\u003ch4\u003eBronze Surface Treatment for High Lubricity\u003c\/h4\u003e\n\u003cp\u003eThe bronze surface treatment increases lubricity and bit life while reducing chip build-up during cutting. This is especially beneficial when drilling stainless steel and other hard metals where heat and friction are primary causes of premature tool failure. The treatment is specifically suited for performance on harder metals and stainless steel.\u003c\/p\u003e\n\u003ch4\u003eNAS Type J Aircraft Specification\u003c\/h4\u003e\n\u003cp\u003eBuilt to NAS Type J aircraft specifications, these bits meet the heavy-duty construction standards required for aerospace-grade drilling applications. This specification provides contractors with confidence that the tooling is manufactured to a recognized, rigorous standard for use in demanding environments.\u003c\/p\u003e\n\u003ch4\u003eJobber Length for Versatile Reach\u003c\/h4\u003e\n\u003cp\u003eJobber length is the most common drill length because it provides extra reach while remaining suitable for the majority of drilling applications. This makes the 500A set a practical all-around solution for contractors who need a single set capable of handling most job site scenarios.\u003c\/p\u003e\n\u003ch4\u003eComprehensive 29-Piece Size Range\u003c\/h4\u003e\n\u003cp\u003eThe set covers 1\/16\" to 1\/2\" by 64ths, providing a complete progression of sizes for a wide variety of hole diameters in a single kit. Having every size from 1\/16\" to 1\/2\" on hand eliminates the need to source individual bits for common drilling tasks.\u003c\/p\u003e\n\u003cimg src=\"https:\/\/images.salsify.com\/image\/upload\/s--FPF4RW-O--\/prsafhx6ctpdaohbaagd.jpg\" style=\"max-width:100%;margin:16px 0;\"\u003e\n\u003ch3\u003eCommon Applications\u003c\/h3\u003e\n\u003ch4\u003eDrilling in Stainless Steel\u003c\/h4\u003e\n\u003cp\u003eThe M42 cobalt construction and bronze surface treatment are specifically suited for drilling stainless steel, where heat generation and work hardening rapidly degrade standard HSS bits.\u003c\/p\u003e\n\u003ch4\u003eDrilling in Titanium\u003c\/h4\u003e\n\u003cp\u003eTitanium's combination of high strength and low thermal conductivity makes it one of the most demanding materials to drill; the high red hardness of M42 cobalt maintains cutting performance under these conditions.\u003c\/p\u003e\n\u003ch4\u003eHigh-Strength Alloy Drilling\u003c\/h4\u003e\n\u003cp\u003eFor high-strength steel alloys and other tough materials encountered in structural, industrial, and fabrication work, the cobalt substrate and NAS Type J specification ensure reliable performance where general-purpose HSS tooling would fail prematurely.\u003c\/p\u003e\n\u003ch4\u003eHeavy-Duty Drilling Operations\u003c\/h4\u003e\n\u003cp\u003eThe heavy-duty construction and aircraft-grade specification make this set appropriate for sustained, high-demand drilling tasks where tool longevity and consistent performance are critical.\u003c\/p\u003e\n\u003ch3\u003eCompatible Materials\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eStainless steel\u003c\/li\u003e\n\u003cli\u003eTitanium\u003c\/li\u003e\n\u003cli\u003eHigh-strength steel alloys\u003c\/li\u003e\n\u003cli\u003eHard, tough metals\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eProduct Documents\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0551\/8396\/6382\/files\/zdthzlg6jaigvlhnd5ps.pdf?v=1793217026\" target=\"_blank\" rel=\"noopener\"\u003eSafety Data Sheet (SDS)\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0551\/8396\/6382\/files\/cinakvujelpexceens0b_134d85ca-e35c-429e-9c34-c5858bc35999.pdf?v=1793217026\" target=\"_blank\" rel=\"noopener\"\u003eDRILLCO Product Linecard\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eSafety Data Summary\u003c\/h3\u003e\n\u003ch4\u003eHazard Information\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eDuring normal operation, cobalt cutting tools do not present inhalation, ingestion, or other chemical hazards.\u003c\/li\u003e\n\u003cli\u003eGrinding, cutting, machining, burning, or welding may release dusts, fumes, or vapors that present health hazards if exposure limits are exceeded.\u003c\/li\u003e\n\u003cli\u003eExcessive inhalation of metallic fumes and dusts may cause irritation of eyes, nose, and throat.\u003c\/li\u003e\n\u003cli\u003eHigh concentrations of fumes and dusts of iron oxide, manganese, copper, zinc, and lead may result in metal fume fever (metallic taste, throat irritation, chills, fever — symptoms may persist 12–48 hours).\u003c\/li\u003e\n\u003cli\u003eChronic exposure to cobalt dusts, fumes, and mists may cause permanent respiratory diseases including occupational asthma, interstitial pneumonitis and fibrosis (hard-metal disease), and emphysema.\u003c\/li\u003e\n\u003cli\u003eChromium and nickel are listed as carcinogens by NTP and OSHA; cobalt is listed as Group 2B by IARC (possibly carcinogenic to humans).\u003c\/li\u003e\n\u003cli\u003eSkin contact with dust may cause irritation or allergic skin rash due to cobalt sensitization.\u003c\/li\u003e\n\u003cli\u003eEye contact with dust may cause irritation.\u003c\/li\u003e\n\u003cli\u003eFine metal particles produced when ground or sawed can burn; high concentrations in air may present an explosion hazard.