Seco TDAB06T004S25-LF CBN200 Triangle CBN Turning Insert (4 Pcs)
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This listing is for a factory-new pack of 4 Seco Tools TDAB06T004S25-LF CBN200 cubic boron nitride turning inserts (Seco EDP 44271, internal ref. 160295121). Decoding the ISO-style designation: T = triangular shape (60° included angle); D = 15° clearance angle; A = ±0.005 in / ±0.13 mm tolerance class; B = with hole, no chipbreaker (solid top); 06 = 6.35 mm (1/4 in) inscribed circle; T004 = thickness 4.76 mm (3/16 in); S25 = 0.4 mm nose radius (metric series); LF = left-hand cutting edge geometry. The CBN200 grade is Seco's polycrystalline cubic boron nitride grade engineered for continuous and light interrupted hard turning of hardened steels (HRC 45–65), cast iron, and powder-metallurgy components, delivering superior hot hardness and wear resistance over carbide grades. The dark surface visible in the photos is consistent with the CBN tip brazed or sintered onto a carbide substrate, and the blue foam tray packaging confirms an unused, factory condition. Compatible toolholders follow the ISO/ANSI triangular insert pocket style accepting TDAB-geometry inserts (e.g., Seco STFCR/L and similar TCMM/TCMT-style holders with appropriate pocket dimensions).
Product Specifications
| Brand | Seco Tools |
| MPN | TDAB06T004S25-LF |
| Seco EDP # | 44271 |
| Grade | CBN200 |
| Insert Material | Cubic Boron Nitride (CBN) |
| Insert Shape | T - Triangular, 60° included angle |
| Clearance Angle | D - 15° |
| Tolerance Class | A - ±0.005 in / ±0.13 mm |
| Chipbreaker / Top Form | B - Hole, no chipbreaker (flat top) |
| Inscribed Circle (IC) | 6.35 mm (1/4 in) |
| Insert Thickness | 4.76 mm (3/16 in) |
| Nose Radius | 0.4 mm (S25 metric series) |
| Hand of Cut | LF - Left-hand |
| Quantity | 4 pcs |
| Condition | New |
| Application | Hard turning: hardened steels HRC 45–65, cast iron |
| Substrate | CBN tip on carbide substrate |