Seco 00000375 Turning Insert CNMG643-MR4 883 Carbide

Product Description

The SECO 00000375 is a solid carbide, uncoated turning insert in the CNMG-MR4 series, designed for precision metal cutting on CNC lathes and turning centers. It features an 80-degree diamond insert shape, a 3/4-inch inscribed circle, and a 3/64-inch corner radius. The MR4 chip breaker geometry and T-Land cutting edge style are optimized for stable, controlled chip formation. With a negative rake angle and four available cutting edges, this insert delivers consistent performance in high-demand turning, facing, and boring operations. Licensed HVAC technicians, machinists, and tooling professionals handling superalloy and titanium components will find the grade 883 substrate suited for demanding material conditions.

This insert is intended for turning, facing, and boring applications where the primary workpiece material is superalloys and titanium, with secondary suitability for steel, cast iron, non-ferrous materials, and hardened materials. The CNMG643-MR4 industry standard number indicates compatibility with standard CNMG-style toolholders that accept clamp, pin, or lever lock holding methods. It is appropriate for both roughing and semi-finishing passes on difficult-to-machine alloys in aerospace, energy, and industrial manufacturing environments.

Key Features

• Solid carbide, bright/uncoated substrate — grade 883, optimized for superalloys and titanium (material grades S10, S20, S30)
• 80-degree diamond insert shape (Shape Code C) with T-Land cutting edge style for edge strength and stability
• MR4 chip breaker geometry engineered for reliable chip control in boring, facing, and turning
• Four usable cutting edges per insert — reduces per-edge tooling cost
• Negative rake, neutral hand — compatible with standard CNMG clamp, pin, and lever lock toolholders
• Conforms to ANSI and ISO standards; ISO code CNMG190612-MR4

Compatibility

Designed as a direct-fit replacement for standard CNMG-style toolholders using clamp, pin, or lever lock holding methods. Industry standard number CNMG643-MR4 and ISO code CNMG190612-MR4 identify compatible toolholder pockets. Suitable for multi-use applications including boring, facing, and turning across superalloys, titanium, steel, cast iron, non-ferrous, and hardened workpiece materials.

Installation Notes

Installation should be performed by a qualified machinist or tooling technician. Before seating the insert, ensure the toolholder pocket and clamping components are clean and free of chips or debris. Verify the correct clamp or lever lock hardware is in place for the CNMG pocket style before engaging the cutting edge. Always power down and lock out the machine spindle before changing inserts, following facility-specific lockout/tagout procedures.