Manufacturer spec sheets contain a wealth of optimization data, but the format intimidates new machinists.
Anatomy of a Spec Sheet
- Insert designation and dimensions
- Material and ISO grade compatibility
- Cutting parameter recommendations
- Chip breaker selection guide
- Application notes
Section 1: Designation
The ISO code (CNMG 12 04 08-MM) tells you everything about geometry. See our complete ISO decoder.
Section 2: Material Compatibility
ISO color codes:
- P (blue) — Steel
- M (yellow) — Stainless
- K (red) — Cast iron
- N (green) — Non-ferrous
- S (brown) — Superalloy
- H (gray) — Hardened
Stars or fill bars: full = best, partial = OK, empty = avoid.
Section 3: Cutting Parameters
- Vc range — Cutting speed in m/min
- fn range — Feed per revolution in mm/rev
- ap range — Depth of cut in mm
Use middle of each range as starting point.
Section 4: Chip Breaker Codes
| Suffix | Operation |
|---|---|
| -F | Finishing — light, low force |
| -M | Medium — general-purpose |
| -R | Roughing — heavy, max MRR |
| -WMX, -PMX | Wiper — best surface finish |
Application Notes (Watch For)
- “Not for interrupted cuts” — avoid for fly cutting
- “Coolant required” — don’t use dry
- “Minimum DOC X mm” — below this, the insert rubs
- “Maximum tool overhang X” — vibration limit
Browse our insert catalog with real specs from Sandvik, Iscar, Walter.
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