Machinability
Controlled sulfur provides improved chip breaking for automatic screw-machine operations.
Free-machining nickel-copper alloy
Monel R-405 Round Bar and Screw-Machine Stock
The free-machining version of Monel 400, developed mainly for automatic screw-machine stock and small precision-machined components.
Representative product-form image. Confirm actual surface, dimensions and condition with the quotation.Material overview
Why industrial buyers specify Monel R-405
Monel R-405 has essentially the same nickel-copper base and corrosion behavior as Monel 400, with controlled higher sulfur to improve chip breaking and machinability. It is chiefly supplied as bar or screw-machine stock and is generally not recommended as a universal substitute for other product forms.
Corrosion resistance
Corrosion and physical properties are broadly similar to Monel 400.
Purpose-specific supply
Primarily intended for bar and automatic screw-machine stock rather than broad fabrication use.
Technical reference
Composition and purchasing data
Values below are published reference limits. The purchase order, applicable specification and mill test certificate control the supplied material.
Limiting chemical composition, weight %
| Element | Published limit |
|---|---|
| Nickel + cobalt | 63.0 min |
| Copper | 28.0-34.0 |
| Iron | 2.5 max |
| Manganese | 2.0 max |
| Carbon | 0.30 max |
| Silicon | 0.50 max |
| Sulfur | 0.025-0.060 |
Key material facts
- Designation
- UNS N04405; UNS N04405
- Density
- 8.80 g/cm3
- Strengthening
- Solid-solution alloy; supplied in machining conditions rather than precipitation hardened.
- Temperature note
- Service temperature must be evaluated for the machined component, environment, loading and governing specification.
- Common supply
- Round bar, hexagonal bar and automatic screw-machine stock by inquiry
Technical reference: manufacturer technical bulletin. Typical data is for material selection only and is not a design guarantee.
Common specifications
Standards buyers frequently reference
Specification editions and permitted product forms change. Send the exact standard, revision and condition shown on your drawing or material list.
| Product or requirement | Common reference |
|---|---|
| Rod and bar | ASTM B164 |
| Screw-machine stock | Buyer drawing and machining condition to be confirmed |
| Certification | UNS N04405 chemistry and applicable test requirements |
| Order requirements | Diameter, tolerance, straightness and surface finish to be specified |
Availability is subject to grade, size, quantity, condition, certification and mill route. No standard listed here confirms stock.
Application areas
Where Monel R-405 is commonly evaluated
Final material selection belongs to the buyer's qualified engineer and must consider temperature, stress, fabrication, corrosion medium and governing code.
Automatic machining
Screw-machine parts requiring dependable chip control.
Fittings
Small fittings and threaded nickel-copper components.
Fasteners
Machined nuts, bolts and specialty fasteners.
Precision components
Small turned parts used in marine, chemical and industrial assemblies.
RFQ checklist
Information needed for an accurate quotation
Clear specifications shorten material matching and reduce repeated email clarification.
1. Grade and standard
Monel R-405, UNS N04405, ASTM/AMS/EN standard and required revision.
2. Product and dimensions
Round bar, hexagonal bar and automatic screw-machine stock by inquiry. Include thickness, width, length, diameter and tolerances.
3. Condition
Machining stock condition with diameter, tolerance, straightness and surface requirements stated on the RFQ
4. Quantity
Pieces, kilograms or total project quantity, plus any trial-order requirement.
5. Inspection
MTC type, chemistry, mechanical tests, NDT, dimensional report and third-party inspection.
6. Delivery
Destination country or port, required date, packing and Incoterm preference.
Fast alloy inquiry
Send your Monel R-405 size, quantity and destination.
We will review product form, specification, condition, certification and delivery requirements before preparing a targeted quotation.
Buyer questions
Monel R-405 FAQ
Quick answers for initial sourcing. Confirm critical engineering requirements against the governing specification.
How is Monel R-405 different from Monel 400?
R-405 contains controlled higher sulfur for improved chip breaking and machinability, while retaining broadly similar corrosion and physical properties.
Can R-405 replace Monel 400 plate or sheet?
It is chiefly intended for automatic screw-machine stock and is generally not recommended as a universal replacement for other Monel 400 product forms.
What should an R-405 RFQ include?
Include bar shape, diameter or across-flats size, length, tolerance, condition, quantity, surface finish, testing and destination.
Related grades
Compare other core alloy pages
Use related pages to compare alloy families before sending your final material requirement.