{"product_id":"accupro-88-113-50-ap-retention-knob-cat50-1-8-thread","title":"Accupro 88.113.50.AP Retention Knob CAT50 1-8 Thread","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe ACCUPRO 88.113.50.AP is a CAT50 retention knob engineered for use in CNC machining centers that use the CAT50 taper toolholder standard. It features a 1-8 inch thread, a knob diameter of 0.9055 inches, and an overall length of 3.3524 inches. The through-coolant design includes a coolant hole diameter of 0.1969 inches, allowing coolant to pass directly through the toolholder assembly to the cutting zone. High-torque construction provides secure clamping force under demanding cutting conditions. This knob is installed by machinists and toolroom technicians during toolholder assembly or replacement.\u003c\/p\u003e\n\u003cp\u003eThis retention knob is suited for CAT50 toolholder assemblies used in heavy-duty vertical and horizontal machining centers. The Style B configuration, 90-degree angle radius, and precise dimensional tolerances make it a reliable choice for production environments where toolholder pullout or vibration are concerns. Knob-to-flange length measures 1.7775 inches and flange thickness is 1.3839 inches, with a neck diameter of 0.6693 inches. Typical applications include production milling, boring, and drilling operations on machines equipped with CAT50 spindles.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eCAT50 taper size for compatibility with CAT50 spindle toolholder systems\u003c\/li\u003e\n  \u003cli\u003e1-8 inch thread for secure engagement with the drawbar mechanism\u003c\/li\u003e\n  \u003cli\u003eThrough-coolant capable with a 0.1969 inch coolant hole diameter\u003c\/li\u003e\n  \u003cli\u003eHigh-torque construction for reliable clamping under heavy cutting loads\u003c\/li\u003e\n  \u003cli\u003eStyle B design with 90-degree angle radius for precise seating\u003c\/li\u003e\n  \u003cli\u003eCompact 0.6693 inch neck diameter reduces interference in tight toolholder configurations\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned as a replacement or spare retention knob for CAT50 taper toolholder assemblies used in CNC machining centers equipped with CAT50 spindles and 1-8 drawbar threads.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eRetention knobs are installed by qualified machinists or toolroom technicians. Before replacing a retention knob, ensure the machine spindle is fully de-energized and the drawbar mechanism is disengaged. Use the appropriate spanner or retention knob installation tool to achieve proper torque without damaging the thread engagement. Do not install a retention knob without verifying that the thread specification of the knob matches the drawbar of the host machine.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTaper Size\u003c\/strong\u003e: CAT50\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThread Size\u003c\/strong\u003e: 1-8 inch\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOverall Length\u003c\/strong\u003e: 3.3524 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eKnob Diameter\u003c\/strong\u003e: 0.9055 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNeck Diameter\u003c\/strong\u003e: 0.6693 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eKnob to Flange Length\u003c\/strong\u003e: 1.7775 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFlange Thickness\u003c\/strong\u003e: 1.3839 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCoolant Hole Diameter\u003c\/strong\u003e: 0.1969 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eAngle Radius\u003c\/strong\u003e: 90 degrees\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eStyle\u003c\/strong\u003e: B\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThrough Coolant\u003c\/strong\u003e: Yes\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHigh Torque\u003c\/strong\u003e: Yes\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.25 pounds\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eUNSPSC Code\u003c\/strong\u003e: 27112800\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: 88.113.50.AP\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"ACCUPRO","offers":[{"title":"Default Title","offer_id":51727294955826,"sku":"88.113.50.AP","price":38.39,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/dfee8787ad4bd9b4df3c1df0af31fbf0.jpg?v=1788675987","url":"https:\/\/voomisupply.com\/products\/accupro-88-113-50-ap-retention-knob-cat50-1-8-thread","provider":"Voomi Supply","version":"1.0","type":"link"}