TNMG 160412 / TNMG 333, chip breaker BR, grade FM2538 — negative triangular turning insert.
3/8" 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. FM2538 is a CVD grade — balanced productivity for continuous cuts — high wear resistance with improved toughness.
TURNING KNOW-HOW
Practical guides to choosing, understanding and using your inserts.
Explore the grade and chip-breaker selection chart for your turning operation.
Explore the chart 02 / INSERT CODESUnderstand turning-insert designations and what the letters and numbers mean.
Read the guide 03 / CUTTING PARAMETERSLearn how to use a turning formula calculator to work through the numbers.
Explore the formulas