Insert code decoder
Type an ISO insert code, metric or inch, to see what every letter and number means, plus the matching Korloy inserts we supply.
How ISO insert codes work
Most turning and milling inserts follow ISO 1832, so the first part of the code means the same thing whichever brand made it.
- Shape, for example C for an 80° diamond or T for a triangle.
- Clearance angle: N is 0° (a negative insert you can flip over), C is 7°.
- Tolerance: M is a moulded general-purpose insert, G is ground.
- Hole and chipbreaker, which decides how it clamps in the holder.
- Size, the cutting edge length in mm.
- Thickness code.
- Corner radius in tenths of a millimetre, so 08 is 0.8 mm.
Anything after that, like a chipbreaker or grade, is the maker’s own code. Have one from another brand? Use the cross-reference.
Want it on the wall? Print our insert and holder codes chart (A3 PDF).
A guide only. These tools and figures are general starting points, not a guarantee for your job. Results depend on your machine, setup, material and tooling, so always check against the tool maker’s data, and talk to a Teravin sales engineer to make sure it’s right for your application. Call +61 8 9345 2099 or ask us. See our terms of use.
