{"product_id":"hertel-74131780-screw-machine-drill-bit-letter-d-cobalt","title":"Hertel 74131780 Screw Machine Drill Bit Letter D Cobalt","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe HERTEL 74131780 is a screw machine length drill bit sized to Letter D (0.2460 inches decimal equivalent), designed for high-performance drilling in tough materials. Built from cobalt steel and finished with a TiAlN coating, this bit handles elevated cutting temperatures and abrasive workpiece materials without premature edge wear. The 135-degree split point reduces walking on contact and lowers required thrust force, making it a practical choice for production drilling on manual or CNC machines. The web-thinned, parallel-web configuration supports efficient chip evacuation. Right-hand spiral flutes and a straight cylindrical shank make this bit compatible with standard drill chucks and collet systems.\u003c\/p\u003e\u003cp\u003eThis bit is suited for metalworking applications in machine shops, fabrication facilities, and maintenance environments. Its screw machine length profile  -  shorter overall length than a jobber bit  -  provides added rigidity and reduced deflection when drilling steel, stainless steel, cast iron, and other hard or work-hardening materials. The 2.5-inch overall length and 1.375-inch flute length keep the cutting zone compact, which is ideal for drilling operations on lathes, drill presses, and CNC machining centers where overhang must be minimized.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eLetter D size: 0.2460 inches decimal equivalent\u003c\/li\u003e\n\u003cli\u003eCobalt steel construction for heat and wear resistance in hard materials\u003c\/li\u003e\n\u003cli\u003eTiAlN coating extends tool life in high-speed and dry cutting applications\u003c\/li\u003e\n\u003cli\u003e135-degree split point reduces thrust and prevents bit walking\u003c\/li\u003e\n\u003cli\u003eWeb-thinned parallel web promotes efficient chip evacuation\u003c\/li\u003e\n\u003cli\u003eScrew machine length for added rigidity and reduced deflection\u003c\/li\u003e\n\u003cli\u003eRight-hand cut with straight cylindrical shank for standard chuck compatibility\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned as a direct-fit screw machine length drill bit for use in standard drill chucks and collet holders accepting a straight cylindrical shank in the 0.2000 to 0.2500 inch diameter range.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eInstallation and use should be performed by qualified machinists or tooling technicians familiar with cutting tool safety. Secure the shank fully in the chuck or collet and verify runout before beginning a cut. Follow the machine manufacturer and tooling supplier recommendations for speeds and feeds appropriate to the workpiece material. Inspect the cutting edge for wear or chipping before each use and replace if the edge is degraded.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrill Bit Size (Letter)\u003c\/strong\u003e: D\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrill Bit Size (Decimal Inch)\u003c\/strong\u003e: 0.2460 inches\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: TiAlN\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\u003eCutting Direction\u003c\/strong\u003e: Right Hand\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\u003eShank Type\u003c\/strong\u003e: Straight-Cylindrical\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOverall Length\u003c\/strong\u003e: 2.5 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlute Length\u003c\/strong\u003e: 1.375 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeb Thinning\u003c\/strong\u003e: Web-Thinned\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeb Configuration\u003c\/strong\u003e: Parallel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCoolant Through\u003c\/strong\u003e: No\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrill Bit Size Range\u003c\/strong\u003e: 0.2000 to 0.2500 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.32 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: 74131780\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"HERTEL","offers":[{"title":"Default Title","offer_id":51739718746418,"sku":"74131780","price":14.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/da8c4e24db4726a50ce49b9be62b21db.jpg?v=1788818195","url":"https:\/\/voomisupply.com\/products\/hertel-74131780-screw-machine-drill-bit-letter-d-cobalt","provider":"Voomi Supply","version":"1.0","type":"link"}