{"product_id":"hertel-66691726-screw-machine-drill-bit-letter-w-cobalt","title":"Hertel 66691726 Screw Machine Drill Bit Letter W Cobalt","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe HERTEL 66691726 is a screw machine length drill bit designed for high-production drilling in metal fabrication, machining, and maintenance applications. Sized at Letter W (0.3860 inches), this bit is ground from cobalt steel and finished with a titanium nitride (TiN) coating to extend cutting life in abrasive and work-hardening materials. The 135-degree split point geometry reduces walking on entry and lowers thrust requirements, making it well suited for harder metals and interrupted cuts. Overall length is 3.25 inches with a 1.875-inch flute length, keeping the tool rigid in short-reach setups. The straight cylindrical shank fits standard drill chucks without modification.\u003c\/p\u003e\u003cp\u003eThis bit is intended for use in screw machines, drill presses, and CNC machining centers where a compact, stubby profile improves rigidity and reduces deflection. It is appropriate for drilling carbon steel, alloy steel, stainless steel, and cast iron in both job-shop and production environments. The heavy-duty grade designation and cobalt substrate make it a practical choice when standard high-speed steel bits wear prematurely. Machinists, tool-and-die technicians, and maintenance mechanics are the primary users.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eLetter W size  -  0.3860 inches decimal equivalent, within the 0.3500 to 0.4000 inch range\u003c\/li\u003e\n\u003cli\u003eCobalt steel construction with TiN coating for extended tool life in hard and abrasive materials\u003c\/li\u003e\n\u003cli\u003e135-degree split point reduces entry walking and cutting thrust\u003c\/li\u003e\n\u003cli\u003eWeb-thinned parallel web geometry improves chip evacuation and reduces heat buildup\u003c\/li\u003e\n\u003cli\u003eScrew machine (stub) length profile increases rigidity and minimizes deflection\u003c\/li\u003e\n\u003cli\u003eRight-hand cut with regular spiral flutes and 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 replacement screw machine length drill bit for any standard drill chuck or collet accepting a 0.3860-inch straight cylindrical shank.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eSecure the shank fully in a properly sized drill chuck or collet before operation. Ensure the machine spindle is fully stopped and locked out before changing bits. Use appropriate cutting fluid or coolant for the workpiece material to maximize tool life, noting that this bit does not support through-coolant delivery. Follow applicable shop safety standards and machine manufacturer guidelines for speed and feed settings.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrill Bit Size (Letter)\u003c\/strong\u003e: W\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrill Bit Size (Decimal Inch)\u003c\/strong\u003e: 0.3860 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: 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\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCutting Direction\u003c\/strong\u003e: Right Hand\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\u003eShank Type\u003c\/strong\u003e: Straight-Cylindrical\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShank Diameter\u003c\/strong\u003e: 0.3860 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOverall Length\u003c\/strong\u003e: 3.25 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlute Length\u003c\/strong\u003e: 1.875 inches\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\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\u003eWeight\u003c\/strong\u003e: 0.12 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: 66691726\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"HERTEL","offers":[{"title":"Default Title","offer_id":51740344058162,"sku":"66691726","price":24.36,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/2c02b139b510d647b9242b7af53daaa5.jpg?v=1788824458","url":"https:\/\/voomisupply.com\/products\/hertel-66691726-screw-machine-drill-bit-letter-w-cobalt","provider":"Voomi Supply","version":"1.0","type":"link"}