CNMA 120404 / CNMA 431, grade FM2533 — negative 80° rhombic turning insert.
1/2" inscribed circle, 3/16" thick, 1/64" corner radius. FM2533 is a CVD grade — stable steel applications and nodular cast iron — a balance of wear resistance and chipping resistance.
Specifications
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Insert designation (ISO): CNMA 120404
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Insert designation (inch): CNMA 431
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Insert shape: 80° rhombic (C)
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Clearance angle: 0° — negative (N)
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Tolerance class: M
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Insert type: A — with hole, no chipbreaker
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Inscribed circle (I.C.): 1/2" (12.7 mm)
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Thickness: 3/16" (4.76 mm)
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Corner radius: 1/64" (0.4 mm)
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Grade: FM2533
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Coating: CVD
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ISO application range: P05–P20 · K15–K35
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Cutting speed, non-alloy steel: 560–1480 SFM (170–450 m/min)
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Cutting speed, low-alloy steel: 590–1250 SFM (180–380 m/min)
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Cutting speed, high-alloy steel: 330–1080 SFM (100–330 m/min)
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Cutting speed, grey cast iron: 390–980 SFM (120–300 m/min)
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Cutting speed, nodular cast iron: 390–920 SFM (120–280 m/min)
Tool holders that accept this insert
69 RMC toolholders in stock take this insert — 80° rhombic, 0° — negative clearance, 1/2" inscribed circle, 3/16" thick. Pick by the shank your turret takes.
RMC square-shank toolholders — made in the USA
Boring bars and interchangeable heads. 66 more RMC tools take the same insert for internal turning. See RMC boring bars →
Grade & chip breaker selection chart →
Turning insert designations explained · Using a turning formula calculator
