{"product_id":"parlec-3003trkc-retention-knob-bt30-m12-x-1-75-through-coolant","title":"Parlec 3003TRKC Retention Knob BT30 M12 X 1.75 Through Coolant","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe PARLEC 3003TRKC is a BT30 retention knob designed to secure toolholders in BT30 spindle interfaces on CNC machining centers. It threads into the drawbar mechanism and pulls the toolholder taper firmly into the spindle bore, maintaining accurate tool positioning during cutting operations. The knob features a 45-degree angle radius, an M12 x 1.75 thread, and a knob diameter of 0.43 inches. A through-coolant passage with a 0.125-inch coolant hole diameter allows cutting fluid to be delivered directly through the toolholder, supporting high-efficiency machining where internal coolant delivery is required. Installation and removal are handled by machinists and CNC setup technicians.\u003c\/p\u003e\n\u003cp\u003eThis retention knob is suited for BT30 toolholding systems used in vertical and horizontal CNC machining centers running light to medium duty operations. The through-coolant design makes it appropriate for applications involving drills, reamers, and other tooling that benefits from internal coolant delivery. At 0.19 pounds, the knob adds minimal mass to the toolholder assembly. It is sold individually and is a direct-fit replacement for worn or damaged BT30 retention knobs in standard M12 x 1.75 drawbar systems.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eBT30 taper interface for compatibility with BT30 spindle systems\u003c\/li\u003e\n  \u003cli\u003eM12 x 1.75 thread matches standard BT30 drawbar thread specification\u003c\/li\u003e\n  \u003cli\u003e45-degree angle radius for proper seating and clamping force distribution\u003c\/li\u003e\n  \u003cli\u003eThrough-coolant capable with 0.125-inch coolant hole diameter\u003c\/li\u003e\n  \u003cli\u003eKnob to flange length of 0.908 inches and neck diameter of 0.273 inches for precise fitment\u003c\/li\u003e\n  \u003cli\u003eCompact 1.7-inch overall length suits space-constrained spindle environments\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned as a replacement retention knob for BT30 toolholders using an M12 x 1.75 drawbar thread. Verify drawbar thread specification and taper size against your spindle and toolholder before installation.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eRetention knobs are installed and serviced by qualified machinists or CNC toolroom technicians. Before removing or installing a retention knob, confirm the machine spindle is fully powered down and the drawbar is depressurized. Use the correct retention knob wrench or spanner to achieve proper torque without damaging the knob or toolholder threads. Inspect the toolholder taper and spindle bore for contamination or wear before reassembly.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTaper Size\u003c\/strong\u003e: BT30\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThread Size\u003c\/strong\u003e: M12 x 1.75\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOverall Length\u003c\/strong\u003e: 1.7 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eKnob Diameter\u003c\/strong\u003e: 0.43 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNeck Diameter\u003c\/strong\u003e: 0.273 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eKnob to Flange Length\u003c\/strong\u003e: 0.908 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: 0.125 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.19 pounds\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: 3003TRKC\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"PARLEC","offers":[{"title":"Default Title","offer_id":51986082300210,"sku":"3003TRKC","price":54.53,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/6ccfd7f8af423d1d577989cee9df41fd.jpg?v=1789985911","url":"https:\/\/voomisupply.com\/products\/parlec-3003trkc-retention-knob-bt30-m12-x-1-75-through-coolant","provider":"Voomi Supply","version":"1.0","type":"link"}