{"product_id":"hertel-c-e07-0357-aircraft-drill-bit-no-28-cobalt","title":"Hertel C.E07.0357 Aircraft Drill Bit No. 28 Cobalt","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe HERTEL C.E07.0357 is a cobalt aircraft extension drill bit designed for deep-reach drilling in aerospace, structural, and industrial applications. Built to NAS 907 standards, it features a 135-degree split point that is self-centering and reduces walking on entry, minimizing the need for a center punch. The two-flute spiral design with a web-thinned, tapered web configuration reduces cutting resistance and chip load. At 12 inches overall length, this bit reaches fastener holes and structural panels that standard-length bits cannot access. The straw finish is typical of cobalt tooling processed for heat resistance and surface hardness.\u003c\/p\u003e\u003cp\u003eThis bit is sized to wire gauge No. 28, equivalent to 0.1405 inches decimal diameter, and is suited for drilling aluminum, stainless steel, high-strength alloys, and composite materials commonly encountered in aircraft maintenance, sheet metal work, and structural fabrication. The straight cylindrical shank at 0.1405 inches diameter fits standard drill chucks without an adapter. It is appropriate for use with pneumatic or electric right-hand drill motors in both production and MRO environments.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eNAS 907 standard cobalt construction for high-heat and abrasion-resistant drilling\u003c\/li\u003e\n\u003cli\u003e135-degree split point with web thinning for self-centering entry and reduced thrust\u003c\/li\u003e\n\u003cli\u003e12-inch overall length provides extended reach into deep cavities and structural panels\u003c\/li\u003e\n\u003cli\u003e1.75-inch spiral flute length for efficient chip evacuation in short-flute cuts\u003c\/li\u003e\n\u003cli\u003eRight-hand cutting direction with two flutes and tapered web configuration\u003c\/li\u003e\n\u003cli\u003eStraw finish consistent with cobalt tooling thermal processing\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned as a general-purpose aircraft extension drill bit for use in right-hand drill motors accepting a straight cylindrical shank of 0.1405 inches diameter. Sized to wire gauge No. 28 per NAS 907.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eThis bit is installed and removed by a licensed machinist, aircraft maintenance technician, or qualified sheet metal worker using a standard keyed or keyless chuck. Secure the shank fully in the chuck before applying power to prevent runout or bit ejection. Ensure the workpiece is properly clamped before drilling, especially with extended-length bits where lateral flex can affect hole location. Follow applicable workplace safety and aviation maintenance manual procedures when drilling structural components.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrill Bit Size (Wire Gauge)\u003c\/strong\u003e: No. 28\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrill Bit Size (Decimal)\u003c\/strong\u003e: 0.1405 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOverall Length\u003c\/strong\u003e: 12 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlute Length\u003c\/strong\u003e: 1.75 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShank Diameter\u003c\/strong\u003e: 0.1405 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\u003eFlute Type\u003c\/strong\u003e: Spiral\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNumber of Flutes\u003c\/strong\u003e: 2\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: Tapered Web-Thinned\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: Straw\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSelf-Centering\u003c\/strong\u003e: Yes\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandard\u003c\/strong\u003e: NAS 907\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.05 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: C.E07.0357\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"HERTEL","offers":[{"title":"Default Title","offer_id":51746831204658,"sku":"C.E07.0357","price":31.25,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/1fbcedba0cfb4e1a6d4b21a8981f240d.jpg?v=1788873893","url":"https:\/\/voomisupply.com\/products\/hertel-c-e07-0357-aircraft-drill-bit-no-28-cobalt","provider":"Voomi Supply","version":"1.0","type":"link"}