{"product_id":"hertel-h59874735-boring-insert-tpch221-solid-carbide-tin","title":"Hertel H59874735 Boring Insert TPCH221 Solid Carbide Tin","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe HERTEL H59874735 is a solid carbide boring insert designed for precision internal turning and boring operations on CNC and manual lathes. It carries the TPCH221 insert style designation and is manufactured to the HP520B grade, a PVD-applied titanium nitride (TiN) coated carbide classified at material grade C5. The triangular 60-degree included-angle geometry provides three usable cutting edges. With a 1\/4-inch inscribed circle, a thickness of 0.0960 inches, and a 1\/64-inch corner radius, this insert is sized for fine-bore and finish-bore work. A licensed machinist or toolroom technician is the typical end user.\u003c\/p\u003e\n\u003cp\u003eThis insert suits finish boring and light roughing in steel, cast iron, and similar materials where a C5-grade TiN-coated carbide performs reliably. The TPCH style uses a screw-clamping holding method, making it compatible with TPCH-designated boring bar pockets and modular boring head systems. It is appropriate for small-diameter bore applications in job-shop, production, and maintenance machining environments. The 11-degree relief angle reduces rubbing and supports consistent surface finish in close-tolerance bores.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eSolid carbide construction at material grade C5 for wear resistance in steel and cast iron\u003c\/li\u003e\n  \u003cli\u003ePVD-applied TiN coating extends tool life and reduces built-up edge\u003c\/li\u003e\n  \u003cli\u003e60-degree triangle shape with 11-degree relief angle for reduced cutting forces in boring operations\u003c\/li\u003e\n  \u003cli\u003e1\/64-inch corner radius suited to fine-finish boring with minimal nose chatter\u003c\/li\u003e\n  \u003cli\u003eScrew-clamp insert holding method for secure, repeatable seating in TPCH boring bars\u003c\/li\u003e\n  \u003cli\u003eCompact geometry with 1\/4-inch inscribed circle for small-diameter internal work\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned for use in TPCH-style boring bars and boring heads that accept a 221 insert size with screw-clamp retention. Verify pocket geometry, insert size code, and relief angle match before installation.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eInsert installation and indexing should be performed by a qualified machinist or toolroom technician. Power down and lock out the machine spindle before seating or indexing the insert. Use the manufacturer-recommended torx or hex key to tighten the clamp screw; do not overtighten, as solid carbide inserts are brittle and can crack under excessive clamping force. Inspect the insert pocket and clamp for chips or debris before seating a fresh edge.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInsert Style\u003c\/strong\u003e: TPCH\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\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eIncluded Angle\u003c\/strong\u003e: 60 degrees\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eRelief Angle\u003c\/strong\u003e: 11 degrees\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: C5\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer Grade\u003c\/strong\u003e: HP520B\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCoating\/Finish\u003c\/strong\u003e: TiN\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCoating Process\u003c\/strong\u003e: PVD\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInscribed Circle\u003c\/strong\u003e: 1\/4 inch (0.2500 inches)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThickness\u003c\/strong\u003e: 3\/32 inch (0.0960 inches)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCorner Radius\u003c\/strong\u003e: 1\/64 inch (0.0150 inches)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInsert Holding Method\u003c\/strong\u003e: Screw\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  \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: H59874735\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"HERTEL","offers":[{"title":"Default Title","offer_id":51742176837938,"sku":"H59874735","price":296.04,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/77acebe5f843432b5e907966db01ea80.jpg?v=1788835789","url":"https:\/\/voomisupply.com\/products\/hertel-h59874735-boring-insert-tpch221-solid-carbide-tin","provider":"Voomi Supply","version":"1.0","type":"link"}