VCMT 160404 Chip Breaker BFF Grade FM324 / VCMT 331 BFF #FMCarbide

VCMT 160404 / VCMT 331, chip breaker BFF, grade FM324 — positive 35° rhombic turning insert.

3/8" inscribed circle, 3/16" thick, 1/64" corner radius. 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): VCMT 160404
• Insert designation (inch): VCMT 331
• Insert shape: 35° rhombic (V)
• Clearance angle: 7° (C)
• Tolerance class: M
• Insert type: T — with hole, countersunk one side, chipbreaker one side
• Inscribed circle (I.C.): 3/8" (9.52 mm)
• Thickness: 3/16" (4.76 mm)
• Corner radius: 1/64" (0.4 mm)
• Chip breaker: BFF
• 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

7 RMC toolholders in stock take this insert — 35° rhombic, 7° clearance, 3/8" 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. 3 more RMC tools take the same insert for internal turning. See RMC boring bars →

TURNING KNOW-HOW

Get more from your turning inserts.

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

Understand turning-insert designations and what the letters and numbers mean.

Read the guide → 03 / CUTTING PARAMETERS

Turning calculations

Learn how to use a turning formula calculator to work through the numbers.

Explore the formulas →