Monel 400 Fasteners Supplier– ASTM F467 / UNS N04400

Table of Content

Introduction to Monel 400 Fasteners
ASTM F467, ASME SF 467 & ASTM B164 Specifications
Chemical Properties of Monel 400 Fasteners
Mechanical Properties of Alloy UNS N04400 Fasteners
400 Monel Alloy Fasteners Equivalent Grades
Available Types of Monel 400 Fasteners
Size Range & Dimensions
Manufacturing Standards & Thread Types
Monel 400 Fasteners Applications & Industries Served
Testing of Monel 400 Fasteners
Frequently Asked Questions

ISO 9001:2015 certified manufacturer of ASTM F467 Monel 400 bolts, stud bolts, nuts, screws, and washers in UNS N04400 / DIN 2.4360. M3–M160 metric, ¼″–4″ imperial. Ex-stock Mumbai — 24–48 hr dispatch. Zero MOQ.

ISO 9001:2015 Certified
PED 2014/68/EU
EIL Approved Manufacturer EN 10204 3.1 MTC NACE MR0175 Zero MOQ Policy
50+ Export Countries

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Introduction to Monel 400 Fasteners

Kalpataru Piping Solutions is an Indian Monel 400 fasteners supplier and exporter, an international-certified manufacturer of fasteners offering solutions against corrosion. We produce our Monel 400 hex bolts, UNS N04400 fasteners, and DIN 2.4360 studs with the same UNS N04400 / WNR 2.4360 alloy, which is a nickel-copper superalloy that provides superior corrosion behavior in seawater, acids, alkalis, and additional corrosive environments. Mechanical and chemical data of UNS N04400 fasteners are summarised in the specification tables below.

Certifications & Approvals

ISO 9001:2015

Quality management system certified, governing all manufacturing, inspection, and dispatch processes from raw material receipt to final shipment.

PED 2014/68/EU

Pressure Equipment Directive compliance for fasteners supplied into European pressure systems, mandatory for EU EPC contractors and end-users.

EIL Approved Manufacturer

Engineers India Limited approved, a key pre-qualification credential for refinery and petrochemical project procurement in India.

NACE MR0175 / ISO 15156

Qualified for sour service H₂S environments, required for upstream oil & gas, wellhead, and subsea fastener applications.

EN 10204 3.1 MTC

Third-party witnessed material test certificates supplied as standard with every order, required by European and Middle East EPC contractors.

NABL Approved Lab Reports

Chemical analysis, mechanical testing, and hardness reports from NABL-accredited laboratories provided on request for critical applications.

In our inventory we maintain a full range of ASTM F467 Monel 400 nuts, bolts, screws, washers, studs, and other machined items, to ASTM B164, ASTM F467, ASTM F468, and ASME SF467. The procurement teams around the world source our flanges and fasteners in unison: see our Monel 400 Flanges (ASTM B564 / UNS N04400) page to complete the flanging solution.

ASTM F467, ASME SF467 & ASTM B164 – Specifications

Monel 400 fasteners are manufactured to ASTM F467, ASTM B164, and ASTM F468, ensuring consistent performance in critical applications. Dimensional tolerances conform to DIN, ASTM, BS, and ISO standards for interchangeability across industrial systems.

Parameter	Details
Material Specifications	ASTM F467, ASME SF467, ASTM B164, ASTM F468
Standards	ASTM, ASME, DIN, ISO, BS, JIS, IS, GB, UNI
Metric Sizes	M2, M3, M4, M5, M6, M8, M10, M12, M14, M16, M18, M20, M22, M24, M27, M30, M33, M36, M39, M42, M45, M48, M52, M56 to M160
Imperial Sizes	¼″, 5⁄16″, ⅜″, 7⁄16″, ½″, 5⁄8″, ¾″, ⅞″, 1″, 1-⅛″, 1-¼″, 1-⅜″, 1-½″, 1-¾″, 2″, 2-¼″, 2-½″, 3″, 4″
Length Range	3 mm to 200 mm standard \| up to 1,500 mm CNC machined
Fastener Types	Bolts, Nuts, Screws, Washers, Studs, Threaded Rods, Pins, Rivets, U-Bolts, Eye Bolts
Thread Types	UNC, UNF, BSW, BSF, Metric, 8UN, NPT, NPTF
Manufacturing Process	Hot Forging (M24–M100), Cold Forging (M2–M24), CNC Machining (custom up to 4″ dia)
Head Drive Types	Hex, Phillips, Slotted, Six-Lobe (Torx), Socket (Allen)
HS Code	73181500

