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Kyocera CNMG120412CQ CJ225P
The Kyocera CNMG120412CQ CJ225P is a high-performance finishing / medium finishing insert designed for turning steel and forging materials. With its 80° rhombic negative geometry and CQ chipbreaker, it delivers stable chips, excellent surface finishes, and reduced tool changes. Using CJ225P, a tough universal grade with a CVD coating, it provides outstanding wear resistance in demanding conditions.
"Slash your downtime and cost per component — with Kyocera CNMG120412CQ CJ225P, you get longer tool life and superior finish even under tough steel & forging work."
When precision, efficiency & cost control matter, the Kyocera CNMG120412CQ CJ225P gives you all three. This carbide insert features the CQ chipbreaker for well-controlled chip flow, particularly during finishing to medium finishing operations in steels & forgings. The 80° rhombic negative geometry ensures strong cutting edges, allowing relatively high feed rates with stable performance.
The CJ225P grade is CVD-coated carbide, optimized for toughness and wear resistance specifically in steel and forged materials. It handles moderate interruptions well and resists edge chipping and flank wear, so you spend less time changing inserts and more time producing accurate, high-quality parts. Its larger inscribed circle (≈12-70 mm) and robust thickness make it suitable for heavier duty operations, while the CQ chipbreaker helps ensure smoother surface finishes—less polishing, less rework.
Industries such as automotive component makers, forging shops, die & mold finishing, general engineering, and steel-fabrication will appreciate the durability and cost savings this insert brings. CNC Tools Depot stocks original Kyocera inserts with full traceability and bulk-order availability. Whether you need 10 pieces or hundreds, we can supply.
Key Features
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Geometry: CNMG 120412CQ — 80° rhombic, negative-insert, hole & chipbreaker type CQ for finishing / medium-finishing cuts.
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Grade / Coating: CJ225P — Kyocera’s CVD-coated carbide universal grade with excellent toughness & wear resistance especially in steel & forging.
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Size / Corner Radius: 12-mm inscribed circle, 0.12 mm / 0.8 mm / etc depending on variant (120412 implies 12.70 mm I.C., ~4.76 mm thickness).
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Cutting Applications: Best for turning operations — finishing to medium finishing of alloy & carbon steels, forgings; also works in interrupted cuts, stable feeds & depths.
Why It’s a Best Seller
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Less frequent insert changes = more uptime on the machine.
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The CQ chipbreaker gives controlled chip formation, meaning smoother surface finishes and less rework.
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The CJ225P grade resists flank wear & edge chipping under steel loads & forging work, so cutting edge lasts longer.
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Consistent performance reduces scrap and improves parts accuracy.
Applications
Automotive (shafts, pins, components), Forging, General Engineering, Heavy Equipment, Die & Mold finishing, Steel fabrication.
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Frequently Asked Questions
It excels in carbon steel, alloy steel, and forged steel, especially when finishing or medium finishing is required. It can also handle some interrupted cuts if conditions are stable.
CQ is Kyocera’s design for good chip control during finishing/medium finishing operations. It helps produce consistent chips, smoother surfaces, and prevents issues like built-up edge or poor finish.
While exact values depend on your machine, material, rigidity, and coolant, typical finishing parameters for steel might be moderate depths of cut, lighter feeds and use of coolant to maintain edge integrity. The insert’s geometry + grade allow pushing modest feeds without sacrificing finish.
CJ225P offers a balance between toughness and wear resistance, which makes it more forgiving under unstable conditions than very hard, wear-oriented grades. Also better finish than roughing grades.
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CNMG style inserts typically provide 4 usable cutting edges (since it’s negative with hole, can be flipped / rotated). Tool life depends on your application (material hardness, cutting conditions etc.), but many shops report significantly longer runs vs generic inserts due to reduced wear & fewer failures.
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