Sumitomo 10JT273 Cermet Turning Insert 3/8 in Ic

Product Description

The SUMITOMO 10JT273 is a cermet turning insert designed for precision metal cutting operations on CNC lathes and turning centers. Built to ANSI and ISO 13399 standards, this triangular insert features a 60-degree included angle, a 3/8-inch inscribed circle, and a 1/64-inch corner radius. The T1500A grade cermet substrate offers a bright, uncoated finish suited for finishing and semi-finishing passes on steel workpieces. It is installed and indexed by licensed machinists and CNC operators working in production or job-shop environments.

This insert is intended for left-hand cutting applications on steel workpieces, classified under ISO material code P. It fits into TNPL-style toolholders using a clamp and pin holding method. The negative rake geometry and N clearance code make it appropriate for rigid setups where surface finish and dimensional accuracy are priorities. Typical applications include external turning, facing, and light contouring on ferrous materials.

Key Features

• Cermet insert material with T1500A grade for steel finishing and semi-finishing
• 60-degree triangle insert shape with negative rake for stable, rigid cutting
• 3/8-inch inscribed circle and 1/64-inch corner radius for precise fitment and edge geometry
• Left-hand cutting orientation for TNPL-series toolholders
• Bright, uncoated finish — no coating delamination risk on delicate finishes
• Meets ANSI and ISO 13399 standards with ISO code TNGG160304L-ST

Compatibility

Designed for use in TNPL-style insert toolholders using clamp and pin clamping. Insert style code TNPL, series TNP. Verify toolholder pocket geometry and clamping system before installation.

Installation Notes

Insert installation and indexing should be performed by a qualified machinist or CNC operator. Power down and lock out the machine before changing inserts. Use the appropriate torque wrench for the clamping screw — do not overtighten, as cermet is a brittle substrate that can crack under excess clamping force. Inspect the toolholder pocket for chips, wear, or debris before seating the insert.