{"product_id":"hertel-h59874131-boring-insert-tpcb221-solid-carbide","title":"Hertel H59874131 Boring Insert TPCB221 Solid Carbide","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe HERTEL H59874131 is a solid carbide boring insert designed for precision internal turning and boring operations on CNC and manual lathes. Manufactured to TPCB221 insert geometry, it features a 60-degree triangular shape with an 11-degree relief angle and an uncoated finish suited for general-purpose machining in C1 grade carbide. The inscribed circle measures 0.25 inches, thickness is 0.096 inches, and the corner radius is 0.015 inches (1\/64 inch). Grade HT540B identifies the specific carbide formulation and geometry class. The insert is held in place by a screw-type clamping system, making it compatible with standard TPCB-style boring bars and toolholders.\u003c\/p\u003e\n\u003cp\u003eThis insert is used in boring and internal turning applications across metalworking, machining, and tool-and-die trades. It is appropriate for residential shop, job shop, and production floor environments where close-tolerance internal diameters are required. The uncoated solid carbide construction makes it a practical choice for cast iron, non-ferrous metals, and similar materials where coating adhesion or heat buildup is a concern. Machinists and tool technicians select this insert when tight corner radius control and consistent edge geometry are priorities.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eTPCB221 insert style with 60-degree triangular geometry and 11-degree relief angle\u003c\/li\u003e\n  \u003cli\u003eSolid carbide construction, grade C1, manufacturer grade HT540B\u003c\/li\u003e\n  \u003cli\u003eUncoated finish for general-purpose boring and internal turning\u003c\/li\u003e\n  \u003cli\u003eCorner radius of 0.015 inches for controlled surface finish\u003c\/li\u003e\n  \u003cli\u003eScrew-type insert holding method for secure, repeatable seating\u003c\/li\u003e\n  \u003cli\u003eInscribed circle of 0.25 inches and thickness of 0.096 inches\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned as a direct-fit replacement insert for TPCB-style boring bars and toolholders accepting 221 size code inserts with screw-type clamping.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eThis insert is installed and replaced by machinists or tool technicians using appropriate insert clamping screws and a torx or hex key as specified by the toolholder manufacturer. Power down and lock out the machine spindle before changing inserts. Inspect the insert pocket and clamping screw for wear or damage before seating a new insert. Do not overtighten the clamping screw beyond the toolholder manufacturer specification.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInsert Style\u003c\/strong\u003e: TPCB\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInsert Size Code\u003c\/strong\u003e: 221\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eShape\u003c\/strong\u003e: Triangle, 60-degree included angle\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInsert Material\u003c\/strong\u003e: Solid Carbide\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial Grade\u003c\/strong\u003e: C1\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer Grade\u003c\/strong\u003e: HT540B\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCoating\/Finish\u003c\/strong\u003e: Uncoated\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInscribed Circle\u003c\/strong\u003e: 0.25 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThickness\u003c\/strong\u003e: 0.096 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCorner Radius\u003c\/strong\u003e: 0.015 inches (1\/64 inch)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eRelief Angle\u003c\/strong\u003e: 11 degrees\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInsert Holding Method\u003c\/strong\u003e: Screw\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.03 pounds\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: HERTEL\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: H59874131\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"HERTEL","offers":[{"title":"Default Title","offer_id":51728501145906,"sku":"H59874131","price":265.51,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/74bc6fa5906292e62d3ec4e7b128fdda.jpg?v=1788692236","url":"https:\/\/voomisupply.com\/products\/hertel-h59874131-boring-insert-tpcb221-solid-carbide","provider":"Voomi Supply","version":"1.0","type":"link"}