{"product_id":"robbjack-ach-08-end-mill-holder-5-8-in-weldon-flat","title":"Robbjack ACH-08 End Mill Holder 5\/8 in Weldon Flat","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe ROBBJACK ACH-08 is a Weldon flat straight shank end mill holder designed for secure tool retention in CNC machining centers and manual milling machines. It accepts a 1\/4 inch bore and features a 5\/8 inch shank diameter with a through-coolant channel that delivers cutting fluid directly to the tool tip. With an overall length of 4.25 inches, this holder provides the reach and rigidity needed for general-purpose milling operations. Machinists and CNC setup technicians install this holder when running end mills that require high clamping force and precise concentricity.\u003c\/p\u003e\n\u003cp\u003eThis end mill holder suits production and job-shop environments where through-coolant capability is required for extended tool life and chip evacuation. The Weldon flat drive design provides positive engagement between the set screw and the tool shank, reducing pull-out risk under aggressive cutting conditions. Typical applications include ferrous and non-ferrous milling in vertical machining centers. Weighing 0.25 pounds, it is a compact, lightweight holder suited to smaller-diameter tooling setups.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eThrough-coolant channel directs fluid to the cutting zone for improved tool life and chip removal\u003c\/li\u003e\n  \u003cli\u003eWeldon flat straight shank design provides positive set-screw engagement to resist tool pull-out\u003c\/li\u003e\n  \u003cli\u003e5\/8 inch shank diameter for use in standard milling machine spindles accepting that bore size\u003c\/li\u003e\n  \u003cli\u003e1\/4 inch tool bore accommodates standard 1\/4 inch shank end mills\u003c\/li\u003e\n  \u003cli\u003e4.25 inch overall length offers reach for a range of workpiece configurations\u003c\/li\u003e\n  \u003cli\u003eLightweight at 0.25 pounds, minimizing added spindle load\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned as an OEM-style end mill holder for milling machines and CNC machining centers that accept a 5\/8 inch straight shank tool holder with Weldon flat drive and a 1\/4 inch tool bore.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eInstallation should be performed by a qualified machinist or CNC setup technician with the spindle fully powered down and locked out per the machine tool manufacturer's lockout\/tagout procedure. Insert the end mill shank fully into the bore before tightening the set screw against the Weldon flat. Verify through-coolant port alignment with the machine spindle coolant passage before final assembly. Inspect the bore and shank for burrs or contamination prior to assembly to maintain concentricity.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eShank Type\u003c\/strong\u003e: Weldon Flat Straight\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eShank Diameter\u003c\/strong\u003e: 5\/8 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHole Diameter\u003c\/strong\u003e: 1\/4 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOverall Length\u003c\/strong\u003e: 4.25 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThrough Coolant\u003c\/strong\u003e: Yes\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.25 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: ROBBJACK\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: ACH-08\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"ROBBJACK","offers":[{"title":"Default Title","offer_id":51972011819314,"sku":"ACH-08","price":374.9,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/2f98b845b938f3b24841fe6937c7e602.jpg?v=1789960927","url":"https:\/\/voomisupply.com\/products\/robbjack-ach-08-end-mill-holder-5-8-in-weldon-flat","provider":"Voomi Supply","version":"1.0","type":"link"}