Iscar 5669459 Carbide Thread Mill Insert Un 16 Tpi

Product Description

The ISCAR 5669459 is a carbide thread mill insert designed for internal UN threading operations at 16 teeth per inch. Part of the ISCAR MillThread series, this insert carries the IC908 manufacturer grade with a TiAlN coating applied via PVD process. The submicron carbide substrate provides wear resistance across a broad range of workpiece materials. At 0.126 inches thick and 7.90 mm in width, the MT-LNHU insert style fits dedicated MillThread toolholders and is installed by machinists and CNC tooling specialists in production and job-shop environments.

This insert is suited for internal thread milling on a universal range of workpiece materials, including ferrous, non-ferrous, heat-resistant alloys, and hardened steels, as indicated by the primary workpiece material codes H, K, M, P, and S. The UN thread standard and 16 TPI configuration make it applicable to common unified national thread forms encountered in general manufacturing, aerospace, and industrial fabrication. It is sold individually with a minimum order quantity of 2 units.

Key Features

• IC908 grade submicron carbide substrate for extended tool life
• TiAlN coating via PVD process for heat and wear resistance
• MT-LNHU insert style, size code 1403, compatible with MillThread series holders
• Internal UN thread form at 16 TPI
• Universal workpiece material coverage: H, K, M, P, and S material codes
• Compliant with ISO 13399 tooling data standards

Compatibility

Designed for use with ISCAR MillThread series toolholders accepting the MT-LNHU 1403 insert style. Specific holder compatibility should be verified against ISCAR MillThread toolholder documentation for the MT-LNHU insert form.

Installation Notes

Thread mill inserts of this type are installed and indexed by qualified machinists or CNC tooling technicians. Ensure the machine spindle is fully stopped and the toolholder is secured in a fixture before seating or replacing the insert. Use the correct torx or clamping key as specified by the toolholder manufacturer — do not overtighten the clamping screw beyond the holder specification. Verify insert seating and runout before resuming cutting operations.