H40 DVUNR 4W — interchangeable head, 2.500" head diameter, 3.250" minimum bore. Made in the USA by RMC Tooling.
H-DVUNR/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 | VNMG-432 — 1/2" I.C. · 3/16" thick · 1/32" nose radius |
| Seat / shim | SM-386 |
| Lock pin | LP-55 — Cam Pin |
| Clamp | CL-30 |
| Clamp screw | STC-4 |
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 92.
