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Cupro Nickel 90/10 Washers Manufacturer & Exporter in India

Explore Cupro Nickel 90/10 Washers 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

1000

Max Temp

🌡

1000

Suitable for continuous service up to approximately 1000°C under typical operating conditions.

⚡

700

Typical tensile strength around 700 MPa depending on product form and heat treatment.

🛡

Excellent

Excellent corrosion resistance in a wide range of industrial environments.

⚖

8.9

Typical density is approximately 8.9 g/cm³.

Product Overview

What are Cupro Nickel 90/10 Washers?

Cupro Nickel 90/10 washers are corrosion-resistant flat, spring, and lock washers manufactured from a copper-nickel alloy containing 90% copper and 10% nickel, designated as UNS C70600. These washers are produced in accordance with ASTM B151 and B152 standards, offering excellent resistance to seawater, brine, and marine atmospheres. Their inherent anti-biofouling properties and high ductility make them the preferred choice for bolted joints in shipbuilding, desalination, and offshore piping systems.

With a minimum tensile strength of 245 MPa and outstanding resistance to stress corrosion cracking, Cupro Nickel 90/10 washers are specified for use under nuts and bolt heads in critical flange assemblies, heat exchangers, and condenser tube sheets exposed to aggressive saline environments.

Quick Specifications

MaterialCupro Nickel 90/10
UNS NumberC70600
DIN Number2.0872
Material StandardASTM B151 / B152
Washer Standard (Metric)DIN 125 / DIN 127 / DIN 9021
Washer Standard (Inch)ASME B18.22.1
TypeFlat, Spring, Lock, Fender, Tab
Size RangeM3-M64 / 1/8"-2½"
Tensile Strength245 MPa (35.5 ksi) min
Yield Strength105 MPa (15 ksi) min
HardnessMax 80 HRB
? All material certified by NABL-accredited laboratory. PMI and IGC test available on request.

Complete the Fastener Set

Other Cupro Nickel 90/10 Fastener Products Available from RealBolt

RealBolt also manufactures the complete Cupro Nickel 90/10 fastener range from certified copper-nickel alloy bar stock, including Cupro Nickel 90/10 Bolts, Cupro Nickel 90/10 Nuts, Cupro Nickel 90/10 Screws, Cupro Nickel 90/10 Studs, and Cupro Nickel 90/10 Threaded Rods. All Cupro Nickel 90/10 fastener types are produced to ASTM with full EN 10204 MTC 3.1/3.2 documentation.
Cupro Nickel 90/10 Bolts
Cupro Nickel 90/10 Nuts
Cupro Nickel 90/10 Screws
Cupro Nickel 90/10 Studs
Cupro Nickel 90/10 Threaded Rods

Technical Data

Cupro Nickel 90/10 Washers Dimensions, Sizes & Thread Standards

Cupro Nickel 90/10 Washers are available in metric M6–M100 and inch ¼″–4″ as standard. Per DIN 125 (flat), DIN 127 (spring), DIN 9021 (fender), and ASME B18.22.1. Custom OD/ID and thicknesses available. Metric and inch sizes supplied. All Cupro Nickel 90/10 washers dimensions are verified against applicable DIN, ISO, and

Flat Washer Dimensions - Metric (DIN 125)

Size (M)Inner Dia (mm)Outer Dia (mm)Thickness (mm)
M33.270.5
M66.4121.6
M88.4161.6
M1010.5202.0
M1213.0242.5
M1617.0303.0
M2021.0373.0
M2425.0444.0
M3031.0564.0
M3637.0665.0
M4243.0786.0
M4849.0926.0
M5657.01058.0
M6465.01158.0

Dimensional & Material Standards

StandardCoversType
DIN 125Flat washersMetric
DIN 127Spring lock washersMetric
DIN 9021Fender washersMetric
ASME B18.22.1Plain & lock washersInch
ISO 7089Flat washersMetric
ISO 7090Chamfered washersMetric
Material StandardRequirement
ASTM B151Plate/strip - UNS C70600
ASTM B152Sheet/strip - UNS C70600
EN 1652Copper alloy strip
EN 12166Copper alloy wire
EN 10204 3.1Mill test certificate
EN 10204 3.2TPI-witnessed MTC

Material Chemistry

Cupro Nickel 90/10 Chemical Composition

Cupro Nickel 90/10 Washers are manufactured from a copper-nickel alloy with nickel (9–33%), iron (1–2%), and manganese additions per ASTM and MIL-C-15726. Iron additions are essential — they form a protective surface film that resists seawater impingement and erosion-corrosion at flow velocities up to 3.5 m/s in shipboard piping and offshore cooling systems.

Chemical Composition per ASTM B151

ElementComposition (%)
Copper (Cu)88.6% min
Nickel (Ni) incl. Cobalt9.0-11.0%
Iron (Fe)1.0-1.8%
Manganese (Mn)1.0% max
Zinc (Zn)1.0% max
Lead (Pb)0.05% max
Phosphorus (P)0.04% max
Carbon (C)0.05% max
? All heats verified by NABL-accredited spectrometry. PMI and IGC test available on request.

Why Cupro Nickel 90/10 Alloy Composition Matters for Washers

Nickel (9–11%) — Seawater Corrosion Resistance
Nickel content ensures Cupro Nickel 90/10 washers resist pitting, crevice corrosion, and biofouling in marine and brine environments, making them ideal for submerged and splash zone applications.
Iron (1.0–1.8%) — Strength & Erosion Resistance
Iron improves mechanical strength and resistance to impingement attack from high-velocity seawater, critical for washers in pump and valve assemblies.
Low Impurity Levels
Strict limits on lead, phosphorus, and carbon ensure ductility and prevent embrittlement, maintaining washer integrity under cyclic loading and vibration.

