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Monel K500 Screws Manufacturer & Exporter in India

Explore Monel K500 Screws 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 Screws?

Monel K500 screws are precipitation-hardened nickel-copper alloy fasteners machined 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 Ni3(Al,Ti) precipitates during age-hardening treatment.

With a minimum tensile strength of 1100 MPa in the age-hardened condition and outstanding resistance to seawater corrosion, Monel K500 screws are specified for marine shaft hardware, pump and valve internals, and subsea fastener applications where both high strength and immunity to chloride attack are mandatory. The alloy is listed under NACE MR0175/ISO 15156 for sour-service environments and is a preferred fastener material in offshore, naval, and chemical processing industries worldwide.

Quick Specifications

MaterialMonel K500
UNS NumberN05500
DIN Number2.4375
Material StandardASTM B865
Screw Standard (Metric)DIN 912 / DIN 933 / ISO 4762
Screw Standard (Inch)ASME B18.3 / ASME B18.6.3
Thread FormISO Metric / UNC / UNF
Diameter RangeM4-M64 / #10-2½"
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 Nuts, 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 Nuts
Monel K500 Washers
Monel K500 Studs
Monel K500 Threaded Rods

Technical Data

Monel K500 Screws Dimensions, Sizes & Thread Standards

Monel K500 Screws are available in metric M6–M100 and inch ¼″–4″ as standard. Per DIN 912 (socket head cap screws) / DIN 933 (hex full thread) / ISO 4762. Custom lengths in 5mm increments. Inch dimensions available per ASME B18.3 and B18.6.3.

Socket Head Cap Screw Dimensions - Metric (DIN 912 / ISO 4762)

Size (M)Pitch (mm)Head Dia (mm)Head Ht (mm)Socket (mm)Max L (mm)
M40.77.04.03100
M50.88.55.04120
M61.010.06.05150
M81.2513.08.06200
M101.516.010.08250
M121.7518.012.010300
M162.024.016.014400
M202.530.020.017500
M243.036.024.019600
M303.545.030.022800
M364.054.036.0271000
M424.563.042.0321000
M485.072.048.0361200
M565.584.056.0411500
M646.096.064.0462000

Dimensional & Material Standards

StandardCoversThread
DIN 912Socket head cap screwsMetric
DIN 933Hex screws, full threadMetric
ISO 4762Socket head cap screwsMetric
ISO 7380Button head socket screwsMetric
ASME B18.3Socket head cap screwsUNC/UNF
ASME B18.6.3Machine screwsUNC/UNF
ASME B18.2.1Hex head screwsUNC/UNF
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 Screws 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 Screws

Al + Ti (2.30–3.15% / 0.35–0.85%) — Precipitation Hardening
Aluminium and titanium combine during age-hardening to form Ni3(Al,Ti) gamma-prime precipitates, raising tensile strength to 1100 MPa minimum — nearly double that of annealed Monel 400. This makes Monel K500 screws suitable for high-load marine and pump applications where standard nickel alloy screws would yield.
Cu (27–33%) — Seawater Corrosion Immunity
The high copper content gives Monel K500 screws exceptional resistance to seawater, brine, and hydrofluoric acid. Unlike stainless steel, Monel K500 does not suffer pitting or crevice corrosion under screw heads in immersed marine environments, making it the preferred choice for propeller shaft fasteners and sea chest hardware.
Low Carbon (0.25% max) — Thread Integrity
The controlled carbon ceiling prevents carbide precipitation at grain boundaries during machining and heat treatment, preserving corrosion resistance in the threaded zone. This is particularly important for fine-thread screws where the heat-affected zone at the thread root must retain full alloy performance.

Fastener Performance

Monel K500 Screws Mechanical Properties & Torque Reference

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

Screw SizeDry (Nm)Lubricated (Nm)Clamp Load (kN)
M614118
M8342716
M10675426
M121169342
M1628522898
M20560448155
M24970776224
M3019401552356
?? 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 - it introduces galvanic incompatibility and accelerates thread corrosion.

