{"product_id":"hertel-72309131-chucking-reamer-letter-m-cobalt-steel","title":"Hertel 72309131 Chucking Reamer Letter M Cobalt Steel","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe HERTEL 72309131 is a cobalt steel chucking reamer designed to finish-ream holes to a Letter M diameter of 0.2950 inches. Built with six straight flutes and a right-hand cutting direction, it delivers consistent bore accuracy in ferrous and harder alloy workpieces. The straight-cylindrical shank seats securely in standard drill chucks and collets. At 6 inches overall length with a 1.5-inch flute length, this tool is well-suited for through-hole and blind-hole finishing operations on the mill, drill press, or lathe. The bright, uncoated finish makes wear inspection straightforward during production runs. Machinists and tool-and-die professionals reaching tight tolerances on close-fit holes are the primary users.\u003c\/p\u003e\u003cp\u003eThis chucking reamer is used in machine shop production and maintenance environments where holes must be brought to a precise final diameter. Typical applications include fixture bores, bushing seats, and shaft fits in both job-shop and production settings. The cobalt steel construction provides improved heat resistance compared to standard high-speed steel, making it a practical choice when reaming harder steels or running at elevated speeds without flood coolant. It ships as a single unit with no minimum order beyond one piece.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eLetter M diameter (0.2950 inches) for precise final bore sizing\u003c\/li\u003e\n\u003cli\u003eCobalt steel construction for improved heat and wear resistance over standard HSS\u003c\/li\u003e\n\u003cli\u003eSix straight flutes for smooth, consistent material removal\u003c\/li\u003e\n\u003cli\u003eRight-hand cutting direction compatible with standard machine spindles\u003c\/li\u003e\n\u003cli\u003eStraight-cylindrical shank fits common drill chucks and ER collets\u003c\/li\u003e\n\u003cli\u003eBright, uncoated finish for easy wear monitoring\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned as a machine chucking reamer for use in drill presses, lathes, knee mills, and CNC machining centers equipped with a drill chuck or straight-shank collet holder accepting a 0.2950-inch diameter tool.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eThis reamer is installed by a machinist or tool-and-die technician. Power down the machine spindle and confirm zero motion before changing tooling. Secure the straight-cylindrical shank fully within the chuck or collet to the recommended grip depth to prevent runout. Always apply cutting fluid appropriate to the workpiece material, and allow reaming stock of 0.001 to 0.005 inches for best results — do not ream from a rough-drilled condition without an intermediate boring or drilling step.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eReamer Diameter (Letter)\u003c\/strong\u003e: M\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReamer Diameter (Decimal Inch)\u003c\/strong\u003e: 0.2950 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOverall Length\u003c\/strong\u003e: 6 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlute Length\u003c\/strong\u003e: 1.5 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNumber of Flutes\u003c\/strong\u003e: 6\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlute Type\u003c\/strong\u003e: Straight\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCutting Direction\u003c\/strong\u003e: Right Hand\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShank Type\u003c\/strong\u003e: Straight-Cylindrical\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTool Material\u003c\/strong\u003e: Cobalt Steel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCoating\/Finish\u003c\/strong\u003e: Bright\/Uncoated\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDowel Pin Reamer\u003c\/strong\u003e: No\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOver\/Under Size Reamer\u003c\/strong\u003e: No\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.15 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUNSPSC Code\u003c\/strong\u003e: 23241611\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: 72309131\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"HERTEL","offers":[{"title":"Default Title","offer_id":51744646660402,"sku":"72309131","price":92.26,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/acab5d520777aa0c60a932f66ce96a62_faf3767e-b989-4120-bebe-57cbc2245cba.jpg?v=1788859455","url":"https:\/\/voomisupply.com\/products\/hertel-72309131-chucking-reamer-letter-m-cobalt-steel","provider":"Voomi Supply","version":"1.0","type":"link"}