Monel

Monel 400 Fasteners

High-Strength Nickel-Copper UNS N04400 Industrial & Marine Fasteners, Heavy Hex Bolts, Stud Bolts, Hex Nuts, and Washers

Grade Monel 400 / Alloy 400 (UNS N04400, DIN 2.4360, W.Nr 2.4361, NiCu30Fe, ASTM F468 / F467 Class N04400)
Standard ASTM F468, ASTM F467, ASME B18.2.1, ASME B18.2.2, ASME B18.3, DIN 931, DIN 933, DIN 934, DIN 976, DIN 912, ISO 4014, ISO 4017, ISO 4032, BS 3799, NACE MR0175 / ISO 15156
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Product Overview

Om Export India Pvt Ltd is a leading manufacturer, stockist, and global exporter of high-integrity Monel 400 Fasteners (ASTM F468 / ASTM F467 / UNS N04400 / Werkstoff 2.4360 / Alloy 400). Monel 400 is a solid-solution nickel-copper binary alloy containing a minimum of 63% Nickel and 28% to 34% Copper. Engineered to deliver mechanical resilience, high shear strength, and superior resistance to pitting and crevice corrosion, Monel 400 bolting components perform reliably across high-velocity marine environments, hydrofluoric acid alkylation media, non-oxidizing mineral acids, and boiling caustic alkalies.

Our fastener manufacturing capabilities cover precision cold-forged, hot-forged, and bar-stock CNC machined fasteners conforming to ASME B18.2.1, DIN, ISO, and BS standards. Threading configurations include UNC, UNF, and metric coarse/fine pitch with tight Class 2A/3A and 6g/6H tolerances. Designed to resist embrittlement and chloride-induced stress corrosion cracking, our Monel 400 bolts, studs, nuts, and washers maintain their structural toughness and load-bearing properties across temperatures ranging from sub-zero cryogenic levels (-200°C) up to 1000°F (538°C).

  • Severe Marine & Caustic Resistance: Immunity to chloride-induced stress corrosion cracking, seawater splash zone erosion, and boiling alkali solutions.
  • High-Temperature & Cryogenic Toughness: Retains impact ductility and high tensile yield strength from -200°C up to 538°C without experiencing a ductile-to-brittle transition.
  • Precision Threading: CNC-cut and cold-rolled threads (UNC, UNF, Metric 6g/6H) engineered to eliminate galling and ensure accurate torque-tension performance.

Key Features

  • Seawater Corrosion Immunity: High resistance to turbulent marine flow, biofouling, and pitting in saline and brackish water.
  • Hydrofluoric & Non-Oxidizing Acid Durability: Resists deaerated hydrofluoric, hydrochloric, and sulfuric acids across varying concentrations.
  • Broad Operating Temperature: Retains impact ductility without embrittlement from cryogenic sub-zero (-200°C) up to 1000°F (538°C).
  • Stress Corrosion Cracking Resistance: High resistance to chloride-induced stress corrosion cracking in high-pressure offshore and chemical environments.
  • Accurate Torque Transmission: Clean, burr-free cold-rolled and CNC-cut threads guarantee repeatable tightening torque and clamp-load retention.
  • Versatile Surface Treatments: Available in bright pickled, passivated, PTFE/Xylan fluoropolymer, zinc flake, or hot-dip galvanized coatings.

