{"product_id":"parlec-40trk-cat40-retention-knob-5-8-11-thread-through-coolant","title":"Parlec 40TRK CAT40 Retention Knob 5\/8-11 Thread Through Coolant","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe PARLEC 40TRK is a CAT40 retention knob designed to secure toolholders in CNC machining center spindles that use the CAT40 taper interface. It threads into the drawbar at 5\/8-11 and locks the toolholder in place during cutting operations. The 40TRK features a 45-degree angle radius at the knob head and a through-coolant passage with a 0.281-inch coolant hole diameter, making it compatible with machines that deliver coolant through the spindle. At 1.68 inches overall length and 0.1 pounds, this is a standard Style A retention knob suited for production and job-shop environments. Machinists and toolroom technicians install this knob as a direct-fit component in CAT40 tooling assemblies.\u003c\/p\u003e\n\u003cp\u003eThe 40TRK is used in vertical and horizontal machining centers equipped with CAT40 spindle tapers. It is appropriate for both production and prototype environments where reliable toolholder retention and through-spindle coolant delivery are required. The 0.74-inch knob diameter, 0.635-inch pilot diameter, and 0.64-inch knob-to-flange length conform to standard CAT40 geometry, ensuring consistent drawbar engagement across machines built to that specification. This knob is installed in the threaded bore at the top of a CAT40 toolholder shank.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eCAT40 taper size for use with standard CAT40 toolholders and spindles\u003c\/li\u003e\n  \u003cli\u003e5\/8-11 thread engages standard CAT40 drawbar hardware\u003c\/li\u003e\n  \u003cli\u003eThrough-coolant capable with a 0.281-inch coolant hole diameter for spindle-through coolant delivery\u003c\/li\u003e\n  \u003cli\u003e45-degree angle radius knob head conforms to Style A geometry\u003c\/li\u003e\n  \u003cli\u003e0.49-inch neck diameter and 0.635-inch pilot diameter provide accurate seating and drawbar alignment\u003c\/li\u003e\n  \u003cli\u003eLightweight at 0.1 pounds with a compact 1.68-inch overall length\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned as a direct-fit retention knob for CAT40 toolholders using a 5\/8-11 drawbar thread, compatible with CNC machining center spindles built to the CAT40 taper standard.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eInstallation is performed by machinists or toolroom technicians using a retention knob wrench or appropriate spanner. The spindle must be fully stopped and the machine placed in an e-stop or lockout\/tagout state before handling toolholders or retention hardware. Torque the knob to the toolholder manufacturer specification using a calibrated torque tool. Inspect the knob threads and toolholder bore threads for damage or contamination before assembly to avoid drawbar engagement issues.\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: A\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOverall Length\u003c\/strong\u003e: 1.68 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eKnob Diameter\u003c\/strong\u003e: 0.74 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNeck Diameter\u003c\/strong\u003e: 0.49 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: 0.64 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFlange Thickness\u003c\/strong\u003e: 0.12 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: 0.281 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.1 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: PARLEC\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: 40TRK\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"PARLEC","offers":[{"title":"Default Title","offer_id":52027551088946,"sku":"40TRK","price":41.09,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/703c876bbc08546f842190eacbbc9fda.jpg?v=1790017173","url":"https:\/\/voomisupply.com\/products\/parlec-40trk-cat40-retention-knob-5-8-11-thread-through-coolant","provider":"Voomi Supply","version":"1.0","type":"link"}