Value Collection TCN18510J Turning Insert SPG321 TCN55

Product Description

The VALUE COLLECTION TCN18510J is a solid carbide turning insert with a titanium nitride (TiN) coating, designed for precision metal turning operations on CNC lathes and manual turning centers. It follows the SPG321 ANSI insert code and SPG090304 ISO designation, with a 3/8 inch inscribed circle and a 1/64 inch corner radius. The square insert shape (S) provides four usable cutting edges. The TiN coating improves surface hardness and wear resistance, extending tool life on ferrous workpiece materials. This insert is handled and installed by machinists and CNC operators in production and job-shop environments.

This insert is suited for general-purpose turning of steel and stainless steel workpieces, corresponding to primary workpiece material codes M and P. The flat-top chip breaker geometry and positive side clearance make it appropriate for finish and semi-finish turning passes where controlled chip flow and dimensional accuracy are priorities. It is sold individually but carries a minimum order quantity of 10 units, making it a standard consumable stocked in toolrooms and on CNC turning cells.

Key Features

• Solid carbide substrate with TiN coating for improved wear resistance on steel and stainless workpieces
• Square insert shape with 90-degree included angle — four usable cutting edges per insert
• 3/8 inch inscribed circle and 1/8 inch insert thickness for standard SPG-style toolholders
• 1/64 inch (0.0156 inch) corner radius suitable for finish and semi-finish turning
• Positive side clearance (Clearance Code P) reduces cutting forces and heat buildup at the edge
• Flat-top chip breaker geometry for predictable chip control at moderate feed rates

Compatibility

Designed for use in SPG-style insert toolholders accepting a 3/8 inch inscribed circle, 1/8 inch thick square insert with positive clearance geometry (Clearance Code P, Tolerance Code G, Insert Holding Method: Clamp).

Installation Notes

Installation is performed by a qualified machinist or CNC operator. Power down and lock out the spindle before seating or replacing inserts. Use the correct torque on the clamping screw per the toolholder manufacturer's specification — do not overtighten, as this can fracture the carbide. Inspect the insert pocket and clamp seat for chips or debris before seating a new insert to ensure proper support and edge positioning.