Kennametal 4109938 Threading Insert NT2L KCU25

Product Description

The KENNAMETAL 4109938 is a carbide threading insert in the NT2L style with KCU25 grade designation, designed for threading operations on CNC lathes and turning centers. It handles external pitch ranges of 0.70 to 3.00 mm and 8 to 36 TPI, and internal pitch ranges of 1.25 to 3.50 mm and 7 to 20 TPI. The KCU25 grade provides a balance of toughness and wear resistance suited to interrupted cuts and variable-feed threading passes. Machinists and CNC programmers in production and job-shop environments rely on inserts like this for repeatable thread form accuracy across a wide pitch range.

This threading insert is used in metalworking applications where precise thread profiles are required on external or internal features of turned components. Typical installations include general-purpose threading on ferrous and non-ferrous workpieces in both production and maintenance machining environments. The wide pitch coverage makes it adaptable to both coarse and fine thread standards, reducing the number of insert grades a shop needs to stock for threading operations.

Key Features

• External pitch range of 0.70 to 3.00 mm covers 8 to 36 TPI for broad threading versatility
• Internal pitch range of 1.25 to 3.50 mm covers 7 to 20 TPI
• NT2L insert style for standard threading toolholders
• KCU25 carbide grade balances toughness and wear resistance
• Single insert per package; minimum order quantity of 5 pieces

Compatibility

Designed for use with NT2L-style threading toolholders and boring bars accepting the NT2L insert seat. Confirm toolholder manufacturer specifications before installation to ensure correct seat geometry and clamping method.

Installation Notes

Threading inserts are installed and changed by qualified machinists or CNC operators. Power down and lock out the machine spindle before any insert change. Seat the insert fully and evenly against the pocket locating surfaces before torquing the clamping screw to the toolholder specification. Inspect the insert edge and thread form after the first threading pass to confirm profile accuracy before running production quantities.