TNMG 220412 Chip Breaker BR Grade FM324 / TNMG 433 BR #FMCarbide

TNMG 220412 / TNMG 433, chip breaker BR, grade FM324 — negative triangular turning insert.

1/2" inscribed circle, 3/16" thick, 3/64" corner radius. The BR breaker is the roughing geometry: 0.012–0.024 ipr (0.3–0.6 mm/rev) at 0.08–0.24" (2–6 mm) depth of cut. FM324 is a PVD grade — universal multi-purpose grade for mid and low cutting speeds — low-carbon and alloyed steel, stainless, cast iron, Inconel and titanium alloys.

Specifications

• Insert designation (ISO): TNMG 220412
• Insert designation (inch): TNMG 433
• Insert shape: triangular (T)
• Clearance angle: 0° — negative (N)
• Tolerance class: M
• Insert type: G — with hole, chipbreaker both sides
• Inscribed circle (I.C.): 1/2" (12.7 mm)
• Thickness: 3/16" (4.76 mm)
• Corner radius: 3/64" (1.19 mm)
• Chip breaker: BR — Steel — roughing
• Feed rate range: 0.012–0.024 ipr (0.3–0.6 mm/rev)
• Depth of cut range: 0.08–0.24" (2–6 mm)
• Grade: FM324
• Coating: PVD
• ISO application range: P10–P30 · M05–M25 · S05–S25 · H20–H40
• Cutting speed, non-alloy steel: 390–820 SFM (120–250 m/min)
• Cutting speed, low-alloy steel: 230–750 SFM (70–230 m/min)
• Cutting speed, high-alloy steel: 230–590 SFM (70–180 m/min)
• Cutting speed, ferritic & martensitic stainless: 200–590 SFM (60–180 m/min)
• Cutting speed, austenitic stainless: 200–490 SFM (60–150 m/min)
• Cutting speed, grey cast iron: 200–520 SFM (60–160 m/min)
• Cutting speed, nodular cast iron: 200–390 SFM (60–120 m/min)
• Cutting speed, titanium & super-alloys: 110–200 SFM (35–60 m/min)
• Cutting speed, hardened material: 130–260 SFM (40–80 m/min)

Tool holders that accept this insert

122 RMC toolholders in stock take this insert — triangular, 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. 76 more RMC tools take the same insert for internal turning. See RMC boring bars →

TURNING KNOW-HOW

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Practical guides to choosing, understanding and using your inserts.

01 / SELECTION

Grades & chip breakers

Explore the grade and chip-breaker selection chart for your turning operation.

Explore the chart → 02 / INSERT CODES

Know your insert

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Read the guide → 03 / CUTTING PARAMETERS

Turning calculations

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