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Monel Fasteners

Monel fasteners, like Monel 400 and K500, are made from a nickel-copper alloy and exhibit high strength, toughness and good corrosion resistance over a wide temperature range from cryogenic up to 1000°F. An outstanding characteristic of Monel fasteners is that they offer exceptional resistance to hydrofluoric acid, a particularly tough acid to deal with, in all concentrations up to the boiling point. For hydrofluoric acid applications Monel fasteners are perhaps the most resistant of all commonly used specialty alloys.

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

Name: Monel Fasteners
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Monel Fasteners · Bolts · Nuts · Screws · Washers · Stud Bolts · Threaded Rods · Monel 400 & K500

Monel Fasteners: Nickel-Copper Superalloy Bolts, Nuts, Screws, Washers, Stud Bolts & Threaded Rods for Extreme Environments

Monel 400 (UNS N04400) | Monel K500 (UNS N05500)

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 fastenersMonel boltsMonel nutsMonel screwsMonel washersMonel stud boltsMonel threaded rodsMonel 400 fastenersMonel K500 fastenersUNS N04400 boltsUNS N05500 nutsASTM B164 fastenersASTM F467 Monel nutsASTM F468 Monel boltsNACE MR0175 fastenersseawater resistant fastenerscorrosion resistant boltsnickel copper alloy fastenersmarine fastenersHF acid resistant fasteners

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.

Manufacturing Standards for Monel Fasteners

RAYCHIN LIMITED manufactures Monel fasteners to the following national and international standards, ensuring full compliance for projects worldwide. Both standard and non-standard custom configurations are available.

Monel Fastener Styles

Monel Screws	12 Point Screws Button Head Cap Screws Flat Head Screws Hex Head Cap Screws Pan Head Screws Security Screws Set Screws Socket Head Cap Screws Vented Screws	• DIN 603 / ISO 8677 • DIN 912 / ISO 4762 • DIN 913 / ISO 4026 • DIN 914 / ISO 4027 • DIN 915 / ISO 4028 • DIN 916 / ISO 4029 • DIN 921 • DIN 931 / ISO 4014 • DIN 933 / ISO 4017 • DIN 961 / ISO 8676 • DIN 965 / ISO 7046 • DIN 966 / ISO 7047 • DIN 7991 / ISO 10642 • DIN 7380 / ISO 7380 • DIN 84 / ISO 1207 • DIN 85 / ISO 1580 • DIN 34822 • DIN 34821 • DIN 7504 / ISO 15480 • DIN 7984 • DIN 963 / ISO 2009




















Monel Bolts	Hex Head Bolts Shoulder Bolts Wedge Anchor Bolts	• DIN 931 • DIN 933 • ISO 4014 • ISO 4017 • ISO 7370




Monel Nuts	Hex Nuts Lock Nuts	• DIN 439 / ISO 4035 • DIN 934 / ISO 4032 • DIN 985 / ISO 7040 • DIN 986 • DIN 980 / ISO 7042 / ISO 19513 • DIN 6923 / ISO 4161





Monel Studs/Rod	Studs Threaded Rod Weld Studs	• DIN 975 • DIN 976


Monel Washers	Flat Washers Lock Washer	• DIN 125 / ISO 7089 / ISO 7090 • DIN 126 / ISO 7091 • DIN 127 / ISO 7090 • DIN 9021 / ISO 7093



Monel Hose Clamps	Medium Duty Hose Clamps	--

Monel Screws

12 Point Screws	Monel 12 point screws allow for higher torque to be applied than a socket head cap screw or head head bolt, however they are be less economical due to the complex head design. Available in 1/4" or larger sizes.	• IFI-115 • MIL SPEC • DIN 34822 • DIN 34821



Button Head Cap Screws	Monel button head screws offer a wide clamping area and low profile. They are best for fastening material that is too thin to counter bore.	• ASME B18.3 • ASME 18.3.4M • DIN 7380 / ISO 7380


Flat Head Screws	Monel flat head screws are most commonly offered in an 82° countersink angle, but can be customized to other angles from 60° -120° and are designed to be flush with the surface. Available in slotted and socket drivers. Phillips, 6-lobe, torx and tamperproof drivers in Inconel flat head screws can be made require special manufacturing.	• ASME B18.3 • ASME B18.3.6 • DIN 963 / ISO 2009 • DIN 965 / ISO 7046 • DIN 7991 / ISO 10642




