{"product_id":"accupro-772178-end-mill-holder-cat50-1-inch-hole","title":"Accupro 772178 End Mill Holder CAT50 1 Inch Hole","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe ACCUPRO 772178 is a CAT50 taper shank end mill holder designed for use in CNC machining centers where secure tooling and precise runout control are critical. It accepts a 1 inch bore diameter and delivers a 4 inch projection from the spindle face, making it suitable for applications requiring extended reach. The holder features through-coolant capability, supporting both through-spindle and DIN flange coolant delivery. With a total indicated runout (TIR) of 0.0002 inches, it is built for operations where dimensional accuracy and surface finish are priorities. The unit weighs 9.2 pounds and measures 8 inches in overall length.\u003c\/p\u003e\u003cp\u003eThis holder is intended for use in production and job-shop machining environments running CAT50-equipped vertical or horizontal machining centers. It is installed by machinists and tool crib personnel setting up end milling operations in ferrous and non-ferrous material cutting. The 2-23\/64 inch nose diameter and 2.36 inch clamping depth provide a stable grip on standard shank end mills. The holder is balanced to 25,000 RPM, making it appropriate for high-speed machining applications where vibration and tool runout directly affect part quality and insert life.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eCAT50 taper shank for compatibility with standard CAT50 spindle interfaces\u003c\/li\u003e\n\u003cli\u003e1 inch bore diameter with 2.36 inch clamping depth for secure end mill retention\u003c\/li\u003e\n\u003cli\u003e4 inch projection for extended reach milling setups\u003c\/li\u003e\n\u003cli\u003eThrough-coolant support via through-spindle and DIN flange coolant types\u003c\/li\u003e\n\u003cli\u003eTIR of 0.0002 inches for high-precision runout performance\u003c\/li\u003e\n\u003cli\u003eBalanced to 25,000 RPM for high-speed machining center use\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned as an OEM-style toolholder for CAT50 spindle machining centers accepting standard 1 inch shank end mills with a 1-8 retention knob thread size.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eInstallation should be performed by a qualified machinist or tool crib technician with the machine in an e-stopped and locked-out state per applicable machine tool safety procedures. Verify spindle cleanliness and taper condition before seating the holder. Use a torque wrench and the correct retention knob specification for the target spindle; do not over-tighten the drawbar. Confirm runout at the bore before production use.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eShank Type\u003c\/strong\u003e: CAT50 Taper\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHole Diameter\u003c\/strong\u003e: 1 inch\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProjection\u003c\/strong\u003e: 4 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNose Diameter\u003c\/strong\u003e: 2-23\/64 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOverall Length\u003c\/strong\u003e: 8 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClamping Depth\u003c\/strong\u003e: 2.36 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\u003eThrough Coolant\u003c\/strong\u003e: Yes\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRetention Knob Thread Size\u003c\/strong\u003e: 1-8\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBalanced To\u003c\/strong\u003e: 25,000 RPM\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 9.2 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePackage Dimensions\u003c\/strong\u003e: 9.5 inches L x 4.5 inches W x 4.5 inches H\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: 772178\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"ACCUPRO","offers":[{"title":"Default Title","offer_id":51730466537778,"sku":"772178","price":208.53,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/b97ac3ed940707e749ac0b2559f5acbf.jpg?v=1788717944","url":"https:\/\/voomisupply.com\/products\/accupro-772178-end-mill-holder-cat50-1-inch-hole","provider":"Voomi Supply","version":"1.0","type":"link"}