{"product_id":"hertel-66691544-drill-bit-letter-d-cobalt-tin-135-deg","title":"Hertel 66691544 Drill Bit Letter D Cobalt Tin 135 Deg","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe HERTEL 66691544 is a screw machine length drill bit designed for high-production drilling in metal fabrication, machining, and general industrial applications. Built from heavy-duty cobalt steel with a titanium nitride (TiN) coating, it delivers extended tool life in hard and abrasive materials. The 135-degree split point reduces walking and cutting thrust at entry, and the web-thinned, parallel-web construction improves chip evacuation. At 2.5 inches overall length, this short-series bit fits standard drill presses, CNC machining centers, and hand-held power tools where rigidity and reduced deflection matter most.\u003c\/p\u003e\u003cp\u003eThis bit is sized at Letter D (0.2460 inches diameter) and is suited for drilling ferrous and non-ferrous metals including stainless steel, cast iron, and hardened alloys. The screw machine length format is a common choice in production environments where tooling clearance is limited and hole location accuracy is critical. Right-hand spiral flutes with a 1.375-inch flute length handle chip removal effectively in both through-hole and blind-hole operations. The straight cylindrical shank at 0.2460 inches fits standard drill chucks without adapters.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eLetter D size  -  0.2460 inches diameter, fits standard 3-jaw drill chucks directly\u003c\/li\u003e\n\u003cli\u003eCobalt steel construction rated for heavy-duty cutting in hard and abrasive materials\u003c\/li\u003e\n\u003cli\u003eTiN coating extends tool life and reduces heat buildup during cutting\u003c\/li\u003e\n\u003cli\u003e135-degree split point minimizes walk and reduces entry thrust\u003c\/li\u003e\n\u003cli\u003eWeb-thinned parallel web improves chip flow and reduces cutting load\u003c\/li\u003e\n\u003cli\u003eScrew machine (stub) length provides maximum rigidity and reduced deflection\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned as an OEM-style replacement or production consumable for use in drill presses, machining centers, and power tools accepting a 0.2460-inch straight cylindrical shank drill bit.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eInstallation and use should be performed by machinists or qualified trade professionals familiar with drill press and CNC tooling safety procedures. Secure the shank fully in the chuck and verify runout before use. Always wear appropriate eye protection and secure the workpiece before drilling. Inspect the cutting edge for wear or chipping before each use, as a damaged point on a cobalt bit can fracture under load.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrill Bit Size\u003c\/strong\u003e: Letter D\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrill Bit Size (Decimal)\u003c\/strong\u003e: 0.2460 inches\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\u003eShank Diameter\u003c\/strong\u003e: 0.2460 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShank Type\u003c\/strong\u003e: Straight-Cylindrical\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: TiN (Titanium Nitride)\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\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpiral Type\u003c\/strong\u003e: Regular\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlute Type\u003c\/strong\u003e: Spiral\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: Parallel\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\u003eDrill Bit Grade\u003c\/strong\u003e: Heavy Duty\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.1 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: 66691544\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"HERTEL","offers":[{"title":"Default Title","offer_id":51740459958578,"sku":"66691544","price":14.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/50076afb9c4142f59eb9221339f9dd00.jpg?v=1788825145","url":"https:\/\/voomisupply.com\/products\/hertel-66691544-drill-bit-letter-d-cobalt-tin-135-deg","provider":"Voomi Supply","version":"1.0","type":"link"}