CNMG090408HQ CA025P TMH00089

Product Overview

The CNMG090408HQ is a 80° rhombic 0° clearance indexable carbide insert manufactured by Kyocera. Engineered for heavy roughing, this insert features a slightly rounded cutting edge and optimized chipbreaker geometry to deliver consistent performance across high-volume CNC turning operations.

ISO Designation Breakdown

• C – 80° Rhombic insert shape (ISO standard)
• N – 0° clearance angle (negative type)
• M – M-class (±0.05–0.15 mm)
• G – With hole, chipbreaker on one side
• 09 – Nominal cutting edge length 09 mm
• 04 – Insert thickness 4.76 mm
• 08 – Corner radius 0.8 mm
• HQ – Heavy Duty chipbreaker profile

Engineering Dimensions & Geometry

Shape: 80° Rhombic | Clearance: 0° | Inscribed circle (nominal): 09 mm | Thickness: 4.76 mm | Corner radius: 0.8 mm. The negative design seats securely in compatible toolholders with minimal rake interference.

Grade Details - Key Grade Characteristics

Grade CA025P is a CVD TiAlN-based coated sub-micron substrate. It delivers exceptional crater and flank wear resistance in continuous to lightly interrupted cuts. The CVD architecture provides thermal stability at elevated cutting temperatures typical of high-speed steel machining.

Grade Comparison Matrix

CA025P sits in the P15–P30 application range for steel machining. Compared to uncoated grades, it offers 3–5× longer tool life in continuous cutting. Relative to harder PVD grades, CA025P provides superior thermal crack resistance, making it preferable for wet machining and variable depths of cut. It is the recommended Kyocera grade for medium-to-roughing steel operations where reliability outweighs absolute speed.

Chipbreaker Profile

Heavy Duty — Robust chipbreaker for high-load roughing operations. Strong cutting edge withstands interrupted cuts and heavy depths. Recommended depth of cut: 2.0–6.0 mm; Feed range: 0.25–0.60 mm/rev. The groove geometry promotes tight chip curl and controlled breakage, reducing the risk of chip entanglement around the workpiece or toolholder.

Recommended Applications & Workpiece Materials

Carbon steel (C45, C60), alloy steel (4140, 4340), tool steel, stainless steel (304, 316, 420), and cast iron (GG25, GGG40). Especially suited for forged steel, castings, and heat-treated alloys up to 45 HRC.

Application Map by Operation

Primary: external turning, facing, straight profiling. Secondary: taper turning, shoulder facing, and bore turning (when used on boring bars). Heavy Duty geometry is optimized for heavy roughing passes where surface integrity and dimensional stability are critical.

Recommended Cutting Conditions

Cutting speed (Vc): 100–200 m/min | Feed (f): 0.25–0.60 mm/rev | Depth of cut (ap): 2.0–6.0 mm. Start at the lower end of the speed range for interrupted cuts or work-hardening materials (e.g., 316 stainless). Increase feed within the wiper range for improved productivity when surface finish is not the primary constraint.

Operating Guidelines

• Ensure toolholder seat is clean and free of burrs before indexing.
• Use adequate coolant flow (minimum 4–6 bar) for steel and stainless steel to control built-up edge.
• Maintain rigid workpiece clamping; slender parts may require reduced depth of cut.
• Inspect corner radius after each index; replace when flank wear exceeds 0.3 mm or chipping appears.
• For cast iron, dry machining is acceptable; for steel, emulsion coolant at 6–8% concentration is recommended.

Toolholder Compatibility

MCLNR / MCLNL (80° rhombic, 0° clearance) shank sizes: 20x20 mm or 25x25 mm. Ensure the toolholder clamping mechanism matches the insert hole pattern (G-type) and that the seat angle matches the 0° clearance of this insert.

Packaging & Ordering Information

Supplied in sealed Kyocera industrial packaging (10 inserts per pack standard). Manufacturer order reference: TMH00089. Price displayed is per insert. Bulk and institutional pricing available on request. All products are genuine OEM items backed by Kyocera's full manufacturer warranty.

Catalog Meta Data

Brand: Kyocera | Grade: CA025P | ISO Code: CNMG090408HQ | MPN: TMH00089 | Coating: CVD TiAlN-based | Substrate: sub-micron | Standard: ISO 1832 | Application Group: P15–P30 (Steel) | Insert Type: Negative | Geometry: Heavy Duty | Corner Radius: 0.8 mm.