Insert, TPGH-32.51 Carbide

The 60° triangle with 11° relief cut through my stainless steel like butter, and the single-sided chip breaker kept the mess to a minimum. It’s a bit pricier than some others, but the precision is worth it for my setup.

Installed these on my lathe yesterday for a finish pass on some mild steel; the chip breaker cleared chips nicely without buildup. The 3/8" IC fit my tool holder perfectly.

Ground a batch of 4140 with these TPGH-32.51 inserts and the single-sided chip breaker cleared chips better than expected. The 11° relief angle worked nicely on my tool holder without any fitment issues.