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Cupro Nickel 90/10 Nuts Manufacturer & Exporter in India

Explore Cupro Nickel 90/10 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

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 Nuts?

Cupro Nickel 90/10 nuts are corrosion-resistant fasteners manufactured from a copper-nickel alloy containing 90% copper and 10% nickel, designated as UNS C70600. These nuts are produced in accordance with ASTM B151 and B151M standards, offering excellent resistance to seawater corrosion, biofouling, and stress corrosion cracking. Their inherent ductility and non-magnetic properties make them ideal for marine and offshore applications where reliability and longevity are critical.

Cupro Nickel 90/10 nuts are widely specified for use in heat exchangers, condensers, shipbuilding, and desalination plants due to their outstanding performance in saline and brackish water environments. They are compatible with Cupro Nickel 90/10 bolts and studs, ensuring galvanic compatibility and long-term joint integrity.

Quick Specifications

MaterialCupro Nickel 90/10
UNS NumberC70600
DIN Number2.0872
Material StandardASTM B151 / B151M
Nut Standard (Metric)DIN 934 / ISO 4032
Nut Standard (Inch)ASME B18.2.2
Thread FormISO Metric / UNC / UNF
Size RangeM6-M64 / ¼"-2½"
Tensile Strength245 MPa (35.5 ksi) min
Yield Strength105 MPa (15.2 ksi) min
HardnessMax 80 HRB
? All material certified by NABL-accredited laboratory. PMI and chemical analysis 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 Screws, Cupro Nickel 90/10 Washers, 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 Screws
Cupro Nickel 90/10 Washers
Cupro Nickel 90/10 Studs
Cupro Nickel 90/10 Threaded Rods

Technical Data

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

Cupro Nickel 90/10 Nuts are available in metric M6–M100 and inch ¼″–4″ as standard. Per DIN 934 (hex nut) / ISO 4032. Custom thread forms and sizes available. Inch dimensions per ASME B18.2.2. All Cupro Nickel 90/10 nuts dimensions are verified against applicable DIN, ISO, and ASME B18 standards before

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

Size (M)Pitch (mm)A/F (mm)Height (mm)
M61.0105
M81.25136.5
M101.5178
M121.751910
M162.02413
M202.53016
M243.03619
M303.54624
M364.05529
M424.56534
M485.07538
M565.58545
M646.09551

Dimensional & Material Standards

StandardCoversThread
DIN 934Hex nutsMetric
ISO 4032Hex nutsMetric
ASME B18.2.2Hex & heavy hex nutsUNC/UNF
BS 4190Hex nutsMetric/Imperial
Material StandardRequirement
ASTM B151Bar/rod - UNS C70600
ASTM B151MMetric bar/rod
EN 12163Copper and copper alloys - Rod
EN 10204 3.1Mill test certificate
EN 10204 3.2TPI-witnessed MTC

Material Chemistry

Cupro Nickel 90/10 Chemical Composition

Cupro Nickel 90/10 Nuts 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
Other elements (each)0.05% max
Other elements (total)0.15% max
? All heats verified by NABL-accredited spectrometry. PMI available on request.

Why Cupro Nickel 90/10 Alloy Composition Matters for Nuts

Nickel (9–11%) — Seawater Corrosion Resistance
Nickel content in Cupro Nickel 90/10 provides exceptional resistance to chloride-induced corrosion, making these nuts ideal for marine and desalination plant use where stainless steel may fail.
Iron & Manganese — Strength & Biofouling Resistance
Iron and manganese additions enhance mechanical strength and improve resistance to biofouling, ensuring long-term performance in submerged and splash zone applications.
Copper — Antimicrobial & Non-Sparking
High copper content gives these nuts natural antimicrobial properties and makes them non-sparking, suitable for hazardous and hygienic environments.

Fastener Performance

Cupro Nickel 90/10 Nuts Mechanical Properties & Torque Reference

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

Nut SizeRecommended Torque (Nm)Clamp Load (kN)
M123518
M167028
M2014044
M2424063
M30480100
M36820146
M421200198
M481800260
?? Anti-seize: Use copper-based anti-seize for marine service. Lubricated values assume K=0.18. Retorque after thermal cycling in service.

Industry Applications

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

Cupro Nickel 90/10 Nuts 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 nuts are the preferred choice for hull fittings, seawater piping flanges, and deck equipment in naval and commercial vessels. Their resistance to saltwater corrosion and biofouling ensures long service life in harsh marine environments.
Used in desalination plant piping, heat exchanger channel covers, and brine discharge flanges, these nuts maintain integrity in high-chloride and brackish water conditions where stainless steel fasteners are prone to crevice corrosion.
Cupro Nickel 90/10 nuts are specified for condenser tube sheets, cooling water systems, and heat exchanger assemblies in thermal and nuclear power plants, providing reliable performance in circulating water systems.
Ideal for splash zone and submerged connections on offshore platforms, riser clamps, and subsea pipeline supports, these nuts resist corrosion and maintain mechanical properties in aggressive saline environments.

Cupro Nickel 90/10 Nuts Standards & International Certifications

Cupro Nickel 90/10 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 9001:2015NABL LabPED 2014/68/EUMTC 3.1 / 3.2

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

Partner with RealBolt — India’s leading manufacturer of certified Cupro Nickel 90/10 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.
022-6743-7972
+91 90226 36025
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Answers for Buyers

Cupro Nickel 90/10 Nuts — Frequently Asked Questions

Browse expert answers to common questions about Cupro Nickel 90/10 Nuts 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 nuts selection and pricing.
Cupro Nickel 90/10 hex nuts are available to DIN 934 (metric), ISO 4032, ASME B18.2.2 (inch hex and heavy hex), and BS 4190. Custom thread forms such as UNC, UNF, and Whitworth are available on request. All nuts are supplied with full traceability and certification.
Copper-based anti-seize compound is recommended for Cupro Nickel 90/10 nuts in marine and offshore service (e.g., Molykote Cu-7439 or Loctite LB 8008). Apply to threads and bearing surfaces to prevent galling and facilitate disassembly after long-term exposure to seawater.
Yes – Cupro Nickel 90/10 nuts are specifically designed for continuous immersion in seawater and brine. They resist pitting, crevice corrosion, and biofouling, making them ideal for shipbuilding, desalination, and offshore structures.
No formal MOQ for standard sizes (M8-M36) held in stock – single-piece orders are accepted for urgent repairs. Custom sizes or non-standard threads may require a 10 kg minimum. Quantity discounts apply at 50, 200, and 500 pieces.

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