Kyocera TNMG220408 CA315 TMD06401

Product Overview

The TNMG220408 from Kyocera is a premium-grade triangular negative turning insert designed for external turning & boring. Featuring the advanced CA315 PVD-coated carbide substrate, this insert delivers high-precision machining with extended tool life in demanding production environments. Every edge is precision-ground to ISO tolerances, ensuring repeatable performance across high-volume CNC operations.

Whether you are machining carbon steel, alloy steel, stainless steel, or cast iron, the TNMG220408 offers the ideal balance of wear resistance, thermal stability, and chip control. Its optimized geometry reduces cutting forces, minimizes vibration, and extends tool life—translating directly to lower cost-per-part and higher machine uptime.

ISO Designation Breakdown

The TNMG220408 follows the ISO 1832 standard for indexable insert identification. Each character in the designation conveys critical geometric and functional information:

Engineering Dimensions & Geometry

All dimensions are manufactured to ISO 1832 tolerances and verified via CMM inspection:

Key Geometric Features:

• Precision-ground peripheral edges for consistent cutting action
• Optimized rake angle for reduced cutting forces and improved chip flow
• Polished flank surfaces to minimize friction and built-up edge formation
• Standardized hole pattern for universal toolholder compatibility

Grade Details – Key Grade Characteristics

The CA315 grade is engineered for modern machining demands where speed, precision, and reliability intersect:

• Substrate: Micro-grain carbide with PVD coating
• Coating: TiAlN-based PVD multilayer
• Hardness: HRA 92.5
• Primary Applications: Steel, Stainless Steel, Cast Iron
• Speed Range: 80–250 m/min
• Feed Range: 0.1–0.4 mm/rev
• Key Characteristics: Excellent wear resistance and thermal stability. Ideal for continuous and light interrupted cuts.

Grade Comparison Matrix

Selecting the right grade ensures optimal performance and cost efficiency. The CA315 grade is highlighted for quick reference:

Chipbreaker Profile

Standard double-sided chipbreaker for medium to roughing operations

The chipbreaker geometry is designed to curl and break chips into manageable lengths, preventing bird-nesting and improving operator safety. The controlled chip flow also reduces heat buildup at the cutting edge, extending insert life and maintaining surface finish quality.

Recommended Applications & Workpiece Materials

The TNMG220408 excels across a broad spectrum of materials and operations:

• Carbon Steel (C45, C60): Excellent wear resistance and predictable tool life.
• Alloy Steel (4140, 4340): Stable performance under moderate to high cutting loads.
• Stainless Steel (304, 316): Reduced built-up edge with proper coolant strategy.
• Cast Iron (GG25, GGG40): Good abrasion resistance and thermal shock tolerance.
• Tool Steel (H13, D2): Suitable for pre-hardened material machining at reduced speeds.

Application Map by Operation

Understand where the TNMG220408 performs best within your machining workflow:

Recommended Cutting Conditions

These parameters serve as starting points. Always optimize based on machine rigidity, workpiece condition, and coolant delivery:

Note: Values are guidelines for stable, continuous cuts. Reduce Vc by 20% for interrupted cutting or hard materials.

Operating Guidelines

• Always use adequate coolant flow for CA315 grade to maximize coating life and prevent thermal cracking.
• Verify toolholder clamping force before operation; insufficient clamping causes vibration and premature wear.
• Start at the lower end of the recommended cutting speed range and increase gradually based on chip formation.
• For stainless steel applications, use high-pressure coolant to avoid built-up edge (BUE).
• Inspect insert edges after every 30 minutes of continuous cutting for flank wear or chipping.
• Store inserts in original packaging away from moisture and direct sunlight to prevent corrosion.

Toolholder Compatibility

The TNMG220408 is compatible with a wide range of standard ISO toolholders. Recommended clamping systems include:

• External Turning: MTJNR/L, MTENN/L, STGCR/L (external); S16Q-MTJNR11, S20R-MTJNR16 (boring)
• Internal Boring: Corresponding boring bars with matching insert size
• Clamping Style: Lever-lock or screw-clamp (depending on toolholder design)
• Insert Seat Angle: Positive for reduced cutting forces

Ensure toolholder seat and chipbreaker orientation match to avoid premature failure.

Packaging & Ordering Information

Packaged in Kyocera original anti-corrosion blister packs. 10 inserts per pack. OEM sealed.

• MPN: TMD06401
• Minimum Order: 1 pack (10 inserts)
• Lead Time: In-stock items ship within 24 hours
• Unit Price: $7.80 USD per insert
• Bulk Pricing: Available for quantities above 100 inserts

Catalog Meta Data

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