Monel 400 Studs Manufacturer & Exporter in India

Explore Monel 400 Studs Manufacturer & Exporter in India manufactured for demanding industrial applications with reliable strength, corrosion resistance and compliance with international standards.

-200

Min Temp

550

Max Temp

🌡

550

Suitable for continuous service up to approximately 550°C under typical operating conditions.

⚡

550

Typical tensile strength around 550 MPa depending on product form and heat treatment.

🛡

Excellent

Excellent corrosion resistance in a wide range of industrial environments.

⚖

8.8

Typical density is approximately 8.8 g/cm³.

Product Overview

What are Monel 400 Studs?

Monel 400 studs are nickel-copper alloy fasteners manufactured from UNS N04400 bar stock conforming to ASTM B164. The alloy’s single-phase solid-solution structure – comprising 63-70% nickel and 28-34% copper – delivers a minimum tensile strength of 482 MPa in the annealed condition, with excellent toughness retained at cryogenic temperatures down to -196°C.

Monel 400 studs resist corrosion in seawater, hydrofluoric acid, and alkaline media at a level no standard stainless steel can replicate. They are specified under NACE MR0175/ISO 15156 for sour-service piping systems, marine pump shafts, and chemical process flanges where chloride stress corrosion cracking of austenitic stainless steel is a documented failure mode.

Quick Specifications

Material	Monel 400
UNS Number	N04400
DIN Number	2.4360
Material Standard	ASTM B164
Stud Standard (Metric)	DIN 938 / DIN 939 / ISO 4032
Stud Standard (Inch)	ASME B18.31.2 / ASME B16.5
Thread Form	ISO Metric / UNC / UNF
Diameter Range	M6-M100 / ¼"-4"
Tensile Strength	482 MPa (70 ksi) min
Yield Strength	193 MPa (28 ksi) min
Hardness	Max 35 HRC / 241 HB

? All material certified by NABL-accredited laboratory. PMI available on request.

Complete the Fastener Set

Other Monel 400 Fastener Products Available from RealBolt

RealBolt also manufactures the complete Monel 400 fastener range from certified nickel-copper alloy bar stock, including Monel 400 Bolts, Monel 400 Nuts, Monel 400 Screws, Monel 400 Washers, and Monel 400 Threaded Rods. All Monel 400 fastener types are produced to ASTM with full EN 10204 MTC 3.1/3.2 documentation.

Monel 400 Bolts

Monel 400 Nuts

Monel 400 Screws

Monel 400 Washers

Monel 400 Threaded Rods

Technical Data

Monel 400 Studs Dimensions, Sizes & Thread Standards

Monel 400 Studs are available in metric M6–M100 and inch ¼″–4″ as standard. Per DIN 938 (one-end stud) / DIN 939 (stud bolt) / ASME B16.5 (flange stud bolts). Custom lengths in 5mm increments. Inch dimensions available per ASME B18.31.2. All Monel 400 studs dimensions conform to applicable DIN, ISO, and ASME B18 standards.

Stud Bolt Dimensions - Metric (DIN 938 / DIN 939)

Size (M)	Pitch (mm)	Shank Dia (mm)	Thread Length b1 (mm)	Min L (mm)	Max L (mm)
M6	1.0	6.0	9	20	200
M8	1.25	8.0	12	25	250
M10	1.5	10.0	15	30	300
M12	1.75	12.0	18	35	400
M16	2.0	16.0	24	45	500
M20	2.5	20.0	30	55	600
M24	3.0	24.0	36	65	700
M30	3.5	30.0	45	80	900
M36	4.0	36.0	54	100	1000
M42	4.5	42.0	63	120	1200
M48	5.0	48.0	72	140	1500
M56	5.5	56.0	84	160	1800
M64	6.0	64.0	96	180	2000
M72	6.0	72.0	108	200	2200
M80	6.0	80.0	120	220	2500
M100	6.0	100.0	150	250	3000

Dimensional & Material Standards

Standard	Covers	Thread
DIN 938	Studs, one-end engagement	Metric
DIN 939	Studs, both-end engagement	Metric
ISO 4032	Hex nuts for studs	Metric
ASME B18.31.2	Continuous thread studs	UNC/UNF
ASME B16.5	Stud bolts for flanges	UNC
MSS SP-75	Stud bolts, high-pressure	UNC
ASME B16.47	Large diameter flange studs	UNC

