{"product_id":"value-collection-231-4716-r8-round-collet-1-4-inch","title":"Value Collection 231-4716 R8 Round Collet 1\/4 Inch","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe VALUE COLLECTION 231-4716 is a 1\/4-inch R8 round collet machined from steel for use in Bridgeport-style vertical milling machines and other mills equipped with an R8 spindle taper. The collet accepts a 1\/4-inch tool shank and uses a standard 7\/16-20 drawbar thread for secure engagement with the machine spindle. A total indicated runout (TIR) rating of 0.0007 inches supports accurate, repeatable cuts across a range of milling operations. The part is suited for use by machinists, tool-and-die makers, and general machine shop personnel.\u003c\/p\u003e\n\u003cp\u003eThis collet is designed for standard vertical knee mills and similar machine tools fitted with an R8 spindle. It is appropriate for holding 1\/4-inch shank end mills, drill bits, reamers, and other cutting tools of the same shank diameter. The 7\/16-20 drawbar thread matches the standard R8 drawbar specification found on most domestic and imported R8-spindle machines. Typical applications include production milling, prototype work, and maintenance machining in both job shop and manufacturing environments.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e1\/4-inch bore accepts standard 1\/4-inch shank cutting tools\u003c\/li\u003e\n  \u003cli\u003eR8 taper profile fits Bridgeport-style and compatible vertical milling machine spindles\u003c\/li\u003e\n  \u003cli\u003e7\/16-20 drawbar thread matches standard R8 drawbar specification\u003c\/li\u003e\n  \u003cli\u003e0.0007-inch TIR for consistent tool concentricity and cut accuracy\u003c\/li\u003e\n  \u003cli\u003eSteel construction for durability under repeated clamping cycles\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned as a direct-fit replacement or supplemental collet for vertical milling machines equipped with an R8 spindle taper and a 7\/16-20 drawbar thread.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eInstallation is performed by a qualified machinist or machine tool operator. Power down and de-energize the machine before changing collets. Insert the collet into the spindle bore and thread the drawbar by hand before snugging with a wrench — do not overtighten the drawbar, as this can damage the collet or spindle. Inspect the collet bore and spindle taper for chips or debris before each use to maintain TIR performance.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCollet Type\u003c\/strong\u003e: R8 Round Collet\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBore Size\u003c\/strong\u003e: 0.25 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDrawbar Thread Size\u003c\/strong\u003e: 7\/16-20 in\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTotal Indicated Runout (TIR)\u003c\/strong\u003e: 0.0007 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial\u003c\/strong\u003e: Steel\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.59 pounds\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePackage Quantity\u003c\/strong\u003e: 1\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: VALUE COLLECTION\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: 231-4716\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"VALUE COLLECTION","offers":[{"title":"Default Title","offer_id":51699869188402,"sku":"231-4716","price":26.74,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/24eb703f1cdb1377cb84067f6ba2135a.jpg?v=1788382282","url":"https:\/\/voomisupply.com\/products\/value-collection-231-4716-r8-round-collet-1-4-inch","provider":"Voomi Supply","version":"1.0","type":"link"}