Kyocera RNMG120400 CA125P TMK00176 Round Insert - Contour Turning

Product Overview

The RNMG120400 is a premium-grade indexable carbide insert from Kyocera, featuring the advanced CA125P PVD-coated substrate. This round insert is engineered for general purpose applications in CNC turning centers, delivering exceptional surface quality, dimensional stability, and extended tool life across a broad range of ferrous materials.

Designed to ISO 1832 standards, the RNMG120400 combines optimized macro and micro geometry with a high-performance coating system to withstand the demanding thermal and mechanical loads of modern machining. Whether you are performing high-precision finishing or medium-duty roughing, this insert provides consistent chip control and reliable performance.

ISO Designation Breakdown

The RNMG120400 designation follows the international ISO 1832 standard for indexable inserts. Each character in the code represents a specific geometric or physical parameter:

Engineering Dimensions & Geometry

All dimensions are manufactured to ISO 1832 Class M tolerances, ensuring interchangeability across compatible toolholders from major manufacturers:

Grade Details - Key Grade Characteristics

CA125P is a PVD-coated carbide grade engineered for high-performance steel machining. The multi-layer coating combines TiAlN and TiN layers to provide exceptional heat resistance and wear protection at elevated cutting temperatures. The substrate features optimized cobalt content for enhanced toughness and crack resistance.

Grade Comparison Matrix

Select the optimal grade for your application by comparing key performance characteristics across the CA100P series:

Chipbreaker Profile

The Standard Geometry chipbreaker geometry is specifically designed for general purpose. This profile features optimized rake angles and groove geometry to ensure effective chip control across the recommended feed range. The raised land design provides edge strength while maintaining cutting edge sharpness for general purpose.

Recommended Applications & Workpiece Materials

The CA125P grade combined with the RNMG120400 geometry is optimized for the following material groups:

• Carbon Steels (C35, C45, C60): Excellent chip control and surface finish at medium to high speeds
• Alloy Steels (42CrMo4, 16MnCr5): Balanced wear resistance and toughness for interrupted cuts
• Stainless Steels (304, 316, 430): Reduced built-up edge thanks to sharp cutting edge and smooth coating
• Tool Steels (H11, H13): Reliable performance at reduced speeds with adequate coolant
• Cast Irons (GG25, GGG40): Good abrasion resistance and thermal crack resistance

Application Map by Operation

Below is a suitability matrix for common turning operations using the RNMG120400:

Recommended Cutting Conditions

Parameters below are starting recommendations. Optimize based on your specific machine rigidity, workpiece condition, and coolant setup:

Operating Guidelines

Follow these best practices to maximize tool life and machining quality:

• Always use adequate coolant flow (minimum 5-8% emulsion concentration) for steel machining
• Ensure rigid workpiece clamping and minimal tool overhang to prevent vibration
• Verify insert seat condition in toolholder before mounting - clean chips and debris
• Use torque wrench for clamping screw (recommended 2.5-3.5 Nm for M3.5 screws)
• Monitor flank wear (VB) and replace insert when wear land exceeds 0.3mm for finishing or 0.6mm for roughing
• For interrupted cuts, reduce cutting speed by 20-30% to prevent thermal cracking
• Store inserts in original packaging away from direct sunlight and moisture

Toolholder Compatibility

The RNMG120400 is compatible with the following ISO standard toolholder families:

SRGCR/L, SRDCN, SRGCN, SRSCN series toolholders with round insert pockets

Ensure the toolholder pocket matches the insert shape and inscribed circle diameter (IC). Use genuine Kyocera toolholders or equivalent ISO-compliant holders for optimal performance and safety.

Packaging & Ordering Information

Catalog Meta Data