Monel Button Head Socket Cap Screw Manufacturer
MT.BOLTS manufactures Monel Button Head Socket Cap Screws using high-corrosion-resistant Monel alloys such as Monel 400 and Monel K500. These screws are ideal for marine engineering, chemical processing, and high-temperature applications.
Our Monel Button 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: Button Head
- Drive Type: Internal Hex (Allen)
We regularly supply Monel Button 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 Button 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
- Superior Corrosion Resistance – Performs exceptionally well in seawater, brine, acids, and alkalis.
- High Strength and Toughness – Especially with Monel K500, offering greater mechanical strength.
- Excellent for High-Temperature Use – Retains strength and stability in elevated temperatures.
- Non-Magnetic – Ideal for sensitive equipment where magnetism is a concern.
- Attractive Finish – Button head design offers a clean, low-profile appearance for exposed applications.
- Reliable in Extreme Environments – Trusted in marine, chemical, and offshore applications.
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Application of Monel Button Head Socket Cap Screw
- Marine Engineering – Ships, propeller shafts, valves, and underwater fastenings.
- Chemical Processing Plants – Reactors, tanks, and acid-handling systems.
- Oil & Gas Industry – Offshore drilling rigs and subsea equipment.
- Aerospace – Jet engines, exhaust systems, and structural components.
- Power Generation – Heat exchangers and nuclear plant components.
- Medical Equipment – Corrosion-sensitive assemblies in surgical tools.
FAQ About Monel Button Head Socket Cap Screw
Monel K500 has higher strength and hardness due to age-hardening, while Monel 400 offers excellent corrosion resistance with good ductility.
Yes, both grades are highly resistant to saltwater corrosion and are ideal for marine use.
Monel 400 is essentially non-magnetic; Monel K500 may develop slight magnetism after cold working.
Our screws conform to ASME B18.3, DIN/ISO equivalents, and material specs like ASTM B164 and ASTM B865.
Yes, we provide custom dimensions, threads, and finishes upon request.
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