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All three series feature an \u003cstrong\u003eunequal helix angle design\u003c\/strong\u003e that actively dampens vibration, improves surface finish, and extends tool life.\u003c\/p\u003e\n\n\u003chr\u003e\n\n\u003ch3\u003e🔶 JIN Series (BB-JIN)\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eGeometry:\u003c\/strong\u003e 38° + 40° unequal helix angle (8° differential), asymmetric design\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCoating:\u003c\/strong\u003e TiZr (Titanium Zirconium) — excellent heat resistance and lubricity\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSubstrate:\u003c\/strong\u003e High hardness and high toughness carbide\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eApplications:\u003c\/strong\u003e Stainless steel, titanium alloy, heat-resisting alloy, superalloy, mild steel, brass, copper, non-ferrous metals\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial grades:\u003c\/strong\u003e A3, 45#, 40Cr, 20Cr, 304, 316L, TC4, TC6, 4J29\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMachining strategies:\u003c\/strong\u003e Side milling, dynamic milling, trochoidal machining, layer milling\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003chr\u003e\n\n\u003ch3\u003e🔷 BK40-SUS Series\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eGeometry:\u003c\/strong\u003e 38° primary helix + 41° secondary helix — optimized for vibration damping\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eRake angle:\u003c\/strong\u003e High positive radial rake for free-cutting action\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eClearance angle:\u003c\/strong\u003e Optimized for maximum tool life\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSubstrate:\u003c\/strong\u003e High hardness and high toughness carbide\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eApplications:\u003c\/strong\u003e Stainless steel, titanium alloy, heat-resisting alloy, superalloy, mild steel, brass, copper, non-ferrous metals\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial grades:\u003c\/strong\u003e A3, 45#, 304, 316L, TC4, TC6\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMachining strategies:\u003c\/strong\u003e Side milling, dynamic milling, trochoidal machining\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003chr\u003e\n\n\u003ch3\u003e⬛ BK40-UM Series (Ultra-Hard Materials)\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eGeometry:\u003c\/strong\u003e Unequal helix angle — vibration suppression for hard material cutting\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eApplications:\u003c\/strong\u003e Oxygen-cut parts, welded components, die steel, tool steel, heat-treated high-hardness stainless steel\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial grades:\u003c\/strong\u003e SKD11, 718H, P20, Cr12, 430, 630\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHardness range:\u003c\/strong\u003e HRC 50–63\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMachining strategies:\u003c\/strong\u003e Side milling, dynamic milling, trochoidal machining, layer milling\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003chr\u003e\n\n\u003ch3\u003e📋 Usage Recommendations\u003c\/h3\u003e\n\u003col\u003e\n  \u003cli\u003eBefore use, measure tool runout. If runout exceeds \u003cstrong\u003e0.01 mm\u003c\/strong\u003e, correct before cutting.\u003c\/li\u003e\n  \u003cli\u003eMinimize tool overhang from the chuck. 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