Iscar 6403359 Threading Insert Carbide IC908 Internal

Product Description

The ISCAR 6403359 is a carbide threading insert designed for internal thread cutting applications. It carries the GEPI insert style and is manufactured to a Partial Profile 60-degree thread standard, making it suitable for generating internal threads across a range of pitch sizes. The insert is produced from carbide substrate and finished with a PVD-applied IC908 grade coating, which provides wear resistance and thermal stability under continuous cutting conditions. With a cutting tip width of 2.50 mm and a corner radius of 0.05 mm, this insert delivers precise thread geometry. It is used by machinists and toolroom professionals on CNC lathes and threading centers.

This insert belongs to the Cut Grip and IscarThread series and is intended for internal threading operations on machining centers and turning equipment. The MT chipbreaker geometry controls chip evacuation during threading passes on ferrous and non-ferrous materials. The Partial Profile 60-degree configuration covers a pitch range that includes 0.90 mm and 28 TPI, making it applicable across metric and unified internal thread profiles in production and job-shop environments. It is sold individually but requires a minimum order quantity of 10 units.

Key Features

• IC908 grade PVD-coated carbide substrate for extended tool life in internal threading
• Partial Profile 60-degree thread form covers both metric and unified thread standards
• MT chipbreaker promotes reliable chip control during internal threading passes
• Corner radius of 0.05 mm for accurate thread root geometry
• Cutting tip width of 2.50 mm suits fine-pitch internal threading operations
• Compliant with ISO 13399 insert identification standards

Compatibility

Designed as an OEM-style replacement threading insert for toolholders and boring bars that accept the GEPI insert style within the ISCAR Cut Grip and IscarThread series.

Installation Notes

Installation should be performed by a qualified machinist or toolroom technician. Ensure the machine spindle is fully stopped and all energy sources are locked out before seating or replacing the insert. Use the correct torx or hex key to torque the clamping screw to the toolholder specification without over-torquing the carbide seat. Inspect the insert pocket and seating surface for chips or debris before mounting a new insert.