{"product_id":"high-hardness-carbide-end-mill-bk2063-bb2063","title":"High Hardness Carbide End Mill | BK2063 \u0026 BB2063 | Hardened Steel","description":"\u003ch2\u003eHigh-Hardness End Mills | BK2063 \u0026amp; BB2063\u003c\/h2\u003e\n\u003cp\u003eTwo high-hardness solid carbide flat end mill series engineered for hardened steel and die \u0026amp; mold machining — \u003cstrong\u003eBB2063 with TiSiN composite coating\u003c\/strong\u003e and \u003cstrong\u003eBK2063 with unique diamond coating\u003c\/strong\u003e. Same 0.2μm ultra-fine grain carbide substrate, two coatings tuned for different workpiece hardness.\u003c\/p\u003e\n\u003cdiv class=\"size-legend\" data-size-legend=\"1\" style=\"border-left:3px solid #888;padding:8px 12px;margin:14px 0;background:#f7f7f7\"\u003e\n\u003cp style=\"margin:0\"\u003e\u003cstrong\u003eReading the size options\u003c\/strong\u003e — Ø (cutting diameter) × shank Ø × flute length × overall length, all in mm. Example: 6×6×20×75 = 6 mm cutting diameter, 6 mm shank, 20 mm flute, 75 mm overall. The size chart in the image gallery shows the same four dimensions.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"substrate-spec\" data-substrate-note=\"BB2063\" style=\"border-left:3px solid #4a4a4a;padding:10px 14px;margin:16px 0;background:#fafafa\"\u003e\n\u003cp style=\"margin:0 0 6px\"\u003e\u003cstrong\u003eBB2063 substrate \u0026amp; coating\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul style=\"margin:0;padding-left:20px\"\u003e\n\u003cli\u003eGeometry: 35° helix\u003c\/li\u003e\n\u003cli\u003eGrain size: 0.3–0.2 μm\u003c\/li\u003e\n\u003cli\u003eRecommended hardness range: HRC 45–62\u003c\/li\u003e\n\u003cli\u003eCoating: upgraded TiSiN composite, hardness \u0026gt; HV 3500, better oxidation resistance and thermal stability than standard TiSiN\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"series-workpiece\" data-series-note=\"BK2063\" style=\"border-left:3px solid #c8102e;padding:10px 14px;margin:16px 0;background:#fafafa\"\u003e\n\u003cp style=\"margin:0 0 6px\"\u003e\u003cstrong\u003eRecommended workpiece materials — BK2063\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp style=\"margin:0\"\u003e\u003cstrong\u003eMold steel and hardened steel above HRC 45\u003c\/strong\u003e. Intended for hardened dies, inserts and heat-treated components, where chipping resistance at the cutting edge is the limiting factor.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003ch3\u003eMain Features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e0.2 μm ultra-fine grain carbide substrate\u003c\/strong\u003e — extremely high hardness and toughness, stable edge life in hardened steel up to HRC 62.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReinforced tool geometry\u003c\/strong\u003e — edge design optimized for high-hardness cutting, with strict whole-process quality control for consistent performance.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTwo next-generation coatings\u003c\/strong\u003e — TiSiN composite for hardened steels; unique diamond coating (HV 8000+) for extreme hardness and wear resistance.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e35° \/ 45° helix angle\u003c\/strong\u003e — BB2063 35° for smooth chip flow; BK2063 45° reinforced edge for high-hardness cutting.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eBB2063 — TiSiN Composite Coating\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e4-flute flat end mill, 31 sizes from 1 to 20 mm.\u003c\/li\u003e\n\u003cli\u003eTiSiN composite coating, microhardness \u0026gt; HV 3500, superior oxidation resistance and thermal stability for high-temperature cutting.\u003c\/li\u003e\n\u003cli\u003eBest for: hardened steels HRC 45–62, die steels (SKD11, P20, 718, H13, Cr12), welding parts and oxygen-cut materials.\u003c\/li\u003e\n\u003cli\u003eRigid core design reduces vibration and deflection — ideal for finish machining of mold cavities.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eBK2063 — Diamond Coating\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eAvailable in 4-flute flat (13 sizes) and 2-flute flat (13 sizes), 1–20 mm.\u003c\/li\u003e\n\u003cli\u003eUnique diamond coating technology, hardness up to HV 8000+ — ultra-low friction and excellent heat dissipation, keeps the edge sharp longer in high-hardness machining.\u003c\/li\u003e\n\u003cli\u003e45° helix, reinforced cutting edge for high-hardness steel.\u003c\/li\u003e\n\u003cli\u003eBest for: pre-hardened and hardened mold steels up to HRC 65, tool steels and abrasive hardened workpieces, fine finishing with light depth of cut.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eCutting Parameters (Reference)\u003c\/h3\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0858\/5343\/8263\/files\/566427692298b0e49eeea915fefb433a.png?v=1790513172\" alt=\"Cutting speeds and feeds reference BK2063 BB2063 hardened steel HRC45-65\" width=\"1200\" loading=\"lazy\"\u003e\u003c\/p\u003e\n\u003cp\u003eSpeeds and feeds by workpiece hardness (HRC 45–50 \/ 50–55 \/ 55–60 \/ 60–65) and cutter diameter. Adjust according to workpiece material and hardness. ap = 1\/3D (1\/8–1\/2D), ae = 1\/2D (1\/4–1D) as a starting point; air blow recommended.\u003c\/p\u003e\n\n\u003ch3\u003eSize Chart\u003c\/h3\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0858\/5343\/8263\/files\/617ae0ad4c3a4f56ae6a96feee1ad75a.png?v=1790513179\" alt=\"BK2063 BB2063 flat end mill size chart 2F 4F 1-20mm\" width=\"1200\" loading=\"lazy\"\u003e\u003c\/p\u003e\n\u003ch3\u003eApplicable Materials\u003c\/h3\u003e\n\u003cp\u003eHardened steels (HRC 45–62) · mold \u0026amp; die steels (P20, 718, H13, SKD11, Cr12) · welding parts · pre-hardened and hardened steels up to HRC 65 with BK2063.\u003c\/p\u003e\n\n\u003ch3\u003eQuality Control\u003c\/h3\u003e\n\u003cp\u003eFrom raw material to finished tool, every piece passes strict inspection for consistent, stable quality. 100 minutes of continuous cutting with minimal edge wear in hardened steel field tests.\u003c\/p\u003e\n\u003cdiv class=\"bb-reviews-banner\" data-bb=\"customer-reviews\" style=\"margin-top:32px;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0858\/5343\/8263\/files\/bb_reviews_end-mill_20261103.png?v=1793673619\" alt=\"BB Tool customer reviews\" style=\"width:100%;border-radius:8px;display:block;\" loading=\"lazy\"\u003e\u003c\/div\u003e","brand":"BB Tool","offers":[{"title":"1x4x3x50 \/ BK2063-4F","offer_id":52741014061367,"sku":"1x4x3x50-4F-BK2063","price":18.75,"currency_code":"USD","in_stock":true},{"title":"1x4x3x50 \/ BK2063-2F","offer_id":52741014094135,"sku":null,"price":18.75,"currency_code":"USD","in_stock":true},{"title":"1.5x4x4x50 \/ BK2063-4F","offer_id":52741014159671,"sku":"1.5x4x4x50-4F-BK2063","price":18.75,"currency_code":"USD","in_stock":true},{"title":"1.5x4x4x50 \/ BK2063-2F","offer_id":52741014192439,"sku":null,"price":18.75,"currency_code":"USD","in_stock":true},{"title":"2x4x5x50 \/ 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