DIN 2.4360 Fasteners – European Standard (Werkstoff Nr. 2.4360)

European and Middle Eastern procurement teams frequently specify DIN 2.4360 fasteners, the Werkstoff designation for Monel Alloy 400 under DIN 931, DIN 933, DIN 934, and related DIN standards. Our facility manufactures and certifies Werkstoff Nr. 2.4360 fasteners with EN 10204 3.1 MTC and PED 2014/68/EU compliance, making them directly usable in European pressure system projects without re-certification.

DIN Standard	Fastener Type	Coverage
DIN 931 / DIN 933	Hex Bolts (partial / full thread)	General hex head bolts, most common DIN bolt standard
DIN 934	Hex Nuts	Standard hex nuts, all metric sizes
DIN 912	Socket Head Cap Screws	Allen key drive cap screws
DIN 975 / DIN 976	Threaded Rods / Studs	Fully threaded rods and stud bolts
DIN 125 / DIN 127	Washers (plain / spring)	Flat and spring lock washers
DIN 985 / DIN 6923	Nyloc Nuts / Flange Nuts	Self-locking and flange-bearing nuts
DIN 580 / DIN 582	Eye Bolts / Eye Nuts	Lifting and rigging applications

Chemical Composition & Mechanical Properties of UNS N04400 Fasteners

Alloy	Ni (min)	Cu	Fe (max)	Mn (max)	C (max)	Si (max)	S (max)
Monel 400 / UNS N04400	63.00%	28.0–34.0%	2.5%	2.0%	0.3%	0.5%	0.024%

Mechanical Properties

Tensile Strength (Annealed)	517–620 MPa (75–90 ksi)
Yield Strength (0.2%)	172–345 MPa (25–50 ksi)
Elongation	35–48%
Hardness	110–150 HB / 60–85 HRB
Temperature Range	−34°C to 538°C (−30°F to 1000°F)
Typical Service Life	25–35 years

Physical Properties

Density	8.80 g/cm³ (0.318 lb/in³)
Melting Point	1300–1350°C (2370–2460°F)
Modulus of Elasticity	179 GPa (26,000 ksi)
Poisson’s Ratio	0.32
Impact Strength (Charpy)	200–300 J

Available Types of Monel 400 Fasteners

We stock and supply all standard Monel 400 fastener types, from common hex hardware to precision-machined custom components. Our Monel 400 stud bolts are sized to ASME B16.5 flange dimensions and supplied alongside our Monel 400 Flanges for complete flanged joint packages.

Monel 400 Bolts

Monel 400 Hex Bolts

The most widely specified fastener type for marine, offshore, and chemical process pipework. Available in full thread (DIN 933) and partial thread (DIN 931) configurations, in UNC, UNF, and metric thread forms from M6 to M160 / ¼″ to 4″.

Monel 400 Stud Bolts

Primary fastener for Monel 400 flanged pipe joints. Supplied to ASME B16.5 flange dimensions (Class 150–2500) with 2B thread tolerance and chamfered ends.

Heavy Hex Bolts

Larger across-flats dimensions than standard hex bolts, providing greater bearing area for heavy structural and pressure vessel connections.

Eye Bolts & U-Bolts

DIN 580 / DIN 582 eye bolts for rigging and lifting. U-bolts for pipe clamp and structural support in marine and chemical environments.

Monel 400 Nuts

Hex Nuts & Heavy Hex Nuts

Standard (DIN 934) and heavy hex nuts for flanged and structural connections. Heavy hex nuts provide increased bearing face for high-strength stud bolt applications.

Lock Nuts / Nyloc & Wing Nuts

DIN 985 nyloc lock nuts for vibration-resistant connections on machinery and equipment. Wing nuts allow tool-free manual assembly and disassembly during maintenance.

Coupling, Cap & Flange Nuts

Coupling nuts (DIN 6334) for extending threaded rods. Cap nuts (DIN 1587) protect exposed threads. Flange nuts (DIN 6923) provide built-in washer face.

Assembly Supply

Supplied paired with matching Monel 400 stud bolts for complete flange assembly packages in marine and petrochemical applications.

