{"product_id":"parlec-4001trkc-cat40-retention-knob-5-8-11-thread","title":"Parlec 4001TRKC CAT40 Retention Knob 5\/8-11 Thread","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe PARLEC 4001TRKC is a CAT40 retention knob designed to secure toolholders in CNC machining center spindles with automatic tool changers. Threaded 5\/8-11 to mate with CAT40 toolholder drawbars, this Style B knob features a 90-degree angle radius and through-coolant capability with a 0.197-inch coolant hole diameter. Overall length is 2.3 inches, with a knob diameter of 0.588 inches and a pilot diameter of 0.635 inches. Weighing 1 pound, it is installed by CNC machinists and toolroom technicians as part of routine toolholder assembly or replacement.\u003c\/p\u003e\n\u003cp\u003eThis retention knob is suited for CAT40 toolholders used in vertical and horizontal machining centers equipped with automatic tool changers. The through-coolant design supports directed coolant flow to the cutting zone, making it appropriate for applications involving high-speed machining, deep-hole drilling, or other operations that benefit from internal coolant delivery. The Style B profile matches spindle and drawbar configurations that require this specific knob geometry.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eCAT40 taper size for compatibility with standard CAT40 toolholder shanks\u003c\/li\u003e\n  \u003cli\u003e5\/8-11 thread size for positive drawbar engagement\u003c\/li\u003e\n  \u003cli\u003eThrough-coolant capable with 0.197-inch coolant hole diameter\u003c\/li\u003e\n  \u003cli\u003e90-degree angle radius for proper drawbar seating\u003c\/li\u003e\n  \u003cli\u003eStyle B profile for specific spindle and drawbar fitment\u003c\/li\u003e\n  \u003cli\u003eCompact flange thickness of 0.23 inches for precise toolholder registration\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned as a replacement or spare retention knob for CAT40 toolholders used in CNC machining centers with 5\/8-11 drawbar threads and Style B knob requirements.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eRetention knobs are installed by machinists or toolroom personnel during toolholder assembly. Always de-energize and lock out the machine spindle before servicing toolholders or installing retention knobs. Use the correct torque wrench and follow the toolholder manufacturer's torque specification for 5\/8-11 retention knobs to avoid over-tightening, which can cause drawbar damage or difficult tool release. Inspect the knob threads and toolholder bore for damage or contamination before installation.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTaper Size\u003c\/strong\u003e: CAT40\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThread Size\u003c\/strong\u003e: 5\/8-11\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: 2.3 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eKnob Diameter\u003c\/strong\u003e: 0.588 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNeck Diameter\u003c\/strong\u003e: 0.393 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePilot Diameter\u003c\/strong\u003e: 0.635 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eKnob to Flange Length\u003c\/strong\u003e: 1.275 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFlange Thickness\u003c\/strong\u003e: 0.23 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: Yes\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCoolant Hole Diameter\u003c\/strong\u003e: 0.197 inches\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: 4001TRKC\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"PARLEC","offers":[{"title":"Default Title","offer_id":52092351185202,"sku":"4001TRKC","price":68.56,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/a95270b0628c67c8475c4d5dd3749f84.jpg?v=1790063756","url":"https:\/\/voomisupply.com\/products\/parlec-4001trkc-cat40-retention-knob-5-8-11-thread","provider":"Voomi Supply","version":"1.0","type":"link"}