{"product_id":"accupro-775205-end-mill-holder-bt40-3-16-in-through-coolant","title":"Accupro 775205 End Mill Holder BT40 3\/16 in Through Coolant","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe ACCUPRO 775205 is a BT40 taper shank end mill holder designed for CNC machining centers requiring precise tool holding with through-coolant capability. The holder accepts a 3\/16 inch bore diameter and delivers a 4 inch projection from the spindle face, positioning cutting tools at the correct depth for a wide range of milling operations. With a total indicator reading (TIR) of 0.0002 inches, this holder maintains tight runout tolerances critical for finishing passes and small-diameter end mill applications. A 3\/4 inch nose diameter and M16 x 2.0 drawbar thread complete the interface. Installation and use are appropriate for machinists and CNC operators working in job shop or production environments.\u003c\/p\u003e\u003cp\u003eThis end mill holder is suited for vertical and horizontal machining centers equipped with BT40 spindle interfaces. The through-coolant design supports both through-spindle and DIN flange coolant delivery, making it applicable in operations where chip evacuation and tool life depend on directed coolant flow at the cutting zone. The 4 inch projection provides clearance for deep-cavity work or fixtures that require additional reach without the use of extension adapters. Balanced to 30,000 RPM, this holder is compatible with high-speed machining applications common in aerospace, mold and die, and precision part manufacturing.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eBT40 taper shank for direct spindle mounting on BT40-equipped machining centers\u003c\/li\u003e\n\u003cli\u003e3\/16 inch bore accepts small-diameter end mills with precision fit\u003c\/li\u003e\n\u003cli\u003eTIR of 0.0002 inches ensures low runout for accurate cuts and extended tool life\u003c\/li\u003e\n\u003cli\u003eThrough-coolant compatible via through-spindle and DIN flange coolant delivery\u003c\/li\u003e\n\u003cli\u003eBalanced to 30,000 RPM for high-speed machining without vibration-induced error\u003c\/li\u003e\n\u003cli\u003eM16 x 2.0 drawbar thread for secure, standardized spindle retention\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned for use with BT40 taper spindle machining centers that support through-spindle or DIN flange coolant delivery and an M16 x 2.0 drawbar thread.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eInstallation should be performed by a qualified machinist or CNC setup technician with the machine powered down and the spindle fully de-energized before tooling changes. Use the appropriate BT40 tool setter or holder tightening fixture to torque the drawbar to the machining center manufacturer's specification — do not use impact tools on the drawbar. Verify runout with a dial test indicator after seating the holder to confirm the TIR is within tolerance before initiating a cutting cycle. Inspect coolant passages for obstructions before use if through-coolant operation is required.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eShank Type\u003c\/strong\u003e: Taper\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTaper Size\u003c\/strong\u003e: BT40\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHole Diameter\u003c\/strong\u003e: 3\/16 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNose Diameter\u003c\/strong\u003e: 3\/4 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProjection\u003c\/strong\u003e: 4 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTIR\u003c\/strong\u003e: 0.0002 inches\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\u003eDrawbar Thread Size\u003c\/strong\u003e: M16 x 2.0\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: 1 pound\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: 775205\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"ACCUPRO","offers":[{"title":"Default Title","offer_id":51747626778930,"sku":"775205","price":150.93,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/a800d5b2757dff90de6c51293441ce02.jpg?v=1788883705","url":"https:\/\/voomisupply.com\/products\/accupro-775205-end-mill-holder-bt40-3-16-in-through-coolant","provider":"Voomi Supply","version":"1.0","type":"link"}