{"product_id":"parlec-toy050trk-retention-knob-cat50-1-8-thread","title":"Parlec TOY050TRK Retention Knob CAT50 1-8 Thread","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe PARLEC TOY050TRK is a CAT50 retention knob designed to secure toolholders in CAT50 spindle tapers on CNC machining centers. It features a 1-8 UNC thread for positive engagement with the drawbar, a 45-degree angle radius, and through-coolant capability with a 0.236-inch coolant hole diameter. The Style I knob measures 3.355 inches overall length with a 0.905-inch knob diameter, making it a direct-fit component for high-speed machining applications where secure tool retention and coolant delivery are both required. Licensed machinists and CNC setup technicians are the primary installers of this component.\u003c\/p\u003e\u003cp\u003eThis retention knob is used in CAT50 toolholding systems on vertical and horizontal machining centers in production and job-shop environments. The through-coolant design supports applications where directed coolant flow through the toolholder to the cutting tool is needed, such as drilling, reaming, or tapping operations with coolant-through toolholders. It fits CAT50 spindle configurations requiring a 1-8 thread drawbar engagement and a 1.031-inch pilot diameter interface.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eCAT50 taper size for use with CAT50 spindle toolholding systems\u003c\/li\u003e\n\u003cli\u003e1-8 UNC thread for drawbar engagement\u003c\/li\u003e\n\u003cli\u003eThrough-coolant capable with 0.236-inch coolant hole diameter\u003c\/li\u003e\n\u003cli\u003e45-degree angle radius for consistent seating and retention force\u003c\/li\u003e\n\u003cli\u003eStyle I configuration with 0.905-inch knob diameter and 1.031-inch pilot diameter\u003c\/li\u003e\n\u003cli\u003eCompact neck diameter of 0.670 inches reduces interference risk during toolchange\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned for use with CAT50 toolholders requiring a 1-8 UNC threaded retention knob with a 1.031-inch pilot diameter and through-coolant passage, in machining centers equipped with CAT50 spindle tapers.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eRetention knobs should be installed and torqued by a qualified machinist or CNC toolroom technician using an appropriate retention knob wrench. Always remove the toolholder from the spindle and ensure the machine is in a safe, powered-down state before servicing retention knobs. Do not use pipe wrenches or improvised tools on the knob body, as this can damage the seating surfaces. Inspect threads on both the retention knob and drawbar for wear or damage before installation.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\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 UNC\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStyle\u003c\/strong\u003e: I\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOverall Length\u003c\/strong\u003e: 3.355 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eKnob Diameter\u003c\/strong\u003e: 0.905 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eKnob to Flange Length\u003c\/strong\u003e: 1.780 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlange Thickness\u003c\/strong\u003e: 0.402 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNeck Diameter\u003c\/strong\u003e: 0.670 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePilot Diameter\u003c\/strong\u003e: 1.031 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAngle Radius\u003c\/strong\u003e: 45 degrees\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThrough Coolant\u003c\/strong\u003e: Yes\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCoolant Hole Diameter\u003c\/strong\u003e: 0.236 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.6 pounds\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eStandard Information\u003c\/h4\u003e\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: TOY050TRK\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"PARLEC","offers":[{"title":"Default Title","offer_id":52045217038642,"sku":"TOY050TRK","price":66.41,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/38dcf63e8a994109678f4bbf62aa0e09.jpg?v=1790030386","url":"https:\/\/voomisupply.com\/products\/parlec-toy050trk-retention-knob-cat50-1-8-thread","provider":"Voomi Supply","version":"1.0","type":"link"}