{"product_id":"hertel-66693557-drill-bit-letter-r-hss-tin-135-deg","title":"Hertel 66693557 Drill Bit Letter R Hss Tin 135 Deg","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe HERTEL 66693557 is a screw machine length drill bit designed for high-speed, high-production drilling in metal and hard materials. Built from high-speed steel (HSS) with a titanium nitride (TiN) coating, it delivers extended tool life and reduced heat buildup compared to uncoated HSS tooling. The 135-degree split point geometry reduces walking on contact and lowers the thrust required to penetrate the workpiece. At 3 inches overall length and a letter R diameter of 0.3390 inches, this short-body stub drill is suited for use in tight-clearance fixtures, drill presses, and CNC setups where rigidity matters. Installation is performed by machinists, tool and die technicians, and general metalworking trades.\u003c\/p\u003e\u003cp\u003eThis drill bit is used in screw machine shops, production machining environments, and general metalworking applications requiring a letter R size hole. The stub length body minimizes deflection during deep-feed operations in steel, cast iron, aluminum, and similar materials. The TiN coating provides a harder cutting surface and reduced friction, making it a good fit for repetitive production runs where tool longevity is a priority. It accepts standard straight-shank toolholders and collet chucks sized for a 0.3390-inch shank diameter.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eLetter R diameter (0.3390 inches) with straight-cylindrical shank of matching diameter\u003c\/li\u003e\n\u003cli\u003e135-degree split point reduces drill walking and lowers required feed pressure\u003c\/li\u003e\n\u003cli\u003eTiN coating extends tool life and reduces friction during metal cutting\u003c\/li\u003e\n\u003cli\u003eScrew machine (stub) length body at 3 inches OAL improves rigidity and reduces deflection\u003c\/li\u003e\n\u003cli\u003eWeb-thinned parallel web configuration for improved chip clearance\u003c\/li\u003e\n\u003cli\u003e2-flute regular spiral design for efficient chip evacuation in through-hole drilling\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned for use in standard straight-shank drill chucks, collet chucks, and screw machine spindles accepting a 0.3390-inch shank diameter. Fits tooling setups within the 0.3000 to 0.3500 inch drill bit size range.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eThis drill bit is installed and operated by machinists and metalworking technicians using standard drill presses, lathes, or CNC machining centers. Ensure the spindle and chuck are fully stopped and de-energized before inserting or removing the bit. Secure the shank fully in the chuck to the recommended grip depth to prevent pullout under load. Do not use this bit on materials or at feed rates beyond the capacity of the toolholder and machine setup.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrill Bit Size (Letter)\u003c\/strong\u003e: R\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrill Bit Size (Decimal Inch)\u003c\/strong\u003e: 0.3390 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOverall Length\u003c\/strong\u003e: 3 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlute Length\u003c\/strong\u003e: 1.6875 inches\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\u003eTool Material\u003c\/strong\u003e: High-Speed Steel (HSS)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCoating\u003c\/strong\u003e: Titanium Nitride (TiN)\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\u003eShank Type\u003c\/strong\u003e: Straight-Cylindrical\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShank Diameter\u003c\/strong\u003e: 0.3390 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCutting Direction\u003c\/strong\u003e: Right Hand\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrill Bit Grade\u003c\/strong\u003e: Heavy Duty\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: HSH135-TN\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.12 pounds\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: 66693557\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"HERTEL","offers":[{"title":"Default Title","offer_id":51740800549170,"sku":"66693557","price":18.7,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/f7fdb257a888029fa53af0a094298b81.jpg?v=1788827498","url":"https:\/\/voomisupply.com\/products\/hertel-66693557-drill-bit-letter-r-hss-tin-135-deg","provider":"Voomi Supply","version":"1.0","type":"link"}