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Monel K500 Nuts Manufacturer & Exporter in India

Explore Monel K500 Nuts 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 Nuts?

Monel K500 nuts are precipitation-hardened 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 the addition of aluminium (2.30-3.15%) and titanium (0.35-0.85%), which form the Ni3(Al,Ti) gamma-prime precipitate during age-hardening heat treatment.

With a minimum tensile strength of 1100 MPa in the age-hardened condition, Monel K500 nuts outperform standard stainless steel nuts by a wide margin while maintaining full immunity to chloride stress corrosion cracking – a failure mode that eliminates austenitic stainless grades from seawater and marine service. Monel K500 nuts are specified under NACE MR0175/ISO 15156 for sour-service wellhead connections, offshore mooring hardware, and marine propulsion shaft assemblies worldwide.

Quick Specifications

MaterialMonel K500
UNS NumberN05500
DIN Number2.4375
Material StandardASTM B865
Nut Standard (Metric)DIN 934 / DIN 6915 / ISO 4032
Nut Standard (Inch)ASME B18.2.2
Thread FormISO Metric / UNC / UNF
Size 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 Bolts, 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 Bolts
Monel K500 Screws
Monel K500 Washers
Monel K500 Studs
Monel K500 Threaded Rods

Technical Data

Monel K500 Nuts Dimensions, Sizes & Thread Standards

Monel K500 Nuts are available in metric M6–M100 and inch ¼″–4″ as standard. Per DIN 934 (hex nuts) / DIN 6915 (heavy hex) / ISO 4032. Inch dimensions available per ASME B18.2.2. Custom thread forms on request. All Monel K500 nuts dimensions are verified against applicable DIN, ISO, and ASME

Hex Nut Dimensions - Metric (DIN 934 / ISO 4032)

Size (M)Pitch (mm)A/F (mm)Nut Height (mm)Min Width (mm)Max Width (mm)
M61.0105.09.7810.00
M81.25136.512.7313.00
M101.5178.016.7317.00
M121.751910.018.6719.00
M162.02413.023.6724.00
M202.53016.029.1630.00
M243.03619.035.0036.00
M303.54624.045.0046.00
M364.05529.053.8055.00
M424.56534.063.1065.00
M485.07538.073.1075.00
M565.58545.082.8085.00
M646.09551.092.8095.00
M726.010558.0102.80105.00
M806.011564.0112.80115.00
M1006.014580.0141.80145.00

Dimensional & Material Standards

StandardCoversThread
DIN 934Hex nuts, standard heightMetric
DIN 6915Heavy hex nuts, structuralMetric
ISO 4032Hex nuts, style 1Metric
ISO 4033Hex nuts, style 2 (high)Metric
ASME B18.2.2Hex & heavy hex nutsUNC/UNF
ASME B16.5Heavy hex nuts for flangesUNC
MSS SP-75Heavy hex nuts, high-pressureUNC
Material StandardRequirement
ASTM B865Bar/rod - UNS N05500
ASTM F467Fastener 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 Nuts 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 Nuts

Al + Ti (Precipitation Hardening) — Strength Without Compromise
The addition of aluminium (2.30–3.15%) and titanium (0.35–0.85%) enables age-hardening heat treatment that forms Ni3(Al,Ti) gamma-prime precipitates. This raises tensile strength to 1100 MPa minimum — more than double the annealed condition — without sacrificing the alloy's inherent corrosion resistance in seawater and aggressive chemical environments.
Cu (27–33%) — Chloride and Seawater Immunity
The high copper content gives Monel K500 nuts complete immunity to chloride stress corrosion cracking, a failure mode that disqualifies austenitic stainless steel nuts from marine and offshore service. Nuts remain fully resistant to seawater pitting and crevice corrosion under bearing faces without any protective coating.
Low Carbon and Sulphur — Thread Integrity
Carbon is held to 0.25% max and sulphur to 0.010% max to prevent intergranular attack and hot-shortness during machining. This ensures clean, burr-free internal threads with consistent dimensional accuracy across all nut sizes, critical for reliable torque-tension relationships in bolted flange assemblies.

