Kyocera SNMM120412PX CA125P TMK00200 Insert - Heavy Roughing

Product Overview

The SNMM120412PX CA125P (MPN: TMK00200) is a premium square 90° solid negative turning insert from Kyocera's advanced CA125P grade lineup. Designed for heavy roughing operations, this insert combines a fine-grain carbide substrate with a multi-layer PVD TiAlN coating to deliver exceptional wear resistance and surface quality. The Performance Xtreme PX chipbreaker geometry ensures reliable chip evacuation across a wide range of cutting parameters, making it ideal for alloy steel, cast iron applications. With an inscribed circle of 12.7 mm, thickness of 4.76 mm, and a 1.2 mm nose radius, the SNMM120412PX offers precise dimensional control and repeatability for high-volume CNC production environments. The insert is solid, no hole (M-type clamp system), compatible with standard MSSNR / MSSNL (solid insert, clamp-type) toolholders.

ISO Designation Breakdown

The SNMM120412PX designation follows ISO 1832:2004 standard nomenclature for indexable inserts:

Engineering Dimensions & Geometry

All dimensions conform to ISO 1832 tolerance class M (medium precision):

Grade Details – Key Grade Characteristics

CA125P is a PVD-coated grade optimized for steel and stainless steel machining:

• Substrate: Fine-grain tungsten carbide (WC-Co) with 10% cobalt binder for optimal hardness-toughness balance
• Coating: Multi-layer PVD TiAlN (Titanium Aluminum Nitride) – provides exceptional oxidation resistance up to 900°C
• Hardness: 92.5 HRA (1600 HV30) – suitable for high-speed finishing and medium roughing
• Transverse Rupture Strength: 3,200 MPa – resists chipping in interrupted cuts
• Friction Coefficient: 0.35 against steel – reduces built-up edge and improves surface finish
• Color Code: Copper-bronze PVD coating appearance for easy grade identification

Grade Comparison Matrix

Compare CA125P with adjacent grades in the Kyocera portfolio:

Chipbreaker Profile

The PX chipbreaker features a performance xtreme geometry specifically engineered for heavy roughing. The land width is optimized at 0.15–0.30 mm with a positive rake angle of 10–14°, creating a controlled chip curl radius of approximately 4–8 mm. The groove depth transitions smoothly from 0.08 mm at the nose to 0.15 mm along the cutting edge, ensuring consistent chip breakage across the recommended feed range. This design minimizes cutting forces by 10–15% compared to flat-top inserts, reducing heat generation and extending tool life by up to 20% in continuous cutting applications.

Recommended Applications & Workpiece Materials

The SNMM120412PX CA125P is recommended for the following materials:

• Carbon Steel: C35, C45, C60 – excellent chip control and surface finish (Ra 0.8–1.6 µm)
• Alloy Steel: 42CrMo4, 34CrNiMo6 – stable performance at moderate to high speeds
• Stainless Steel: 304, 316 (austenitic) – reduced adhesion due to PVD coating
• Tool Steel: H13, D2 (pre-hardened ≤45 HRC) – limited roughing capability
• Cast Iron: GJL-250 (gray cast iron) – acceptable; not recommended for nodular iron

Application Map by Operation

Recommended Cutting Conditions

Parameters for Alloy Steel, Cast Iron using the SNMM120412PX CA125P:

Note: Values are starting recommendations. Optimize based on machine rigidity, workpiece condition, and coolant delivery. Reduce Vc by 15% for interrupted cuts or scale buildup.

Operating Guidelines

• Always verify toolholder seat condition before insert seating – debris causes micro-fractures
• Use torque-calibrated clamping lever; over-torque cracks the insert, under-torque causes vibration
• Recommended minimum coolant pressure: 5 bar (70 psi) for chip evacuation
• First pass engagement: reduce feed by 30% for the first 5 mm to stabilize cutting edge
• Insert indexing interval: inspect flank wear every 15 minutes; index at VB = 0.15–0.20 mm
• Storage: maintain inserts in original packaging at <60% relative humidity and 15–25°C
• Do not mix used and new inserts on the same toolholder – imbalance causes chatter

Toolholder Compatibility

Compatible with standard 90° square negative toolholders (S-type):

Ensure toolholder seat angle is 0° and clamping system is rated for the insert thickness (4.76 mm).

Packaging & Ordering Information

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