{"product_id":"precision-twist-drill-6001251-letter-r-hss-extension-drill","title":"Precision Twist Drill 6001251 Letter R Hss Extension Drill","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe PRECISION TWIST DRILL 6001251 is a Letter R aircraft extension drill bit engineered for deep-hole drilling applications where standard-length bits cannot reach. Built from high speed steel (HSS) with an oxide finish, this bit features a 135-degree split point that is self-centering and eliminates the need for a center punch on most materials. The extended 12-inch overall length and 3.4375-inch spiral flute accommodate thick workpieces, structural members, and assemblies common in aerospace, aviation maintenance, and heavy fabrication. Licensed tradespeople and MRO technicians working under NAS 907 Type B requirements will find this bit spec-compliant for those applications.\u003c\/p\u003e\u003cp\u003eThis drill bit is suited for use in residential and commercial construction, aviation maintenance, and industrial fabrication environments where extended reach is required. The 0.339-inch diameter straight-cylindrical shank fits standard three-jaw drill chucks without adapters. The two-flute spiral design with web-thinned, tapered web configuration promotes efficient chip evacuation in steel, aluminum, and other ferrous and non-ferrous materials. General-purpose tool performance rating makes it appropriate for a wide range of drilling tasks in sheet metal, structural steel, and composite assemblies.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e135-degree split point is self-centering for accurate hole starts without center punching\u003c\/li\u003e\n\u003cli\u003e12-inch overall length provides extended reach into deep cavities and structural assemblies\u003c\/li\u003e\n\u003cli\u003eHigh speed steel construction withstands heat generated in continuous drilling operations\u003c\/li\u003e\n\u003cli\u003eOxide finish improves lubricity and surface hardness for longer service life\u003c\/li\u003e\n\u003cli\u003eWeb-thinned, tapered web reduces feed force and minimizes heat buildup at the cutting tip\u003c\/li\u003e\n\u003cli\u003eMeets NAS 907 Type B standards for aircraft and aerospace drilling applications\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned as an OEM-style replacement and general-use aircraft extension drill bit for applications requiring a Letter R (0.339-inch) diameter hole with an extended 12-inch reach in standard three-jaw drill chucks.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eAircraft extension drill bits of this type are typically installed and operated by licensed aviation maintenance technicians, machinists, or qualified tradespeople. Secure the straight-cylindrical shank firmly in a drill chuck rated for the intended RPM before use. Ensure the workpiece is clamped or fixtured to prevent movement during drilling. Apply appropriate cutting fluid for ferrous materials to extend bit life and maintain hole quality.\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)\u003c\/strong\u003e: 0.339 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: 3.4375 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShank Diameter\u003c\/strong\u003e: 0.339 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\u003eNumber of Flutes\u003c\/strong\u003e: 2\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlute Type\u003c\/strong\u003e: Spiral\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: High Speed Steel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCoating\/Finish\u003c\/strong\u003e: Oxide\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSelf-Centering\u003c\/strong\u003e: Yes\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeries\u003c\/strong\u003e: 502-12\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandards\u003c\/strong\u003e: NAS 907 Type B\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTool Performance\u003c\/strong\u003e: General Purpose\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.083 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: PRECISION TWIST DRILL\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: 6001251\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"PRECISION TWIST DRILL","offers":[{"title":"Default Title","offer_id":51699949764914,"sku":"6001251","price":64.27,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/8b95963359e0e9e891b37a0b3fb5497c_d862a85f-16cc-46df-bdf5-57a511ebc180.jpg?v=1788383921","url":"https:\/\/voomisupply.com\/products\/precision-twist-drill-6001251-letter-r-hss-extension-drill","provider":"Voomi Supply","version":"1.0","type":"link"}