Fastener Performance

Cupro Nickel 90/10 Washers Mechanical Properties & Torque & Proof Load Reference

The table below lists mechanical properties and proof load reference for Cupro Nickel 90/10 Washers per ASTM. Cupro Nickel 90/10 washers achieve 700 MPa tensile strength, with hardness, yield, and elongation values verified by NABL-accredited testing and reported in the EN 10204 MTC.

Washer SizeRecommended Bolt SizeMax Load (kN)
M6M66.5
M10M1016.5
M16M1633.0
M20M2052.0
M24M2475.0
M30M30120.0
M36M36175.0
?? Installation: Ensure washers are flat and free from burrs. For marine use, pair with Cupro Nickel or Monel fasteners for maximum corrosion resistance.

Industry Applications

Cupro Nickel 90/10 Washers Applications — Industries & End Uses

Cupro Nickel 90/10 Washers from RealBolt are specified across marine shipbuilding, offshore seawater systems, and naval defence where excellent corrosion resistance and 700 MPa tensile strength are required for reliable fastener performance. Click each industry below for detailed application examples.
Cupro Nickel 90/10 washers are the standard for hull penetrations, deck equipment, and seawater piping flanges on naval and commercial vessels. Their anti-biofouling properties and resistance to saltwater corrosion ensure long-term reliability in splash zones and submerged assemblies.
Used under nuts and bolt heads in evaporator, condenser, and heat exchanger flanges, Cupro Nickel 90/10 washers prevent galvanic corrosion and maintain joint integrity in brine and high-chloride process environments.
Specified for riser clamps, cable tray supports, and structural connections exposed to seawater spray and immersion. Washers maintain preload and resist crevice corrosion in harsh offshore atmospheres.
Cupro Nickel 90/10 washers are used in cooling water intake and discharge flanges, tube sheets, and pump assemblies in thermal and nuclear power plants, where resistance to erosion and impingement is critical.

Cupro Nickel 90/10 Washers Standards & International Certifications

Cupro Nickel 90/10 Washers 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 125A DIN 126 DIN 127 DIN 128 ISO 7089 ISO 7090 ASME B18.21.1 EN ISO 7089 BS 4320 IS 5372 IS 1367
Certifications
ISO 9001:2015NABL LabPED 2014/68/EUMTC 3.1 / 3.2

Buy Cupro Nickel 90/10 Washers from India's Leading Manufacturer — Get a Competitive Quote Today

Partner with RealBolt — India’s leading manufacturer of certified Cupro Nickel 90/10 Washers — 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

Cupro Nickel 90/10 Washers — Frequently Asked Questions

Browse expert answers to common questions about Cupro Nickel 90/10 Washers from RealBolt — covering 70/30 vs 90/10 selection, ASTM B151, seawater immunity, MIL-C-15726 approval, sizes, and Lloyds/DNV certification. Contact our technical team directly for project-specific guidance on Cupro Nickel 90/10 washers selection and pricing.
Cupro Nickel 90/10 washers are available to DIN 125 (flat), DIN 127 (spring lock), DIN 9021 (fender), ISO 7089/7090, and ASME B18.22.1 (inch plain and lock). Custom OD, ID, and thicknesses can be supplied to drawing or project specification.
While Cupro Nickel 90/10 washers can be paired with stainless steel bolts, it is best practice to use them with Cupro Nickel or Monel fasteners to avoid galvanic corrosion in seawater. If mixed-metal joints are unavoidable, use an insulating washer or coating to minimize galvanic potential.
Yes – Cupro Nickel 90/10 washers are specifically designed for continuous immersion in seawater and brine. They resist pitting, crevice corrosion, and marine biofouling, making them ideal for submerged flange joints and marine hardware.
No MOQ for standard sizes (M6-M24) held in stock – single pieces can be supplied for urgent repairs. Custom sizes or special types (tab, fender, extra-thick) typically require a 5 kg minimum. Quantity discounts apply at 100 pcs, 500 pcs, and 1000 pcs.

Industrial Cities We Serve:

  • Ahmedabad
  • Aurangabad
  • Bengaluru
  • Chennai
  • Coimbatore
  • Faridabad
  • Gandhidham
  • Greater Noida
  • Gurugram
  • Hazira
  • Hosur
  • Hyderabad
  • Jamnagar
  • Jamshedpur
  • Ludhiana
  • Mumbai
  • Mundra
  • Mysuru
  • Nagpur
  • Nashik
  • Navi Mumbai
  • Noida
  • Pune
  • Rajkot
  • Sanand
  • Surat
  • Thane
  • Tiruppur
  • Vadodara
  • Visakhapatnam

Countries We Export To:

  • US
  • Canada
  • Mexico
  • Germany
  • UK
  • France
  • Italy
  • Spain
  • Netherlands
  • Belgium
  • Poland
  • Sweden
  • Norway
  • Denmark
  • Turkey
  • UAE
  • Saudi Arabia
  • Qatar
  • Oman
  • Kuwait
  • Bahrain
  • South Africa
  • Egypt
  • Nigeria
  • Australia
  • New Zealand
  • Singapore
  • Malaysia
  • Indonesia
  • Thailand
  • Vietnam
  • South Korea
  • Japan
  • Brazil