{"product_id":"scientific-cutting-tools-qhc75-3-8-boring-grooving-bar-holder","title":"Scientific Cutting Tools QHC75-3\/8 Boring Grooving Bar Holder","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe SCIENTIFIC CUTTING TOOLS QHC75-3\/8 is a boring and grooving bar holder designed for use with modular boring bar systems in precision machining applications. The holder accepts a 3\/8 inch inner diameter boring bar and features a 3\/4 inch outer diameter body with an overall length of 3.25 inches and a head diameter of 0.87 inches. A 3\/8-18 NPT through-coolant port delivers cutting fluid directly to the cutting zone, supporting tool life and chip evacuation during internal grooving and boring operations. Four lock-down screws secure the bar firmly in position.\u003c\/p\u003e\u003cp\u003eThis bar holder is intended for use on CNC lathes, turning centers, and manual lathes equipped with compatible modular tooling systems. It suits production and job-shop environments where internal grooving, boring, or profiling operations require a rigid, coolant-fed tool interface. The Series QHC designation identifies it within a family of quick-change holders designed for repeatable setup in high-volume or precision turning work. Machinists and toolroom technicians are the primary installers of this style of toolholder.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e3\/8 inch ID bore accepts standard 3\/8 inch boring and grooving bars\u003c\/li\u003e\n\u003cli\u003e3\/4 inch OD body for compact, rigid bar support\u003c\/li\u003e\n\u003cli\u003e3\/8-18 NPT through-coolant port for directed coolant delivery\u003c\/li\u003e\n\u003cli\u003eFour lock-down screws provide secure, chatter-resistant bar clamping\u003c\/li\u003e\n\u003cli\u003e3.25 inch overall length suits typical turning center tool stations\u003c\/li\u003e\n\u003cli\u003e0.87 inch head diameter for close-clearance internal work\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned as an OEM-style replacement or direct addition for modular boring and grooving bar tooling systems accepting 3\/8 inch diameter boring bars in the Series QHC holder family.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eInstallation is performed by qualified machinists or toolroom technicians. Ensure the machine spindle is fully stopped and the tool turret or holder block is de-energized before inserting or removing the bar holder. Tighten all four lock-down screws evenly to the toolholder manufacturer's recommended procedure to prevent bar deflection or pullout during cutting. Verify the through-coolant port connection is leak-free before commencing the machining cycle.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eInner Diameter (ID)\u003c\/strong\u003e: 3\/8 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOuter Diameter (OD)\u003c\/strong\u003e: 3\/4 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: 0.0625 pounds\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: QHC75-3\/8\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"SCIENTIFIC CUTTING TOOLS","offers":[{"title":"Default Title","offer_id":52073965322546,"sku":"QHC75-3\/8","price":70.34,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/23f553db3fc19141f0856ef0825f6e81.jpg?v=1790050885","url":"https:\/\/voomisupply.com\/products\/scientific-cutting-tools-qhc75-3-8-boring-grooving-bar-holder","provider":"Voomi Supply","version":"1.0","type":"link"}