Product Specifications

Specification Parameter Standard Specification / Technical Value
Bolts & Screws Size Range M3 to M100 (Metric) | #4 to 4" (Imperial / UNC / UNF)
Stud Bolts & Threaded Rods Range M6 to M100 (1/4" to 4" Diameter) | Lengths up to 1000 mm (1 Meter) & Custom
Nuts & Washers Size Range M3 to M100 (Metric) | 1/8" to 4" (Heavy Hex, Jam, Lock Nuts, Flat/Spring Washers)
Governing Specifications ASTM F468 (Bolts/Screws/Studs), ASTM F467 (Nuts), ASTM B164, DIN 931/933/934/912
Dimensional Standards ASME B18.2.1, ASME B18.2.2, ASME B18.3, ASME B18.2.4.6M, DIN, ISO, BS, JIS
Thread Configurations ASME B1.1 Class 2A/3A (Inch Unified UNC/UNF), ASME B1.13M 6g/6H (Metric Coarse/Fine)
Manufacturing Methods Cold Forged (M3–M24), Hot Forged (M20–M100), CNC Bar-Stock Machined
Surface Coatings & Finishes Pickled & Passivated, Plain/Bright, PTFE/Xylan Fluoropolymer Coated, Zinc Flake, Cadmium Plated

Dimensions & Sizes

Nominal Diameter (D) Metric Pitch (Coarse mm) Imperial TPI (UNC) Hex Width Across Flats (F mm / in.) Hex Head Height (H mm / in.) Hex Nut Height (m mm / in.)
M6 / 1/4" 1.00 mm 20 TPI 10.0 mm (0.437") 4.0 mm (0.163") 5.0 mm (0.226")
M8 / 5/16" 1.25 mm 18 TPI 13.0 mm (0.500") 5.3 mm (0.211") 6.5 mm (0.273")
M10 / 3/8" 1.50 mm 16 TPI 17.0 mm (0.562") 6.4 mm (0.243") 8.0 mm (0.337")
M12 / 1/2" 1.75 mm 13 TPI 19.0 mm (0.750") 7.5 mm (0.323") 10.0 mm (0.448")
M16 / 5/8" 2.00 mm 11 TPI 24.0 mm (0.938") 10.0 mm (0.403") 13.0 mm (0.559")
M20 / 3/4" 2.50 mm 10 TPI 30.0 mm (1.125") 12.5 mm (0.483") 16.0 mm (0.665")
M24 / 1" 3.00 mm 8 TPI 36.0 mm (1.500") 15.0 mm (0.627") 19.0 mm (0.887")
M30 / 1-1/4" 3.50 mm 7 TPI 46.0 mm (1.875") 18.7 mm (0.819") 24.0 mm (1.099")
M36 / 1-1/2" 4.00 mm 6 TPI 55.0 mm (2.250") 22.5 mm (0.979") 29.0 mm (1.311")
M42 / 1-3/4" 4.50 mm 5 TPI 65.0 mm (2.625") 26.0 mm (1.139") 34.0 mm (1.523")
M48 / 2" 5.00 mm 4.5 TPI 75.0 mm (3.000") 30.0 mm (1.299") 38.0 mm (1.735")
M64 / 2-1/2" 6.00 mm 4 TPI 95.0 mm (3.750") 40.0 mm (1.619") 51.0 mm (2.159")

Chemical Composition

Element ASTM F468 / UNS N04400 (%) DIN 2.4360 / NiCu30Fe (%)
Nickel (Ni + Co) 63.00 Min 63.00 Min
Copper (Cu) 28.00 – 34.00 28.00 – 34.00
Iron (Fe, Max) 2.50 2.50
Manganese (Mn, Max) 2.00 2.00
Carbon (C, Max) 0.30 0.15
Silicon (Si, Max) 0.50 0.50
Sulfur (S, Max) 0.024 0.020

Mechanical Properties

Material Temper / Condition Tensile Strength (MPa / ksi) Yield Strength 0.2% Offset (MPa / ksi) Elongation in 2 in. (%) Hardness (Rockwell / Brinell)
Annealed (ASTM F468 / F467) 480 – 620 MPa (70 – 90 ksi) 172 – 345 MPa (25 – 50 ksi) 35% – 50% 65 – 85 HRB (110 – 160 HBW)
Cold Worked / Hard Drawn 585 – 760 MPa (85 – 110 ksi) 380 – 585 MPa (55 – 85 ksi) 15% – 30% 85 – 98 HRB (160 – 220 HBW)
Physical Density & Melting Point Density: 8.80 g/cm³ (0.318 lb/in³) Melting Point: 1350°C (2460°F) Modulus of Elasticity: 105–120 kN/mm²
Thermal & Rigidity Properties Coeff. of Expansion: 13.9 µm/m·°C Modulus of Rigidity: 65.3 kN/mm² Service Temp: -200°C to +538°C

