{"product_id":"hertel-74131251-screw-machine-drill-bit-letter-n-cobalt","title":"Hertel 74131251 Screw Machine Drill Bit Letter N Cobalt","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe HERTEL 74131251 is a cobalt screw machine length drill bit sized to Letter N (0.3020 inches decimal equivalent) with a 135-degree split point and web-thinned geometry. Screw machine length bits are shorter than jobber length, which improves rigidity and reduces deflection in close-tolerance drilling applications. The split point geometry allows the bit to self-center on contact, eliminating the need for a center punch on most materials. Two regular spiral flutes provide efficient chip evacuation during through-hole and blind-hole work. This bit is used by machinists, tool-and-die techs, and maintenance professionals who need consistent, accurate holes in ferrous metals and stainless steel.\u003c\/p\u003e\u003cp\u003eScrew machine length cobalt bits are a standard choice in production environments, CNC machining centers, drill presses, and manual machine tools where heat buildup from hard or abrasive materials would degrade high-speed steel tooling. The shorter overall length of 2.8125 inches keeps the bit seated firmly in the chuck and reduces runout when drilling through steel, cast iron, stainless, and similar materials. The straight cylindrical shank is compatible with standard three-jaw drill chucks and collet-style tool holders across a wide range of machine spindles.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eLetter N size: 0.3020 inch decimal equivalent for precision fitment applications\u003c\/li\u003e\n\u003cli\u003e135-degree split point with web thinning for self-centering and reduced thrust force\u003c\/li\u003e\n\u003cli\u003eCobalt construction for heat resistance when drilling hard ferrous and stainless materials\u003c\/li\u003e\n\u003cli\u003eScrew machine (stub) length improves rigidity and reduces deflection versus jobber length\u003c\/li\u003e\n\u003cli\u003eRight-hand cut with regular spiral flutes for standard chip evacuation\u003c\/li\u003e\n\u003cli\u003eStraight cylindrical shank fits standard drill chucks and collet holders\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned as a direct-fit replacement or stock bit for standard three-jaw drill chucks and collet-style tool holders accepting a straight cylindrical shank in the 0.3000 to 0.3500 inch drill bit size range.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eThis bit is installed and serviced by machinists and maintenance technicians. Ensure the machine spindle is fully powered down and locked out before changing tooling. Seat the shank fully and evenly in the chuck or collet before tightening to prevent runout. Use appropriate cutting fluid for the workpiece material to extend tool life when drilling hard metals.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrill Bit Size\u003c\/strong\u003e: Letter N\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDecimal Equivalent\u003c\/strong\u003e: 0.3020 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePoint Angle\u003c\/strong\u003e: 135 degrees\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePoint Type\u003c\/strong\u003e: Split Point\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTool Material\u003c\/strong\u003e: Cobalt\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCoating\/Finish\u003c\/strong\u003e: Straw\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNumber of Flutes\u003c\/strong\u003e: 2\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlute Type\u003c\/strong\u003e: Regular Spiral\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeb Configuration\u003c\/strong\u003e: Parallel Web-Thinned\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCutting Direction\u003c\/strong\u003e: Right Hand\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShank Type\u003c\/strong\u003e: Straight Cylindrical\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOverall Length\u003c\/strong\u003e: 2.8125 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlute Length\u003c\/strong\u003e: 1.625 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCoolant Through\u003c\/strong\u003e: No\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeries\u003c\/strong\u003e: HSCO135\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.26 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUNSPSC Code\u003c\/strong\u003e: 23241635\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: 74131251\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"HERTEL","offers":[{"title":"Default Title","offer_id":51742615437618,"sku":"74131251","price":17.79,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/737b435eb84296d6bb0d6d3acf36bfed.jpg?v=1788838373","url":"https:\/\/voomisupply.com\/products\/hertel-74131251-screw-machine-drill-bit-letter-n-cobalt","provider":"Voomi Supply","version":"1.0","type":"link"}