{"product_id":"accupro-777674-bt40-milling-chuck-3-4-in-through-coolant","title":"Accupro 777674 BT40 Milling Chuck 3\/4 in Through Coolant","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe ACCUPRO 777674 is a BT40 taper milling chuck designed for CNC machining centers that require secure tool holding with integrated through-coolant delivery. The chuck accepts a 3\/4 inch (0.7500 inch) hole diameter and features a 2.05 inch nose diameter with a 4.13 inch projection length. It achieves a total indicator reading (TIR) of 0.0002 inch, making it suitable for precision milling operations where runout control is critical. The unit is balanced to 10,000 RPM and supports both through-spindle coolant and DIN flange coolant configurations. Machinists and CNC setup technicians typically install and service this toolholder.\u003c\/p\u003e\n\u003cp\u003eThis chuck is suited for use in BT40-spindle CNC vertical and horizontal machining centers across production and job-shop environments. It is commonly used in applications involving end mills, reamers, and similar cutting tools requiring a collet-style chuck interface. The 3.15 inch clamping depth provides solid tool engagement for demanding metal removal operations. Through-coolant capability makes it effective in applications where chip evacuation and tool cooling at the cutting zone are priorities.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eBT40 taper shank for direct spindle interface on BT40-equipped machining centers\u003c\/li\u003e\n  \u003cli\u003e3\/4 inch (0.7500 inch) hole diameter for standard end mill and tooling shanks\u003c\/li\u003e\n  \u003cli\u003eTIR of 0.0002 inch for precision runout control during milling operations\u003c\/li\u003e\n  \u003cli\u003eBalanced to 10,000 RPM for stable high-speed machining\u003c\/li\u003e\n  \u003cli\u003eThrough-spindle and DIN flange coolant compatibility for improved chip evacuation and tool life\u003c\/li\u003e\n  \u003cli\u003e3.15 inch clamping depth for secure tool engagement and reduced pullout risk\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned as an OEM-style toolholder for CNC machining centers equipped with a BT40 taper spindle interface.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eInstallation and tool changes should be performed by a qualified machinist or CNC setup technician with the spindle powered down and the machine in a safe, locked-out state per facility lockout\/tagout procedures. Use an appropriate BT40 retention knob and torque the drawbar or toolholder retention mechanism according to the machining center manufacturer specifications. Verify runout with a dial indicator after seating the chuck before initiating any cutting operation. Inspect the taper bore and spindle taper for contamination or damage before each installation.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTaper Size\u003c\/strong\u003e: BT40\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eShank Type\u003c\/strong\u003e: Taper\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHole Diameter\u003c\/strong\u003e: 0.7500 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNose Diameter\u003c\/strong\u003e: 2.0500 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eProjection\u003c\/strong\u003e: 4.1300 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eClamping Depth\u003c\/strong\u003e: 3.1500 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTIR\u003c\/strong\u003e: 0.0002 inches\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: 10,000 RPM\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 4.25 pounds\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eStandard Information\u003c\/h4\u003e\n\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: 777674\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"ACCUPRO","offers":[{"title":"Default Title","offer_id":51739784773938,"sku":"777674","price":386.91,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/3ba27b962ee335043e4728b7299ffa02.jpg?v=1788818826","url":"https:\/\/voomisupply.com\/products\/accupro-777674-bt40-milling-chuck-3-4-in-through-coolant","provider":"Voomi Supply","version":"1.0","type":"link"}