{"product_id":"accupro-772120-end-mill-holder-cat50-3-8-inch-through-coolant","title":"Accupro 772120 End Mill Holder CAT50 3\/8 Inch Through Coolant","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe ACCUPRO 772120 is a CAT50 taper shank end mill holder designed for CNC machining centers requiring high-speed, precision toolholding. It accepts a 3\/8 inch bore and delivers a 4 inch projection from the spindle face, allowing access to workpieces where clearance is a factor. The nose diameter measures 1 inch. Total indicated runout (TIR) is rated at 0.0002 inches, supporting tight tolerances in milling operations. The holder is balanced to 25,000 RPM, making it suitable for high-speed machining applications. Through-spindle and DIN flange coolant delivery is supported, directing coolant directly to the cutting zone for improved chip evacuation and tool life.\u003c\/p\u003e\u003cp\u003eThis end mill holder is used in production and job-shop environments where CAT50 spindle tooling is standard. It is appropriate for vertical and horizontal machining centers running end mills in ferrous and non-ferrous materials. The 4 inch projection and 1.26 inch clamping depth provide secure tool retention across a range of end mill shank lengths. Machinist technicians and CNC setup personnel are the primary installers. The retention knob thread size is 1-8, which is standard for CAT50 tooling assemblies.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eCAT50 taper shank for direct spindle mounting on compatible machining centers\u003c\/li\u003e\n\u003cli\u003e3\/8 inch bore accepts standard end mill shank sizes\u003c\/li\u003e\n\u003cli\u003eTIR of 0.0002 inches for precision concentricity\u003c\/li\u003e\n\u003cli\u003eBalanced to 25,000 RPM for high-speed machining compatibility\u003c\/li\u003e\n\u003cli\u003eThrough-spindle and DIN flange coolant delivery directs fluid to the cutting edge\u003c\/li\u003e\n\u003cli\u003eRetention knob thread size 1-8, standard for CAT50 systems\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned as an OEM-style toolholder for CAT50 spindle machining centers using standard 1-8 retention knob thread configurations. Accepts end mills with a 3\/8 inch straight shank.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eInstallation should be performed by a qualified CNC machinist or toolroom technician. Power down and lock out the machining center spindle before inserting or removing any toolholder. Use a torque wrench and the machine manufacturer's specified retention knob procedure — do not rely on hand-tightening alone. Verify TIR with a dial indicator after installation before running the spindle.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eShank Type\u003c\/strong\u003e: CAT50 Taper\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHole Diameter\u003c\/strong\u003e: 3\/8 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProjection\u003c\/strong\u003e: 4 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOverall Length\u003c\/strong\u003e: 8 inches (203.20 mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNose Diameter\u003c\/strong\u003e: 1 inch\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClamping Depth\u003c\/strong\u003e: 1.26 inches (32.00 mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTIR\u003c\/strong\u003e: 0.0002 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBalanced To\u003c\/strong\u003e: 25,000 RPM\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\u003eRetention Knob Thread Size\u003c\/strong\u003e: 1-8\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePackage Dimensions\u003c\/strong\u003e: 9.5 x 4.5 x 4.5 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 7.4 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: ACCUPRO\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: 772120\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"ACCUPRO","offers":[{"title":"Default Title","offer_id":51731928416562,"sku":"772120","price":193.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/59fda9bcb426d8cc3d86f8b7e6adbd7b.jpg?v=1788736752","url":"https:\/\/voomisupply.com\/products\/accupro-772120-end-mill-holder-cat50-3-8-inch-through-coolant","provider":"Voomi Supply","version":"1.0","type":"link"}