Monel Button Head Cap Screws
RAYCHIN SPECIALTY METALS FASTENERS: BOLTS, NUTS, SCREWS, WASHERS, STUDS, THREADED RODS, U-BOLT, J-BOLTS
STANDARD AND CUSTOMIZED, SMALL BATCH AND LARGE BATCH, IMPERIAL AND METRIC
A Ni-Cu alloy with high strength and good corrosion resistance
Excellent resistance to hydrofluoric acid
Excellent resistance to sea water for marine applications
Cryogenic capabilities
High strength metal with good toughness at high temperatures
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RAYCHIN LIMITED
Monel Button Head Cap Screws · Low Profile Socket Head · Monel 400 / K500 · ASME B18.3 · DIN 912 · ISO 7380Monel Button Head Cap Screws: Nickel-Copper Alloy Low-Profile Socket Head Screws for Smooth Surfaces & Corrosive Environments
RAYCHIN LIMITED is a premier manufacturer of Monel button head cap screws – also known as button head socket screws or low-profile socket head screws – engineered for applications requiring a smooth, rounded low-profile head combined with the exceptional corrosion resistance of nickel-copper alloys. Our range includes button head hex socket screws, button head Torx drive screws, and metric button head cap screws. Manufactured from premium nickel‑copper alloys – Monel 400 (UNS N04400) and precipitation‑hardenable Monel K500 (UNS N05500) – these fasteners deliver outstanding resistance to seawater, hydrofluoric acid, sulfuric acid, and alkalis, with Monel K500 providing yield strengths exceeding 690 MPa (100 ksi) through age hardening. Our portfolio includes all standard and custom configurations manufactured to ASME B18.3, DIN 912, ISO 7380, NAS, MS, AN, ASTM F468, SAE, API, NACE, ISO, DIN and KS standards. Whether you require Monel 400 button head screws for marine access panels or Monel K500 button head screws for chemical reactor internals, RAYCHIN delivers precision, full traceability, and mechanical properties presented in MPa and ksi.
Monel Button Head Cap Screws – Complete Range of Types & Configurations
Button Head Hex Socket Screws
Monel button head hex socket cap screws per ASME B18.3, DIN 912, ISO 7380. Low-profile rounded head with internal hex drive. Ideal for smooth surfaces and limited clearance. Sizes #2 to 1" (M2 to M24). Available in Monel 400 (annealed) and age‑hardened Monel K500.
Button Head Torx Drive Screws
Monel button head Torx drive screws (hexalobular) per ISO 10664, DIN 34800. Torx drive reduces cam-out and allows higher torque. Used in aerospace, marine, and chemical equipment. Sizes M3 to M20, #4 to ¾".
Metric Button Head Cap Screws
Full range of metric Monel button head cap screws to ISO 7380-1 (hex socket) and ISO 7380-2 (Torx). M2 to M24, coarse and fine pitch. Precision rolled threads, supplied with EN 10204 3.1 certification.
NAS / MS / AN Button Head Screws
Aerospace/military standard Monel button head screws including NAS1353, NAS1354, MS16995, MS16996, AN525 (modified). Manufactured from certified Monel bar, full inspection, passivated finish.
Button Head Shoulder Screws
Monel button head shoulder screws with unthreaded shoulder for pivot or stop applications. Combination of button head low profile and precision shoulder. Custom lengths and shoulder diameters.
Custom Button Head Screws
Custom Monel button head cap screws with special head diameters, non‑standard lengths, proprietary drives (Phillips, slotted, combination). Quick turnaround on prototypes and production runs.
Critical Applications of Monel Button Head Cap Screws
Marine & Offshore
Monel 400 button head screws secure access panels, control boxes, and lighting fixtures on ships and offshore platforms. Low-profile head prevents snagging and traps. Corrosion rate below 0.025 mm/year in seawater.
Chemical Processing (HF Acid)
Monel button head cap screws are standard for HF alkylation unit access doors, sight glass retainers, and agitator blade fasteners. Resist hydrofluoric acid, concentrated sulfuric acid, and alkalis.