Standards & Specifications

Governing Organization Standard Designation Scope & Product Type
ASTM / ASME ASTM F468 / ASME SF468 Standard Specification for Nonferrous Bolts, Hex Cap Screws, and Studs for General Use
ASTM / ASME ASTM F467 / ASME SF467 Standard Specification for Nonferrous Nuts for General Use (UNS N04400)
ASME Standards ASME B18.2.1 / ASME B18.2.2 Square, Hex, Heavy Hex Bolts, Screws, and Hex / Heavy Hex Nuts (Inch Series)
ASME Standards ASME B18.3 / ASME B18.18 Socket Cap, Shoulder, and Set Screws; Fastener Quality Assurance Standards
DIN / ISO Standards DIN 931, 933, 934, 976 / ISO 4014, 4017, 4032 Metric Hexagon Head Bolts, Fully Threaded Screws, Hexagon Nuts, and Threaded Stud Rods
British Standard (BS) BS 4882 / BS 3799 Bolting for Pressure Purposes in Petroleum and Petrochemical Industries
Oil & Gas Standard NACE MR0175 / ISO 15156 Materials for use in H2S-containing environments in oil and gas production

Applications

Monel 400 fasteners are deployed across critical marine, subsea, oil and gas, and chemical processing assemblies:

  • Offshore & Marine Subsea Structures: Riser flange bolting, subsea manifold clamps, hull structural fasteners, dry dock assemblies, and mooring hardware exposed to saline spray.
  • Chemical Processing Plants: Flange bolting for hydrofluoric acid (HF) alkylation reactors, sulfuric acid piping joints, fluorination equipment, and caustic soda storage tanks.
  • Oil & Gas Refineries: Distillation column tray bolting, heat exchanger head studs, wellhead christmas tree bolting, and sour gas gathering pipeline fasteners.
  • Piping Systems & Valve Trims: High-pressure bonnet bolting, pump casing studs, valve actuator fasteners, and pipe clamp U-bolts.
  • Aerospace & Defense: Airframe structural screws, landing gear locking pins, and exhaust hardware subjected to high mechanical vibrations and marine atmospheres.

Frequently Asked Questions

Q1: What is the primary difference between ASTM F468 and ASTM F467 for Monel 400?
ASTM F468 specifies the requirements for non-ferrous externally threaded fasteners such as bolts, studs, and screws (including UNS N04400 Alloy 400), whereas ASTM F467 governs non-ferrous internally threaded fasteners such as hex nuts, jam nuts, and locking nuts.

Q2: Why are Monel 400 fasteners preferred for hydrofluoric (HF) acid alkylation units?
Monel 400 forms a passive nickel-copper fluoride film in non-aerated hydrofluoric acid across all concentrations up to the atmospheric boiling point, preventing rapid stress corrosion cracking and catastrophic thread shearing.

Q3: How do Monel 400 fasteners prevent thread galling during make-up?
Precision-machined or cold-rolled threads combined with anti-galling fluoropolymer coatings (such as PTFE/Xylan), silver plating, or specialized molybdenum-disulfide lubricants ensure consistent make-up torque and smooth break-out without thread seizure.

Q4: What non-destructive and mechanical tests are performed on Monel 400 fasteners?
Fastener lots undergo 100% Positive Material Identification (PMI), tensile proof load testing, wedge tensile testing, Rockwell hardness verification, liquid penetrant testing for head-to-shank defects, and thread gauge pitch verification.

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