Iscar 5666820 Milling Insert T490 Lnar 0804PN-R-P IC07

Product Description

The ISCAR 5666820 is a solid carbide milling insert carrying the manufacturer designation T490 LNAR 0804PN-R-P IC07. It belongs to the HELITANG series and is designed for indexable milling applications requiring a negative rake, helical cutting edge geometry. The insert features a butterfly shape with an inscribed circle of 0.167 inches, a thickness of 0.295 inches (7.50 mm), and a corner radius of 0.40 mm (1/64 inch). The IC07 submicron grade is left uncoated and bright-finished, making it well suited for applications where coating adhesion or contamination is a concern. Four cutting edges are available per insert, and the double-sided design maximizes tool life per unit.

This insert is intended for milling stainless steel, non-ferrous metals, superalloys, and titanium — material application codes M, N, and S. It fits the T490 LNK08 cutter series and is screw-held in the toolholder pocket. The maximum depth of cut is 8.00 mm (0.315 inches), and the cutting edge effective length is 0.315 inches. The right-hand orientation and 90-degree included angle make it appropriate for square-shoulder and face milling operations on CNC machining centers handling difficult-to-machine alloys in aerospace, medical, and precision manufacturing environments.

Key Features

• Solid carbide IC07 submicron grade — uncoated, bright finish for stainless steel, non-ferrous, superalloys, and titanium
• HELITANG series helical cutting edge reduces cutting forces on difficult materials
• Double-sided insert with 4 cutting edges for extended tool life per insert
• Negative rake geometry with 90-degree included angle for square-shoulder milling
• Corner radius of 0.40 mm (1/64 inch) for controlled edge strength at fine cutting conditions
• Screw-held mounting for secure, repeatable seating in compatible toolholders

Compatibility

This insert is compatible with the T490 LNK08 cutter series as specified by the manufacturer. The ANSI code is T490 LNAR 0804PN-R-P IC07 and the ISO code is T490 LNAR 0804PN-R-P. The insert conforms to ANSI and ISO 13399 standards.

Installation Notes

Installation is performed by a machinist or tooling technician on a CNC milling machine. The machine spindle must be fully stopped and locked out before changing inserts. Use the appropriate torx or hex key to seat the crew-held insert flush in the pocket, taking care not to overtighten, which can crack the carbide body. Confirm correct hand orientation — this insert is right-hand only — before resuming cutting operations.