Hex Head Cap Screws	Monel hex head cap screws offer the added washer face to the bolt head which is lacking on a hex bolt and tighter dimensional tolerances. Ideal for a high clamping force applications with ease of access. Generally availabe in #2 - 1/2" sizes and metric sizes.	• ASME B18.6.3 • DIN 931 / ISO 4014 • DIN 933 / ISO 4017 • DIN 961 / ISO 8676



Pan Head Screws	Monel pan head screws offer a rounded top are best used for small diameter faster needs. Offered in slotted and they are ideal for low torque applications.	• ASME B18.6.3 • DIN 7985 • DIN 921 • DIN 85 / ISO 1580 • DIN 84 / ISO 1207 (cheese head) • DIN 966 / ISO 7047 (raised counter sunk)







Security Screws	Unique driver designs offer these Monel screws resistance to unwanted tampering or removal due to the fact that they cannot be removed using an ordinary driver. Inconel security screws are available in several different drive styles, as well as custom per print.	--

Set Screws	Monel set screws are available in cup, cone, flat, dog and half-dog points. Set screws have no head and are equiped with a socket or slotted driver at one end.	• ASME B18.3 • DIN 913 / ISO 4026 • DIN 914 / ISO 4027 • DIN 915 / ISO 4028 • DIN 916 / ISO 4029




Socket Head Cap Screws	Monel socket head cap screws are ideal for limited access situations where there is little clearance around the screws. They offer a safe, reliable and economic solution.	• ASMET B18.3 • DIN 912 / ISO 4762 • DIN 7984


Vented Screws	Monel vented screws are best for vacuum environments because the hole drilled through its axis (from head through threads) allow gases and other contaminents to vent. Inconel vented screws are available in any style.	--

Monel Bolts

Hex Head Bolts	Monel hex bolts are similar to hex head cap screws but without the added washer face. They are ideal for high clamping force applications with ease access.	• ASME B18.2.1 • DIN 931 / ISO 4014 • DIN 933 / ISO 4017


Shoulder Bolts	Monel shoulder bolts are made up of a head, shoulder and threaded segment. The smooth shoulder section allows for rotating parts. Typically available with socket drivers.	• ASME • DIN 7379 / ISO 7379 • ISO 7370


Wedge Anchor Bolts	Monel wedge anchor bolts offer a safe secure fastening solution for attaching equipment and other materials to concrete in corrosive environments.	--

Monel Nuts

Hex Nuts	Monel hex nuts are available in a variety of styles including finished hex nuts, jam nuts and heavy hex nuts.	• ASME B18.16.3 • ASME B18.2.2 • DIN 439 / ISO 4035 • DIN 934 / ISO 4032 • DIN 986




Lock Nuts	Monel lock nuts are available in all metal and polymer insert styles. All-metal lock provide even load distribution and can be used at high temperatures. Polymer insert styles are more economical and are best for temperatures under than 350°F.	• ASME B18.16.3M • DIN 980 / ISO 7042 / ISO 19513 • DIN 6923 / ISO 4161 • DIN 985 / ISO 10511 / ISO 7040

Monel Studs & Threaded Rod

Studs	Monel studs are fully threaded or partially threaded and made to custom lengths.	• ASME B18.31.2 • DIN 976

Threaded Rod	Monel threaded rod or all thread are available in lengths greater than 1 foot. Minimum order quantity is a total of 6 feet of length.	• ASME B1.1 • DIN 975

Weld Studs	Monel weld studs are available in both arc or capacitor discharge (CD) styles. Weld studs provide an extremely secure fastening solution when one side of the stud needs to be permanently fix to a part and the other side with the threads accessible.	--

Monel Washers

Flat Washers	Monel washers are most commonly offered in SAE sizes, but also availabe in USS, oversized and custom sizes upon request.	• ASME 18.21.1 • SAE / USS • DIN 125 / ISO 7089 / ISO 7090 • DIN 126 / ISO 7091




Lock Washers	Monel lock washers are offered as split lock washers. Belleville spring lock washers can also be made upon request.	• ASME B18.21.1 • DIN 127 / ISO 7090 • DIN 6796 / ISO 10690

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.