Monel 400 Screws, Washers & Threaded Rods

Socket Head Cap Screws

ASME B18.3 Allen-key drive screws for confined-space installations on valve bodies, instrument fittings, and compact assemblies.

Machine Screws & Set Screws

Precision screws for instrument assemblies and equipment housings. DIN 913/914 set screws available in multiple point styles for locking.

Flat & Spring Washers

DIN 125 flat washers for load distribution and DIN 127 spring washers for vibration resistance in dynamic applications.

Threaded Rods

Fully threaded rods (DIN 975) and stud-length rods to ASME B16.5 for flange joint assembly in piping systems.

Download Complete Technical Data

Monel 400 Stud Bolts – ASME B16.5 Flange Dimensions

Monel 400 stud bolts are specified by pipe size, pressure class, and flange facing. The table below covers Class 150 raised face (RF) stud lengths per ASME B16.5. For full stud bolt dimension tables across all classes (150–2500), contact our technical team or request the dimensional data sheet. Also see our ASTM B564 Monel 400 Flanges to pair matching flanges and fasteners in one order.

Pipe Size (NPS)	No. of Bolts	Bolt Diameter	Stud Length (RF, Class 150)
½″	4	½″	2¼″
1″	4	½″	2½″
2″	4	5⁄8″	3¼″
3″	4	5⁄8″	3½″
4″	8	5⁄8″	3½″
6″	8	¾″	4″
8″	8	¾″	4¼″
10″	12	⅞″	4½″
12″	12	⅞″	4¾″

Monel 400 vs Monel K500 Fasteners – Which Grade Do You Need?

The most common material selection question for nickel-copper alloy fasteners is whether to specify Monel 400 or Monel K500. The answer depends on your mechanical load requirements and whether your application involves high wear, galling, or elevated strength demands alongside corrosion resistance.

Property	Monel 400 (UNS N04400)	Monel K500 (UNS N05500)
Tensile Strength	517–620 MPa	900–1100 MPa (age hardened)
Yield Strength	172–345 MPa	620–790 MPa
Heat Treatment	Not required	Requires age hardening
Cost	Lower	Higher (30–50% premium)
Best For	Chemical, marine, acid service, flanged joints, general corrosion-resistant fastening	Marine shafting, pump components, valve stems, high-load structural fasteners, wear-resistant applications

If your specification does not require elevated strength or wear resistance, Monel 400 provides the most cost-effective corrosion-resistant solution. See our Monel K500 Fasteners page for age-hardened high-strength options, and our Monel 400 vs Inconel 625 selection guide for alloy comparison against Inconel grades.

Monel 400 Fasteners vs Stainless Steel – Performance Comparison

The lifecycle cost argument for specifying Monel 400 over stainless steel is compelling in marine and acid service — where SS 304 and SS 316 fasteners fail by pitting and stress corrosion cracking within 5–15 years.

Property	Monel 400	SS 304	SS 316
Seawater Resistance	Excellent	Poor (pitting)	Fair (pitting)
Hydrofluoric Acid (all concentrations)	Excellent	Poor	Poor
Sulfuric Acid (dilute)	Excellent	Good	Good
Chloride Stress Corrosion Cracking	Immune	Susceptible	Resistant
Strength at Elevated Temp (to 538°C)	Good	Good (to 870°C)	Good (to 870°C)
Relative Cost	Higher upfront	Lower	Moderate
Service Life in Marine Service	25–35 years	5–10 years	10–15 years

Monel 400 Fasteners for Marine & Offshore Applications

Monel 400 fasteners are the material of choice for marine and offshore installations where no other alloy provides the same combination of seawater immunity, HF/HCl acid resistance, and chloride SCC immunity at comparable cost. Key applications include:

Oil & Gas Offshore Platforms
Wellhead fasteners, Christmas tree bolting, subsea manifold hardware, riser clamps, and sour gas service components per NACE MR0175 / ISO 15156.
Marine Shipbuilding
Seawater piping flanges, heat exchanger bolting, propulsion system fasteners, deck hardware, and salt water tank internals.
Desalination Plants
MSF and RO plant seawater intake bolting, brine heater fasteners, high-pressure membrane frame hardware, and concentrate line flanges.
Chemical & HF Acid Service
HF acid alkylation unit fasteners, chlorine production equipment bolting, caustic soda system hardware, and chemical reactor vessel studs.
Refineries & Petrochemical
Crude petroleum still fasteners, gas scrubbing tower bolting, EIL-approved project supply for Indian refinery and petrochemical projects.
Power Generation
Condenser fasteners, boiler feed water heater bolting, steam turbine component studs, and heat exchanger tube sheet hardware.

