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Cupro Nickel 70/30 Washers Manufacturer & Exporter in India

Explore Cupro Nickel 70/30 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 70/30 Washers?

Cupro Nickel 70/30 washers are corrosion-resistant flat, spring, and locking washers manufactured from a copper-nickel alloy containing 70% copper and 30% nickel, designated as UNS C71500. These washers are produced in accordance with ASTM B151 and B152 standards, offering excellent resistance to seawater, brine, and marine atmospheres. The addition of iron and manganese enhances their strength and imparts superior resistance to impingement and biofouling, making them ideal for marine and offshore bolted joints.

Cupro Nickel 70/30 washers are widely specified for use in heat exchanger tube sheets, condenser assemblies, and piping flange connections in shipbuilding, desalination, and chemical processing industries where stainless steel washers are prone to crevice corrosion and galvanic attack.

Quick Specifications

MaterialCupro Nickel 70/30
UNS NumberC71500
DIN Number2.0882
Material StandardASTM B151 / B152
Washer Standard (Metric)DIN 125 / DIN 127 / DIN 9021
Washer Standard (Inch)ASME B18.22.1
TypeFlat, Spring, Lock, Fender
Size RangeM3-M64 / 1/8"-2½"
Tensile Strength245 MPa (35.5 ksi) min
Yield Strength105 MPa (15.2 ksi) min
HardnessMax 80 HRB
? All washers supplied with full traceability and NABL-accredited test reports. PMI and corrosion testing available on request.

Complete the Fastener Set

Other Cupro Nickel 70/30 Fastener Products Available from RealBolt

RealBolt also manufactures the complete Cupro Nickel 70/30 fastener range from certified copper-nickel alloy bar stock, including Cupro Nickel 70/30 Bolts, Cupro Nickel 70/30 Nuts, Cupro Nickel 70/30 Screws, Cupro Nickel 70/30 Studs, and Cupro Nickel 70/30 Threaded Rods. All Cupro Nickel 70/30 fastener types are produced to ASTM with full EN 10204 MTC 3.1/3.2 documentation.
Cupro Nickel 70/30 Bolts
Cupro Nickel 70/30 Nuts
Cupro Nickel 70/30 Screws
Cupro Nickel 70/30 Studs
Cupro Nickel 70/30 Threaded Rods

Technical Data

Cupro Nickel 70/30 Washers Dimensions, Sizes & Thread Standards

Cupro Nickel 70/30 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 thickness available. Metric and inch sizes supplied. All Cupro Nickel 70/30 washers dimensions are verified against applicable DIN, ISO, and

Flat Washer Dimensions - Metric (DIN 125A)

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 B151Rod/bar - UNS C71500
ASTM B152Plate/sheet - UNS C71500
EN 1652Copper and copper alloys
EN 10204 3.1Mill test certificate
EN 10204 3.2TPI-witnessed MTC

Material Chemistry

Cupro Nickel 70/30 Chemical Composition

Cupro Nickel 70/30 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/B152

ElementComposition (%)
Copper (Cu)65.0-70.0%
Nickel (Ni) incl. Cobalt29.0-33.0%
Iron (Fe)0.4-1.0%
Manganese (Mn)0.5-1.0%
Zinc (Zn)1.0% max
Lead (Pb)0.05% max
Phosphorus (P)0.02% max
Other elements0.30% max (total)
? All heats verified by spectrometry. Full chemical analysis supplied with every batch.

Why Cupro Nickel 70/30 Alloy Composition Matters for Washers

Nickel (29–33%) — Seawater Resistance
High nickel content ensures Cupro Nickel 70/30 washers resist chloride-induced corrosion and biofouling, making them ideal for marine and desalination plant bolted joints.
Iron & Manganese — Erosion & Impingement Strength
Iron and manganese additions improve resistance to impingement attack and erosion, critical for washers in high-velocity seawater piping and condenser assemblies.
Low Zinc & Lead — Non-Toxic, Stable Alloy
Minimal zinc and lead content ensures Cupro Nickel 70/30 washers are non-sparking, non-toxic, and suitable for potable water and fire protection systems.

Fastener Performance

Cupro Nickel 70/30 Washers Mechanical Properties & Torque & Proof Load Reference

The table below lists mechanical properties and proof load reference for Cupro Nickel 70/30 Washers per ASTM. Cupro Nickel 70/30 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
M36M36170.0
?? Note: For dynamic or vibration-prone assemblies, use spring or lock washers for improved joint security. Contact us for application-specific recommendations.

Industry Applications

Cupro Nickel 70/30 Washers Applications — Industries & End Uses

Cupro Nickel 70/30 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 70/30 washers are the preferred choice for hull penetrations, seawater piping flanges, and deck equipment in naval and commercial vessels. Their resistance to biofouling and crevice corrosion ensures long-term reliability in marine atmospheres and submerged conditions.
Flat and spring washers for bolted joints in evaporator tube sheets, brine heaters, and high-salinity process piping. Cupro Nickel 70/30 is specified for its immunity to chloride stress corrosion and low maintenance requirements.
Washers for tube sheet assemblies, water boxes, and cooling water systems in thermal and nuclear power plants. The alloy’s high thermal conductivity and resistance to erosion by high-velocity water make it ideal for these demanding applications.
Used in riser clamps, splash zone supports, and subsea flange connections where resistance to seawater, brine, and sulfide stress cracking is critical. Cupro Nickel 70/30 washers are compatible with cathodic protection systems.

Cupro Nickel 70/30 Washers Standards & International Certifications

Cupro Nickel 70/30 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 70/30 Washers from India's Leading Manufacturer — Get a Competitive Quote Today

Partner with RealBolt — India’s leading manufacturer of certified Cupro Nickel 70/30 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.
022-6743-7972
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Answers for Buyers

Cupro Nickel 70/30 Washers — Frequently Asked Questions

Browse expert answers to common questions about Cupro Nickel 70/30 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 70/30 washers selection and pricing.
Cupro Nickel 70/30 washers are available to DIN 125 (flat), DIN 127 (spring), DIN 9021 (fender), ISO 7089/7090, and ASME B18.22.1 (inch). Custom OD, ID, and thickness can be supplied to drawing or project specification. All washers are manufactured from ASTM B151/B152 C71500 alloy with full traceability.
Yes – Cupro Nickel 70/30 washers are specifically designed for seawater service, offering outstanding resistance to pitting, crevice corrosion, and biofouling. They are the industry standard for shipbuilding, desalination, and offshore platforms, and are compatible with cathodic protection systems.
Yes, Cupro Nickel 70/30 washers can be used with stainless steel bolts, especially in marine and brine environments. However, to minimize galvanic corrosion, it is recommended to use insulating washers or apply a suitable barrier coating between dissimilar metals in highly aggressive conditions.
No formal MOQ for standard sizes (M6-M24) held in stock – we supply from single pieces for urgent maintenance. Custom sizes or special types (spring, fender) may require a 5 kg minimum. Quantity discounts are available 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