Tungaloy 6818020 Pcbn Turning Insert 35 Diamond Qp Mini-tip

Product Description

The TUNGALOY 6818020 is a polycrystalline cubic boron nitride (PCBN) turning insert in the QP Mini-Tip series, designed for precision turning and profiling operations on hardened ferrous materials and superalloys. This uncoated PCBN insert features a 35-degree diamond geometry, a 3/8-inch inscribed circle (IC), and a 1/64-inch corner radius. The compact geometry targets fine finish turning and small-feature profiling. It is installed and replaced by machinists and CNC lathe operators in production and job-shop environments where tool life and edge integrity on hard materials are critical.

The 6818020 is suited for finishing and semi-finishing passes on hardened steels, cast irons, and similar hard or abrasive workpiece materials. The QP Mini-Tip design supports applications where a small nose geometry improves access to tight profiles or shoulder features. Typical installations include CNC turning centers and engine lathes running moderate-to-high surface speeds without coolant or with minimal lubrication, consistent with PCBN best practices on hardened stock.

Key Features

• Polycrystalline cubic boron nitride (PCBN) substrate for high hardness and thermal resistance
• Uncoated PCBN edge for consistent edge geometry on hardened ferrous and superalloy workpieces
• 35-degree diamond insert geometry for tight-profile and shoulder-turning access
• 3/8-inch inscribed circle for compact toolholder compatibility
• 1/64-inch corner radius for fine-finish surface results
• QP Mini-Tip series design supports precision small-feature profiling

Compatibility

Designed as an OEM-style indexable insert for TUNGALOY QP Mini-Tip series toolholders accepting VNGA-style 35-degree diamond PCBN inserts with a 3/8-inch inscribed circle.

Installation Notes

PCBN turning inserts are installed by qualified machinists following machine tool manufacturer torquing guidelines for indexable insert clamping systems. Power down and lock out the machine spindle before seating or indexing the insert. Inspect the insert pocket and clamping hardware for wear or debris before installation. PCBN edges are brittle and should not be used for interrupted cuts or on non-hardened soft steels unless the manufacturer specifically recommends it.