{"product_id":"parlec-5001trk-retention-knob-cat50-1-8-thread","title":"Parlec 5001TRK Retention Knob CAT50 1-8 Thread","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe PARLEC 5001TRK is a Style B retention knob designed for CAT50 toolholders used in CNC machining centers. It features a 1-8 inch thread and a 90-degree angle radius, providing secure tool clamping at the spindle interface. With a knob diameter of 0.904 inches, a pilot diameter of 1.026 inches, and an overall length of 3.31 inches, this retention knob is built to maintain precise axial positioning during high-speed milling, boring, and drilling operations. Machinists and toolroom technicians install these components when setting up or replacing worn drawbar hardware on CAT50 spindle systems.\u003c\/p\u003e\n\u003cp\u003eThis retention knob is intended for use in CAT50 spindle toolholder assemblies on vertical and horizontal CNC machining centers. The 1-8 thread size mates directly with the drawbar mechanism inside the spindle. The knob does not include through-coolant capability, making it suited for dry or flood-coolant setups where internal coolant delivery through the retention knob is not required. It is a direct-fit replacement or new-build component for shops running CAT50 tooling systems.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eCAT50 taper size for compatibility with standard CAT50 spindle drawbar systems\u003c\/li\u003e\n  \u003cli\u003e1-8 inch thread size for direct drawbar engagement\u003c\/li\u003e\n  \u003cli\u003e90-degree angle radius for proper seating geometry\u003c\/li\u003e\n  \u003cli\u003eStyle B design with 0.904-inch knob diameter and 1.026-inch pilot diameter\u003c\/li\u003e\n  \u003cli\u003eKnob-to-flange length of 1.77 inches and flange thickness of 0.39 inches for precise axial positioning\u003c\/li\u003e\n  \u003cli\u003eNo through-coolant passage, suitable for standard flood or dry machining environments\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned as a direct-fit retention knob for CAT50 toolholder assemblies used in CNC machining center spindles requiring a 1-8 thread drawbar connection.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eRetention knobs are installed by qualified machinists or toolroom technicians. Always power down the machine and confirm the spindle is fully stopped before removing or installing a retention knob. Use the appropriate spanner or retention knob wrench to achieve proper torque without over-tightening the thread. Inspect the drawbar thread condition before installation to ensure a clean, undamaged mating interface.\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\u003eStyle\u003c\/strong\u003e: B\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOverall Length\u003c\/strong\u003e: 3.31 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eKnob Diameter\u003c\/strong\u003e: 0.904 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePilot Diameter\u003c\/strong\u003e: 1.026 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNeck Diameter\u003c\/strong\u003e: 0.667 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eKnob to Flange Length\u003c\/strong\u003e: 1.77 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFlange Thickness\u003c\/strong\u003e: 0.39 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eAngle Radius\u003c\/strong\u003e: 90 degrees\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 pound\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: PARLEC\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: 5001TRK\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"PARLEC","offers":[{"title":"Default Title","offer_id":52016821567794,"sku":"5001TRK","price":43.56,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/dde9399439b81946d2663a5f01a6ecd4.jpg?v=1790008946","url":"https:\/\/voomisupply.com\/products\/parlec-5001trk-retention-knob-cat50-1-8-thread","provider":"Voomi Supply","version":"1.0","type":"link"}