{"product_id":"hertel-66691684-screw-machine-drill-bit-letter-s-cobalt","title":"Hertel 66691684 Screw Machine Drill Bit Letter S Cobalt","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe HERTEL 66691684 is a screw machine length drill bit designed for high-production drilling in metal and hard materials. Built from heavy-duty cobalt steel with a titanium nitride (TiN) coating, it delivers extended tool life in abrasive and work-hardening materials such as stainless steel, cast iron, and high-alloy steels. The 135-degree split point with web thinning reduces thrust, improves chip evacuation, and allows self-centering starts without a pilot hole. The straight-cylindrical shank provides secure chuck grip in standard drill chucks and CNC toolholders. At 3-1\/16 inches overall length with a 1-3\/4 inch flute length, this screw machine geometry offers greater rigidity than jobber-length bits in tight-clearance applications.\u003c\/p\u003e\u003cp\u003eThis bit is suited for use in machining centers, drill presses, and hand-held power tools where a Letter S diameter of 0.3480 inches is required. The screw machine length format is common in production environments and sheet metal shops where stub-length rigidity reduces chatter and deflection. Right-hand spiral flute geometry with a regular helix is appropriate for standard metal drilling operations. This is a single-bit package intended for toolroom replenishment, job-site replacement, or low-volume production use.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eLetter S diameter: 0.3480 inches, within the 0.3000 to 0.3500 inch size range\u003c\/li\u003e\n\u003cli\u003e135-degree split point with web thinning reduces entry thrust and self-centers on contact\u003c\/li\u003e\n\u003cli\u003eCobalt steel construction rated for heavy-duty use in hard and abrasive metals\u003c\/li\u003e\n\u003cli\u003eTiN coating extends surface hardness and reduces friction at the cutting edge\u003c\/li\u003e\n\u003cli\u003eScrew machine (stub) length provides greater rigidity than jobber-length bits\u003c\/li\u003e\n\u003cli\u003eStraight-cylindrical shank fits standard 3-jaw chucks and collet-style toolholders\u003c\/li\u003e\n\u003cli\u003eRight-hand cutting with regular spiral flute for efficient chip removal in through-hole drilling\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned as a screw machine length drill bit for use in any standard drill press, machining center, or power drill accepting a 0.3480 inch straight-cylindrical shank. Fits toolholders and chucks sized for the Letter S decimal equivalent diameter range.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eInstallation and use of this drill bit should be performed by a qualified machinist or tooling technician familiar with metal cutting operations. Ensure the machine spindle is fully stopped and secured before mounting or removing the bit. Verify chuck or collet runout before use, as excessive runout accelerates tool wear and reduces hole accuracy. Follow the machine manufacturer and applicable shop safety guidelines for cutting speeds, feed rates, and coolant application.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrill Bit Size (Letter)\u003c\/strong\u003e: S\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrill Bit Size (Decimal Inch)\u003c\/strong\u003e: 0.3480 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOverall Length\u003c\/strong\u003e: 3-1\/16 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlute Length\u003c\/strong\u003e: 1-3\/4 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShank Diameter\u003c\/strong\u003e: 0.3480 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShank Type\u003c\/strong\u003e: Straight-Cylindrical\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\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\u003eTool Material\u003c\/strong\u003e: Cobalt\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrill Bit Grade\u003c\/strong\u003e: Heavy Duty\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCoating\/Finish\u003c\/strong\u003e: TiN\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\u003eCoolant Through\u003c\/strong\u003e: No\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrill Bit Size Range\u003c\/strong\u003e: 0.3000 to 0.3500 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.12 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePackage Quantity\u003c\/strong\u003e: 1\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: 66691684\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"HERTEL","offers":[{"title":"Default Title","offer_id":51743137235250,"sku":"66691684","price":21.8,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/e2f06cf5c95695493a71e342fe22c1bb.jpg?v=1788843120","url":"https:\/\/voomisupply.com\/products\/hertel-66691684-screw-machine-drill-bit-letter-s-cobalt","provider":"Voomi Supply","version":"1.0","type":"link"}