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Monel K500 Bolts Manufacturer & Exporter in India

Explore Monel K500 Bolts Manufacturer & Exporter in India manufactured for demanding industrial applications with reliable strength, corrosion resistance and compliance with international standards.
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-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 K500 Bolts?

Monel K500 bolts are nickel-copper alloy fasteners manufactured from UNS N05500 bar stock conforming to ASTM B865. The alloy combines the excellent corrosion resistance of Monel 400 with significantly enhanced mechanical strength achieved through precipitation hardening via additions of aluminium (2.30-3.15%) and titanium (0.35-0.85%), which form the Ni3(Al,Ti) gamma-prime phase during age hardening.

With a minimum tensile strength of 1100 MPa in the age-hardened condition, Monel K500 bolts outperform standard Monel 400 by nearly double in yield strength while retaining full resistance to seawater corrosion, hydrofluoric acid, and chloride-bearing environments. These fasteners are specified under NACE MR0175/ISO 15156 for offshore wellhead assemblies, pump shafting flanges, and marine propulsion systems where both high strength and corrosion immunity are simultaneously required.

Quick Specifications

MaterialMonel K500
UNS NumberN05500
DIN Number2.4375
Material StandardASTM B865
Bolt Standard (Metric)DIN 931 / DIN 933 / ISO 4014
Bolt Standard (Inch)ASME B18.2.1
Thread FormISO Metric / UNC / UNF
Diameter RangeM6-M100 / ¼"-4"
Tensile Strength1100 MPa (160 ksi) min
Yield Strength790 MPa (115 ksi) min
HardnessMax 35 HRC / 330 HB
? All material certified by NABL-accredited laboratory. PMI available on request.

Complete the Fastener Set

Other Monel K500 Fastener Products Available from RealBolt

RealBolt also manufactures the complete Monel K500 fastener range from certified nickel-copper alloy bar stock, including Monel K500 Nuts, Monel K500 Screws, Monel K500 Washers, Monel K500 Studs, and Monel K500 Threaded Rods. All Monel K500 fastener types are produced to ASTM with full EN 10204 MTC 3.1/3.2 documentation.
Monel K500 Nuts
Monel K500 Screws
Monel K500 Washers
Monel K500 Studs
Monel K500 Threaded Rods

Technical Data

Monel K500 Bolts Dimensions, Sizes & Thread Standards

Monel K500 Bolts are available in metric M6–M100 and inch ¼″–4″ as standard. Per DIN 931 (partial thread) / DIN 933 (full thread) / ISO 4014. Custom lengths in 5mm increments. Inch dimensions available per ASME B18.2.1. All Monel K500 bolts dimensions are verified against applicable DIN, ISO, and ASME

Hex Bolt Dimensions - Metric (DIN 931 / ISO 4014)

Size (M)Pitch (mm)A/F (mm)Head Ht (mm)Min L (mm)Max L (mm)
M61.0104.010200
M81.25135.312250
M101.5176.416300
M121.75197.520400
M162.02410.025500
M202.53012.530600
M243.03615.040600
M303.54618.750800
M364.05522.5601000
M424.56526.0801000
M485.07530.01001200
M565.58535.01201500
M646.09540.01402000
M726.010545.01602000
M806.011550.01802500
M1006.014563.02003000

Dimensional & Material Standards

StandardCoversThread
DIN 931Hex bolts, partial threadMetric
DIN 933Hex bolts, full threadMetric
ISO 4014Hex head screws, partialMetric
ISO 4017Hex head screws, fullMetric
ASME B18.2.1Hex & heavy hex boltsUNC/UNF
ASME B16.5Stud bolts for flangesUNC
MSS SP-75Stud bolts, high-pressureUNC
Material StandardRequirement
ASTM B865Bar/rod - UNS N05500
ASTM F468Fastener mechanical properties
NACE MR0175Sour service =35 HRC
EN 10204 3.1Mill test certificate
EN 10204 3.2TPI-witnessed MTC

Material Chemistry

Monel K500 Chemical Composition

Monel K500 Bolts 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 B865

ElementComposition (%)
Nickel + Cobalt (Ni+Co)63.0% min
Copper (Cu)27.0-33.0%
Aluminium (Al)2.30-3.15%
Titanium (Ti)0.35-0.85%
Iron (Fe)2.0% max
Manganese (Mn)1.5% max
Carbon (C)0.25% max
Silicon (Si)0.50% max
Sulphur (S)0.010% max
? All heats verified by NABL-accredited spectrometry. PMI available on request.

Why Monel K500 Alloy Composition Matters for Bolts

Al + Ti (2.30–3.15% / 0.35–0.85%) — Precipitation Hardening
Aluminium and titanium combine during age hardening to precipitate the Ni3(Al,Ti) gamma-prime phase, raising tensile strength to 1100 MPa minimum — nearly double that of annealed Monel 400. This makes Monel K500 bolts suitable for high-load flange connections where standard nickel alloy fasteners would yield under preload.
Cu (27–33%) — Seawater & Acid Corrosion Resistance
The high copper content gives Monel K500 outstanding resistance to seawater, hydrofluoric acid, and reducing acid environments. Unlike stainless steels, Monel K500 bolts do not suffer pitting or crevice corrosion under bolt head bearing surfaces in marine immersion service, making them the preferred choice for offshore structural connections.
Low Fe & S — Non-Magnetic in Aged Condition
Monel K500 is essentially non-magnetic in the annealed state and exhibits very low magnetic permeability even after age hardening, making it suitable for minesweeper fittings, compass binnacle hardware, and sensitive instrumentation enclosures where magnetic interference must be minimised.

