{"product_id":"accupro-771220-shell-mill-holder-cat50-1-inch-pilot","title":"Accupro 771220 Shell Mill Holder CAT50 1 Inch Pilot","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe ACCUPRO 771220 is a CAT50 dual contact taper shank shell mill holder designed for secure, high-precision face milling operations on CNC machining centers. The dual contact interface engages both the taper and the spindle face simultaneously, increasing rigidity and reducing runout compared to standard taper-only holders. Total indicator runout (TIR) is rated at 0.0002 inches. The holder features a 1-inch pilot diameter, a 2.75-inch nose diameter, and a flange-to-nose projection of 6 inches, with an overall length of 10 inches. Through-spindle and DIN flange coolant delivery are both supported. This holder is installed by CNC machinists and tooling specialists in production shop environments.\u003c\/p\u003e\u003cp\u003eThe 771220 is suited for face milling and shell milling applications on vertical and horizontal CNC machining centers equipped with CAT50 spindles. It accepts shell mill cutters in the 2.25-inch to 2.75-inch cutting diameter range. The through-coolant capability supports flood and directed coolant strategies used in steel, cast iron, and aluminum milling. The lock screw thread size is 1\/2-20. Balanced to 10,000 RPM, this holder is appropriate for both roughing and finishing operations where spindle stability and minimal runout are critical.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eDual contact taper shank engages both taper and spindle face for increased rigidity\u003c\/li\u003e\n\u003cli\u003eTIR rated at 0.0002 inches for high-precision fitment\u003c\/li\u003e\n\u003cli\u003eThrough-spindle and DIN flange coolant delivery supported\u003c\/li\u003e\n\u003cli\u003eBalanced to 10,000 RPM for stable high-speed milling\u003c\/li\u003e\n\u003cli\u003eAccepts shell mill cutters from 2.25 inches to 2.75 inches cutting diameter\u003c\/li\u003e\n\u003cli\u003eLock screw thread size 1\/2-20 for secure cutter retention\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned for use with CAT50 spindle machining centers accepting dual contact taper shank toolholders. Compatible with shell mill cutters in the 2.25-inch to 2.75-inch cutting diameter range.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eInstallation should be performed by a qualified CNC machinist or tooling technician with the machine powered down and the spindle locked before mounting or removing the holder. Ensure the spindle taper and holder shank are clean and free of chips, burrs, or coolant residue before seating to achieve proper dual contact engagement. Verify draw bar torque per the machine tool manufacturer specification before resuming operation. Coolant port connections should be confirmed leak-free before running through-spindle coolant.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eShank Type\u003c\/strong\u003e: Dual Contact Taper\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTaper Size\u003c\/strong\u003e: CAT50\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePilot Diameter\u003c\/strong\u003e: 1 inch (25.40 mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNose Diameter\u003c\/strong\u003e: 2.75 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlange to Nose Projection\u003c\/strong\u003e: 6 inches (152.40 mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOverall Length\u003c\/strong\u003e: 10 inches (254.00 mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShell Mill Cutting Diameter Range\u003c\/strong\u003e: 2.25 inches to 2.75 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTIR\u003c\/strong\u003e: 0.0002 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCoolant Type\u003c\/strong\u003e: Through-Spindle and DIN Flange\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLock Screw Thread Size\u003c\/strong\u003e: 1\/2-20\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBalanced To RPM\u003c\/strong\u003e: 10,000 RPM\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 12.4 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePackage Dimensions\u003c\/strong\u003e: 12.5 inches L x 4.5 inches W x 4.5 inches H\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eStandard Information\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand\u003c\/strong\u003e: ACCUPRO\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: 771220\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"ACCUPRO","offers":[{"title":"Default Title","offer_id":51753336996146,"sku":"771220","price":406.43,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/28699f9d3f2bf07ad7610f8dde52db53.jpg?v=1788935577","url":"https:\/\/voomisupply.com\/products\/accupro-771220-shell-mill-holder-cat50-1-inch-pilot","provider":"Voomi Supply","version":"1.0","type":"link"}