PROON 85-4D — toolholder. Made in the USA by RMC Tooling.
Neutral Shank for Profiling RCMM Inserts.
Indexable turning toolholder from RMC Tooling, machined in the United States. The shank is ground to a qualified reference surface, so the tool goes back into the turret at the same cutting-point location every time it is swapped — no re-touching off, no lost setup.
Built for production lathes and CNC turning centers. The insert pocket, seat and clamping hardware are all standard RMC service parts, listed below, so the holder stays in service for years instead of being scrapped when a clamp screw strips.
These are the service parts RMC lists for this exact model — not a generic cross-reference. Every one is stocked.
| Insert | RCMM-43 |
| Seat / shim | RS-43P |
| Lock pin | PL-46 |
See all RMC spare parts & hardware →
Not sure how to read an insert code? Turning insert designation explained.
Dimensions as published in the RMC 2020 catalog, page 24.