Fastener Performance

Monel K500 Bolts Mechanical Properties & Torque Reference

The table below lists mechanical properties and torque reference for Monel K500 Bolts per ASTM. Monel K500 bolts 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 K500 Hex Bolts (Age Hardened)

Bolt SizeDry (Nm)Lubricated (Nm)Clamp Load (kN)
M121159242
M16275220100
M20545436160
M24950760232
M3019001520368
M3633002640535
M4252504200736
M4878006240968
?? 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 K500 Bolts Applications — Industries & End Uses

Monel K500 Bolts 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 K500 bolts application details and RealBolt stock availability.
Monel K500 stud bolts and hex bolts are widely specified for ASME B16.5 wellhead flange connections, subsea valve actuator housings, and BOP stud bolt sets where simultaneous high tensile strength and seawater corrosion resistance are mandatory. Compliant with NACE MR0175/ISO 15156 for H2S sour service environments. Listed in Shell DEP and ExxonMobil EMSP approved materials registers.
Hex bolts, flange bolts, and stud bolt sets for naval vessel propeller shaft couplings, rudder pintles, sea chest valve flanges, and minesweeper deck fittings. Monel K500’s near-non-magnetic character and seawater immunity make it the standard specification for Royal Navy and NATO mine countermeasure vessel hardware per DEF STAN 02-833.
Flange stud bolt sets for multi-stage flash (MSF) and reverse osmosis (RO) desalination plant heat exchanger channel covers, brine pump casing flanges, and seawater intake valve bodies. Monel K500 bolts resist chloride pitting and erosion-corrosion in high-velocity brine streams where duplex stainless steel fasteners suffer accelerated attack.
Monel K500 bolts are the preferred fastener for hydrofluoric acid alkylation unit reactor flanges, HF acid storage vessel nozzle connections, and sulphuric acid concentration plant heat exchanger covers. The alloy’s resistance to reducing acids and fluoride-bearing media is unmatched by any stainless steel or titanium fastener at equivalent strength levels.

Monel K500 Bolts Standards & International Certifications

Monel K500 Bolts 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 931 DIN 933 ISO 4014 ISO 4017 ASME B18.2.1 BS 1768 BS 3692 IS 1364 IS 1367
Certifications
ISO 9001:2015NACE MR0175NABL LabPED 2014/68/EUMTC 3.1 / 3.2

Buy Monel K500 Bolts from India's Leading Manufacturer — Get a Competitive Quote Today

Partner with RealBolt — India’s leading manufacturer of certified Monel K500 Bolts — 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.
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Answers for Buyers

Monel K500 Bolts — Frequently Asked Questions

Browse expert answers to common questions about Monel K500 Bolts 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 K500 bolts selection and pricing.
Monel 400 (UNS N04400) and Monel K500 (UNS N05500) share the same nickel-copper base composition and corrosion resistance, but Monel K500 is precipitation hardened by additions of aluminium (2.30-3.15%) and titanium (0.35-0.85%). This age hardening raises tensile strength from approximately 550 MPa (Monel 400 annealed) to 1100 MPa minimum for Monel K500, making K500 bolts suitable for high-load flange connections where Monel 400 would be inadequate. Monel K500 bolts carry a price premium of approximately 20-30% over Monel 400 and require controlled age hardening heat treatment (16 hours at 593°C) to achieve full mechanical properties.
Yes – Monel K500 bolts are listed in NACE MR0175/ISO 15156-3 Table A.3 for use in H2S-containing sour service environments, subject to a maximum hardness of 35 HRC. All Monel K500 bolts supplied by us include a hardness survey report confirming compliance. Age hardening must be performed correctly – over-aged material can exceed the 35 HRC limit and will be rejected at third-party inspection. We supply hardness test certificates per ASTM E18 with every sour service order.
Monel K500 bolts are supplied in the age-hardened (precipitation hardened) condition. The standard heat treatment cycle is: solution anneal at 980°C followed by controlled cooling, then age hardening at 593°C for 16 hours with furnace cooling to 540°C, then air cool. This produces the Ni3(Al,Ti) gamma-prime precipitate responsible for the high strength. Bolts must never be welded after age hardening without re-solution annealing and re-ageing, as the HAZ will lose strength and may become susceptible to stress corrosion cracking in certain environments.
Yes – Monel K500 bolts perform excellently in full seawater immersion without any protective coating or cathodic protection. The alloy is immune to chloride pitting and crevice corrosion under bolt head bearing surfaces and under washers in seawater at temperatures up to approximately 60°C. Above 60°C in stagnant seawater, localised corrosion risk increases and nickel-based anti-seize should always be applied to threads. Monel K500 is listed in NORSOK MDS D45 for offshore structural fasteners in seawater service.

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