{"product_id":"hertel-h59875567-boring-insert-tpcg321-hc620b-solid-carbide","title":"Hertel H59875567 Boring Insert TPCG321 HC620B Solid Carbide","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe HERTEL H59875567 is a solid carbide boring insert designed for precision metal-cutting operations on CNC and manual boring bars. Manufactured to TPCG321 geometry in grade HC620B, this insert features a 60-degree triangular shape with an 11-degree relief angle and a 1\/64-inch (0.0150-inch) corner radius. The multi-layer CVD coating stack  -  TiN, TiC, TiCN, TiN  -  delivers wear resistance and thermal stability suited to C7 material-grade applications including cast iron and nonferrous alloys. The screw-holding method and left-hand designation make it a direct-fit choice for compatible TPCG-style left-hand boring bar holders. Installation and replacement are performed by machinists and toolroom technicians in production and job-shop environments.\u003c\/p\u003e\n\u003cp\u003eThis insert is applied in internal boring operations on lathes, machining centers, and boring mills where tight tolerances and consistent surface finishes are required. The 3\/8-inch inscribed circle and 0.127-inch thickness conform to standard ANSI TPCG321 sizing, allowing use in any tool holder dimensioned for that insert class. Typical applications include finish and semi-finish boring of ferrous castings, aluminum components, and nonferrous workpieces where the C7 grade and CVD coating provide the right balance of hardness and edge retention. The catalog number for this insert is TPCG321L.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eSolid carbide substrate in manufacturer grade HC620B, material grade C7\u003c\/li\u003e\n  \u003cli\u003eMulti-layer CVD coating: TiN outer, TiC, TiCN, TiN sequence for extended tool life\u003c\/li\u003e\n  \u003cli\u003e60-degree triangular TPCG geometry with 11-degree relief angle\u003c\/li\u003e\n  \u003cli\u003e1\/64-inch (0.0150-inch) corner radius for controlled surface finish\u003c\/li\u003e\n  \u003cli\u003e3\/8-inch inscribed circle, 1\/8-inch (0.127-inch) thickness  -  ANSI TPCG321 standard sizing\u003c\/li\u003e\n  \u003cli\u003eLeft-hand designation with screw-holding method for secure, repeatable seating\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned as an OEM-style replacement insert for TPCG321L-style left-hand boring bar holders and tool blocks dimensioned for a 3\/8-inch inscribed circle triangular insert with screw clamping.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eInsert replacement should be performed by a qualified machinist with the machine powered down, spindle locked, and all motion axes secured. Use the appropriate Torx or hex key to remove and reinstall the clamping screw to the tool holder manufacturer's specified seating procedure  -  do not overtighten, as carbide inserts are brittle and can fracture under excessive clamp load. Verify insert seating is flush and square in the pocket before resuming cuts. Inspect the insert pocket and screw threads for wear or damage each time the insert is indexed or replaced.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInsert Style\u003c\/strong\u003e: TPCG\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInsert Size Code\u003c\/strong\u003e: 321\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer Grade\u003c\/strong\u003e: HC620B\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial Grade\u003c\/strong\u003e: C7\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInsert Material\u003c\/strong\u003e: Solid Carbide\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\u003eRelief Angle\u003c\/strong\u003e: 11 degrees\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInscribed Circle\u003c\/strong\u003e: 3\/8 inches (0.3750 inches)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCorner Radius\u003c\/strong\u003e: 1\/64 inches (0.0150 inches)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThickness\u003c\/strong\u003e: 1\/8 inches (0.1270 inches)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInsert Hand\u003c\/strong\u003e: Left Hand\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInsert Holding Method\u003c\/strong\u003e: Screw\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCoating Process\u003c\/strong\u003e: CVD\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCoating Finish\u003c\/strong\u003e: TiN, TiC, TiCN, TiN\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCatalog Number\u003c\/strong\u003e: TPCG321L\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePackage Dimensions\u003c\/strong\u003e: 4 inches L x 1.5 inches W x 0.25 inches H\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.03 pounds\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eItem Package Quantity\u003c\/strong\u003e: 1\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMinimum Order Quantity\u003c\/strong\u003e: 10\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: H59875567\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"HERTEL","offers":[{"title":"Default Title","offer_id":51740899803442,"sku":"H59875567","price":386.16,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/5f6da82bead309bdfe0e14f0d30a1c7f.jpg?v=1788828224","url":"https:\/\/voomisupply.com\/products\/hertel-h59875567-boring-insert-tpcg321-hc620b-solid-carbide","provider":"Voomi Supply","version":"1.0","type":"link"}