{"product_id":"carmex-sir0375h11-internal-threading-toolholder-3-8-in","title":"Carmex SIR0375H11 Internal Threading Toolholder 3\/8 in","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe CARMEX SIR0375H11 is an indexable internal threading toolholder designed for right-hand cutting operations on CNC lathes and turning centers. Built to the SI toolholder style, it accepts 11IR indexable threading inserts secured by a screw-clamp holding method. The shank measures 3\/8 x 3\/8 inches with an overall length of 4 inches. The minimum bore diameter and maximum depth of cut are both 0.47 inches, making this holder suited to small-bore internal threading work. Machinists and CNC operators working in production threading applications will find this holder a direct-fit solution for precision thread forms in bored features.\u003c\/p\u003e\u003cp\u003eThis toolholder is intended for internal threading on metalworking lathes and turning centers where small-bore access is required. The 3\/8-inch square shank fits standard tool blocks and quick-change toolpost systems sized for that shank. The back-of-bar to cutting edge dimension is 0.28 inches, and the center-to-cutting-edge offset is also 0.28 inches, allowing predictable tool positioning during setup. It is used in job shops, production turning operations, and maintenance machining environments where repeatable thread quality is required.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eSI-style right-hand internal threading toolholder accepts 11IR indexable inserts\u003c\/li\u003e\n\u003cli\u003eScrew-clamp insert holding method for secure, repeatable insert indexing\u003c\/li\u003e\n\u003cli\u003e3\/8 x 3\/8 inch square shank fits standard small-bore toolpost systems\u003c\/li\u003e\n\u003cli\u003eMinimum bore diameter of 0.47 inches suitable for small internal threading operations\u003c\/li\u003e\n\u003cli\u003e4-inch overall length provides reach into standard workpiece bores\u003c\/li\u003e\n\u003cli\u003eNo coolant-through design  -  external coolant application applies\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned to accept 11IR series indexable threading inserts with a 1\/4-inch inscribed circle. Compatible with tool blocks and quick-change systems sized for a 3\/8-inch square shank.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eInstallation is performed by qualified machinists or CNC setup technicians. Ensure the machine spindle is fully stopped and the machine is placed in an appropriate lockout state before changing or indexing inserts. Secure the toolholder in the tool block to the machine manufacturer's specified clamping torque using the correct wrench  -  do not over-torque the insert screw beyond the insert manufacturer's recommendation. Verify tool centerline height at setup to maintain thread form accuracy.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Type\u003c\/strong\u003e: Internal\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHand of Holder\u003c\/strong\u003e: Right Hand\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eToolholder Style\u003c\/strong\u003e: SI\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeries\u003c\/strong\u003e: SIR\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStyle Code\u003c\/strong\u003e: SIR 0375 H11\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInsert Compatibility\u003c\/strong\u003e: 11IR\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInsert Inscribed Circle\u003c\/strong\u003e: 1\/4 inch\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInsert Holding Method\u003c\/strong\u003e: Screw\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShank Width\/Diameter\u003c\/strong\u003e: 0.375 inches (3\/8 inch)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShank Height\u003c\/strong\u003e: 0.375 inches (3\/8 inch)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOverall Length\u003c\/strong\u003e: 4 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMinimum Bore Diameter\u003c\/strong\u003e: 0.47 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaximum Depth of Cut\u003c\/strong\u003e: 0.47 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNeck Diameter\u003c\/strong\u003e: 0.38 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBack of Bar to Cutting Edge\u003c\/strong\u003e: 0.28 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCenter to Cutting Edge\u003c\/strong\u003e: 0.28 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCoolant Through\u003c\/strong\u003e: No\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCutting Tool Application\u003c\/strong\u003e: Threading\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUNSPSC Code\u003c\/strong\u003e: 23291800\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eStandard Information\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand\u003c\/strong\u003e: CARMEX\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: SIR0375H11\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"CARMEX","offers":[{"title":"Default Title","offer_id":52045605699890,"sku":"SIR0375H11","price":175.45,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/5ee468576bb42c6257fd2fe69586ff7f.jpg?v=1790030617","url":"https:\/\/voomisupply.com\/products\/carmex-sir0375h11-internal-threading-toolholder-3-8-in","provider":"Voomi Supply","version":"1.0","type":"link"}