{"product_id":"scientific-cutting-tools-qhc75-1-4-boring-grooving-bar-holder","title":"Scientific Cutting Tools QHC75-1\/4 Boring Grooving Bar Holder","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe SCIENTIFIC CUTTING TOOLS QHC75-1\/4 is a boring and grooving bar holder designed for use in CNC turning and boring applications. It features a 0.25 inch inner diameter and a 0.75 inch outer diameter, with an overall length of 3.25 inches and a head diameter of 0.87 inches. The holder is equipped with through-coolant capability via a 3\/8-18 NPT coolant port, allowing direct coolant delivery to the cutting zone for improved chip evacuation and tool life. Four lock-down screws secure the boring or grooving bar firmly in place during operation. This holder is installed and used by machinists and CNC lathe operators working in precision machining environments.\u003c\/p\u003e\u003cp\u003eThis bar holder is suited for small-diameter boring and grooving operations on CNC lathes and turning centers. It is part of the Series QHC line, intended for applications requiring compact toolholding with through-coolant support. Typical use cases include internal diameter finishing, grooving, and threading operations where rigidity and coolant delivery at the cutting edge are critical to achieving tight tolerances.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e0.25 inch ID and 0.75 inch OD for small-bore toolholding applications\u003c\/li\u003e\n\u003cli\u003e3.25 inch overall length with 0.87 inch head diameter\u003c\/li\u003e\n\u003cli\u003eThrough-coolant design with 3\/8-18 NPT coolant port for direct chip and heat management\u003c\/li\u003e\n\u003cli\u003eFour lock-down screws for positive, rigid bar retention\u003c\/li\u003e\n\u003cli\u003ePart of the Series QHC boring and grooving bar holder line\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned as an OEM-style holder within the SCIENTIFIC CUTTING TOOLS Series QHC line, compatible with boring and grooving bars sized to a 0.25 inch shank diameter.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eInstallation should be performed by a qualified machinist following the machine tool manufacturer guidelines. Ensure the machine spindle is fully stopped and the machine is in a safe, powered-down state before mounting or adjusting the holder. Torque all four lock-down screws evenly to secure the boring bar without inducing runout. Verify coolant line connection at the 3\/8-18 NPT port is sealed before resuming coolant flow.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eInner Diameter\u003c\/strong\u003e: 0.25 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOuter Diameter\u003c\/strong\u003e: 0.75 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOverall Length (OAL)\u003c\/strong\u003e: 3.25 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHead Diameter\u003c\/strong\u003e: 0.87 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCoolant Port Thread\u003c\/strong\u003e: 3\/8-18 NPT\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCoolant Type\u003c\/strong\u003e: Through Coolant\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNumber of Lock Down Screws\u003c\/strong\u003e: 4\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeries\u003c\/strong\u003e: QHC\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 1 pound\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eStandard Information\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand\u003c\/strong\u003e: SCIENTIFIC CUTTING TOOLS\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: QHC75-1\/4\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"SCIENTIFIC CUTTING TOOLS","offers":[{"title":"Default Title","offer_id":51972400742706,"sku":"QHC75-1\/4","price":70.12,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/8c04e0aadce2a2a3d6e749ba14e541b4.jpg?v=1789967618","url":"https:\/\/voomisupply.com\/products\/scientific-cutting-tools-qhc75-1-4-boring-grooving-bar-holder","provider":"Voomi Supply","version":"1.0","type":"link"}