Monel 400 Hex Bolts
MT.BOLTS manufactures precision-engineered Monel 400 Hex Bolts, made from high-corrosion-resistant nickel-copper alloy Monel 400 (UNS N04400). These hex bolts are ideal for critical fastening in harsh environments such as marine engineering, chemical processing, and high-temperature applications.
Monel 400 Hex Bolts—Specifications:
- Diameter: M3 to M64 | #4 to 2.5″
- Length: 6mm to 500mm | 0.25″ to 20″
- Thread Pitch: Metric (Coarse/Fine) | UNC / UNF
- Head Type: Hex Head (Standard / Heavy Hex)
- Thread Type: Full Thread or Partial Thread
- Standards:
- ASME B18.2.1 (Hex Bolts—Inch)
- DIN 933 / ISO 4017 (Hex Bolts—Metric)
- Material Specifications:
- ASTM F468 (Nonferrous Bolts)
- ASTM B164 (Monel 400 Rod/Bar)
- Surface Finish: Plain (no coating required) or optional PTFE/MoS₂ coating
- Marking: Grade, size, and manufacturer’s identification upon request
Monel 400 Hex Bolts Features & Benefits:
- Outstanding corrosion resistance in seawater and chemical media
- Non-magnetic and stable at elevated temperatures (up to 550°C)
- Good mechanical strength and excellent ductility
- Ideal for high-load, anti-galling, anti-corrosion fastening applications
- Compatible with Monel 400 washers and nuts for full system integrity
Monel 400 Hex Bolts Chemical Composition (ASTM B164)
| lement | 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 |
Monel 400 Hex Bolts Mechanical Properties (Typical per ASTM F468)
| Property | Tensile Strength | Yield Strength | Elongation | Hardness |
| Value | ≥ 70 ksi (483 MPa) | ≥ 25 ksi (172 MPa) | ≥ 30% | 110 – 230 HB (Brinell) |
Matching Standards for Monel 400 Hex Bolts and Nuts
| Bolt Standard | Matching Nut Standard | Material Description |
| ASTM F468 (Monel 400 bolts) | ASTM F467 (Monel 400 nuts) | Designed for paired use to ensure consistent corrosion resistance and mechanical strength |
| DIN 933 / ISO 4017 | DIN 934 / ISO 4032 | Metric/European standards – thread and material must match |
Note: Monel 400 has a different thermal expansion coefficient compared to stainless steel. It is not recommended to mix Monel bolts with stainless steel nuts.
Selection Guide for Monel 400 Hex Bolts
| Service Environment | Recommended Selection |
| Marine/Salt Spray | Use ASTM F468 Monel 400 bolts + ASTM F467 Monel 400 nuts for full corrosion protection |
| Chemical Processing Plants | Combine with PTFE or nickel washers for improved sealing and electrochemical stability |
| High-Temperature Applications (≤550°C) | Stable performance under heat; not recommended for continuous use above 600°C |
| High-Torque/Anti-Loosening | Use UNF (fine thread) and pair with lock nuts or spring washers for enhanced vibration resistance |
Why Choose MT.BOLTS
- Material Diversity
- Standardized Production
- Ample Inventory
- Competitive Pricing
- Low-MOQ Customization
Monel 400 Hex Bolts Features & Benefits:
Outstanding corrosion resistance in seawater and chemical media
- Non-magnetic and stable at elevated temperatures (up to 550°C)
- Good mechanical strength and excellent ductility
- Ideal for high-load, anti-galling, anti-corrosion fastening applications
- Compatible with Monel 400 washers and nuts for full system integrity
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Application of Monel 400 Hex Bolts
- Marine equipment and seawater pipelines
- Chemical reactors and storage tanks
- Heat exchangers and condensers
- Oil and gas offshore platforms
- Power generation and nuclear facilities
FAQ About Monel 400 Hex Bolts
Monel 400 Hex Bolts are high-strength fasteners made from Monel 400, a nickel-copper alloy known for exceptional corrosion resistance, especially in marine and chemical environments.
It is not recommended to mix Monel 400 bolts with stainless steel nuts due to differences in thermal expansion and galvanic corrosion potential. Use matching Monel 400 nuts (ASTM F467) for best performance.
Yes, they perform well up to 550°C but are generally not recommended for continuous exposure above 600°C.
Use matching Monel 400 nuts and washers, select appropriate thread pitch (fine threads for high vibration), and consider lock nuts or spring washers to prevent loosening.
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