Seco 02747780 Milling Insert MK1500 Solid Carbide Octagon

Product Description

The SECO 02747780 is a solid carbide milling insert carrying ANSI and ISO designation ONEU090520ZZTN4-M14 and manufactured in the MK1500 grade. This double-sided, octagon-shaped insert features four cutting edges with a wiper cutting edge style and a negative rake angle of 15 degrees. The CVD-applied Duratomic coating — TiCN plus Al2O3 — delivers wear resistance suited to high-volume milling in cast iron. Insert thickness is 0.2189 inches with an inscribed circle of 0.8429 inches. The M14 chip breaker geometry controls chip flow during interrupted and continuous cuts. This insert is held in the cutter body by screw clamping and is designed for use by machining professionals in production environments.

This insert is optimized for milling cast iron workpieces, covering primary material grade code K applications. It fits SECO cutter series R220.48-09 and L220.48-09. Maximum depth of cut is 0.2480 inches, and the cutting edge effective length is 0.2480 inches. The neutral hand orientation allows use in right-hand and left-hand cutter configurations. Typical applications include face milling and shoulder milling of gray iron, ductile iron, and similar ferrous castings in both job-shop and production-line settings.

Key Features

• Double-sided octagon body provides 4 usable cutting edges per insert, extending tool economy
• Duratomic CVD coating — TiCN plus Al2O3 — engineered for abrasion resistance in cast iron milling
• Wiper cutting edge style improves surface finish at standard feed rates
• M14 chip breaker geometry manages chip evacuation in continuous and interrupted cuts
• Negative rake angle with 135-degree included angle adds edge strength for demanding cuts
• Screw-held insert style for secure, repeatable seating in compatible cutter bodies

Compatibility

Compatible with SECO cutter series R220.48-09 and L220.48-09. Insert style is ONEU, insert size code 090520, matching tools designed for ONEU-09 series inserts. Confirm cutter pocket geometry and screw specification before installation.

Installation Notes

Installation is performed by qualified machinists or tooling technicians. Disengage and lock out the machine spindle completely before seating or removing inserts. Use the manufacturer-specified torx or hex key to tighten the clamping screw — avoid over-torquing, which can crack the carbide body. Inspect the cutter pocket for chips, wear, or damage before fitting a new insert, as contaminated pockets cause premature edge failure.