{"product_id":"seco-03119965-cat40-retention-knob-45-degree-m16x2-through-coolant","title":"Seco 03119965 CAT40 Retention Knob 45 Degree M16x2 Through Coolant","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe SECO 03119965 is a CAT40 retention knob designed to secure toolholders in CAT40 spindle taper machines during milling and machining operations. It features a 45-degree angle radius and an M16x2 thread for positive engagement with the drawbar. The knob diameter measures 0.74 inches, with a neck diameter of 0.492 inches and a knob-to-flange length of 0.642 inches. Overall length is 1.65 inches. Through-coolant capability is built in, allowing coolant delivery directly through the toolholder assembly. Installation and removal is handled by machinists or toolroom technicians during toolholder changes or spindle service.\u003c\/p\u003e\u003cp\u003eThis retention knob is suited for CNC machining centers and vertical or horizontal mills equipped with CAT40 spindle interfaces. It is a standard component used in production and job-shop environments where CAT40 toolholders are the shop standard. The through-coolant feature makes it appropriate for applications where internal coolant delivery to the cutting tool is required, such as deep-hole drilling or high-speed finishing operations.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eCAT40 taper size for direct compatibility with CAT40 spindle toolholders\u003c\/li\u003e\n\u003cli\u003eM16x2 thread engages standard CAT40 drawbar systems\u003c\/li\u003e\n\u003cli\u003e45-degree angle radius for reliable seating and pullout resistance\u003c\/li\u003e\n\u003cli\u003eThrough-coolant design supports internal coolant delivery\u003c\/li\u003e\n\u003cli\u003eKnob diameter of 0.74 inches with 0.492-inch neck diameter\u003c\/li\u003e\n\u003cli\u003eCompact 1.65-inch overall length fits standard toolholder retention geometry\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned as a direct-fit retention knob for CAT40 toolholders with M16x2 drawbar thread. Consult toolholder manufacturer documentation to confirm thread engagement and seating requirements before installation.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eRetention knobs are installed and removed by machinists or toolroom personnel using a retention knob wrench sized for the knob diameter. The spindle must be powered down and the machine placed in an e-stop or lockout-tagout state before servicing toolholders. Apply thread locking compound or torque to the toolholder manufacturer's specification — do not over-torque, as this can distort the toolholder taper. Inspect threads on both the knob and the toolholder bore 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: CAT40\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Size\u003c\/strong\u003e: M16x2\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAngle Radius\u003c\/strong\u003e: 45 degrees\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: 0.492 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eKnob to Flange Length\u003c\/strong\u003e: 0.642 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOverall Length\u003c\/strong\u003e: 1.65 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThrough Coolant\u003c\/strong\u003e: Yes\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePackage Dimensions\u003c\/strong\u003e: 3.15 inches L x 2.36 inches W x 2.36 inches H\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.22 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUNSPSC Code\u003c\/strong\u003e: 27112800\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eStandard Information\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand\u003c\/strong\u003e: SECO\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: 03119965\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"SECO TOOLS","offers":[{"title":"Default Title","offer_id":51557697323314,"sku":"03119965","price":71.08,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/29d7a0bf7361cd4ee750c242bca5874f.jpg?v=1786393043","url":"https:\/\/voomisupply.com\/products\/seco-03119965-cat40-retention-knob-45-degree-m16x2-through-coolant","provider":"Voomi Supply","version":"1.0","type":"link"}