Industry Applications

Monel K500 Screws Applications — Industries & End Uses

Monel K500 Screws 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 screws application details and RealBolt stock availability.
Monel K500 socket head cap screws and hex screws are the standard fastener for propeller shaft couplings, rudder pintles, sea chest gratings, and underwater hull fittings on naval vessels and commercial ships. The combination of 1100 MPa tensile strength and complete immunity to seawater corrosion makes Monel K500 the only alloy that satisfies both structural and corrosion requirements simultaneously in continuous seawater immersion.
Impeller retention screws, casing cover fasteners, and valve bonnet screws in seawater lift pumps, desalination plant feed pumps, and offshore firewater systems are routinely specified in Monel K500. The age-hardened condition provides resistance to cavitation erosion and galling against Monel 400 or bronze mating surfaces, extending maintenance intervals significantly compared to duplex stainless alternatives.
Monel K500 machine screws and cap screws are used in wellhead instrument enclosures, subsea control module housings, and chemical injection valve bodies where H2S partial pressure and chloride concentration exceed the limits of 316L stainless steel. Compliant with NACE MR0175/ISO 15156 at hardness =35 HRC when properly age-hardened and tested per ASTM G36.
Screws for heat exchanger cover plates, reactor inspection ports, and agitator shaft hardware in hydrofluoric acid alkylation units, phosphoric acid concentrators, and sulphuric acid handling systems are specified in Monel K500. The alloy’s resistance to HF acid at all concentrations and temperatures is unmatched by any stainless steel or titanium grade.

Monel K500 Screws Standards & International Certifications

Monel K500 Screws 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 912 DIN 913 DIN 914 DIN 915 DIN 916 ISO 4762 ISO 10642 ASME B18.3 EN ISO 4762 IS 1367
Certifications
ISO 9001:2015NACE MR0175NABL LabPED 2014/68/EUMTC 3.1 / 3.2

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

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

Browse expert answers to common questions about Monel K500 Screws 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 screws selection and pricing.
Monel K500 screws are manufactured to DIN 912 (metric socket head cap screws), ISO 4762 (socket head cap screws), DIN 933 (hex full thread), ISO 7380 (button head socket screws), ASME B18.3 (inch socket head cap screws), and ASME B18.6.3 (machine screws). Special drive types including Torx, Phillips, and slotted heads are available on request. Custom thread forms including BSW, BSF, and UNF fine pitch are produced with a 15 working day lead time.
Monel 400 (UNS N04400) is the annealed nickel-copper alloy with a tensile strength of approximately 550 MPa – suitable for general corrosion resistance where structural loads are moderate. Monel K500 (UNS N05500) is the precipitation-hardened version, with aluminium and titanium additions that raise tensile strength to 1100 MPa minimum after age-hardening at 593°C. Both alloys share identical seawater and HF acid corrosion resistance, but Monel K500 screws are specified wherever high clamping loads, vibration resistance, or fatigue strength are required alongside corrosion immunity.
Yes – Monel K500 in the annealed condition has a magnetic permeability of =1.001 µ, making it effectively non-magnetic. However, cold working during thread rolling and head forming can induce a slight increase in permeability. For applications requiring certified non-magnetic performance (minesweeper hardware, MRI-adjacent equipment, sonar assemblies), specify solution-annealed and age-hardened material with permeability testing per ASTM A342. We supply permeability test reports on request.
Use a nickel-based anti-seize compound such as Molykote P-37, Jet-Lube KOPR-KOTE Pure Nickel, or Bostik Never-Seez Pure Nickel. Apply to the screw threads and bearing face before installation and reduce target torque by 20% compared to dry assembly values. Avoid copper-based or zinc-based anti-seize products – the galvanic potential difference between copper and the nickel-copper matrix of Monel K500 promotes accelerated corrosion in wet or immersed service conditions.

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