\u003c\/li\u003e\n\u003cli\u003eNFPA Hazard Rating: Health 1; Flammability 0; Reactivity 0\u003c\/li\u003e\n\u003cli\u003eCalifornia Proposition 65 Warning: This product can expose you to chemicals including Cobalt, which is known to the State of California to cause cancer. For more information go to www.P65Warnings.ca.gov\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003ePersonal Protective Equipment\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eWear safety glasses or goggles with side shields; do not wear contact lenses when handling these materials.\u003c\/li\u003e\n\u003cli\u003eCloth or leather gloves recommended when contact with dust or mist is likely.\u003c\/li\u003e\n\u003cli\u003eUse an appropriate NIOSH-approved respirator if airborne dust concentration exceeds the applicable PEL or TLV.\u003c\/li\u003e\n\u003cli\u003eHearing protection may be required.\u003c\/li\u003e\n\u003cli\u003eAlways use machine guards and wear protective clothing to prevent injury in the event of tool breakage.\u003c\/li\u003e\n\u003cli\u003eEmployer should provide an eye wash station within the immediate work area for emergency use.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eSafe Handling\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003ePerform grinding, cutting, and machining operations in well-ventilated areas; use local exhaust ventilation adequate to limit airborne dust below PEL or TLV.\u003c\/li\u003e\n\u003cli\u003eClean up using methods that avoid dust generation: vacuum with appropriate filters, wet dust mop, or wet clean-up.\u003c\/li\u003e\n\u003cli\u003eWash hands thoroughly after handling and before eating or smoking; wash exposed skin at end of work shift.\u003c\/li\u003e\n\u003cli\u003eDo not shake clothing, rags, or other items to remove dust — remove dust by washing or vacuuming with appropriate filters.\u003c\/li\u003e\n\u003cli\u003eStore in a dry place in a manner that prevents accidental environmental contamination from traces of industrial lubricants or wetting oils.\u003c\/li\u003e\n\u003cli\u003eSoiled clothing should be laundered separately.\u003c\/li\u003e\n\u003cli\u003eIncompatible with strong acids and strong oxidizers.\u003c\/li\u003e\n\u003cli\u003eFor powder fires: smother with dry sand, dry dolomite, ABC-type fire extinguisher, or flood with water. Use NIOSH-approved respirator for toxic dusts and fumes; use self-contained breathing apparatus for large fires.\u003c\/li\u003e\n\u003cli\u003eIf inhalation symptoms develop (coughing, wheezing, shortness of breath), remove from exposure and seek medical attention.\u003c\/li\u003e\n\u003cli\u003eIf skin irritation or rash occurs, wash thoroughly with soap and water; seek medical attention if it persists.\u003c\/li\u003e\n\u003cli\u003eIf eye irritation occurs, flush with copious amounts of water; seek medical attention if it persists.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Why choose cobalt (M42) drill bits over standard HSS bits for stainless steel?\u003c\/strong\u003e\u003cbr\u003eA: M42 cobalt HSS has higher red hardness than standard HSS, meaning it retains its cutting edge at the elevated temperatures generated when drilling stainless steel and other hard alloys. Cobalt drills can drill approximately 30% faster than HSS drills in these demanding materials, and the bronze surface treatment further reduces heat and chip build-up.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: What does the 135° split-point offer compared to a conventional 118° point?\u003c\/strong\u003e\u003cbr\u003eA: The 135° split-point is self-centering, which reduces bit walk on hard or curved surfaces and lowers thrust requirements. This makes it particularly well-suited for hand-drilling on harder materials where a conventional point would tend to skate before engaging.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: What does NAS Type J specification mean for this drill set?\u003c\/strong\u003e\u003cbr\u003eA: NAS Type J is an aircraft-grade specification for heavy-duty drill construction. Meeting this standard indicates the bits are built to rigorous dimensional and material requirements suitable for demanding aerospace and industrial drilling applications.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: What size range does the 500A29 set cover?\u003c\/strong\u003e\u003cbr\u003eA: The set includes 29 pieces covering 1\/16\" to 1\/2\" by 64ths, providing a complete progression of jobber-length cobalt drill sizes for a wide range of hole diameters.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: What role do speed, feed, and lubrication play when using these bits?\u003c\/strong\u003e\u003cbr\u003eA: According to DRILLCO, speed, feed, and lube are all critical to cutting tool performance. Using the correct combination for the material being drilled will maximize bit life and cutting efficiency; improper speed or insufficient lubrication are primary causes of premature tool wear in hard materials.\u003c\/p\u003e","brand":"Drillco","offers":[{"title":"Default Title","offer_id":67885628883118,"sku":"500A29","price":257.05,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0551\/8396\/6382\/files\/mop3s7mfebveetzonq7b.jpg?v=1793217031","url":"https:\/\/www.diamondtoolstore.com\/products\/500a-29-pc-cobalt-drill-bit-set","provider":"Diamond Tool Store","version":"1.0","type":"link"}