{"product_id":"hertel-86847977-cobalt-drill-bit-no-40-135-split-point","title":"Hertel 86847977 Cobalt Drill Bit No 40 135 Split Point","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe HERTEL 86847977 is a cobalt threaded shank drill bit designed for drilling into high-tensile strength materials where standard high-speed steel bits fall short. Built to NAS 965 specification, this No. 40 wire gauge bit has a decimal diameter of 0.0980 inches and features a 135-degree split point for fast, self-centering starts without a center punch. The oxide coating improves surface hardness and reduces heat buildup during cutting. The overall length is 2.125 inches with a 0.875-inch flute length. A 1\/4-28 threaded shank locks the bit securely in compatible threaded-chuck tooling, preventing slippage under high-torque conditions.\u003c\/p\u003e\n\u003cp\u003eThis bit is suited for precision hole drilling in aerospace-grade alloys, stainless steel, hardened steels, titanium, and other high-tensile strength metals. The regular spiral flute geometry and right-hand cutting direction make it a standard choice for production drilling and maintenance applications where consistent, accurate hole sizing in tough materials is required. The tapered web configuration reduces cutting resistance and helps clear chips efficiently during deep drilling passes.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eCobalt construction with oxide coating for drilling high-tensile strength and hardened metals\u003c\/li\u003e\n  \u003cli\u003e135-degree split point for self-centering entry and reduced thrust force\u003c\/li\u003e\n  \u003cli\u003e1\/4-28 threaded shank for positive engagement in threaded-chuck tooling\u003c\/li\u003e\n  \u003cli\u003eNAS 965 specification compliance for aerospace and precision manufacturing applications\u003c\/li\u003e\n  \u003cli\u003eWeb-thinned tapered web reduces cutting resistance and improves chip evacuation\u003c\/li\u003e\n  \u003cli\u003eRight-hand cut, regular spiral flute geometry for standard production drilling\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned for use in threaded-shank drill chucks or toolholders accepting a 1\/4-28 thread interface. Suited for drilling high-tensile strength materials including stainless steel, aerospace alloys, and hardened steels.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eInstallation and use should be performed by a qualified machinist or tooling technician familiar with proper drill speeds and feeds for cobalt tooling in hard materials. Ensure the threaded shank is fully engaged and torqued into the holder before operating to prevent bit walk or ejection. Use appropriate cutting fluid or coolant where possible to extend tool life when drilling high-tensile alloys. Always wear appropriate eye protection and follow shop safety protocols when operating rotary cutting tools.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDrill Bit Size (Wire)\u003c\/strong\u003e: No. 40\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDrill Bit Size (Decimal Inch)\u003c\/strong\u003e: 0.0980 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\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOverall Length\u003c\/strong\u003e: 2.125 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFlute Length\u003c\/strong\u003e: 0.875 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eShank Type\u003c\/strong\u003e: Threaded\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eShank Thread Size\u003c\/strong\u003e: 1\/4-28\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 (Regular)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeb Configuration\u003c\/strong\u003e: Tapered, Web-Thinned\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDrill Bit Material\u003c\/strong\u003e: Cobalt\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDrill Bit Finish\/Coating\u003c\/strong\u003e: Oxide\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial Application\u003c\/strong\u003e: High-Tensile Strength Material\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSpecification Number\u003c\/strong\u003e: NAS 965\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: 0.2 pounds\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eStandard Information\u003c\/h4\u003e\n\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: 86847977\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"HERTEL","offers":[{"title":"Default Title","offer_id":51747640279346,"sku":"86847977","price":14.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/ea8d8c1c547ff6dd375cd5004f27f696.jpg?v=1788883916","url":"https:\/\/voomisupply.com\/products\/hertel-86847977-cobalt-drill-bit-no-40-135-split-point","provider":"Voomi Supply","version":"1.0","type":"link"}