Monel Fasteners
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 Fasteners · Bolts · Nuts · Screws · Washers · Stud Bolts · Threaded Rods · Monel 400 & K500Monel Fasteners: Nickel-Copper Superalloy Bolts, Nuts, Screws, Washers, Stud Bolts & Threaded Rods for Extreme Environments
RAYCHIN LIMITED is a leading manufacturer of Monel Fasteners – precision fasteners engineered for the most demanding applications where exceptional corrosion resistance, high strength, and reliability are critical. Our comprehensive range includes Monel bolts (hex head, heavy hex, socket head), Monel nuts (hex, heavy hex, jam, lock), Monel screws (socket cap, flat head, button head), Monel washers (flat, lock, spring), Monel stud bolts (double-end, fully threaded), and Monel threaded rods. 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 NAS, AN, MS, ANSI, ASTM, ASME, SAE, API, NACE, ISO, DIN and KS standards. Whether you require Monel 400 fasteners for marine applications or Monel K500 fasteners for oil & gas downhole tools, RAYCHIN delivers precision, quality, and full traceability. All mechanical properties are presented in MPa and ksi (kilopound per square inch).
Monel Fasteners – Complete Range of Types & Configurations
Monel Bolts
Monel bolts available in hex head (finished hex, heavy hex), socket head cap (ASME B18.3, DIN 912), flange head, T-bolts, U-bolts, and eye bolts. Sizes #4 to 4" (M3 to M100). UNC, UNF, metric threads. Full thread or partial thread options. ASTM F468, ASTM B164, DIN 931/933, ISO 4014 compliant.
Monel Nuts
Monel nuts include hex nuts, heavy hex nuts, jam nuts, lock nuts (nylon insert, all-metal prevailing torque), slotted nuts, castle nuts, and flange nuts. Sizes #2 to 4" (M2 to M100). Conform to ASME B18.2.2, DIN 934, ISO 4032, ASTM F467. Monel K500 nuts available in age-hardened condition.
Monel Screws
Monel screws include socket head cap screws, flat head screws (82°/100°), button head screws, pan head screws, and set screws (cup point, flat point, cone point). Precision rolled threads. Sizes #0 to 1½" (M1.6 to M36). Conform to DIN 912, ISO 4762, ASME B18.3.
Monel Washers
Monel washers include flat washers (ANSI B18.22.1, DIN 125, ISO 7089), split lock washers (ASME B18.21.1, DIN 127), tooth lock washers (internal/external), and spring washers (Belleville, curved, wave). Sizes #2 to 2" (M2 to M48). Custom stampings available.
Monel Stud Bolts
Monel stud bolts (double-end and fully threaded) with equal or unequal thread lengths. Conform to ASTM B164, ASTM F468, API 20F. Available with two heavy hex nuts and washers. Sizes #4 to 3" (M3 to M76). NACE MR0175 compliant for sour service. Ideal for flanged connections in chemical and marine applications.
Monel Threaded Rods
Monel threaded rods (fully threaded continuous rod) available in standard lengths up to 3m (10ft) or custom cut-to-length. Sizes #4 to 2" (M3 to M48). UNC, UNF, metric threads. Precision rolled threads for superior fatigue life. Ideal for custom fastening, hangers, and tie rods in corrosive environments.
Critical Applications of Monel Fasteners
Marine & Offshore
Monel 400 fasteners are the standard choice for seawater applications, including propeller shafts, pump components, valve stems, and subsea control modules. Corrosion rates below 0.025 mm/year in seawater. Used extensively in shipbuilding, offshore platforms, and desalination plants. Outlasts stainless steel 3-5x in marine environments.
Oil & Gas / Sour Service
Monel K500 fasteners qualified per NACE MR0175 for wellhead equipment, valve bonnets, subsea actuators, and BOP assemblies. Resist sulfide stress cracking (SSC) and pitting in H₂S/CO₂ environments. Monel K500 provides yield strengths up to 790 MPa (115 ksi) in age-hardened condition, ideal for high-pressure applications.
Chemical Processing
Monel fasteners resist hydrofluoric acid (HF) – Monel 400 is the standard material for HF alkylation units. Also excellent for sulfuric acid (>80%), deaerated hydrochloric acid (low concentrations), phosphoric acid, and alkalis (caustic soda, potash). Used in reactor agitators, pump shafts, and valve assemblies.
