Kyocera TNMG160408PG CA115P TML00042 Steel Finishing

Product Overview

The TNMG160408PG is a 60° triangular negative insert manufactured by Kyocera under grade CA115P. Featuring an 16.0mm (Inscribed Circle) inscribed circle, 4.76mm thickness, and a 0.8mm nose radius, this indexable carbide insert is engineered for high-precision CNC turning operations. The PG – Precision Finishing geometry ensures controlled chip formation and superior surface finish across a range of steel workpiece materials. With MPN TML00042, this insert is a genuine OEM component backed by full manufacturer specifications.

ISO Designation Breakdown

The model code TNMG160408PG follows ISO 1832 nomenclature for indexable inserts:

• T — Triangular insert shape with 60° included angle
• N — 0° clearance angle (negative basic insert, requires negative holder rake)
• M — Tolerance class ±0.05mm (inscribed circle), ±0.08mm (thickness), ±0.13mm (hole location)
• G — Cylindrical hole with countersink (40°–60° chamfer) for pin or screw clamping
• 16 — 16.0mm (Inscribed Circle)
• 04 — 4.76mm nominal thickness
• 08 — 0.8mm corner nose radius
• PG — PG – Precision Finishing chipbreaker code

Engineering Dimensions & Geometry

Grade Details — Key Grade Characteristics

Grade CA115P is a CVD-coated carbide grade developed specifically for steel machining in the ISO P15 application zone. The substrate consists of a fine-grained tungsten carbide (WC-Co) with a cobalt content optimized for hardness and toughness balance. The multi-layer CVD coating architecture typically includes:

• TiCN base layer — Provides adhesion strength and resistance to plastic deformation at high temperatures
• Al₂O₃ middle layer — Offers thermal barrier protection and chemical stability during high-speed cutting
• TiN top layer — Gold-colored identification layer that reduces friction and improves wear detection

The "P" suffix in CA115P denotes a premium micro-grain substrate with enhanced edge integrity, making it particularly suitable for precision finishing where edge chipping must be minimized. The grade exhibits excellent flank wear resistance and crater wear stability under continuous cutting conditions.

Grade Comparison Matrix

How CA115P compares to adjacent grades in the Kyocera steel-turning portfolio:

Chipbreaker Profile

PG – Precision Finishing

The PG chipbreaker features a sharp, positive rake face with a narrow, precision-ground groove optimized for minimal cutting forces and exceptional surface finish. It is designed for continuous, light-depth finishing passes where chip evacuation is unobstructed.

Key chipbreaker characteristics:

• Rake angle: Optimized positive rake for low cutting forces and minimal burr formation
• Groove width: Narrow precision groove suited to 0.8mm nose radius and fine feeds
• Chip control: Produces short, curled chips (C-type or 6-type) that evacuate safely without scratching the finished surface
• Edge preparation: Micro-honed T-land (0.02–0.05mm) for edge stability without sacrificing sharpness

Recommended Applications & Workpiece Materials

Ideal for finish turning and semi-finish turning of plain carbon steels, alloy steels, and bearing steels. Excels in continuous cutting conditions where surface quality is paramount.

Compatible materials: Carbon steels (C45, C50), alloy steels (4140, 4340), bearing steels (GCr15), and general structural steels up to 35 HRC.

• Plain carbon steels: SAE 1010–1060, DIN C15–C60
• Low-alloy steels: 4130, 4140, 5120, 8620 (annealed or normalized)
• Bearing steels: 52100, SUJ2, 100Cr6
• Tool steels: H13, D2 (in soft condition, pre-hardened ≤ 32 HRC)

Application Map by Operation

External cylindrical finishing, shoulder facing, smooth contour turning, and precision bore finishing on rigid CNC lathes.

Recommended Cutting Conditions

Starting parameters for CA115P with TNMG160408PG on carbon and alloy steels (dry or wet):

Operating Guidelines

• Machine Rigidity: Use on CNC lathes with minimum spindle runout ≤ 0.01mm. Ensure toolholder overhang is ≤ 4× holder diameter for boring bars.
• Coolant Strategy: Flood coolant recommended for extended tool life and surface finish enhancement.
• Entry Strategy: Use radial or oblique entry to avoid full-depth plunge. Ramp-in at 45° for facing operations.
• Exit Strategy: Reduce feed by 30% in the last 2mm of cut to prevent exit burr and edge micro-chipping.
• Edge Inspection: Check for uniform flank wear (VB ≤ 0.15mm) or crater wear (KT ≤ 0.10mm) before re-indexing. Replace insert if chipping exceeds 0.05mm.
• Workpiece Preparation: Ensure straightness and minimal runout. Cast or forged skins should be removed with a roughing grade before finish passes with TNMG160408PG.

Toolholder Compatibility

The TNMG160408PG is a negative insert with 0° clearance and requires a negative-rake toolholder. Compatible holder families include:

• MTJNR, MTGNR, STGCR (90°–93° toolholders)
• Clamp type: Lever or pin-lock clamping
• Insert seat angle: Must match 60° negative geometry
• Shim requirement: Use original Kyocera shim seat (part numbers vary by holder series) to prevent seat deformation and ensure accurate height alignment

Verify holder compatibility using the Kyocera Tooling Systems catalog or contact our technical support team with your machine spindle and turret specifications.

Packaging & Ordering Information

• Manufacturer Part Number (MPN): TML00042
• Packaging: Genuine Kyocera industrial packaging with holographic authenticity seal. Each insert is laser-marked with grade and model code.
• Minimum Order: Sold individually or in bulk packs (10 inserts per pack). Contact us for volume pricing on 50+ inserts.
• Authenticity: All inserts are sourced directly from Kyocera Corporation, Japan. Verify authenticity via the laser-etched batch code on each insert face.
• Price: $6.1 USD per insert (subject to volume discounts)

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