{"product_id":"global-cnc-industries-8612b-312-tool-holder-bushing-type-b","title":"Global Cnc Industries 8612B .312 Tool Holder Bushing Type B","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe GLOBAL CNC INDUSTRIES 8612B .312 is a Type B rotary tool holder bushing designed for use in drill press, milling, and CNC machining setups where precise bore location and tool guidance are required. It features a 0.3125-inch inside diameter and a 1.2500-inch outside diameter, with a head thickness of 0.265 inches. The 2.125-inch length under the head provides substantial engagement depth for stable tool support. This bushing is installed by machinists and toolroom technicians as a replaceable liner in jig plates and tool holder bodies to maintain accurate, repeatable positioning of rotating tooling.\u003c\/p\u003e\n\u003cp\u003eType B bushings are commonly used in production jig and fixture applications where a fixed-type liner is needed without a locking collar. This part fits standard jig plate bores sized for 1.250-inch OD bushings and is suited for light-to-medium duty drilling, reaming, and boring operations in both manual and CNC-assisted machining environments. It is appropriate for job shop and production floor use where consistent hole location tolerances must be maintained across repeated operations.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eType B fixed-liner bushing for jig plate and tool holder applications\u003c\/li\u003e\n  \u003cli\u003eInside diameter of 0.3125 inches (5\/16 inch) for compatible drill and reamer shanks\u003c\/li\u003e\n  \u003cli\u003eOutside diameter of 1.2500 inches (1-1\/4 inch) for standard jig plate bore fitment\u003c\/li\u003e\n  \u003cli\u003eHead thickness of 0.265 inches provides a positive stop and prevents axial migration\u003c\/li\u003e\n  \u003cli\u003eLength under head of 2.125 inches (2-1\/8 inch) for deep engagement and tool guidance stability\u003c\/li\u003e\n  \u003cli\u003eMinimum order quantity of 1 unit  -  suitable for single-piece replacement or toolroom stocking\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned as an OEM-style replacement or new-installation bushing for jig plates and tool holder bodies requiring a Type B fixed liner with a 1.2500-inch outside diameter bore and a 0.3125-inch inside diameter.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eInstallation is performed by qualified machinists or toolroom personnel. Press-fit the bushing into the jig plate bore using an arbor press, ensuring the bore and bushing OD are clean and free of burrs before pressing. Do not use impact tools to drive the bushing, as this can damage the bore geometry or distort the bushing. Verify inside diameter clearance with the intended tool shank before placing the jig plate into service.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBushing Type\u003c\/strong\u003e: B\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInside Diameter\u003c\/strong\u003e: 0.3125 inches (5\/16 inch)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOutside Diameter\u003c\/strong\u003e: 1.2500 inches (1-1\/4 inch)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLength Under Head\u003c\/strong\u003e: 2.1250 inches (2-1\/8 inch)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHead Thickness\u003c\/strong\u003e: 0.265 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 1 pound\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePackage Quantity\u003c\/strong\u003e: 1\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eStandard Information\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBrand\u003c\/strong\u003e: GLOBAL CNC INDUSTRIES\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: 8612B .312\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"GLOBAL CNC INDUSTRIES","offers":[{"title":"Default Title","offer_id":67907771662642,"sku":"8612B .312","price":107.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/2a01f10398bccc19b91b5728bf3eb53e.jpg?v=1791181353","url":"https:\/\/voomisupply.com\/products\/global-cnc-industries-8612b-312-tool-holder-bushing-type-b","provider":"Voomi Supply","version":"1.0","type":"link"}