For the pipe, flange, and fitting components that connect to these fasteners, see our Monel 400 Pipes & Tubes and Monel 400 Forged Fittings pages.

Chemical Resistance of Monel 400 Fasteners

UNS N04400 fasteners exhibit excellent resistance to the following chemicals and environments:

Chemical / Environment	Resistance	Notes
Seawater & Brackish Water	Excellent	All concentrations and temperatures — immune to pitting
Hydrofluoric Acid (HF)	Excellent	All concentrations — superior to virtually all alloys
Sulfuric Acid	Excellent	Up to 80% concentration at ambient temperatures
Phosphoric Acid	Good	Various concentrations in process conditions
Sodium / Potassium Hydroxide	Excellent	Alkaline service including caustic soda systems
Organic Acids (acetic, fatty acids)	Good–Excellent	Food, pharma, and chemical processing
Neutral & Alkaline Salt Solutions	Excellent	Brine and saline service
Hydrogen Chloride Gas	Good	Dry and moist HCl gas environments
Hydrochloric Acid (HCl, liquid)	Good	Dilute concentrations at ambient temperature; limited above 5% or elevated temp
Crude Petroleum & Naphtha	Excellent	Refinery and upstream production service
Sour Gas (H₂S)	Excellent	NACE MR0175 compliant — qualified for sour service

Testing & Quality Certification of Monel 400 Fasteners

Every lot of ASTM F467 Monel 400 fasteners from Kalpataru Piping Solutions undergoes comprehensive destructive and non-destructive quality testing before dispatch. Our testing capability is why EIL-approved projects and EN 10204 3.1-specified contracts choose us.

Non-Destructive Testing (NDT)

Ultrasonic Testing (UT) — Standard
Liquid Penetrant (Dye PT) — Standard
PMI (Positive Material ID) — Standard
Visual & Dimensional — 100% Inspection

Destructive Testing

Tensile & Yield Strength — Per heat
Elongation Testing — Per heat
Hardness (Rockwell / Brinell) — Per heat
Impact (Charpy V-Notch) — On request
Chemical Analysis (Wet Lab) — NABL Lab

Test Certificates & Documentation

Certificate Type	Standard	Availability
Manufacturer’s Test Certificate (MTC)	EN 10204 3.1	Standard with all orders
Mill Test Certificate	ASTM / ASME	Standard with all orders
Third Party Inspection (TPI)	Bureau Veritas / SGS / Lloyds	On request
NABL Approved Lab Reports	NABL Accredited	On request
Heat / Lot Traceability Report	—	Standard with all orders

Indicative Price Range – Monel 400 Fasteners (FOB Mumbai)

Pricing for Monel 400 fasteners is driven by raw material cost (LME Nickel index), order quantity, and specification complexity. The table below provides indicative FOB Mumbai pricing. Prices are updated monthly in line with LME Nickel movements. Contact our sales team for current pricing and bulk discount tiers.

Product Type	Size Range	Approx. Price (USD / piece)
Monel 400 Hex Bolts	M6 to M12	$5.50 – $7.50
Monel 400 Hex Bolts	M16 to M24	$12.00 – $25.00
Monel 400 Hex Nuts	M6 to M12	$1.35 – $2.50
Monel 400 Socket Cap Screws	M6 to M12	$3.25 – $4.50
Monel 400 Stud Bolts	M10 to M20	$8.00 – $18.00
Monel 400 Washers	M6 to M20	$0.50 – $2.00

Prices are indicative and subject to change based on raw material costs, quantity, and specifications. Zero MOQ policy — no minimum order required. Contact us for current pricing and volume discounts.

Why Choose Kalpataru Piping Solutions – Monel 400 Fasteners Supplier India

With 15+ years of manufacturing experience, ISO 9001:2015 and PED certification, and EIL approval, Kalpataru Piping Solutions is a trusted Monel 400 fasteners supplier for marine, oil & gas, chemical, and petrochemical project teams across 50+ countries.

