{"product_id":"carmex-sir1250s27-indexable-threading-toolholder","title":"Carmex SIR1250S27 Indexable Threading Toolholder","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe CARMEX SIR1250S27 is an indexable threading toolholder designed for internal threading operations on CNC lathes and turning centers. Built to SIR series standards, it features a 1.25 x 1.25 inch square shank and accepts 27IR inserts secured by a screw-clamp holding method. The toolholder is machined from steel and spans 10 inches in overall length, with a minimum bore diameter of 1.56 inches. It is intended for right-hand cutting and is configured without coolant-through capability. Machinists and toolroom technicians working in production or job-shop environments rely on this style of toolholder for consistent thread-form repeatability with indexable inserts.\u003c\/p\u003e\u003cp\u003eThis toolholder is suited for internal threading applications in ferrous and non-ferrous workpieces where bore access requires a rigid, close-tolerance bar. The SIR series toolholder style is commonly used on manual and CNC lathes in production threading operations. With a minimum bore diameter of 1.56 inches, it is appropriate for medium-to-large bore threading work. The back-of-bar to cutting edge dimension is 0.88 inches, and the center-to-cutting-edge dimension is also 0.88 inches, supporting accurate tool offset setup.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eInternal, right-hand threading toolholder in the SIR series\u003c\/li\u003e\n\u003cli\u003eAccepts 27IR indexable inserts with screw-clamp holding method\u003c\/li\u003e\n\u003cli\u003e1.25 x 1.25 inch square steel shank for rigid setup\u003c\/li\u003e\n\u003cli\u003e10 inch overall length with 1.56 inch minimum bore diameter\u003c\/li\u003e\n\u003cli\u003e5\/8 inch insert inscribed circle for thread-form stability\u003c\/li\u003e\n\u003cli\u003eConfigured without coolant-through for simplified setup\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned for use with 27IR series indexable threading inserts. Verify insert geometry and thread standard against job requirements before installation.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eThis toolholder should be installed by a qualified machinist familiar with lathe tooling setup and indexable insert systems. Power down and lock out the machine before changing inserts or adjusting the toolholder position. Ensure the shank is properly seated and clamped in the turret or tool block to the machine manufacturer's specified torque range. Handle indexable inserts with care  -  edges are sharp and brittle.\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\u003eSeries\u003c\/strong\u003e: SIR\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStyle\u003c\/strong\u003e: SIR 1250 S27\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eToolholder Style Code\u003c\/strong\u003e: SI\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInsert Compatibility\u003c\/strong\u003e: 27IR\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInsert Inscribed Circle\u003c\/strong\u003e: 5\/8 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: 1.25 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShank Height\u003c\/strong\u003e: 1.25 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOverall Length\u003c\/strong\u003e: 10 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMinimum Bore Diameter\u003c\/strong\u003e: 1.56 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNeck Diameter\u003c\/strong\u003e: 1.25 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBack of Bar to Cutting Edge\u003c\/strong\u003e: 0.88 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCenter to Cutting Edge\u003c\/strong\u003e: 0.88 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDistance Across Flats\u003c\/strong\u003e: 1.122 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eToolholder Material\u003c\/strong\u003e: Steel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCoolant Through\u003c\/strong\u003e: No\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCoolant Entry Style\u003c\/strong\u003e: Without Coolant\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMulti-use Tool\u003c\/strong\u003e: No\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCutting Tool Application\u003c\/strong\u003e: Threading\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: SIR1250S27\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"CARMEX","offers":[{"title":"Default Title","offer_id":52041104752946,"sku":"SIR1250S27","price":284.02,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/519a6df51f94866c395798031e080cda.jpg?v=1790027515","url":"https:\/\/voomisupply.com\/products\/carmex-sir1250s27-indexable-threading-toolholder","provider":"Voomi Supply","version":"1.0","type":"link"}