Monel 400
Fasteners & Material Data
UNS N04400 · W.Nr. 2.4360 / 2.4361
What is Monel 400 and its applications?
Monel 400 (UNS N04400) is a nickel-copper solid-solution alloy. It is used in marine fixtures, valves, pumps, process vessels and heat exchangers.
- Marine equipment: Fixtures, fasteners, pump and propeller components.
- Chemical processing: Piping, valves and process vessels.
- Heat transfer: Feedwater heaters and other heat exchangers.
Choose your 400 product
Engineering Application & Selection Guide
Cold working can increase its strength; it is not precipitation hardened like K-500. Condition and processing therefore belong in the fastener specification. Magnetic behavior can vary between heats near room temperature.
- Monel 400 hex bolts — For seawater piping, consider flow, fouling and stagnation at the joint.
- Monel 400 stud bolts — For chemical flanges, specify the exact medium and assess whether stress-relief requirements apply to the proposed route.
- Monel 400 socket head cap screws — For low-temperature assemblies, check specified strength and toughness requirements for the actual condition.
Compare 400 and K-500 for a strength-led alternative, then reassess environmental cracking and the final condition. K-500 is not an automatic upgrade in corrosion or galling resistance, nor does it supply a universal strength multiple.
Monel 400 Composition
Composition limits · wt.%
- Ni
- ≥63%
- Cu
- 28–34%
- Fe
- ≤2.5%
- C
- ≤0.30%
- Mn
- ≤2.0%
- S
- ≤0.024%
- Si
- ≤0.50%
ASTM / ASME specifications by product form
Finished-product requirements
Specify the finished-fastener mechanical requirements, condition and inspection separately from the starting-stock specification.
Monel 400 hex bolt requirements ↗Fasteners · dimensional references
| Product | Reference |
|---|---|
| Hex bolts | ISO 4014 / ISO 4017 · ASME B18.2.1 |
| Threaded studs | DIN 976-1 · ASME B18.31.2 |
| Hex nuts | ISO 4032 · ASME B18.2.2 |
| Socket head screws | ISO 4762 · ASME B18.3 |
| Flat washers | ISO 7089 / ISO 7090 · ASME B18.21.1 |
| Custom fasteners | Customer drawing |
Raw-material specifications
| Product form / scope | Reference |
|---|---|
| Rod, bar & wire | ASTM B164 / ASME SB164 · AMS 4675 / 4730 / 4731 |
| Forgings | ASTM B564 / ASME SB564 · AMS 4675 |
| Plate, sheet & strip | ASTM B127 / ASME SB127 · AMS 4544 |
| Seamless pipe & tube | ASTM B165 / B829 · ASME SB165 / SB829 · AMS 4574 |
| Heat-exchanger tube | ASTM B163 / ASME SB163 |
| Welded tube | ASTM B730 / B751 · ASME SB730 / SB751 |
| Welded pipe | ASTM B725 / B775 · ASME SB725 / SB775 |
| Fittings | ASTM B366 / ASME SB366 |
Dimensions do not define material or finished-part compliance. Specify the grade, condition and applicable requirements.
How to specify round bar, plate, wire and strip ↗Monel 400 Mechanical Properties
Reference sample and condition
- Data basis
- Typical catalogue reference
- Condition
- Annealed
| Key properties | Value |
|---|---|
| Tensile strength | 550 MPa |
| 0.2% yield strength | 240 MPa |
| Elongation | 40% |
Monel 400 Physical Properties
| Property | Value | Unit |
|---|---|---|
| Density | 8.80 | g/cm³ |
| Melting range | 1300–1350 | °C |
Temperature curves and values
Tensile and yield strength
Annealed material · supplied reference
Approximate readings from the reference figure · not design allowables
Supplied technical reference · Scanned PDF page 14 · printed page 26Elongation vs temperature
Annealed material · supplied reference
Approximate readings from the reference figure · not design allowables
Supplied technical reference · Scanned PDF page 14 · printed page 26Procurement and application guide
Specify the material and final condition
Specify the medium and flow conditions, especially for seawater.
Material forms in the technical reference: Round bar · Flat bar · Wire · Plate · Sheet · Strip · Pipe & tube · Forging stock · Hexagon & sections.
Define the finished-part acceptance
Include the material or bolting specification, required final condition, dimensions and quantity. State the service medium, temperature and loading where known. Agree the required tests, inspection coverage and acceptance criteria for the finished part.
Start with the information you have
Send a drawing or share the product form and dimensions. Identify any undecided requirements for review rather than copying a typical property value into the purchase order.
Upload DrawingCondition-specific data
Catalogue minimums
A5 elongation, as labelled in the supplied table.
| Reference / condition | Tensile MPa | Yield 0.2% MPa | Elongation % |
|---|---|---|---|
| ASTM B164 / ASME SB164 · AMS 4675 / 4730 / 4731 | ≥480 | ≥170 | ≥35 |
Technical guides
All technical articles ↗
Nickel Alloy Fasteners: Selection and Specification Guide
Nickel-Alloy Fastener Galling
MTC vs PMI vs Inspection Report: Which One Actually Proves Your Fastener Meets the Order?Selection and specification · 3
Installation and inspection · 3
Quality documents
EN 10204 3.1 MTC
Material certification and heat-number traceability
Mechanical testing
Methods and acceptance criteria follow the agreed specification
Alloy 718 laboratory report · PDF ↗Thread inspection
Sampled GO/NO-GO gauging for threaded products
Additional inspection and records
Heat-treatment records, PMI and third-party scope agreed per order
View PMI sample ↗Specify your Monel 400 fastener
Sources and references
- Supplied technical reference · Scanned PDF page 5 · printed page 17
- Special Metals · Monel Alloy 400 · Technical bulletin · identity, composition, applications and listed specifications ↗
- Supplied technical reference · Scanned PDF page 14 · printed page 26
- Special Metals - K-500 · Material identity, characteristics and application context. ↗
Additional published references
- BS 3072–3076 (NA13); DIN 17743 / 17750–17754; VdTÜV 263; QQ-N-281; AMS 7233 (rivets); AECMA PrEN 2305 (rivet wire) Special Metals · Monel Alloy 400 · Technical bulletin · identity, composition, applications and listed specifications ↗
- NACE MR0175 / ISO 15156 Supplied technical reference · Scanned PDF page 14 · printed page 26