{"product_id":"alvord-polk-21821-chucking-reamer-0-2158-in-hss-threaded-shank","title":"Alvord Polk 21821 Chucking Reamer 0.2158 in Hss Threaded Shank","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe ALVORD POLK 21821 is a straight-flute chucking reamer designed for precision hole finishing in metal fabrication and machining applications. Built from high speed steel (HSS) with a bright polished finish, this reamer delivers accurate, repeatable results in production and toolroom environments. It features a threaded shank for positive chuck engagement and cuts in a right-hand direction. The reamer diameter is 0.2158 inches (5.48 mm) with a tight tolerance of plus 0.0002 inches, making it suitable for close-tolerance bore work where fit and finish matter. Licensed machinists and tool-and-die technicians are the primary users of this tool.\u003c\/p\u003e\u003cp\u003eThis chucking reamer is suited for light to medium-duty reaming operations on ferrous and non-ferrous metals. The 1-1\/2 inch flute length provides adequate chip clearance for through-holes and shallow blind holes in typical machining setups. The 2-3\/8 inch overall length fits standard drill press chucks, CNC machining centers, and manual lathes. It is appropriate for job shops, maintenance facilities, and production machining environments requiring consistent hole sizing in the 0.2000 to 0.2499 inch diameter range.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eHigh speed steel construction for durability across a range of workpiece materials\u003c\/li\u003e\n\u003cli\u003eBright polished (uncoated) finish reduces friction and aids chip evacuation\u003c\/li\u003e\n\u003cli\u003e6-flute straight configuration for smooth, consistent surface finish in the bore\u003c\/li\u003e\n\u003cli\u003eThreaded shank ensures positive retention in compatible chucks\u003c\/li\u003e\n\u003cli\u003eRight-hand cutting direction for standard machine spindle use\u003c\/li\u003e\n\u003cli\u003eTight diameter tolerance of plus 0.0002 inches for close-fit hole finishing\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned as a standard chucking reamer for use in drill presses, manual lathes, and CNC machining centers equipped with a compatible threaded-shank chuck or collet system accepting a 0.2000 inch pilot diameter.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eInstallation and use should be performed by a qualified machinist or tool operator. Power down and lock out the machine spindle before mounting or removing the reamer. Ensure the threaded shank is fully seated and secured in the chuck before beginning the cut. Use appropriate cutting fluid for the workpiece material to extend tool life and maintain bore quality.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eReamer Diameter\u003c\/strong\u003e: 0.2158 inches (5.48 mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDiameter Tolerance\u003c\/strong\u003e: +0.0002 inches (+0.005 mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOverall Length\u003c\/strong\u003e: 2.375 inches (60.33 mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlute Length\u003c\/strong\u003e: 1.5 inches (38.10 mm)\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: Threaded\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePilot Diameter\u003c\/strong\u003e: 0.2000 inches\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: Bright (Polished)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDiameter Range\u003c\/strong\u003e: 0.2000 to 0.2499 inches (5.00 to 6.00 mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.25 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: ALVORD POLK\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: 21821\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"ALVORD POLK","offers":[{"title":"Default Title","offer_id":67913361916210,"sku":"21821","price":83.27,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/aad843c7cee67e05524b69b3fcd34f89_4fdc31e2-e697-4a9a-a4ed-cfabbd30658f.jpg?v=1791244787","url":"https:\/\/voomisupply.com\/products\/alvord-polk-21821-chucking-reamer-0-2158-in-hss-threaded-shank","provider":"Voomi Supply","version":"1.0","type":"link"}