Kennametal 3781253 Grooving Insert KCU25 3mm Carbide Altin

Product Description

The KENNAMETAL 3781253 is a solid carbide grooving insert designed for precision groove turning and parting operations on CNC lathes and turning centers. Running in the A4 insert series with an A4G0300GUP geometry, this insert delivers a 3.00 mm cutting width and a maximum depth of cut of 2.90 mm. The physical vapor deposition (PVD) AlTiN coating provides elevated heat resistance and wear performance during interrupted and continuous cuts. A positive rake geometry and GUP chip breaker promote controlled chip evacuation. This insert is installed and replaced by CNC machinists and tool-room technicians as part of routine tooling maintenance on grooving and parting applications.

This insert is suited for grooving, parting, and recessing operations on ferrous and non-ferrous workpiece materials in both production and job-shop turning environments. The neutral hand orientation allows use in standard straight-approach grooving setups. The KCU25 grade, rated as material grade C2 and C6, is applicable across a broad range of general-purpose turning work where a coated carbide solution is appropriate. The 0.20 mm corner radius (0.0079 inches) supports clean groove floor geometry without excessive stress concentration at the cutting edge.

Key Features

• 3.00 mm cutting width with a maximum depth of cut of 2.90 mm for consistent groove sizing
• PVD AlTiN coating delivers elevated heat and oxidation resistance
• GUP chip breaker geometry promotes reliable chip control during grooving passes
• Positive rake design reduces cutting forces on the workpiece and toolholder
• KCU25 solid carbide grade (C2/C6) covers a broad range of general-purpose turning materials
• 0.20 mm corner radius maintains groove floor accuracy

Compatibility

Designed as an OEM-style replacement for A4 series grooving toolholders and insert seats that accept the A4G0300GUP insert geometry. Verify toolholder pocket specifications before installation to confirm correct seating and clamping.

Installation Notes

Grooving inserts should be installed by qualified CNC machinists or toolroom personnel. Power down and lock out the machine spindle before changing inserts. Use the correct torque wrench and clamping screw specified by the toolholder manufacturer — do not overtighten, as this can fracture the carbide body. Confirm insert seating and edge condition before resuming cuts.