Kyocera TNMG220404PMG CA115P TML00495 Insert - Medium-Duty Turning

Product Overview

The TNMG220404PMG CA115P TML00495 is a premium triangle insert manufactured by Kyocera in Japan. Engineered for medium-duty turning applications, this negative-style insert offers three usable cutting edges per side, delivering exceptional cost-per-edge economy. The versatile geometry for general turning. With 22mm inscribed circle diameter, 4.76mm thickness, and 0.4mm nose radius, this insert provides optimal cutting geometry for medium-duty turning operations on CNC turning centers. The PMG (Positive Medium Groove) geometry combined with CA115P PVD coating ensures reliable chip control, extended tool life, and consistent surface finish across a broad spectrum of steel workpiece materials.

ISO Designation Breakdown

The TNMG220404PMG follows the ISO 1832 standard indexable insert designation system:

• T — Triangle shape (60° equilateral triangle, three cutting edges)
• N — 0° clearance angle (negative insert, double-sided)
• M — Tolerance class ±0.13mm (inscribed circle & thickness)
• G — Cylindrical hole with countersink (double-sided clamping)
• 22 — 22mm inscribed circle diameter (IC)
• 04 — 4.76mm nominal thickness
• 04 — 0.4mm nose radius
• PMG — PMG (Positive Medium Groove) chipbreaker geometry

Engineering Dimensions & Geometry

Grade Details — Key Grade Characteristics

CA115P is a PVD-coated carbide grade specifically developed for steel machining (ISO P15 application group). PVD-coated fine-grained carbide for high-speed steel finishing. The multi-layer PVD coating provides outstanding wear resistance, thermal stability, and extended tool life in both continuous and interrupted cutting conditions.

• Substrate: Fine-grained tungsten carbide (WC-Co) with optimized cobalt binder content
• Coating: Multi-layer PVD, 2–4 μm total thickness
• Hardness: 1,600 HV (Vickers hardness)
• Transverse Rupture Strength: 2,800 MPa
• Application Group: ISO P15 (steel machining)
• Max Operating Temperature: 800°C
• Best For: Steel finishing & semi-finishing

Grade Comparison Matrix

Chipbreaker Profile

The TNMG220404PMG features the PMG (Positive Medium Groove) chipbreaker, ground onto the negative insert substrate to create an effective positive rake geometry. This design combines the economy of double-sided negative inserts with the chip control benefits of a positive groove, making it ideal for medium-duty steel turning.

• Medium-width groove for balanced chip control across feed ranges
• Positive rake angle generated by chipbreaker geometry
• Optimized for medium depths of cut (0.5–3.0mm)
• Reliable chip curl and breakage for steel machining
• Reduced cutting forces compared to flat-top negative inserts
• Suitable for both continuous and lightly interrupted cuts

Recommended Applications & Workpiece Materials

The TNMG220404PMG CA115P is optimized for the following materials and application scenarios:

• Carbon Steels: C35, C45, C50, 1045, 1050 — Excellent performance
• Alloy Steels: 4140, 4340, 16MnCr5, 20MnCr5 — Consistent tool life
• Tool Steels: H13, D2, O1 — Pre-hardened material machining
• Bearing Steels: 100Cr6, 52100 — Precision surface requirements
• Cast Steels: GS-25, GS-45 — General cast steel components

Note: For austenitic stainless steels (304, 316), consider grade CA6535 or PR1225 for optimal performance.

Application Map by Operation

Recommended Cutting Conditions

Values are starting recommendations. Adjust based on machine rigidity, coolant application, and workpiece condition. Use lower end for interrupted cuts or less rigid setups.

Operating Guidelines

• Coolant: Flood coolant recommended at 6–8% concentration for optimal chip evacuation and thermal management. Minimum flow rate 5 L/min directed at the cutting edge. For hard turning (PQ chipbreaker), consider minimum quantity lubrication (MQL) or dry cutting to avoid thermal shock.
• Tool Overhang: Keep tool overhang to minimum possible (≤4× shank diameter for boring bars). Excessive overhang promotes vibration and chatter marks, especially with larger 22mm inserts.
• Insert Seating: Clean toolholder pocket and insert seat thoroughly before mounting. Negative inserts require precise seating for both top and bottom surfaces. Use torque wrench for screw clamping (recommended 2.5–3.5 N·m).
• Edge Preparation: Do not touch the cutting edge with bare fingers. Oils and moisture can promote micro-chipping at high temperatures. Handle inserts with clean gloves or edge protectors.
• Wear Monitoring: Monitor for flank wear (VBmax = 0.3mm) and crater wear (KT = 0.15mm). Replace insert before catastrophic failure to protect workpiece surface. With 3 edges per side, index promptly when wear limits are reached.
• Speed Ramping: When starting a new batch, begin at 70% of recommended Vc and increase incrementally to find the stable operating window for your specific machine and setup. For PMG chipbreaker, optimal performance is typically achieved at 80–90% of max Vc.
• Index Strategy: As a double-sided negative insert, this tool offers 3×2 = 6 total cutting edges. Index systematically to maximize economy and maintain consistent tool life tracking.

Toolholder Compatibility

The TNMG220404PMG is compatible with standard MTJNR/L and PTJNR/L toolholders designed for triangle negative inserts with 22mm IC. The three cutting edges provide a balance between economy and versatility, making it one of the most popular insert shapes in CNC turning.

• Toolholder series: MTJNR, MTJNL, PTJNR, PTJNL
• Clamping: Lever type or top-clamp (double-sided)
• Insert seat angle: 0° negative
• Compatible shank sizes: 16×16mm, 20×20mm, 25×25mm, 32×32mm
• Max overhang for boring: 4× tool diameter

Packaging & Ordering Information

• Packaging: Each insert is individually sealed in anti-corrosion VCI (Volatile Corrosion Inhibitor) film and packed in Kyocera-branded plastic boxes of 10 inserts.
• Minimum Order: 10 inserts (1 box). Bulk pricing available for quantities of 50, 100, and 500 inserts.
• MPN: TML00495 — Use this manufacturer part number for precise ordering and inventory tracking.
• Batch Number: 26-3706 — Traceability code for quality control and warranty claims.
• Warranty: 12-month manufacturer warranty against material and coating defects under normal operating conditions.
• Storage: Store in original packaging at 15–25°C, humidity <60% RH. Avoid direct sunlight and contact with corrosive chemicals.

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