CNMG120408PM YBC252 CVD Coated Carbide Turning Insert with PM Chipbreaker for Carbon Alloy Steel

The ZCCCT CNMG120408PM YBC252 is a robust 80° diamond (rhombic) negative rake carbide turning insert from ZCC Cutting Tools (ZCCCT, Zhuzhou Diamond) – China’s premier manufacturer of indexable cutting tools. Engineered for general-purpose semi-finishing and light roughing of carbon and alloy steels, it features a PM chipbreaker and premium YBC252 CVD coating for balanced wear resistance and toughness in continuous to moderately interrupted turning.

• Model: CNMG120408PM YBC252 (YBC25 is commonly referenced as YBC252 in ZCCCT grading)
• Brand: ZCCCT (Zhuzhou Diamond Cutting Tools, China)
• Geometry: CNMG = 80° diamond, 0° rake angle, M tolerance, with mounting hole
• Dimensions: 12 = IC 12.7 mm; 04 = thickness 4.76 mm; 08 = corner radius 0.8 mm
• Chipbreaker: PM – optimized for semi-finishing, low cutting force, good chip control
• Grade: YBC252 – CVD coated (TiCN+Al₂O₃) carbide, Black Diamond Series for steel
• Coating: Thick CVD multilayer (TiCN base + Al₂O₃ top), high heat & wear resistance
• Edges: 4 usable corners; rigid substrate resists deformation under moderate loads

• Carbon steels (Q235, 1045, S45C) – primary
• Alloy steels (4140, 42CrMo4, SCM440, HRC < 48)
• Low‑alloy steels (continuous turning)
• Grey cast iron (light semi‑finishing only)

• External turning & facing (semi‑finish/light roughing)
• Boring & profiling (continuous cuts)
• General‑purpose CNC turning (mass production)
• Dry or wet machining (stable performance)

Combines a tough PM semi‑finish geometry with ZCCCT’s reliable YBC252 CVD grade. Delivers long tool life, consistent surface finish, and excellent value for mid‑range steel turning. Ideal for job shops and mass production seeking stable, cost‑effective performance.