{"product_id":"chicago-latrobe-54104-cobalt-drill-bit-letter-d-0-2460-in","title":"Chicago-latrobe 54104 Cobalt Drill Bit Letter D 0.2460 in","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe CHICAGO-LATROBE 54104 is a cobalt jobber length drill bit sized to Letter D (0.2460 inches), designed for high-performance drilling in tough materials including stainless steel and alloy steels. Built to M42 cobalt high-speed steel construction and coated with titanium nitride (TiN), this bit delivers extended wear life and reduced heat buildup during cutting. The 135-degree split point geometry reduces walking at startup and lowers thrust requirements compared to a standard 118-degree point. With a 4.0-inch overall length and a 2-3\/4-inch spiral flute, this is a heavy-duty tool engineered for production and maintenance drilling environments where tooling consistency matters.\u003c\/p\u003e\n\u003cp\u003eThis drill bit is suited for metalworking applications in both shop and field environments. Its primary target materials are stainless steel and carbon and alloy steels, making it a practical choice for HVAC fabrication, pipefitting, electrical rough-in, and general mechanical trade work where hole quality and bit longevity are critical. The straight-cylindrical shank is compatible with standard drill chucks and quick-change holders. The Series 2550 designation indicates compliance with DIN 338 and NAS 907 Type J standards, confirming dimensional and performance consistency across the production run.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eM42 cobalt high-speed steel construction for heat and wear resistance in hard metals\u003c\/li\u003e\n  \u003cli\u003eTiN coating extends tool life and reduces friction at the cutting edge\u003c\/li\u003e\n  \u003cli\u003e135-degree split point reduces drill walking and lowers axial thrust force\u003c\/li\u003e\n  \u003cli\u003eRegular spiral flute with web-thinned, tapered web for improved chip evacuation\u003c\/li\u003e\n  \u003cli\u003eRight-hand cut with 2-flute spiral configuration for standard drilling operations\u003c\/li\u003e\n  \u003cli\u003eMeets DIN 338 and NAS 907 Type J standards for dimensional accuracy\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned as a direct-fit jobber length drill bit for use in standard 3-jaw chucks and quick-change drill chuck systems accepting a 0.2460-inch straight-cylindrical shank. Compliant with NAS 907 Type J and DIN 338 specifications.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eThis bit is installed and operated by machinists, pipefitters, and trade mechanics using standard drill presses, magnetic drills, or hand-held power drills. Secure the shank fully in the chuck before operation and verify chuck runout is within acceptable limits to protect the close-tolerance shank diameter. When drilling stainless steel, use appropriate cutting fluid and avoid dwelling at reduced feed rates, which can work-harden the material. Follow applicable shop safety standards and use proper eye and hand protection during all drilling operations.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\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\u003eMaterial Grade\u003c\/strong\u003e: M42 Cobalt High-Speed Steel\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCoating\u003c\/strong\u003e: Titanium Nitride (TiN)\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 Point, Web-Thinned\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFlute Type\u003c\/strong\u003e: Regular Spiral, 2 Flutes\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCutting Direction\u003c\/strong\u003e: Right Hand\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOverall Length\u003c\/strong\u003e: 4.0 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFlute Length\u003c\/strong\u003e: 2.75 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: 0.2460 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eShank Length\u003c\/strong\u003e: 1.25 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDiameter Tolerance\u003c\/strong\u003e: -0.0007 to 0.0000 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeb Configuration\u003c\/strong\u003e: Tapered\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCoolant Through\u003c\/strong\u003e: No\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePrimary Workpiece Material\u003c\/strong\u003e: Stainless Steel, Steel\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSeries\u003c\/strong\u003e: 2550\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eStandards\u003c\/strong\u003e: DIN 338, NAS 907 Type J\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eGrade\u003c\/strong\u003e: Heavy Duty\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.001 pounds\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eStandard Information\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBrand\u003c\/strong\u003e: CHICAGO-LATROBE\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: 54104\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"CHICAGO-LATROBE","offers":[{"title":"Default Title","offer_id":51747605741874,"sku":"54104","price":21.48,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/f7c8a1ac3242b1f7d7858929cfe7c7d2.jpg?v=1788883303","url":"https:\/\/voomisupply.com\/products\/chicago-latrobe-54104-cobalt-drill-bit-letter-d-0-2460-in","provider":"Voomi Supply","version":"1.0","type":"link"}