Monel Grade	UNS	DIN / W. Nr.	EN	BS	Applicable Specifications (Fasteners)
Monel 400	N04400	2.4360 / 2.4361	NiCu30Fe	NA13	ASTM B164 (rod/bar), ASTM F467 (nuts), ASTM F468 (bolts/screws), ASME SB164, NACE MR0175, DIN 931/934, ISO 4014/4032
Monel K500	N05500	2.4375	NiCu30Al	NA18	ASTM B865 (rod/bar), ASTM F467 (nuts), ASTM F468 (bolts/screws), ASME SB865, NACE MR0175, SAE AMS 4676, high-strength fasteners

UNS N04400 2.4360 UNS N05500 2.4375 ASTM B164 ASTM B865 ASTM F467 ASTM F468 NACE MR0175 API 20F

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)

Element	Min %	Max %	Typical
Ni (+Co)	63.0	—	66.5
Cu	28.0	34.0	31.5
Fe	—	2.5	1.5
Mn	—	2.0	1.0
Si	—	0.5	0.2
C	—	0.30	0.15
S	—	0.024	0.010

Monel K500 (UNS N05500 / 2.4375)

Element	Min %	Max %	Typical
Ni (+Co)	63.0	—	65.0
Cu	27.0	33.0	30.0
Al	2.30	3.15	2.80
Ti	0.35	0.85	0.60
Fe	—	2.0	1.0
Mn	—	1.5	0.8
Si	—	0.5	0.2
C	—	0.25	0.10
S	—	0.010	0.005

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

Grade / Condition	Tensile Strength (MPa)	Tensile Strength (ksi)	Yield Strength 0.2% (MPa)	Yield Strength 0.2% (ksi)	Elongation (%)	Hardness
Monel 400 (annealed)	480-550	70-80	170-240	25-35	35-40	~70 HRB
Monel 400 (hot finished)	550-620	80-90	240-310	35-45	30-35	75-85 HRB
Monel K500 (age hardened)	965-1100	140-160	690-790	100-115	20-25	25-35 HRC

Physical Properties (typical) – Monel Fasteners

Property	Monel 400	Monel K500
Density (g/cm³)	8.84	8.44
Melting Range (°C)	1300-1350	1315-1350
Thermal Conductivity (W/m·K) at 20°C	21.7	17.5
Modulus of Elasticity (GPa)	185	180
Thermal Expansion (10⁻⁶/°C 20-100°C)	13.9-14.1	13.7
Electrical Resistivity (µΩ·cm)	48-51	61.5

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

Temperature (°C)	Temperature (°F)	Tensile Strength (MPa)	Tensile Strength (ksi)	Creep Rupture (1000h stress)
20	70	550	80	—
200	390	520	75	—
400	750	450	65	~200 MPa
480	900	380	55	~120 MPa

Maximum Service Temperatures

Grade	Maximum Service Temperature (continuous)	Characteristics
Monel 400	480°C (900°F)	Good oxidation resistance; retains ~70% of RT strength at 400°C
Monel K500	480°C (900°F)	Excellent strength retention; age-hardened structure stable to 480°C

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):

Environment	Monel 400	Monel K500
Seawater	1	1
Hydrofluoric Acid	1	1
Sulfuric Acid (>80%)	1	1
Phosphoric Acid	1	1
Hydrochloric Acid (dilute)	2	2
Nitric Acid	3	3
Alkalis (NaOH, KOH)	1	1
Oxidizing Acids	3	3

Manufacturing Standards – Monel Fasteners

All Monel fasteners are manufactured and tested to meet:

NAS (NAS1802, NAS1351, NAS1352, NAS562)MS (MS16995, MS20073-20083, MS21042)AN (AN3-AN20, AN42-AN73, AN507, AN525)ANSI B18.2.1, B18.2.2, B18.3, B18.5, B18.22.1, B18.21.1ASTM B164, B865, F467, F468ASME SB164, SB865SAE (AMS 4676, AMS 4730)API 6A, 20FNACE MR0175 / ISO 15156ISO 4014, 4017, 4032, 4035, 4762, 7089DIN 931, 933, 934, 912, 125, 127KS B1002, B1003, B1020EN 10204 3.1/3.2

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

Metallurgical expertise: Decades of experience with nickel‑copper alloys. We ensure correct heat treatment: solution anneal for Monel 400, age hardening for Monel K500 per ASTM/AMS schedules. In‑house PMI verifies chemistry of every heat.

Global certifications: ISO 9001, AS9100D, PED, API. All fasteners supplied with EN 10204 3.1/3.2 certifications, NACE compliance when required.

Precision forming & threading: CNC cold heading and thread rolling ensure consistent geometry, accurate drives, and Class 2A/3A thread fit. 100% inspection available.

Custom solutions: Special head dimensions, proprietary drives, non‑standard lengths, and tailored packaging. We support urgent delivery and JIT programs.

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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Monel Fasteners

Monel Fasteners: Nickel-Copper Superalloy Bolts, Nuts, Screws, Washers, Stud Bolts & Threaded Rods for Extreme Environments