Sumitomo 16FSW33 Pcbn Turning Insert 1/4 in Ic

Product Description

The SUMITOMO 16FSW33 is a polycrystalline cubic boron nitride (PCBN) turning insert designed for high-performance metal cutting applications. This uncoated, triangular insert features a 1/4 inch inscribed circle, a 1/64 inch corner radius, and a positive rake geometry. Manufactured to the BN700 grade, it delivers the hardness and thermal resistance required when machining difficult materials at production speeds. The screw-holding method provides secure clamping during interrupted and continuous cuts. Licensed HVAC techs and machinists working in precision metalworking environments will find this insert suited for demanding turning operations on hard or abrasive workpiece materials.

The 16FSW33 is intended for turning cast iron and superalloy workpieces where conventional carbide tooling falls short. Its three cutting edges extend tool life per insert, reducing changeover frequency on production lathes and CNC turning centers. The 3NU-TCGA insert style and T-series designation align with standard toolholders designed for triangular inserts with a 7-degree relief angle. This insert is appropriate for both roughing and finishing passes on hard materials in industrial machining environments.

Key Features

• PCBN (BN700 grade) construction — engineered for hardened cast iron and superalloy turning
• Uncoated bright finish with positive rake for reduced cutting forces
• Triangle insert shape with 60-degree included angle and 3 usable cutting edges
• 1/4 inch inscribed circle with 1/64 inch corner radius for controlled surface finish
• Screw-holding method (3NU-TCGA style) for rigid, repeatable insert seating
• Meets ANSI and ISO 13399 standards; ISO code 3NU-TCGW110204

Compatibility

Designed for use in toolholders accepting 3NU-TCGA style triangular turning inserts with a screw-holding method. Primary workpiece materials are cast iron and superalloys per ISO material codes K and S.

Installation Notes

Installation is performed by a qualified machinist or toolroom technician. Power down and fully stop the spindle before indexing or replacing inserts. Use the correct torque driver for the mounting screw to ensure proper clamping without cracking the PCBN substrate. Verify toolholder pocket cleanliness and seating surface condition before each insert change to maintain positional accuracy.