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Cupro Nickel 90/10 Bolts Manufacturer & Exporter in India

Explore Cupro Nickel 90/10 Bolts 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 Bolts?

Cupro Nickel 90/10 bolts are corrosion-resistant fasteners manufactured from a copper-nickel alloy containing 90% copper and 10% nickel, designated as UNS C70600. These bolts are produced from ASTM B151 or B151M bar stock and are renowned for their exceptional resistance to seawater corrosion, biofouling, and stress corrosion cracking. The addition of iron and manganese enhances their overall strength and imparts superior resistance to erosion and impingement attack in marine environments.

Cupro Nickel 90/10 bolts are widely specified for marine hardware, desalination plants, offshore oil & gas platforms, and shipbuilding applications where long-term durability and resistance to brine, saltwater, and brackish water are critical. They are non-sparking, non-magnetic, and maintain mechanical integrity even after prolonged exposure to harsh environments.

Quick Specifications

MaterialCupro Nickel 90/10
UNS NumberC70600
DIN Number2.0872
Material StandardASTM B151 / B151M
Bolt Standard (Metric)DIN 931 / DIN 933 / ISO 4014
Bolt Standard (Inch)ASME B18.2.1
Thread FormISO Metric / UNC / UNF
Diameter RangeM6-M64 / ¼"-2½"
Tensile Strength245 MPa (35 ksi) min
Yield Strength105 MPa (15 ksi) min
HardnessMax 80 HRB / 150 HB
? All material certified by NABL-accredited laboratory. PMI and ferrite testing 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 Nuts, 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 Nuts
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 Bolts Dimensions, Sizes & Thread Standards

Cupro Nickel 90/10 Bolts are available in metric M6–M100 and inch ¼″–4″ as standard. Per DIN 931 (partial thread) / DIN 933 (full thread) / ISO 4014. Custom lengths in 5mm increments. Inch dimensions available per ASME B18.2.1. All Cupro Nickel 90/10 bolts dimensions conform to applicable DIN, ISO, and ASME B18 standards.

Hex Bolt Dimensions - Metric (DIN 931 / ISO 4014)

Size (M)Pitch (mm)A/F (mm)Head Ht (mm)Min L (mm)Max L (mm)
M61.0104.010200
M81.25135.312250
M101.5176.416300
M121.75197.520400
M162.02410.025500
M202.53012.530600
M243.03615.040600
M303.54618.750800
M364.05522.5601000
M424.56526.0801000
M485.07530.01001200
M565.58535.01201500
M646.09540.01402000

Dimensional & Material Standards

StandardCoversThread
DIN 931Hex bolts, partial threadMetric
DIN 933Hex bolts, full threadMetric
ISO 4014Hex head screws, partialMetric
ISO 4017Hex head screws, fullMetric
ASME B18.2.1Hex & heavy hex boltsUNC/UNF
ASME B16.5Stud bolts for flangesUNC
MSS SP-75Stud bolts, high-pressureUNC
Material StandardRequirement
ASTM B151Bar/rod - UNS C70600
ASTM B467Forged/cold worked fasteners
EN 12163Copper and copper alloys
EN 10204 3.1Mill test certificate
EN 10204 3.2TPI-witnessed MTC

Material Chemistry

Cupro Nickel 90/10 Chemical Composition

Cupro Nickel 90/10 Bolts 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 Bolts

Nickel (9–11%) — Seawater Corrosion Resistance
Nickel content ensures Cupro Nickel 90/10 bolts resist pitting, crevice corrosion, and stress corrosion cracking in seawater, making them ideal for marine and desalination applications.
Iron & Manganese — Erosion & Impingement Resistance
Iron (1.0–1.8%) and manganese (up to 1.0%) improve resistance to erosion and impingement attack from fast-flowing seawater, extending bolt service life in piping and pump assemblies.
Low Impurity Levels
Strict limits on lead, phosphorus, and other elements ensure mechanical integrity and prevent galvanic corrosion when Cupro Nickel 90/10 bolts are used with other copper alloys or stainless steel hardware.

Fastener Performance

Cupro Nickel 90/10 Bolts Mechanical Properties & Torque Reference

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

Bolt SizeDry (Nm)Lubricated (Nm)Clamp Load (kN)
M12383013
M16907228
M2018014445
M2432025670
M30640512112
M361100880162
M4217501400220
M4826002080295
?? Anti-galling: Use copper-based anti-seize (Molykote Cu-7439 or equivalent). Lubricated values assume K=0.16. Avoid nickel-based anti-seize for copper alloys.

Industry Applications

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

Cupro Nickel 90/10 Bolts 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 bolts are the preferred choice for hull penetrations, seawater piping flanges, propeller shaft couplings, and marine heat exchanger assemblies. Their resistance to biofouling and seawater corrosion ensures long service life in shipbuilding and naval applications.
Used for bolting in evaporator chambers, brine heaters, and seawater intake structures, Cupro Nickel 90/10 bolts withstand high chloride concentrations and resist scaling and fouling, making them ideal for reverse osmosis and multi-stage flash desalination plants.
Flange bolts and stud bolts for firewater systems, riser clamps, and splash zone structural connections where resistance to seawater, brine, and marine atmospheres is critical. Cupro Nickel 90/10 bolts are non-sparking and suitable for hazardous areas.
Bolts for steam condenser waterboxes, cooling water intake screens, and heat exchanger channel covers in power plants, where resistance to brackish water and biofouling is essential for reliable operation.

Cupro Nickel 90/10 Bolts Standards & International Certifications

Cupro Nickel 90/10 Bolts 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 931 DIN 933 ISO 4014 ISO 4017 ASME B18.2.1 BS 1768 BS 3692 IS 1364 IS 1367
Certifications
ISO 9001:2015NABL LabPED 2014/68/EUMTC 3.1 / 3.2

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

Partner with RealBolt — India’s leading manufacturer of certified Cupro Nickel 90/10 Bolts — 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 90/10 Bolts — Frequently Asked Questions

Browse expert answers to common questions about Cupro Nickel 90/10 Bolts 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 bolts selection and pricing.
Cupro Nickel 90/10 bolts are available to DIN 931 (metric partial thread), DIN 933 (metric full thread), ISO 4014/4017, and ASME B18.2.1 (inch hex and heavy hex). Stud bolts for flanges are supplied per ASME B16.5 or MSS SP-75. Custom thread forms (BSW, BSF, Whitworth, BSPP) can be manufactured on request with a typical lead time of 2-3 weeks.
Use copper-based anti-seize compound (such as Molykote Cu-7439 or Loctite LB 8008 C5-A) for Cupro Nickel 90/10 bolts. Apply to threads and nut bearing faces to prevent galling and facilitate disassembly. Avoid nickel-based or graphite-based anti-seize, as these may cause galvanic corrosion with copper alloys.
Yes – Cupro Nickel 90/10 bolts are specifically designed for continuous immersion in seawater and brine. They resist pitting, crevice corrosion, and biofouling, making them ideal for marine, desalination, and offshore applications. No additional coating or cathodic protection is required for most marine environments.
No formal MOQ for standard sizes (M8-M36) held ex-stock – we supply from single pieces for urgent repairs or maintenance. Custom sizes or non-standard threads typically require a 10 kg minimum. Flange stud bolt sets are supplied as matched sets with no minimum. Quantity price breaks at 50 pcs, 200 pcs, and 500 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