{"product_id":"accupro-772026-end-mill-holder-cat40-5-16-in-through-coolant","title":"Accupro 772026 End Mill Holder CAT40 5\/16 in Through Coolant","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe ACCUPRO 772026 is a CAT40 taper shank end mill holder designed for use in CNC machining centers where precision toolholding and coolant delivery are required. It accepts a 5\/16 inch bore and delivers a 4 inch projection from the spindle face, giving machinists the clearance needed for deep-reach milling operations. The holder features through-spindle and DIN flange coolant delivery, a 1 inch nose diameter, and is balanced to 30,000 RPM for use in high-speed applications. Total indicator runout (TIR) is rated at 0.0002 inches, supporting tight-tolerance work in ferrous and non-ferrous materials.\u003c\/p\u003e\u003cp\u003eThis end mill holder is suited for production and job-shop CNC vertical and horizontal machining centers running CAT40 spindle interfaces. The 4 inch projection makes it a practical choice when extended reach is needed to clear fixtures or workpiece features. The 5\/8-11 drawbar and retention knob thread sizes are standard for CAT40 tooling systems. It is typically installed and set up by CNC machinists, toolroom technicians, or setup technicians working in precision manufacturing environments.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eCAT40 taper shank for standard CNC machining center spindle interface\u003c\/li\u003e\n\u003cli\u003e5\/16 inch bore diameter with 1.2600 inch clamping depth for secure tool engagement\u003c\/li\u003e\n\u003cli\u003e4 inch projection for extended reach milling applications\u003c\/li\u003e\n\u003cli\u003eThrough-spindle and DIN flange coolant delivery for chip evacuation and tool cooling\u003c\/li\u003e\n\u003cli\u003eBalanced to 30,000 RPM for high-speed machining compatibility\u003c\/li\u003e\n\u003cli\u003eTIR of 0.0002 inches for precision toolholding accuracy\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned as a direct-fit toolholder for CNC machining centers with a CAT40 spindle interface and a 5\/8-11 drawbar thread. Accepts standard 5\/16 inch shank end mills and compatible cutting tools.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eInstallation should be performed by a qualified CNC machinist or toolroom technician with the machine powered down and the spindle fully stopped before mounting or removing toolholders. Use a proper CAT40 tool-holding fixture or vise to secure the holder during tool clamping — never clamp on the taper itself. Verify retention knob torque per machine builder specifications and confirm TIR with a dial indicator after installation before resuming cutting operations.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eShank Type\u003c\/strong\u003e: CAT40 Taper\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHole Diameter\u003c\/strong\u003e: 5\/16 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNose Diameter\u003c\/strong\u003e: 1 inch\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: 6.75 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClamping Depth\u003c\/strong\u003e: 1.2600 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTIR\u003c\/strong\u003e: 0.0002 inches (0.0050 mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThrough Coolant\u003c\/strong\u003e: Yes — Through-Spindle and DIN Flange\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrawbar Thread Size\u003c\/strong\u003e: 5\/8-11\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRetention Knob Thread Size\u003c\/strong\u003e: 5\/8-11\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBalanced To\u003c\/strong\u003e: 30,000 RPM\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 2.8 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePackage Dimensions\u003c\/strong\u003e: 8.25 x 3 x 3 inches\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: 772026\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"ACCUPRO","offers":[{"title":"Default Title","offer_id":51732508180786,"sku":"772026","price":159.55,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/079987ba95490517cafda31df0d9bc2d_ea6fc570-13dd-41f3-a426-049d49f2e191.jpg?v=1788743759","url":"https:\/\/voomisupply.com\/products\/accupro-772026-end-mill-holder-cat40-5-16-in-through-coolant","provider":"Voomi Supply","version":"1.0","type":"link"}