{"product_id":"hertel-66691429-screw-machine-drill-bit-25-64-in-cobalt","title":"Hertel 66691429 Screw Machine Drill Bit 25\/64 in Cobalt","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe HERTEL 66691429 is a screw machine length drill bit designed for high-production drilling in metal fabrication, machining, and maintenance repair operations. Built from cobalt high-speed steel with a titanium nitride (TiN) coating, it handles harder workpiece materials and elevated cutting temperatures that would degrade standard HSS tooling. The 135-degree split point reduces thrust, prevents walking on entry, and improves hole accuracy without a center punch. At 3.25 inches overall length with a 1.875-inch flute length, this stub-length geometry provides increased rigidity compared to jobber-length bits, making it well-suited for drill press and CNC drilling applications where chatter and deflection are concerns.\u003c\/p\u003e\u003cp\u003eThis bit is used in metal-working environments including machine shops, fabrication facilities, industrial maintenance departments, and toolroom operations. It is appropriate for drilling stainless steel, alloy steel, titanium, and other hard or abrasive materials where standard M2 HSS tooling wears prematurely. The straight cylindrical shank fits standard drill press chucks, CNC machining center toolholders, and handheld power drill chucks with a matching capacity. The heavy-duty grade designation makes it a fit for continuous production use rather than occasional light-duty work.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eCobalt HSS construction resists heat buildup and wear when drilling 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 starts on contact, reducing required thrust and eliminating bit walking\u003c\/li\u003e\n\u003cli\u003eWeb-thinned, parallel web design lowers cutting resistance throughout the flute length\u003c\/li\u003e\n\u003cli\u003eScrew machine (stub) length increases rigidity and reduces deflection versus jobber-length bits\u003c\/li\u003e\n\u003cli\u003eRight-hand cutting, regular spiral flute with two flutes for efficient chip evacuation\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned as an OEM-style replacement or direct substitute for screw machine length cobalt drill bits in the 0.3500 to 0.4000 decimal inch size range. Part of the HSCO135-TN series.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eInstallation and use of this drill bit should be performed by machinists, tool and die technicians, or qualified maintenance professionals familiar with metal-cutting operations. Secure the straight shank firmly in a properly sized drill chuck before operation and verify runout is within acceptable limits for the application. Always power down and de-energize the machine tool before changing tooling. Do not exceed the recommended speed and feed parameters for the workpiece material and bit diameter as overfeeding will cause premature wear or breakage.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrill Bit Size\u003c\/strong\u003e: 25\/64 inches (0.3906 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\u003eShank Diameter\u003c\/strong\u003e: 0.3906 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 Point\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTool Material\u003c\/strong\u003e: 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\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\u003eSpiral Type\u003c\/strong\u003e: Regular\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 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\u003eSeries\u003c\/strong\u003e: HSCO135-TN\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSize Range\u003c\/strong\u003e: 0.3500 to 0.4000 inches\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: 66691429\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"HERTEL","offers":[{"title":"Default Title","offer_id":51742759190834,"sku":"66691429","price":22.8,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/dd0ef91ab5a9905ce56cdea10f7f11de.jpg?v=1788839271","url":"https:\/\/voomisupply.com\/products\/hertel-66691429-screw-machine-drill-bit-25-64-in-cobalt","provider":"Voomi Supply","version":"1.0","type":"link"}