Install these inserts in an S-code holder (sold separately) to cut precise threads inside your workpiece. They’re designed to sit lower in the holder than other inserts, which keeps them from twisting and lets you thread closer to a shoulder. Their PVD coating keeps them sharper longer than CVD-coated inserts, so they’re good for cutting stainless steel. You can also use them to cut non-ferrous metals.

Inserts sold individually come packed in a clear plastic case to protect cutting edges during shipment. Inserts sold in packs come factory sealed from the manufacturer for maximum traceability.

Pair these holders with a laydown carbide insert (sold separately) to cut threads on the outside of a workpiece. Inserts sit lower in these K-code holders than in other types of holders, which lets you thread closer to a shoulder. A clamp holds the insert firmly in place to prevent twisting and create precise threads. Fit these holders directly into a lathe tool post or holder—no tool block needed. They’re also known as indexable insert holders. They cut in a right-hand direction, meaning the holder moves from right to left toward the lathe chuck.