Hertel 1001816 Turning Insert Ccmt 21.51-H2U HC305T

Product Description

The HERTEL 1001816 is a solid carbide turning insert in the CCMT style, designed for precision external and internal turning operations on CNC and manual lathes. It carries the HC305T material grade with an Al2O3 (aluminum oxide) CVD coating, offering strong wear resistance and thermal stability during metal removal. The insert features an 80-degree diamond shape, a 1/4-inch inscribed circle, a 1/64-inch corner radius, and a positive rake geometry with a honed cutting edge. A screw-on holding method provides secure clamping at the toolholder. Licensed machinists and CNC operators use this insert for finishing and semi-finishing passes where dimensional accuracy and surface finish are priorities.

This insert is intended for cutting ISO material group K workpieces, which includes cast irons and hardened materials. The CCMT 21.51 insert size code and ISO code CCMT060204 identify the exact geometry for toolholder matching. The T-style chip breaker designation controls chip flow during finish turning, making this insert suitable for light-to-medium depth-of-cut applications in production and job-shop environments. It is packaged individually and sold in multiples of 10.

Key Features

• HC305T solid carbide substrate with Al2O3 CVD coating for wear and thermal resistance
• 80-degree diamond insert shape (Shape Code C) for versatile turning and profiling
• Positive rake geometry with honed cutting edge for clean, accurate cuts
• 1/64-inch corner radius (0.0156 inches) suited to finish and semi-finish turning
• T-style chip breaker for controlled chip evacuation during light-to-medium cuts
• Screw-on insert holding method for repeatable indexing and secure seating

Compatibility

Compatible with CCMT-style toolholders accepting an insert size code of 21.51 (ISO CCMT060204). Verify toolholder clearance code C and tolerance code M compliance before installation.

Installation Notes

Installation is performed by qualified machinists or CNC setup technicians. Power down and lock out the machine spindle before indexing or replacing inserts. Use the appropriate torx or hex key to seat the clamping screw to the toolholder manufacturer's specified torque without overtightening. Inspect the toolholder pocket for chips or debris before seating the insert to ensure proper contact and prevent premature edge failure.