Zero MOQ & Ex-Stock

Standard M6–M56 sizes available for 24–48 hour dispatch from our Mumbai warehouse. No minimum order, from single pieces to full tonnage supply.

In-House CNC Machining

Custom CNC machined fasteners up to M100 / 4″ diameter and 1,500 mm length with head marking, thread locking, and coating processes handled in-house.

Complete Documentation

EN 10204 3.1 MTC, NABL lab reports, PMI certificates, TPI reports, and full heat traceability for QA/QC compliance.

Global Logistics Network

Proven export supply to UAE, Saudi Arabia, Qatar, UK, Germany, USA, Singapore, Australia, and 40+ countries with export-grade packaging.

Competitive Pricing

Bulk discounts, long-term contract pricing, and project-specific quotations directly from the manufacturer with no intermediary markup.

Technical Support

Dedicated support for material selection, specification review, and Monel 400 vs K500 comparison with no pre-sales cost.

Frequently Asked Questions

What is the difference between Monel 400 and Monel K500?

Monel 400 (UNS N04400) is less expensive and is the standard material employed in marine, chemical and acid service. Monel N05500 (UNS K500) is age hardened to provide tensile strengths of 900-1100 Mpa, which is appropriate in applications with high-load bearing like marine shafting, pump parts and valve stems. Monel K500 is generally costing 30-50 percent higher than Monel 400.

What are the standards of Monel 400 fasteners?

Kalpataru Monel 400 fasteners are made to ASTM F467, ASME SF467, ASTM B164 and ASTM F468. The DIN counterpart of the equivalent DIN 2.4360 designation used by European procurement groups may be specified in DIN 931, DIN 933, DIN 934 and further DIN rules. Each order contains EN 10204 3.1 certificates of material testing.

What is the operating temperature of Monel 400 fasteners?

The fasteners Monel 400 (UNS N04400) can withstand mechanical integrity at [?]34degC to 538degC ([?]30degF to 1000degF) and can therefore be used in both cryogenic and high temperature process applications.

Can monel 400 fasteners be used in seawater service?

Yes. Monel 400 fasteners show high resistant to seawater and brackish water of all concentrations and temperatures, are immune to pitting and chloride stress corrosion cracking. Marine service life is normally 25 years to 35 years, whereas SS 304 and SS 316 ranges are 5 to 10 years and 10 to 15 years, respectively.

What are the certifications that Kalpataru Piping Solutions has on Monel 400 fasteners?

Kalpataru Piping Solutions is qualified and certified to ISO 9001:2015 and is in compliance with the PED 2014/68/EU and the EIL approved and the NACE MR0175 / ISO 15156. All orders include EN 10204 3.1 MTC. NABL laboratory reports, TPI by Bureau Veritas, SGS or Lloyds can be requested.

Which is the minimum quantity of fasteners Monel 400 that should be ordered?

Minimum order quantity does not exist. Standard sizes of M6-M56 are in ex-stock in Mumbai and can be dispatched 24-48 hours. Single piece to full project tonnage orders are taken.

What is the HS code on Monel 400 fasteners?

The Monel 400 fasteners (bolts, nuts, screws, washers, and studs) Hs code is 73181500.

Are Monel 400 fasteners serviceable in HF acid (hydrofluoric acid)?

Yes. Monel 400 is very resistant to hydrofluoric acid of all concentrations and therefore it is the material of choice when it comes to fastener material used in HF acid alkylation units and chlorine production equipment. The stainless steel grades are inapplicable as substitutes HF acid service.

Complete Your Monel 400 Piping System

Every flanged joint requires both fasteners and flanges — and every piping system requires pipes, fittings, and additional hardware. Source your complete Monel Alloy 400 bill of materials from one certified, EIL-approved supplier:

Monel 400 Flanges (ASTM B564)

Monel 400 Pipes & Tubes

Monel 400 Buttweld Fittings

Monel 400 Forged Fittings

Monel 400 Olets

Monel K500 Fasteners

All Monel Fasteners

Monel 400 vs Inconel 625 – Guide

Request a Quote – Monel 400 Fasteners

Contact us for current pricing, EN 10204 3.1 test certificates, dimensional drawings, and lead times on all ASTM F467 UNS N04400 fastener types and sizes. ISO 9001 certified, EIL approved. Technical team responds within 24 hours.