SNMG 120408 Chip Breaker BR Grade FM2553 / SNMG 432 BR #FMCarbide

SNMG 120408 Chip Breaker BR Grade FM2553 / SNMG 432 BR #FMCarbide

Turning Insert
$7.80 per insert$78.00 per box of 10
Grade
Chip Breaker
Item #

Sold in boxes of 10 inserts. Prices are shown per insert. Minimum order: 10 inserts. Order in multiples of 10.

Quantity (inserts)
- +

10 inserts = 1 box · 20 inserts = 2 boxes

SNMG 120408 / SNMG 432, chip breaker BR, grade FM2553 — negative square turning insert.

1/2" inscribed circle, 3/16" thick, 1/32" 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. FM2553 is a CVD (Al₂O₃) grade — tough substrate for heavy interrupted cuts in steel and stainless, heavy roughing in mild steel, and first choice for superalloys.

Specifications

  • Insert designation (ISO): SNMG 120408
  • Insert designation (inch): SNMG 432
  • Insert shape: square (S)
  • 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: 1/32" (0.79 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: FM2553
  • Coating: CVD (Al₂O₃)
  • ISO application range: P20–P35 · M10–M30
  • Cutting speed, non-alloy steel: 490–1150 SFM (150–350 m/min)
  • Cutting speed, low-alloy steel: 300–980 SFM (90–300 m/min)
  • Cutting speed, high-alloy steel: 230–820 SFM (70–250 m/min)
  • Cutting speed, ferritic & martensitic stainless: 390–750 SFM (120–230 m/min)
  • Cutting speed, austenitic stainless: 260–660 SFM (80–200 m/min)
  • Cutting speed, titanium & super-alloys: 110–260 SFM (35–80 m/min)

Tool holders that accept this insert

42 RMC toolholders in stock take this insert — square, 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

5/8" shank MSDNN 10-4B
3/4" shank MSDNN 12-4B · MSDNN 12-4C · MSKNL 12-4B · MSKNR 12-4B · MSRNL 12-4B · MSRNL 12-4C · MSRNR 12-4B · MSSNL 12-4B · MSSNR 12-4B · SBL 12-4 · SBR 12-4
1" shank MSDNN 16-4D · MSKNL 16-4D · MSKNR 16-4D · MSRNL 16-4D · MSRNR 16-4D · MSSNL 16-4D · MSSNR 16-4D · SBL 16-4 · SBR 16-4
1-1/4" shank MSDNN 20-4D · MSDNN 20-4E · MSKNL 20-4D · MSKNL 20-4E · MSKNR 20-4D · MSKNR 20-4E · MSRNL 20-4D · MSRNR 20-4D · MSSNL 20-4D · MSSNL 20-4E · MSSNR 20-4D · MSSNR 20-4E
1-1/2" shank MSDNN 24-4D · MSDNN 24-4E
1" x 1-1/4" shank MSDNN 85-4D · MSKNL 85-4D · MSKNR 85-4D · MSRNL 85-4D · MSRNR 85-4D · MSSNL 85-4D · MSSNR 85-4D

Boring bars and interchangeable heads. 16 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

Availability and Shipping

FM Carbide maintains stock in the USA. If this item is not in stock, estimated time to ship is 14–21 calendar days.

Estimated time to ship is measured in calendar days, from order placement until your order is handed to the carrier. Carrier transit time is additional. Orders may ship sooner. We accept orders awaiting replenishment; please contact us before ordering if you need a specific shipping date.

See our Shipping Policy for details.

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