Oil & Gas / Sour Service
Monel K500 button head screws qualified per NACE MR0175 for wellhead control panels, BOP accessory mounts, and valve position indicators. Yield strengths up to 790 MPa (115 ksi) resist sulfide stress cracking.
Aerospace & Defense
Monel K500 button head screws per NAS1353, MS16995 used in aircraft interior panels, avionics racks, and ordnance handling equipment. Non‑magnetic and spark‑resistant. Maintain strength from cryogenic to 480°C.
Power Generation
Nuclear and fossil plants use Monel 400 button head screws on instrument housings, cable trays, and control rod mechanism covers. Resists high‑purity water corrosion and chloride SCC.
Medical & Pharmaceutical
Monel button head cap screws for medical devices, surgical instrument handles, and cleanroom equipment. Smooth button head is easy to clean and does not trap contaminants. Non‑magnetic option.
International Standards & Global Designations – Monel Button Head Cap Screws
RAYCHIN LIMITED manufactures Monel button head cap screws from material conforming to the most widely used national and international specifications. All material is traceable to the mill.
Chemical Composition (Weight %) – Monel Alloys for Button Head Cap Screws
Our Monel button head cap screws are produced from melts conforming to ASTM/ASME/AMS limits.
Monel 400 (UNS N04400 / 2.4360)
Monel K500 (UNS N05500 / 2.4375)
Metallurgical note: Monel 400 is a solid‑solution alloy with excellent corrosion resistance. Monel K500 adds Al and Ti for precipitation hardening (aging), achieving yield strengths >690 MPa (>100 ksi) while retaining the corrosion resistance of Monel 400. Both alloys are non‑magnetic and resist chloride SCC.
Complete Mechanical & Physical Properties – Monel Button Head Cap Screws (MPa / ksi)
Monel button head cap screws supplied in solution annealed (Monel 400) or age‑hardened (Monel K500) condition per ASTM F468. ksi values provided.
Mechanical Properties – Typical & Specified Minimum (room temperature)
Monel K500 has approximately three times the yield strength of Monel 400 after age hardening.
Physical Properties (typical)
High‑Temperature Performance of Monel Button Head Cap Screws
Monel alloys retain useful mechanical properties up to 480°C (900°F).
Elevated Temperature Properties – Monel K500 (aged)
Monel K500 maintains high strength up to 480°C; age‑hardened structure is stable. Above 480°C, over‑aging may occur.
Exceptional Corrosion Resistance of Monel Button Head Cap Screws
- Seawater: Corrosion rate <0.025 mm/year. Immune to chloride pitting, crevice corrosion, and SCC.
- Hydrofluoric Acid (HF): Monel 400 is the standard material for HF alkylation. Excellent resistance to anhydrous HF and hydrofluoric acid at all concentrations up to boiling point.
- Sulfuric Acid: Good resistance above 80% concentration and up to 100°C.
- Alkalis: Outstanding resistance to caustic soda and potash at all concentrations up to boiling.
- Chloride Stress Corrosion Cracking: Monel alloys are immune to chloride SCC, unlike 300 series stainless.
- Non‑Magnetic: Both alloys are non‑magnetic to cryogenic temperatures. Permeability <1.01.
Corrosion Ratings (1=Excellent, 2=Good, 3=Not Recommended)
Manufacturing Standards – Monel Button Head Cap Screws
All Monel button head cap screws are manufactured and tested to meet:
Surface finishes: passivation (ASTM A967), silver plating (AMS 2410 for anti‑galling), PTFE coating, electropolish. Full traceability, PMI testing, ultrasonic/magnetic particle inspection available.
Why RAYCHIN LIMITED – The Monel Button Head Screw Authority
Contact the Monel button head cap screw experts
Request a quotation for Monel button head cap screws, button head socket screws, low profile screws – any standard (ASME B18.3, DIN 912, ISO 7380, NAS, MS, AN, ASTM, API, NACE, KS) – any Monel grade (400, K500), any quantity. Global delivery. Mechanical data in MPa/ksi available for all products.
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