Fastener Performance

Monel K500 Nuts Mechanical Properties & Torque Reference

The table below lists mechanical properties and torque reference for Monel K500 Nuts per ASTM. Monel K500 nuts 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 Nuts (Age-Hardened)

Nut SizeDry (Nm)Lubricated (Nm)Clamp Load (kN)
M121159242
M16275220100
M20545436160
M24945756231
M3018901512368
M3632902632534
M4252504200735
M4878006240966
?? 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 Nuts Applications — Industries & End Uses

Monel K500 Nuts 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 nuts application details and RealBolt stock availability.
Monel K500 heavy hex nuts are the standard specification for ASME B16.5/B16.47 flanged wellhead connections, subsea Christmas tree assemblies, and BOP stack hardware. NACE MR0175 compliant for H2S sour service. Specified in Shell DEP, ExxonMobil EMSP, and NORSOK MDS D47 for offshore structural fastener sets.
Hex nuts and heavy hex nuts for marine propeller shaft couplings, rudder stock assemblies, deck machinery foundations, and offshore mooring chain connectors. Monel K500’s combination of 1100 MPa tensile strength and complete seawater corrosion immunity makes it the preferred choice for long-term immersed and splash-zone bolted connections where stainless steel fails by stress corrosion cracking.
Flange nut sets for heat exchanger channel covers (TEMA Class B/C), reactor closure flanges, and pressure vessel nozzle connections in hydrofluoric acid, sulphuric acid, and mixed halide process environments. Monel K500 nuts resist corrosion in reducing acid conditions where both stainless steel and Inconel 625 are unsuitable.
Monel K500 nuts are specified for multi-stage flash (MSF) and reverse osmosis (RO) plant pressure vessel closures, high-pressure pump casing joints, and brine heater tube sheet connections. The alloy’s resistance to chloride-bearing hot brine at temperatures up to 120°C eliminates the risk of stress corrosion cracking failures that affect duplex stainless steel fasteners in these environments.

Monel K500 Nuts Standards & International Certifications

Monel K500 Nuts 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 934 ISO 4032 ASME B18.2.2 BS 1768 BS EN ISO 4032 IS 1364 IS 1367
Certifications
ISO 9001:2015NACE MR0175NABL LabPED 2014/68/EUMTC 3.1 / 3.2

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

Partner with RealBolt — India’s leading manufacturer of certified Monel K500 Nuts — 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 Nuts — Frequently Asked Questions

Browse expert answers to common questions about Monel K500 Nuts 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 nuts selection and pricing.
Monel K500 hex nuts are available to DIN 934 (standard hex), DIN 6915 (heavy hex structural), ISO 4032 (style 1), ISO 4033 (style 2 high nut), and ASME B18.2.2 (inch hex and heavy hex). Heavy hex nuts for ASME B16.5 flange stud bolt sets are supplied per ASME B18.2.2 with dimensions matched to the applicable pressure class. Custom thread forms including BSW, BSF, and BSPP are available on request with a 15 working day lead time.
Monel 400 (UNS N04400) nuts are supplied in the annealed condition with a tensile strength of approximately 550 MPa. Monel K500 (UNS N05500) nuts are age-hardened to achieve a minimum tensile strength of 1100 MPa – roughly double that of Monel 400 – through the precipitation of Ni3(Al,Ti) gamma-prime phase. Both grades offer equivalent corrosion resistance in seawater and chemical environments. Monel K500 is specified where higher bolt preload, vibration resistance, or structural load-bearing capacity is required. Monel 400 is preferred where cost is the primary driver and lower clamping loads are acceptable.
Yes – Monel K500 nuts have a magnetic permeability of approximately µ = 1.001, making them effectively non-magnetic in the age-hardened condition. This property is critical for naval minesweeper deck hardware, magnetic resonance imaging (MRI) facility structural connections, and sensitive instrumentation enclosures where ferromagnetic fasteners would cause interference or safety hazards. Confirm permeability test reports are included in the MTC when ordering for non-magnetic applications.
Use a pure nickel-based anti-seize compound such as Molykote P-37, Bostik Never-Seez Pure Nickel, or Jet-Lube KOPR-KOTE Pure Nickel. Apply to the bolt thread and the nut bearing face before assembly. Reduce target torque values by approximately 20% compared to dry assembly values. Do not use copper-based or zinc-based anti-seize on Monel K500 – the galvanic potential difference between copper and the nickel-copper matrix can accelerate crevice corrosion under the nut bearing face in immersed service.

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