{"product_id":"micro-100-qth-85-boring-grooving-bar-holder","title":"Micro 100 QTH-85 Boring Grooving Bar Holder","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe MICRO 100 QTH-85 is a boring and grooving bar holder designed for use with quick-change tooling systems in CNC and manual lathe applications. Built to QTH series standards, this holder accepts boring and grooving bars with a 0.1875-inch inside diameter and features a 0.5000-inch outside diameter shank. The overall length is 2.8000 inches, and the head diameter measures 0.7500 inches. A coolant-through design supports directed coolant delivery to the cutting zone, helping manage heat and chip evacuation during internal boring and grooving operations. This holder is installed by machinists and toolroom professionals in precision machining environments.\u003c\/p\u003e\u003cp\u003eThe QTH-85 is suited for internal boring and grooving operations on lathes equipped with quick-change toolpost systems. It is appropriate for both production and job-shop environments where consistent tool positioning and repeatability are required. The coolant-through capability makes it a practical choice for applications involving harder materials or deeper bores where heat management is critical to tool life and surface finish.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eInside diameter of 0.1875 inches for compatible boring and grooving bars\u003c\/li\u003e\n\u003cli\u003eOutside diameter of 0.5000 inches for standard quick-change toolpost fitment\u003c\/li\u003e\n\u003cli\u003eOverall length of 2.8000 inches for reach and clearance in typical lathe setups\u003c\/li\u003e\n\u003cli\u003eHead diameter of 0.7500 inches\u003c\/li\u003e\n\u003cli\u003eCoolant-through design for directed cutting fluid delivery to the cutting zone\u003c\/li\u003e\n\u003cli\u003ePart of the QTH series for consistent fitment within the MICRO 100 quick-change tooling system\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned for use within the MICRO 100 QTH series quick-change tooling system, compatible with boring and grooving bars requiring a 0.1875-inch bore and a 0.5000-inch shank interface.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eInstallation is performed by a qualified machinist following the lathe or toolpost manufacturer's setup procedures. Ensure the machine spindle is fully stopped and the lathe is powered down before changing or adjusting toolholders. Verify that the bar is seated fully and the clamping mechanism is engaged per the toolpost system specifications before resuming cuts. Coolant-through connections should be checked for proper seating and flow before operation.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eInside Diameter\u003c\/strong\u003e: 0.1875 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutside Diameter\u003c\/strong\u003e: 0.5000 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOverall Length\u003c\/strong\u003e: 2.8000 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHead Diameter\u003c\/strong\u003e: 0.7500 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCoolant Through\u003c\/strong\u003e: Yes\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeries\u003c\/strong\u003e: QTH\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.19 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: MICRO 100\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: QTH-85\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"MICRO 100","offers":[{"title":"Default Title","offer_id":52079700705586,"sku":"QTH-85","price":195.71,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/72a644b5a58149d39b3bba3a0103b1b7_553540a0-c4d6-4f5f-ba9b-cbe9e529d618.jpg?v=1790055012","url":"https:\/\/voomisupply.com\/products\/micro-100-qth-85-boring-grooving-bar-holder","provider":"Voomi Supply","version":"1.0","type":"link"}