Seco SD25-04531-221-0453R1 11.5mm TiN Solid Carbide Twist Drill

This is a Seco Tools SD25-04531-221-0453R1 solid carbide twist drill, EDP 56387, manufactured in Sweden and supplied new in original Seco packaging (new — other condition, box shows shelf wear). The SD25 series designation indicates a solid carbide jobber-style drill with a straight cylindrical shank; the part number decodes as follows: 04531 = 11.5mm cutting diameter (4.531 decimal inch segment is a Seco internal code resolving to 11.5mm / 0.4531 in), 221 = 2-flute, 118° point angle geometry, 0453 = shank diameter 12mm (per Seco SD25 standard for this diameter range), R1 = TiN (Titanium Nitride) coating. The bright gold TiN coating is clearly visible in all photos, consistent with the R1 coating suffix in Seco's SD25 nomenclature, and provides increased surface hardness and lubricity for drilling steel, cast iron, and aluminum alloys at elevated surface speeds compared to uncoated carbide. The straight shank is uncoated/bare steel-finish for positive grip in standard drill chucks and collet holders compatible with 12mm shank diameter.

Product Specifications