Monel Button Head Socket Cap Screw Manufacturer
MT.BOLTS manufactures Monel Flat Head Socket Cap Screws using high-corrosion-resistant Monel alloys such as Monel 400 and Monel K500. These screws are ideal for applications requiring flush mounting in marine engineering, chemical processing, and high-temperature environments.
Our Monel Flat Head Socket Cap Screws have the following specifications:
- Diameter: M3 to M64 | #4 to 2.5″
- Length: 6mm to 500mm | 0.25″ to 20″
- Thread Pitch: Metric (Coarse/Fine) | UNC/UNF
- Standards: ASME B18.3, DIN/ISO/EN equivalents
- Material Specifications: ASTM F467, ASTM F468, ASTM B164 (Monel 400), ASTM B865 (Monel K500)
- Head Type: Flat Head (Countersunk)
- Drive Type: Internal Hex (Allen)
We regularly supply Monel Flat Head Socket Cap Screws made from two material grades – Monel 400 and Monel K500. Below are their chemical compositions and physical properties for your procurement reference.
Monel Button Head Socket Cap Screw Chemical Composition
| Element | Nickel (Ni) | Copper (Cu) | Iron (Fe) | Manganese (Mn) | Carbon (C) | Aluminum (Al) | Titanium (Ti) | Silicon (Si) | Sulfur (S) |
| Monel 400 | ≥ 63% | 28 – 34% | ≤ 2.5% | ≤ 2.0% | ≤ 0.30% | — | — | ≤ 0.50% | ≤ 0.024% |
| Monel K500 | ≥ 63% | 27 – 33% | ≤ 2.0% | — | ≤ 0.25% | 2.3 – 3.15% | 0.35 – 0.85% | ≤ 0.50% | ≤ 0.010% |
Monel Button Head Socket Cap Screw Mechanical Properties
| Alloy | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) |
| Monel 400 | ≥ 480 | ≥ 170 | ≥ 35 |
| Monel K500 | ≥ 965 | ≥ 690 | ≥ 20 |
Production Process of Monel Flat Head Socket Cap Screws
- Step 1. Material Preparation
- Raw Material: Select high-quality Monel 400 (UNS N04400) or Monel K500 (UNS N05500) bars or wire rods.
- Materials must comply with standards such as ASTM B164 or ASTM B865, offering excellent corrosion resistance and mechanical properties.
- Step 2. Cold or Hot Heading
- Use cold heading or hot heading machines to form the basic shape of the screw, including the shank and round head.
- Hot heading is often used for Monel K500 due to its higher strength and work-hardening behavior.
- Step 3. Head Machining (Button Head with Hex Socket)
- Precision forming of the button-shaped head and internal hex socket using special dies or CNC machines.
- The hex socket must be accurately machined to ensure proper fit with Allen keys or hex wrenches.
- Step 4. Threading
- Threads are produced via thread rolling or cutting:
- Thread rolling is preferred for high-volume production and stronger threads.
- Thread cutting is suitable for custom or low-volume production.
- Available thread types include Metric Coarse/Fine and UNC/UNF.
- Step 5. Heat Treatment (for Monel K500 only)
- Monel K500 undergoes age hardening to improve strength and hardness.
- Typical aging is done at 480–620°C (896–1148°F) for several hours depending on part size and hardness requirements.
- Step 6. Surface Finishing
- Optional finishing processes include light polishing, pickling, or anti-galling coating depending on application.
- Monel generally does not require plating due to its inherent corrosion resistance.
- Step 7. Inspection & Quality Control
- Inspection items include:
- Dimensional accuracy
- Thread quality
- Concentricity of head and socket
- Material verification (chemical composition, mechanical properties)
- Quality checks are performed in accordance with ASTM F467, ASTM F468, or customer specifications.
- Step 8. Packaging & Delivery
- Screws are sorted, labeled, and packaged as per client requirements.
- Packaging options include plastic bags, cartons, wooden boxes, or pallets, along with heat numbers and Material Test Certificates (MTC).
Why Choose MT.BOLTS
- Material Diversity
- Standardized Production
- Ample Inventory
- Competitive Pricing
- Low-MOQ Customization
Reasons to Choose Monel Button Head Socket Cap Screw
- Flush Finish Design – Flat head allows the screw to sit flush with the surface, ideal for applications with smooth or aerodynamic requirements.
- Excellent Corrosion Resistance – Made from Monel 400 or Monel K500, highly resistant to seawater, acids, and alkalis.
- High Strength – Monel K500 offers enhanced tensile and yield strength through age-hardening.
- Non-Magnetic and Heat Resistant – Suitable for sensitive equipment and high-temperature environments.
- Precision Machined – Internal hex drive ensures secure tightening and reduced cam-out risk.
- Ideal for Harsh Environments – Performs reliably in offshore, chemical, and industrial settings.
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Application of Monel Button Head Socket Cap Screw
- Marine Equipment – Submersible systems, hulls, and underwater fastenings requiring flush surfaces.
- Chemical Processing – Reactors, pressure vessels, and acid-handling assemblies.
- Oil & Gas Sector – Pipeline clamps, sealing systems, and corrosion-prone zones.
- Aerospace Industry – Flush-mounted fasteners in aircraft frames and exhaust systems.
- Power Generation – Nuclear, geothermal, and offshore wind components.
- Medical Devices – Surgical instruments and corrosion-sensitive precision components.
FAQ About Monel Button Head Socket Cap Screw
Flat head screws sit flush with the surface, minimizing protrusions and enabling a smooth finish, often required in aerospace and marine applications.
Monel 400 is more ductile and corrosion-resistant; Monel K500 offers greater strength due to age-hardening but may require heat treatment.
Yes, both Monel 400 and K500 perform exceptionally well in saltwater and other aggressive marine environments.
Yes, but galvanic corrosion should be considered when used with dissimilar metals—proper insulation or matching alloys is recommended.
Yes, MT.BOLTS supports custom dimensions, thread types, and optional anti-galling or surface treatments upon request.
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