Hertel 8852074 Ceramic Turning Insert CNGA643T00825

Product Description

The HERTEL 8852074 is a ceramic uncoated turning insert designed for precision metal cutting operations on CNC lathes and turning centers. Manufactured to the CNGA643T00825 style designation with an HT601CA ceramic grade, this insert features an 80-degree diamond shape with a negative rake angle and neutral hand orientation. The inscribed circle measures 0.75 inches and the insert length is 0.748 inches. With a corner radius of 0.0469 inches (3/64 inch) and a relief angle of zero degrees, this insert is suited for high-speed finishing and semi-finishing passes on hard materials where ceramic tooling provides a thermal and wear advantage over carbide.

This insert is used in external turning, facing, and profiling applications in production machining environments. It is appropriate for machining hardened steels, cast irons, and high-temperature alloys where ceramic cutting materials outperform conventional carbide at elevated surface speeds. The CNGA insert style is a standard configuration commonly found in both high-volume production shops and precision job shops. The neutral hand allows use in either left-hand or right-hand toolholder setups depending on the application. The HT601CA grade is a ceramic formulation suited to dry or minimal-coolant cutting conditions.

Key Features

• Ceramic uncoated insert grade HT601CA for high-speed dry or minimal-coolant machining
• 80-degree diamond insert shape (Shape Code C) for versatile turning and profiling geometry
• Negative rake angle with CNGA style for strong cutting edge and chipping resistance
• Corner radius of 0.0469 inches (3/64 inch) for controlled surface finish
• Neutral hand orientation compatible with left-hand and right-hand toolholders
• Clamp and pin insert holding method for secure, repeatable seating in standard CNGA toolholders

Compatibility

Designed as a standard CNGA-style turning insert for use with compatible CNGA toolholders accepting a 0.75-inch inscribed circle, 0.25-inch thick diamond insert with clamp and pin retention.

Installation Notes

Installation and indexing of turning inserts should be performed by a qualified machinist or tooling technician with the machine spindle fully stopped and the machine locked out per applicable safety procedures. Use the correct torque driver for the clamping screw to ensure proper seating without cracking the ceramic insert body. Ceramic inserts are brittle and should not be subjected to interrupted cuts, heavy shock loads, or coolant thermal shock unless the grade is rated for those conditions. Inspect the toolholder pocket and locating pin for wear or debris before seating each new insert.