H28 MTHOR 5 — interchangeable head, 1.750" head diameter, 3.250" minimum bore. Made in the USA by RMC Tooling.
H-MTHOR/L Heads.
Interchangeable boring head from RMC Tooling, machined in the United States. The head mounts on a matching RMC bar, so one bar covers a whole family of geometries and you only buy the cutting end.
The retention system is not interchangeable between families: heads with a W suffix use SM-series seats with LP-series pins, and heads without it use ICSN/IDSN seats with NL-series pins. The exact parts for this head are listed below.
These are the service parts RMC lists for this exact model — not a generic cross-reference. Every one is stocked.
| Insert | TNMA-54NGL |
| Lock pin | NL-55 |
| Clamp | CL-20 |
| Clamp screw | STC-11 |
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 96.
