H40 NER 3W — interchangeable head, 2.500" head diameter, 3.000" minimum bore. Made in the USA by RMC Tooling.
H-NDXPR/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. Availability of replacement parts varies by item.
| Insert | NG-3L |
| Clamp (left hand) | CM-73 |
| Clamp screw | S-412 |
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 100.
RMC toolholder availability varies. When replenishment is required, estimated time to ship is 4–6 weeks. Please contact us for availability of this item.
Estimated time to ship is measured in calendar days, from order placement until your order is handed to the carrier. Carrier transit time is additional. Orders may ship sooner. We accept orders awaiting replenishment; please contact us before ordering if you need a specific shipping date.
See our Shipping Policy for details.