Power Generation
Monel fasteners in feedwater heaters, steam turbine components, and nuclear reactor internals. Resist high-purity water corrosion and stress corrosion cracking. Monel 400 offers excellent performance in both fossil and nuclear power plants. Maximum service temperature up to 480°C.
Aerospace & Defense
Monel K500 fasteners used in aircraft engines, rocket motor casings, and military hardware. Non-magnetic and spark-resistant properties make them ideal for ordnance applications. Maintain strength and toughness at cryogenic temperatures down to -200°C.
Pulp & Paper / Salt Production
Monel fasteners used in digesters, liquor heaters, and salt evaporators. Resist chloride-induced corrosion in bleach plants and brine handling systems. Doctor blades and scrapers in pulp processing often made from Monel K500.
International Standards & Global Designations – Monel Fasteners
RAYCHIN LIMITED manufactures Monel fasteners 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 Fasteners
Our Monel fasteners are produced from melts conforming to the following limits per ASTM/ASME.
Monel 400 (UNS N04400 / 2.4360)
Monel K500 (UNS N05500 / 2.4375)
Metallurgical note: Monel 400 is a solid-solution strengthened alloy with excellent corrosion resistance across a wide range of media. Monel K500 adds aluminum and titanium to enable precipitation hardening (aging), achieving yield strengths exceeding 690 MPa (100 ksi) while maintaining the same corrosion resistance as Monel 400. Both alloys are non-magnetic to cryogenic temperatures and exhibit low permeability.
Complete Mechanical & Physical Properties – Monel Fasteners (MPa / ksi)
Monel fasteners are supplied in solution annealed (Monel 400) or age‑hardened (Monel K500) condition per specification. Data represent typical values based on ASTM, ASME, and industry standards. ksi values (kilopound per square inch) are provided alongside MPa.
Mechanical Properties – Typical Values (room temperature) for Monel Fasteners
Physical Properties (typical) – Monel Fasteners
High‑Temperature Performance of Monel Fasteners
Monel alloys retain useful mechanical properties at elevated temperatures up to 480°C (900°F), making them suitable for many industrial applications. Data below demonstrate the performance characteristics.
Elevated Temperature Properties – Monel 400
Maximum Service Temperatures
Note: Above 480°C, Monel alloys may experience over-aging and loss of strength. For continuous service above this temperature, consider higher nickel alloys such as Inconel.
Exceptional Corrosion Resistance of Monel Fasteners
Monel alloys are renowned for their outstanding resistance to a wide range of corrosive media, particularly in marine and acidic environments.
- Seawater: Excellent resistance to pitting, crevice corrosion, and stress corrosion cracking in both stagnant and flowing seawater. Corrosion rates <0.025 mm/year. Ideal for propeller shafts, pump components, and marine fasteners.
- Hydrofluoric Acid (HF): Monel 400 is the standard material for HF alkylation units in refineries. Outstanding resistance to anhydrous HF and hydrofluoric acid at all concentrations up to boiling point.
- Sulfuric Acid: Good resistance at concentrations above 80% and temperatures up to 100°C. Not recommended for dilute sulfuric acid.
- Hydrochloric Acid: Suitable for deaerated HCl at low concentrations. Aerated conditions accelerate attack.
- Phosphoric Acid: Excellent resistance, used extensively in fertilizer production.
- Alkalis: Outstanding resistance to caustic soda and potash at all concentrations and temperatures up to boiling.
- Chloride Stress Corrosion Cracking: Monel alloys are immune to chloride SCC, unlike austenitic stainless steels.
- Non-Magnetic: Both Monel 400 and K500 are non-magnetic to -150°C and have low permeability.
Corrosion Resistance Ratings (1=Excellent, 2=Good, 3=Not Recommended):
Manufacturing Standards – Monel Fasteners
All Monel fasteners are manufactured and tested to meet:
We offer surface finishes: passivation (ASTM A967), silver plating (AMS 2410 for anti‑seize), PTFE coating, electropolish. Full traceability and destructive/non‑destructive testing available (UT, MPI, PMI). Cleanroom packaging available for semiconductor and medical applications.
Why RAYCHIN LIMITED – The Monel Fastener Authority
Contact the Monel fastener experts
Request a quotation for Monel fasteners, bolts, nuts, screws, washers, stud bolts, threaded rods – any standard (NAS, MS, AN, ANSI, ASTM, ASME, API, NACE, ISO, DIN, KS) – any Monel grade (400, K500), any quantity. Global delivery. Mechanical data in MPa/ksi available for all products.
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