{"product_id":"accupro-772040-end-mill-holder-cat40-7-16-in-through-coolant","title":"Accupro 772040 End Mill Holder CAT40 7\/16 in Through Coolant","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe ACCUPRO 772040 is a CAT40 taper shank end mill holder designed for CNC machining centers requiring precise tool retention and through-coolant capability. With a 7\/16 inch hole diameter, 2.5 inch projection, and 1.75 inch nose diameter, this holder accommodates end mills in high-speed applications up to 30,000 RPM. A total indicator runout (TIR) of 0.0002 inch supports tight-tolerance work where tool concentricity directly affects surface finish and tool life. Machinist and tooling specialists install this holder as part of a CAT40 tooling system on vertical and horizontal machining centers.\u003c\/p\u003e\u003cp\u003eThis holder fits production and job-shop environments running CAT40 spindle machines. The through-coolant design delivers cutting fluid directly to the tool tip, improving chip evacuation and heat management during deep-pocket milling, slotting, and extended-reach operations. The 1.5 inch clamping depth provides secure tool engagement across a range of end mill shank lengths. Coolant is supplied via through-spindle and DIN flange porting, making this holder compatible with machines equipped with either coolant delivery method.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eCAT40 taper shank for positive spindle engagement on CAT40 machining centers\u003c\/li\u003e\n\u003cli\u003e7\/16 inch hole diameter with 1.5 inch clamping depth for secure end mill retention\u003c\/li\u003e\n\u003cli\u003eThrough-coolant design supports both through-spindle and DIN flange coolant delivery\u003c\/li\u003e\n\u003cli\u003eBalanced to 30,000 RPM for high-speed machining applications\u003c\/li\u003e\n\u003cli\u003eTIR of 0.0002 inch for tight concentricity tolerances\u003c\/li\u003e\n\u003cli\u003e5\/8-11 drawbar and retention knob thread size for standard CAT40 pull studs\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned for use in CAT40 spindle machining centers with through-spindle or DIN flange coolant systems. Accepts end mills with a 7\/16 inch shank diameter. Retention knob thread size is 5\/8-11, compatible with standard CAT40 pull studs.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eInstallation should be performed by a qualified machinist or toolroom technician familiar with CAT40 tooling systems. Power down and lock out the machining center spindle before inserting or removing the holder. Use a calibrated torque wrench and the appropriate spanner or end mill holder wrench when securing the tool — do not overtighten the setscrews. Verify TIR with a dial indicator after assembly before returning the machine to production.\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: 7\/16 inch\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNose Diameter\u003c\/strong\u003e: 1.75 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProjection\u003c\/strong\u003e: 2.5 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOverall Length\u003c\/strong\u003e: 4.5 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClamping Depth\u003c\/strong\u003e: 1.5 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTIR\u003c\/strong\u003e: 0.0002 inch (0.005 mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThrough Coolant\u003c\/strong\u003e: Yes\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\u003eBalanced To\u003c\/strong\u003e: 30,000 RPM\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\u003eWeight\u003c\/strong\u003e: 2.2 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: 772040\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"ACCUPRO","offers":[{"title":"Default Title","offer_id":51731609551154,"sku":"772040","price":117.17,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/079987ba95490517cafda31df0d9bc2d_0d6c1d7f-6ae5-4336-b518-34c9238562d7.jpg?v=1788733126","url":"https:\/\/voomisupply.com\/products\/accupro-772040-end-mill-holder-cat40-7-16-in-through-coolant","provider":"Voomi Supply","version":"1.0","type":"link"}