Monel 400 Flat Washers
MT.BOLTS manufactures precision-engineered Monel 400 Flat Washers, crafted from high-corrosion-resistant nickel-copper alloy Monel 400 (UNS N04400). These flat washers are designed for use in demanding applications where excellent corrosion resistance and mechanical integrity are required—such as in marine environments, chemical plants, and high-temperature systems.
Monel 400 Flat Washers — Specifications:
- Inner Diameter Range: M3 to M64 | #4 to 2.5″
- Outer Diameter & Thickness: As per DIN 125, DIN 9021, or custom dimensions
- Standards:
- DIN 125 / DIN 9021 (Metric Flat Washers)
- ASME B18.22.1 (Inch Flat Washers)
- Material Specifications:
- ASTM F468 (Nonferrous Fastener Components)
- ASTM B164 (Monel 400 Rod/Bar for stamping or machining)
- Surface Finish: Plain (no coating needed) or optional PTFE/MoS₂ coating
Monel 400 Flat Washers — Features & Benefits
- Excellent resistance to seawater, brine, acids, and alkaline environments
- High mechanical strength and toughness across wide temperature ranges
- Non-magnetic in annealed condition
- Suitable for high-pressure bolted joints
- Ideal for harsh, corrosive environments (marine, chemical, oil & gas)
Chemical Composition (ASTM B164)
| Element | Nickel (Ni) | Copper (Cu) | Iron (Fe) | Manganese (Mn) | Silicon (Si) | Carbon (C) | Sulfur (S) |
| Content (%) | ≥ 63.0 | 28.0–34.0 | ≤ 2.5 | ≤ 2.0 | ≤ 0.5 | ≤ 0.3 | ≤ 0.024 |
Mechanical Properties (Typical)
| Property | Tensile Strength | Yield Strength | Elongation | Hardness |
| Value | ≥ 70 ksi (483 MPa) | ≥ 25 ksi (172 MPa) | ≥ 30% | 110 – 230 HB (Brinell) |
Matching Standards
- ASTM F468 – Nonferrous washers for general service
- ASTM B164 – Monel 400 bar/rod used for washer production
- ASME B18.22.1 – Inch series flat washers
- DIN 125 / DIN 9021 – Metric flat washers
Selection Guide for Monel 400 Flat Washers
| Washer Type | Standard | ID Range | Applications |
| Flat Washer (Standard) | DIN 125 / B18.22.1 | M3–M64 / #4–2.5″ | General load distribution |
| Large OD Flat Washer | DIN 9021 | M6–M48 | Surface protection and vibration damping |
| Custom Machined | — | As required | High-precision or oversized assemblies |
Why Choose MT.BOLTS
- Material Diversity
- Standardized Production
- Ample Inventory
- Competitive Pricing
- Low-MOQ Customization
Monel 400 Flat Washers Features & Benefits:
✅ Excellent Corrosion Resistance
Resists corrosion in seawater, salt solutions, acids (such as hydrofluoric and sulfuric), and alkalis.
✅ High Strength & Durability
Retains mechanical integrity under pressure and thermal stress.
✅ Non-Magnetic in Annealed Condition
Ideal for sensitive electronic and marine applications requiring non-magnetic properties.
✅ Wide Temperature Operating Range
Performs reliably in temperatures from sub-zero to around 480°C (900°F).
✅ Good Load Distribution
Distributes load evenly under nuts and bolt heads, reducing surface damage and preventing loosening.
✅ Ideal for Harsh Environments
Perfect for marine, chemical, oil & gas, and high-temperature industrial use.
✅ Low Maintenance Material
Naturally corrosion-resistant without the need for plating or surface coatings.
Send Us A Message
Application of Monel 400 Flat Washers
- Marine and offshore equipment
- Desalination plants and heat exchangers
- Chemical processing equipment
- High-temperature bolted joints
- Pump and valve assemblies in corrosive environments
FAQ About Monel 400 Flat Washers
Yes, Monel 400 offers outstanding resistance to seawater corrosion, making it ideal for marine use.
Yes, washers can be manufactured to custom ID, OD, and thickness per drawing or specification.
No, it is non-magnetic in the annealed condition.
Monel 400 can typically be used up to 480 °C (900 °F) under continuous exposure.
Yes, but galvanic corrosion should be considered in wet environments—prefer matching Monel fasteners when possible.
Related Products
17-4 PH Stainless Steel Fasteners
17-4 PH Stainless Steel Fasteners Supplier MT.BOLTS manufactures 17-4 PH stainless steel fasteners using high-quality precipitation-hardening stainless steel. These fasteners
18-8 stainless steel fasteners
18-8 Stainless Steel Fasteners Supplier MT.BOLTS manufactures 18-8 stainless steel fasteners using high-quality austenitic stainless steel grades such as 304,
ASTM A307 Bolts
ASTM A307 Bolts Supplier MT.BOLTS manufactures ASTM A307 carbon steel bolts using high-quality low-carbon steel materials. These bolts offer reliable