{"product_id":"collis-tool-68049-end-mill-holder-nmtb40-5-16-inch-bore","title":"Collis Tool 68049 End Mill Holder NMTB40 5\/16 Inch Bore","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe COLLIS TOOL 68049 is an end mill holder designed for use with NMTB40 taper shank spindles on vertical and horizontal milling machines. It accepts end mills with a 5\/16 inch bore and provides a 2.5 inch projection from the spindle face, giving the cutting tool adequate clearance for a wide range of milling operations. The nose diameter measures 1 inch. This holder is a solid, precision-machined toolholder used by machinists and CNC operators to securely mount end mills in milling machine spindles. It uses a 5\/8-11 drawbar thread for positive retention in the spindle.\u003c\/p\u003e\n\u003cp\u003eThe 68049 is suited for use on knee mills, Bridgeport-style machines, and other milling centers equipped with an NMTB40 (National Machine Tool Builders No. 40) taper spindle. The 2.5 inch projection makes it appropriate for general-purpose end milling, slotting, and profiling where moderate tool extension is needed. Through-coolant is not supported. This holder is typically selected by machinists, tool room operators, and CNC setup technicians when setting up end mill tooling on NMTB40 spindle machines.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eNMTB40 taper shank for direct spindle mounting on compatible machines\u003c\/li\u003e\n  \u003cli\u003e5\/16 inch bore accommodates standard 5\/16 inch shank end mills\u003c\/li\u003e\n  \u003cli\u003e2.5 inch projection from spindle face for clearance in typical milling setups\u003c\/li\u003e\n  \u003cli\u003e1 inch nose diameter for secure tool clamping\u003c\/li\u003e\n  \u003cli\u003e5\/8-11 drawbar thread for positive spindle retention\u003c\/li\u003e\n  \u003cli\u003eNo through-coolant  -  external coolant delivery required if needed\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned for use with milling machine spindles configured to the NMTB40 taper standard and equipped with a 5\/8-11 drawbar thread. Accepts end mills with a 5\/16 inch straight shank.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eInstallation is performed by qualified machinists or CNC setup technicians. Power down and lock out the machine spindle before inserting or removing any toolholder. Ensure the spindle taper and toolholder taper are clean and free of chips or oil before seating. Tighten the drawbar to the machine manufacturer's specified torque using the appropriate drawbar wrench  -  do not over-tighten or under-tighten.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\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: NMTB40\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBore Diameter\u003c\/strong\u003e: 5\/16 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNose Diameter\u003c\/strong\u003e: 1 inch\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eProjection\u003c\/strong\u003e: 2.5 inches\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\u003eThrough Coolant\u003c\/strong\u003e: No\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 1.75 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: COLLIS TOOL\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: 68049\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"COLLIS TOOL","offers":[{"title":"Default Title","offer_id":67906225701170,"sku":"68049","price":189.97,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/fbc64ca2dfd110ce05830b53f6ac9097.jpg?v=1791166291","url":"https:\/\/voomisupply.com\/products\/collis-tool-68049-end-mill-holder-nmtb40-5-16-inch-bore","provider":"Voomi Supply","version":"1.0","type":"link"}