Tungaloy 6743685 Pcbn Turning Insert Dnga 432 BXA20

Product Description

The TUNGALOY 6743685 is a Polycrystalline Cubic Boron Nitride (PCBN) turning insert in the DNGA 432 geometry, manufactured under the 2QP-DNGA series (TurnLine). It carries the BXA20 grade with a multilayer TiAlN PVD coating and a medium-grain PCBN substrate. Designed for negative-rake, flat-top chip-breaker operation, this multi-tipped insert delivers two cutting edges per insert. The 55-degree diamond shape, 0.5000-inch inscribed circle, and 0.0315-inch corner radius make it well-suited to interrupted and continuous cuts on hard, abrasive workpiece materials where carbide tooling reaches its limits. A licensed machinist or CNC programmer typically specifies and installs this insert.

This insert is intended for hard-material turning applications including hardened steels, hard cast iron, and similarly demanding workpieces classified under ISO workpiece material code H. It supports turning, facing, boring, back turning, and back boring operations. The 2QP-DNGA series follows ANSI and ISO insert standards, making it compatible with standard DNGA 432 toolholders that accept a clamp-and-pin holding method. Maximum recommended depth of cut is 0.50 mm (0.0197 inches), positioning this insert for finishing and semi-finishing passes rather than heavy roughing.

Key Features

• PCBN insert grade BXA20 with multilayer TiAlN PVD coating for extended tool life on hard materials
• Medium-grain PCBN substrate balances edge toughness and wear resistance
• 55-degree diamond insert shape (code D) with negative rake and honed cutting edge for controlled chip formation
• Two usable cutting edges per insert reduce per-edge tooling cost
• Flat-top chip breaker geometry supports finishing and semi-finishing passes up to 0.50 mm depth of cut
• Clamp and pin holding method compatible with standard DNGA toolholder pockets
• Multi-use capable: turning, facing, boring, back turning, and back boring in a single insert style

Compatibility

Designed as an OEM-style replacement for DNGA 432 insert seats that accept a clamp-and-pin holding method; conforms to ANSI and ISO DNGA 432 standards for direct interchange in compatible toolholders.

Installation Notes

PCBN inserts are installed by a machinist or tooling technician on a CNC lathe or machining center; power down the spindle and engage the machine lockout before indexing or replacing inserts. Seat the insert fully into the pocket and verify clamp and pin engagement before resuming cuts. Avoid interrupted cuts beyond the insert's rated maximum depth of cut, and do not use PCBN inserts on low-hardness workpieces, as they require hard, abrasive materials to perform as intended.