{"product_id":"accupro-778398-end-mill-holder-hsk63a-1-2-inch-hole","title":"Accupro 778398 End Mill Holder HSK63A 1\/2 Inch Hole","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe ACCUPRO 778398 is an HSK63A taper shank end mill holder designed for CNC machining centers requiring high-speed, high-precision tool holding. The holder accepts a 1\/2 inch bore and delivers a 4 inch projection from the gauge line, with a 1-1\/4 inch nose diameter. It is balanced to 20,000 RPM and achieves a Total Indicator Runout (TIR) of 0.003 mm, making it well-suited for finishing operations and tight-tolerance work. Machinists and CNC setup technicians install this holder as part of the spindle tooling assembly on machines equipped with HSK63A spindle interfaces.\u003c\/p\u003e\u003cp\u003eThis end mill holder is intended for use on CNC vertical and horizontal machining centers with HSK63A spindle tapers. The HSK63A interface provides simultaneous taper and face contact for improved rigidity and repeatability at elevated spindle speeds. The 4 inch projection is appropriate for applications requiring additional reach, such as deep-cavity milling or workpiece clearance situations. It does not include through-coolant capability, so it is best matched to operations using flood or mist cooling rather than spindle-through coolant delivery.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eHSK63A taper shank with simultaneous taper and face contact for high rigidity\u003c\/li\u003e\n\u003cli\u003e1\/2 inch bore diameter for standard end mill shanks\u003c\/li\u003e\n\u003cli\u003e4 inch projection provides extended reach for deep-cavity applications\u003c\/li\u003e\n\u003cli\u003e1-1\/4 inch nose diameter\u003c\/li\u003e\n\u003cli\u003eBalanced to 20,000 RPM for high-speed machining compatibility\u003c\/li\u003e\n\u003cli\u003eTIR of 0.003 mm for precise tool runout control\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned for use with CNC machining centers equipped with an HSK63A spindle interface accepting 1\/2 inch shank end mills.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eInstallation should be performed by a qualified CNC machinist or tooling technician. The spindle must be fully stopped and the machine placed in an E-stop or lockout\/tagout state before changing tooling. Use the appropriate HSK clamping tool and torque wrench as specified by the machine manufacturer when securing the holder in the spindle. Verify runout with a dial indicator after installation 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: HSK63A Taper\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHole Diameter\u003c\/strong\u003e: 0.5 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNose Diameter\u003c\/strong\u003e: 1.25 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: 0.003 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBalanced To\u003c\/strong\u003e: 20,000 RPM\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThrough Coolant\u003c\/strong\u003e: No\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 3 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: 778398\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"ACCUPRO","offers":[{"title":"Default Title","offer_id":51754359914802,"sku":"778398","price":337.8,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/152cb51f01c1c5822657cd57044ff077_44236f47-bca8-4573-a75d-90269c5229ac.jpg?v=1788944697","url":"https:\/\/voomisupply.com\/products\/accupro-778398-end-mill-holder-hsk63a-1-2-inch-hole","provider":"Voomi Supply","version":"1.0","type":"link"}