Hertel 8850583 TPG322 Turning Insert Cermet Neutral Triangle

Product Description

The HERTEL 8850583 is a TPG-style cermet turning insert designed for precision metal cutting on CNC lathes and turning centers. Manufactured in a 60-degree triangular shape with a positive rake geometry, this uncoated cermet insert offers strong wear resistance and thermal stability at elevated cutting speeds. It carries a neutral hand orientation, making it compatible with standard TPG toolholders without left- or right-hand restrictions. Key dimensional specs include a 3/8-inch inscribed circle, 1/8-inch insert thickness, and a 1/32-inch corner radius. The grade designation HT115CR identifies the cermet substrate blend suited to finishing and semi-finishing passes on ferrous materials. Installation is handled by licensed machinists and CNC operators in production and job-shop environments.

This insert is primarily used in turning operations on steel, stainless steel, and cast iron where a fine surface finish and close dimensional tolerance are required. The TPG322 style seats in a top-clamp toolholder with a P-clearance pocket, a G-tolerance seat, and an 11-degree relief angle. Typical applications include OD turning finish passes at moderate-to-high cutting speeds where cermet grades outperform uncoated carbide in terms of edge retention and built-up-edge resistance. The neutral hand design suits both conventional and multi-directional turning setups on standard and Swiss-style lathes.

Key Features

• Cermet substrate (uncoated) provides high wear resistance and clean surface finish on ferrous workpieces
• 60-degree triangular insert shape with positive rake for reduced cutting forces
• 1/32-inch corner radius balances edge strength with finish quality
• 11-degree relief angle (clearance code P) minimizes flank wear on finish passes
• Neutral hand orientation fits standard TPG toolholder pockets without special orientation
• No chip breaker geometry for unobstructed chip flow on light finishing cuts

Compatibility

Designed for use in TPG-style top-clamp toolholders with a P-clearance, G-tolerance pocket accepting a 322-size triangular insert. No specific compatible model numbers or system families were provided in the product data.

Installation Notes

Turning inserts should be seated and clamped by a qualified machinist following the toolholder manufacturer's torque and clamping procedures. Power down and lock out the spindle before changing inserts. Handle cermet inserts carefully — the substrate is brittle and can chip if dropped or impacted against hard surfaces. Verify insert seating, shim condition, and clamp engagement before resuming cutting operations.