Material Standard	Requirement
ASTM B164	Bar/rod - UNS N04400
ASTM F467	Fastener nuts - nickel alloy
NACE MR0175	Sour service =35 HRC
EN 10204 3.1	Mill test certificate
EN 10204 3.2	TPI-witnessed MTC

Material Chemistry

Monel 400 Chemical Composition

Monel 400 Studs are produced from a nickel-copper alloy containing 63% minimum nickel and 27–34% copper, with elemental limits certified to ASTM. The nickel base delivers seawater and HF acid immunity; copper additions enhance ductility; and in Monel K500, aluminium and titanium additions enable age-hardened strength above 896 MPa.

Chemical Composition per ASTM B164

Element	Composition (%)
Nickel (Ni)	63.0% min
Copper (Cu)	28.0-34.0%
Iron (Fe)	2.5% max
Manganese (Mn)	2.0% max
Carbon (C)	0.30% max
Silicon (Si)	0.50% max
Sulfur (S)	0.024% max

? All heats verified by NABL-accredited spectrometry. PMI available on request.

Why Monel 400 Alloy Composition Matters for Studs

Ni-Cu Balance (63% Ni min) — Seawater & HF Acid Immunity

The high nickel-copper ratio gives Monel 400 outstanding resistance to seawater corrosion across all velocities, including under stud thread roots and nut bearing faces where crevice conditions develop. It is one of very few alloys that resists anhydrous hydrofluoric acid at all concentrations.

Low Carbon (0.30% max) — Weld HAZ Integrity

The controlled carbon ceiling prevents intergranular carbide precipitation in the heat-affected zone when Monel 400 studs are welded into assemblies or used in high-temperature flanged joints, preserving corrosion resistance without post-weld heat treatment in most applications.

Single-Phase Solid Solution — No Sensitisation Risk

Unlike duplex or austenitic stainless steels, Monel 400 has no secondary phase to sensitise. Studs retain full mechanical properties and corrosion resistance after thermal cycling between -196°C and 480°C, making them reliable in cryogenic LNG service and steam-traced piping alike.

Fastener Performance

Monel 400 Studs Mechanical Properties & Torque Reference

The table below lists mechanical properties and torque reference for Monel 400 Studs per ASTM. Monel 400 studs achieve 550 MPa tensile strength, with hardness, yield, and elongation values verified by NABL-accredited testing and reported in the EN 10204 MTC.

Tightening Torque Reference - Monel 400 Studs

Stud Size	Dry (Nm)	Lubricated (Nm)	Clamp Load (kN)
M12	52	42	19
M16	125	100	46
M20	245	196	73
M24	425	340	106
M30	850	680	168
M36	1480	1184	244
M42	2360	1888	337
M48	3500	2800	443

?? Anti-galling: Use nickel-based anti-seize (Molykote P-37 or Bostik Never-Seez Pure Nickel). Lubricated values assume K=0.15. Never use copper-based anti-seize on nickel-copper alloys - galvanic incompatibility accelerates thread corrosion.

Industry Applications

Monel 400 Studs Applications — Industries & End Uses

Monel 400 Studs from RealBolt are specified across marine, HF alkylation, desalination, and chemical processing where excellent corrosion resistance and 550 MPa tensile strength are required for reliable fastener performance. Click each industry below for detailed application examples. Select an industry below to see specific Monel 400 studs application details and RealBolt stock availability.

Oil & Gas - HF Alkylation & Sour Service

Monel 400 stud bolt sets are the industry-standard specification for hydrofluoric acid alkylation unit piping flanges, where no other common alloy survives anhydrous HF at process concentrations. Also specified for NACE MR0175-compliant sour-service flanged connections in wellhead and production manifold assemblies where H2S partial pressure exceeds NACE threshold limits.

Marine & Offshore Structures

Stud bolts and continuous thread studs for seawater pump casings, propeller shaft brackets, sea chest valve flanges, and offshore platform structural connections in the splash zone. Monel 400 resists biofouling-induced crevice corrosion under nut bearing faces without cathodic protection, outperforming super duplex stainless steel in stagnant seawater crevice conditions.

