Hertel 8852040 Turning Insert CCMT21.50.5BH Cermet

Product Description

The HERTEL 8852040 is a cermet uncoated turning insert in the CCMT21.50.5BH grade HT115CR configuration. It features an 80-degree diamond (C) shape with a positive rake angle of 5 degrees and a 7-degree relief clearance angle. The insert has a 0.25-inch inscribed circle, a 0.0079-inch corner radius, and an insert length of 0.2362 inches (6.00 mm). Designed for screw-on holding with a chip breaker style T, this insert suits CNC and manual turning operations where cermet material offers wear resistance and surface finish performance on ferrous and non-ferrous workpieces. Licensed machinists and CNC operators are the primary installers.

This insert is suited for external and internal turning applications where fine to medium finishing passes are required. The uncoated cermet substrate performs well on hardened steels, cast iron, and stainless materials at moderate-to-high cutting speeds. The neutral hand orientation allows use in standard right-hand tool holders compatible with the CCMT insert geometry. Typical applications include production turning on CNC lathes in light industrial and precision machining environments.

Key Features

• Cermet uncoated substrate for consistent surface finish and extended tool life on ferrous materials
• 80-degree diamond insert shape (Shape Code C) for versatile turning approaches
• Positive rake geometry with 5-degree rake angle and 7-degree relief angle reduces cutting forces
• 0.0079-inch corner radius suited for finishing and semi-finishing passes
• Screw-on insert holding method for secure, repeatable seating in compatible tool holders
• Chip breaker style T controls chip flow during continuous turning operations

Compatibility

Designed as a direct-fit replacement for CCMT21.50.5-style insert seats in screw-clamp turning tool holders accepting an 80-degree diamond insert with a 0.25-inch inscribed circle and a 0.1100-inch hole diameter.

Installation Notes

Installation is performed by qualified machinists or CNC tooling technicians. Always power down and lock out the machine spindle before indexing or replacing inserts. Use the correct torx or hex key torque driver specified by the tool holder manufacturer to seat the screw without over-torquing the insert pocket. Inspect the insert pocket and seating surfaces for chips or debris before seating the new insert to ensure proper contact and prevent premature edge failure.