{"product_id":"parlec-5004trk-retention-knob-bt50-0-904-in-knob-m24-thread","title":"Parlec 5004TRK Retention Knob BT50 0.904 in Knob M24 Thread","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe PARLEC 5004TRK is a Style C retention knob designed for BT50 taper toolholders used in CNC machining centers. It threads into the drawbar mechanism of the spindle, securing the toolholder during high-speed cutting operations. Manufactured to close dimensional tolerances, the 5004TRK features a 0.904-inch knob diameter, a 3.34-inch overall length, and an M24 x 3.00 thread size. The 60-degree angle radius on the knob engages the drawbar gripper consistently, reducing the risk of pull-out under cutting loads. This knob is installed and torqued by CNC setup technicians and toolroom machinists.\u003c\/p\u003e\n\u003cp\u003eThe 5004TRK is intended for use with BT50 taper toolholders in horizontal and vertical machining centers that accept BT50 spindle interfaces. The BT50 taper is common in heavy-duty production machining environments where larger diameter tooling and higher torque capacity are required. The 0.983-inch pilot diameter and 1.77-inch knob-to-flange length are dimensioned to fit standard BT50 holder bodies. This knob is a direct replacement component used during toolholder rebuild or when an existing retention knob shows wear, damage, or thread degradation.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eBT50 taper interface for compatibility with BT50 toolholder bodies\u003c\/li\u003e\n  \u003cli\u003eM24 x 3.00 thread engages standard BT50 drawbar systems\u003c\/li\u003e\n  \u003cli\u003e60-degree angle radius for consistent drawbar gripper engagement\u003c\/li\u003e\n  \u003cli\u003e0.904-inch knob diameter and 0.983-inch pilot diameter for proper spindle seating\u003c\/li\u003e\n  \u003cli\u003eStyle C geometry with 0.667-inch neck diameter and 0.39-inch flange thickness\u003c\/li\u003e\n  \u003cli\u003e3.34-inch overall length fits standard BT50 holder pull-stud pockets\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned as a direct-fit replacement retention knob for BT50 taper toolholders requiring an M24 x 3.00 thread and Style C knob geometry.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eRetention knobs are installed by CNC toolroom technicians using a retention knob torque wrench or spanner appropriate for the M24 thread. Always clean the threads on both the knob and toolholder bore before installation to prevent galling. Torque the knob to the toolholder manufacturer's specified value using a calibrated torque wrench  -  do not rely on impact tools. Inspect the knob and drawbar contact surfaces for wear during every toolholder service interval.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTaper Size\u003c\/strong\u003e: BT50\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThread Size\u003c\/strong\u003e: M24 x 3.00\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eStyle\u003c\/strong\u003e: C\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: 0.983 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\u003eOverall Length\u003c\/strong\u003e: 3.34 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eAngle Radius\u003c\/strong\u003e: 60 degrees\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: 5004TRK\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"PARLEC","offers":[{"title":"Default Title","offer_id":52054068756786,"sku":"5004TRK","price":62.12,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/145fabacfd55f4a7247b55572007100e.jpg?v=1790036582","url":"https:\/\/voomisupply.com\/products\/parlec-5004trk-retention-knob-bt50-0-904-in-knob-m24-thread","provider":"Voomi Supply","version":"1.0","type":"link"}