Sumitomo 1655FEN Pcbn Turning Insert Diamond Neutral DA90

Product Description

The SUMITOMO 1655FEN is a Polycrystalline Cubic Boron Nitride (PCBN) turning insert designed for precision machining of hardened ferrous materials, cast iron, and superalloys. This uncoated, neutral-hand insert features a diamond shape (D) with a 6.35 mm inscribed circle and a 0.2 mm corner radius, making it well-suited for finishing and semi-finishing operations where tight tolerances and surface finish quality are critical. Screw-held and conforming to DCMA insert style, the 1655FEN carries the DA90 manufacturer grade designation. Machinists and toolroom professionals select PCBN inserts when carbide tooling reaches its performance limits in high-hardness applications.

This insert is used in CNC turning centers and rigid manual lathes handling hardened steels, chilled cast iron, and powder-metal components. The diamond insert shape provides a strong cutting edge geometry suited to light to moderate interrupted and continuous cuts. The maximum depth of cut is 0.50 mm, positioning this insert for finishing passes rather than heavy roughing. The DA90 series is intended for operations where surface integrity and dimensional repeatability are the primary performance requirements. Installation is performed by qualified machinists and toolroom technicians as part of a standard indexable insert toolholder setup.

Key Features

• PCBN (Polycrystalline Cubic Boron Nitride) insert material for machining hardened and abrasive workpieces
• Diamond insert shape (Shape Code D) with DCMA insert style for versatile turning geometry
• Uncoated bright finish with neutral hand orientation
• 0.2 mm corner radius for precise finishing passes with controlled surface finish
• Maximum depth of cut of 0.50 mm optimized for finishing and semi-finishing operations
• Screw-held mounting method compatible with standard DCMA-style indexable toolholders

Compatibility

Designed as an OEM-style replacement or direct application insert for use in indexable turning toolholders accepting DCMA-style PCBN inserts with a 2.80 mm hole diameter and 6.35 mm inscribed circle. No specific model compatibility data was provided in the product input.

Installation Notes

Insert installation and indexing should be performed by a qualified machinist with the machine spindle fully stopped and all energy sources locked out per OSHA lockout/tagout procedures. Use the appropriate torx or hex key to secure the clamping screw to the toolholder manufacturer's recommended seating procedure — do not overtighten. Inspect the insert seat and toolholder pocket for chips or debris before seating a new insert. PCBN inserts are brittle; avoid impact or dropping during handling.