Chemical & Petrochemical Processing

Flange stud bolt sets for sulfuric acid concentration units, caustic soda evaporators, chlorinated solvent process vessels, and hydrochloric acid storage tank nozzle connections. Monel 400 studs are specified where 316L stainless steel fails by pitting or stress corrosion cracking in halide-bearing process streams.

Desalination & Water Treatment

Stud bolts for multi-stage flash (MSF) and reverse osmosis (RO) pressure vessel end-cap closures, brine heater tube sheet flanges, and high-pressure pump casing joints. Monel 400 resists chloride-laden brine at elevated temperatures where titanium fasteners are cost-prohibitive and stainless steel is susceptible to pitting.

Monel 400 Studs Standards & International Certifications

Monel 400 Studs from RealBolt Engineering Industries are manufactured to internationally recognised fastener dimensional standards covering thread form, tolerances, strength grades, and quality requirements. Every batch ships with EN 10204 MTC 3.1/3.2, Lloyds Register or DNV certification, NACE MR0175, and PMI (XRF) reports — available on request for all orders.

Standards

DIN 938 DIN 939 DIN 976-1 ASME B18.31.2 BS 1768 IS 1364 IS 1367

Certifications

ISO 9001:2015NACE MR0175NABL LabPED 2014/68/EUMTC 3.1 / 3.2

Buy Monel 400 Studs from India's Leading Manufacturer — Get a Competitive Quote Today

Partner with RealBolt — India’s leading manufacturer of certified Monel 400 Studs — for competitive pricing, EN 10204 MTC 3.1/3.2 documentation, and fast Mumbai dispatch. Standard sizes are ex-stock; custom dimensions accepted with 2–3 week lead time. Request your quote today.

Answers for Buyers

Monel 400 Studs — Frequently Asked Questions

Browse expert answers to common questions about Monel 400 Studs from RealBolt — covering Monel 400 vs K500 selection, seawater and HF acid resistance, ASTM B164/B865, sizes, and MTC documentation. Contact our technical team directly for project-specific guidance on Monel 400 studs selection and pricing.

What stud standards are available for Monel 400 studs?

Monel 400 studs are manufactured to DIN 938 (one-end engagement metric studs), DIN 939 (both-end engagement metric studs), ASME B18.31.2 (continuous thread studs, inch), and ASME B16.5 / B16.47 for flange stud bolt sets in Class 150 through Class 2500. Custom thread forms including BSW, BSF, and BSPP are available on request with a 15 working day lead time. All studs are supplied with matching Monel 400 heavy hex nuts per ASTM F467 unless otherwise specified.

What anti-seize compound should I use on Monel 400 studs?

Use nickel-based anti-seize compound (Molykote P-37, Bostik Never-Seez Pure Nickel, or Jet-Lube KOPR-KOTE Pure Nickel). Apply to both threaded ends and nut bearing faces before assembly. Reduce torque values by approximately 20% compared to dry assembly values. Never use copper-based anti-seize on Monel 400 – the copper content in the anti-seize creates a galvanic cell with the nickel-copper alloy matrix and accelerates corrosion at the thread interface, particularly in wet or immersed service.

Are Monel 400 studs suitable for hydrofluoric acid service?

Yes – Monel 400 is one of the very few commercially available alloys with proven resistance to anhydrous and aqueous hydrofluoric acid across all concentrations at ambient and elevated temperatures. Monel 400 stud bolt sets are the standard specification for HF alkylation unit piping flanges in petroleum refining, as documented in NACE Publication 5A171 and API RP 751. No special coating is required. Studs must be in the annealed condition with hardness below 35 HRC per NACE MR0175 for sour-service concurrent exposure.

Can Monel 400 studs be used at cryogenic temperatures?

Yes – Monel 400 retains full ductility and impact toughness at temperatures down to -196°C (liquid nitrogen temperature) without any ductile-to-brittle transition, which is a characteristic failure mode of ferritic and martensitic steels. Monel 400 studs are specified for LNG plant cold box flange connections, cryogenic valve bonnets, and liquid nitrogen storage vessel nozzle flanges. No special low-temperature impact testing (Charpy) is required for Monel 400 at cryogenic service temperatures under most pressure vessel codes.

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