{"product_id":"accupro-771036-cat40-end-mill-holder-5-8-inch-bore","title":"Accupro 771036 CAT40 End Mill Holder 5\/8 Inch Bore","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe ACCUPRO 771036 is a CAT40 dual contact taper shank end mill holder designed for precision tool retention in CNC machining centers. It accepts a 5\/8 inch bore and provides 4 inches of projection with a 1-21\/32 inch nose diameter. The dual contact taper shank engages both the taper and the spindle face simultaneously, improving rigidity and reducing runout compared to standard single-contact holders. Through-coolant capability supports both through-spindle and DIN flange coolant delivery. With a TIR of 0.0002 inches and a balance rating of 30,000 RPM, this holder suits high-speed finishing and precision profiling operations. It is installed and maintained by CNC machinists and toolroom technicians.\u003c\/p\u003e\u003cp\u003eThis holder is suited for vertical and horizontal machining centers equipped with CAT40 spindles. The 4 inch projection makes it appropriate for applications requiring clearance from the spindle face, including deep-pocket milling and contour work. Through-coolant compatibility supports chip evacuation and tool life in ferrous and non-ferrous cutting applications. The 5\/8-11 retention knob thread size is standard for CAT40 tooling systems. Clamping depth is 1.61 inches, providing secure tool engagement for heavy interrupted cuts or continuous high-feed passes.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eCAT40 dual contact taper shank engages taper and spindle face for improved rigidity\u003c\/li\u003e\n\u003cli\u003e5\/8 inch bore diameter with 1.61 inch clamping depth\u003c\/li\u003e\n\u003cli\u003e4 inch projection for clearance in deep-pocket and contour applications\u003c\/li\u003e\n\u003cli\u003eThrough-coolant compatible via through-spindle and DIN flange delivery\u003c\/li\u003e\n\u003cli\u003eTIR of 0.0002 inches for precise, repeatable tool positioning\u003c\/li\u003e\n\u003cli\u003eBalanced to 30,000 RPM for high-speed machining operations\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned for use in CAT40 spindle machining centers. Retention knob thread size is 5\/8-11, standard for CAT40 tooling. Accepts 5\/8 inch shank end mills and compatible round-shank cutting tools.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eInstallation and tool changes should be performed by qualified CNC machinists or toolroom personnel with the spindle powered down and locked out per facility LOTO procedures. Use a calibrated torque wrench and the appropriate end mill holder wrench when clamping the set screw to avoid galling or over-torquing the bore. Inspect the taper shank and spindle taper for chips, nicks, or contamination before seating the holder. Verify TIR with a dial indicator after installation before beginning any cutting operation.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eShank Type\u003c\/strong\u003e: CAT40 Dual Contact Taper\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBore Diameter\u003c\/strong\u003e: 5\/8 inch\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNose Diameter\u003c\/strong\u003e: 1-21\/32 inch\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProjection\u003c\/strong\u003e: 4 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClamping Depth\u003c\/strong\u003e: 1.61 inches (40.89 mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOverall Length\u003c\/strong\u003e: 6.687 inches (169.84 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: 30,000 RPM\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\u003eRetention Knob Thread Size\u003c\/strong\u003e: 5\/8-11\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePackage Dimensions\u003c\/strong\u003e: 8.5 x 3 x 3 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 3.6 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: 771036\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"ACCUPRO","offers":[{"title":"Default Title","offer_id":51729308909874,"sku":"771036","price":184.91,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/1fbb17b805e884909bca3ce24308a496.jpg?v=1788702722","url":"https:\/\/voomisupply.com\/products\/accupro-771036-cat40-end-mill-holder-5-8-inch-bore","provider":"Voomi Supply","version":"1.0","type":"link"}