OSCARBIDE Carbide Turning Inserts CCMT060204(CCMT21.51) CCMT Insert Mutilayer Coated CNC Lathe Inserts for Lathe Turning Tool Holder Cut Off Tools, 10 Pieces

Materials tested on thus far: aluminum, cast iron, cold roll steel and as an acid-test: Thompson shaft. Excellent finish on the CRS with higher RPM and aggressive depth of cut. Aluminum and cast iron finish is fair and certainly useable. It cuts through all of these like a hot knife through butter. While I would not try to use these to machine hardened shafting on a regular basis, it WILL cut through the outside skin on the Thompson shaft and was able to expose the softer interior for a needed threading operation. As a point of reference, cheaper carbide was not up to this task and HSS blunts instantly on this hardened shaft. I will buy this again. Photos are of a gnarly chunk of reclaimed steel I cleaned up for use in a project. You can see the quality of the finish on these: 2 diameter, roughly 400 RPM for both roughing pass and finish pass.

These are great cutters for the money Perfect fit

Good product

I use these bits a lot - especially turning on hot rolled steel. They produce a surprisingly good finish compared to other carbide inserts but (of course) not as smooth as you can get from a sharp HSS turning bit - but close.

Exactly what I was looking for

They cut great!

I have used a few different styles of OSCARBIDE inserts and have no complaints. I only machine aluminum, so I can’t vouch for use on any other materials, but for a hobby machinist these seem to be a great product for the money.

Nice last a while

100% satisfied!

I figured it out they work