{"product_id":"hertel-h59874503-boring-insert-tpcg221-solid-carbide","title":"Hertel H59874503 Boring Insert TPCG221 Solid Carbide","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe HERTEL H59874503 is a solid carbide boring insert in the TPCG221 configuration, designed for precision internal boring operations on CNC and manual lathes. Uncoated and bright-finished, this insert carries the HT540B manufacturer grade with a C1 carbide material grade, making it well-suited for cast iron and non-ferrous materials where a sharp, uncoated edge outperforms coated alternatives. The 60-degree included angle forms a triangle shape, the inscribed circle measures 0.25 inches, and the corner radius is 0.0150 inches (1\/64 inches). The insert thickness is 0.0960 inches (3\/32 inches). It is screw-held and left-hand oriented with an 11-degree relief angle for clearance in tight bore geometries. Machinists and toolroom professionals install this insert as a direct-fit component in compatible TPCG-style boring holders.\u003c\/p\u003e\n\u003cp\u003eThis insert is intended for use in industrial boring applications including finish and semi-finish boring of bores requiring close tolerances and smooth surface finishes. The TPCG221 form factor fits standard TPCG screw-on boring bar and cartridge holders. The left-hand designation indicates the insert is configured for left-hand cutting direction, which is a critical selection criterion when specifying tooling for a given spindle direction or boring head setup. The uncoated solid carbide construction performs well in dry or lightly lubricated cutting conditions on softer ferrous and non-ferrous workpiece materials.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eSolid carbide construction, C1 material grade, bright\/uncoated finish for sharp-edge performance\u003c\/li\u003e\n  \u003cli\u003eTPCG221 insert style with 60-degree triangle shape and 11-degree relief angle\u003c\/li\u003e\n  \u003cli\u003eLeft-hand cutting orientation — confirm holder compatibility before ordering\u003c\/li\u003e\n  \u003cli\u003eScrew-held insert mounting method for secure, repeatable indexing\u003c\/li\u003e\n  \u003cli\u003eCorner radius of 0.0150 inches (1\/64 inches) for controlled surface finish in bore finishing passes\u003c\/li\u003e\n  \u003cli\u003eInscribed circle of 0.25 inches and thickness of 0.0960 inches (3\/32 inches)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned as a direct replacement-style boring insert for TPCG-style screw-on boring bars and cartridge holders accepting TPCG221 inserts. Always verify holder insert-pocket specifications against insert dimensions before installation.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eInstallation is performed by machinists or toolroom technicians using the appropriate torque driver or hex key for the insert clamping screw. Ensure the machine spindle is fully stopped and the machine is in a safe, locked-out state before changing inserts. Confirm the insert hand (left-hand) matches the cutting direction of the boring bar and spindle rotation. Inspect the insert pocket and seating surface for chips or debris before seating the insert, as contamination can affect insert positioning and surface finish quality.\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: 221\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer Grade\u003c\/strong\u003e: HT540B\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\u003eShape\u003c\/strong\u003e: Triangle (60-degree included angle)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInscribed Circle\u003c\/strong\u003e: 0.2500 inches (1\/4 inches)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCorner Radius\u003c\/strong\u003e: 0.0150 inches (1\/64 inches)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThickness\u003c\/strong\u003e: 0.0960 inches (3\/32 inches)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eRelief Angle\u003c\/strong\u003e: 11 degrees\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\/Finish\u003c\/strong\u003e: Bright\/Uncoated\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePackage Quantity\u003c\/strong\u003e: 1\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMinimum Order Quantity\u003c\/strong\u003e: 10\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: H59874503\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"HERTEL","offers":[{"title":"Default Title","offer_id":51739159789874,"sku":"H59874503","price":357.69,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/614f6f067d16a612c9582b14a3070b22.jpg?v=1788810532","url":"https:\/\/voomisupply.com\/products\/hertel-h59874503-boring-insert-tpcg221-solid-carbide","provider":"Voomi Supply","version":"1.0","type":"link"}