{"product_id":"hertel-66693912-jobber-drill-bit-letter-r-hss-tin","title":"Hertel 66693912 Jobber Drill Bit Letter R Hss Tin","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe HERTEL 66693912 is a letter R jobber-length drill bit designed for general-purpose holemaking in metal, wood, and composite materials. Built from high speed steel (HSS) with a titanium nitride (TiN) coating, it delivers extended wear resistance and reduced friction during cutting. The 135-degree split point geometry allows self-centering on contact, reducing the need for a center punch on most surfaces. With an overall length of 4.75 inches and a flute length of 3.4375 inches, this drill fits standard jobber applications. It is suited for use in hand-held drills, drill presses, and CNC holemaking setups where letter-size tooling is specified.\u003c\/p\u003e\u003cp\u003eThis drill bit is intended for trade and industrial holemaking tasks requiring a 0.3390-inch diameter hole. The straight-cylindrical shank seats in standard 3-jaw chucks without adapters. The regular spiral flute and tapered web configuration support chip evacuation during drilling. Web thinning at the tip reduces thrust load, which is useful when working with harder alloys or thicker stock. Maintenance technicians, pipefitters, fabricators, and general machinists will find this drill suited for layout and assembly work where precise hole diameter is required.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eLetter R sizing at 0.3390 inches decimal equivalent for precise hole diameter control\u003c\/li\u003e\n\u003cli\u003e135-degree split point with web thinning for self-centering and reduced thrust\u003c\/li\u003e\n\u003cli\u003eTiN coating extends tool life and reduces heat buildup at the cutting edge\u003c\/li\u003e\n\u003cli\u003eHigh speed steel construction rated for heavy-duty drill bit grade per NAS specification\u003c\/li\u003e\n\u003cli\u003eRegular spiral flute with tapered web promotes consistent chip evacuation\u003c\/li\u003e\n\u003cli\u003eStraight-cylindrical shank compatible with standard 3-jaw drill chucks\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned as a jobber-length replacement drill bit for applications requiring a 0.3390-inch diameter straight-shank drill in the 0.3000 to 0.3500 inch size range, conforming to NAS specification designation.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eInstallation is performed by machinists, maintenance technicians, or trade professionals using a drill press, hand drill, or CNC spindle. Secure the straight shank fully in the chuck jaws before operation and verify runout before drilling into finished workpieces. Always wear appropriate eye protection and ensure the workpiece is clamped or fixtured before engaging the drill. Inspect the cutting edges and TiN coating for wear before each use and replace the bit if chipping or significant coating loss is observed.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrill Bit Size (Letter)\u003c\/strong\u003e: R\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrill Bit Size (Decimal Inch)\u003c\/strong\u003e: 0.3390 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrill Point Angle\u003c\/strong\u003e: 135 degrees\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePoint Type\u003c\/strong\u003e: Split\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCoating\/Finish\u003c\/strong\u003e: TiN (Titanium Nitride)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrill Bit Material\u003c\/strong\u003e: High Speed Steel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrill Bit Grade\u003c\/strong\u003e: Heavy Duty\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlute Type\u003c\/strong\u003e: Spiral\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpiral Type\u003c\/strong\u003e: Regular\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNumber of Flutes\u003c\/strong\u003e: 2\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlute Length\u003c\/strong\u003e: 3.4375 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOverall Length (OAL)\u003c\/strong\u003e: 4.75 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShank Type\u003c\/strong\u003e: Straight-Cylindrical\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShank Diameter\u003c\/strong\u003e: 0.3390 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCutting Direction\u003c\/strong\u003e: Right Hand\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeb Configuration\u003c\/strong\u003e: Tapered\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeb Thinning\u003c\/strong\u003e: Web-Thinned\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCoolant Through\u003c\/strong\u003e: No\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDouble Margin\u003c\/strong\u003e: No\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeries\u003c\/strong\u003e: Jobber\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecification Designation\u003c\/strong\u003e: NAS\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSize Range\u003c\/strong\u003e: 0.3000 to 0.3500 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTool Application\u003c\/strong\u003e: Holemaking\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.15 pounds\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eStandard Information\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand\u003c\/strong\u003e: HERTEL\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: 66693912\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"HERTEL","offers":[{"title":"Default Title","offer_id":51743141265714,"sku":"66693912","price":21.25,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/a70fed4595a187439f59d94f6dd81cf9.jpg?v=1788843168","url":"https:\/\/voomisupply.com\/products\/hertel-66693912-jobber-drill-bit-letter-r-hss-tin","provider":"Voomi Supply","version":"1.0","type":"link"}