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Cupro Nickel 70/30 Studs Manufacturer & Exporter in India

Explore Cupro Nickel 70/30 Studs 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 Studs?

Cupro Nickel 70/30 studs are threaded fasteners manufactured from a copper-nickel alloy containing 70% copper and 30% nickel, designated as UNS C71500. These studs 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 alloy’s inherent strength and ductility make Cupro Nickel 70/30 studs ideal for marine, offshore, and desalination plant applications where reliability in harsh environments is critical.

With excellent thermal stability and resistance to erosion and impingement attack, Cupro Nickel 70/30 studs are widely specified for heat exchanger tube sheets, condenser assemblies, and piping flanges in shipbuilding and power generation. All fasteners are supplied with full traceability and certified to international standards.

Quick Specifications

MaterialCupro Nickel 70/30
UNS NumberC71500
DIN Number2.0882
Material StandardASTM B151 / B151M
Stud Standard (Metric)DIN 976 / DIN 975
Stud Standard (Inch)ASME B16.5 / B18.31.2
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 IGC test 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 Washers, 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 Washers
Cupro Nickel 70/30 Threaded Rods

Technical Data

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

Cupro Nickel 70/30 Studs are available in metric M6–M100 and inch ¼″–4″ as standard. Per DIN 976 (fully threaded) / DIN 975 (threaded rod) / ASME B16.5 (flange studs). Custom lengths available in 10mm increments. Inch dimensions per ASME B18.31.2. All Cupro Nickel 70/30 studs dimensions conform to applicable DIN, ISO, and ASME B18 standards.

Stud Dimensions - Metric (DIN 976)

Size (M)Pitch (mm)Thread Length (mm)Min L (mm)Max L (mm)
M61.0Full201000
M81.25Full252000
M101.5Full302000
M121.75Full402000
M162.0Full502000
M202.5Full602000
M243.0Full802000
M303.5Full1003000
M364.0Full1203000
M424.5Full1403000
M485.0Full1603000
M565.5Full1803000
M646.0Full2003000

Dimensional & Material Standards

StandardCoversThread
DIN 976Fully threaded studsMetric
DIN 975Threaded rodsMetric
ASME B16.5Stud bolts for flangesUNC
ASME B18.31.2Continuous thread studsUNC/UNF
ISO 898-1Mechanical propertiesMetric
Material StandardRequirement
ASTM B151Bar/rod - UNS C71500
ASTM B467Pipe/tube - UNS C71500
EN 12163Rod for general purposes
EN 10204 3.1Mill test certificate
EN 10204 3.2TPI-witnessed MTC

Material Chemistry

Cupro Nickel 70/30 Chemical Composition

Cupro Nickel 70/30 Studs 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)65.0-70.0%
Nickel (Ni) incl. Cobalt29.0-33.0%
Iron (Fe)0.4-1.0%
Manganese (Mn)1.0% max
Zinc (Zn)1.0% max
Lead (Pb)0.05% max
Phosphorus (P)0.02% max
Other elements0.30% max (total)
? All heats verified by NABL-accredited spectrometry. PMI and IGC test available on request.

Why Cupro Nickel 70/30 Alloy Composition Matters for Studs

Nickel (29–33%) — Seawater Corrosion Resistance
The high nickel content in Cupro Nickel 70/30 provides outstanding resistance to seawater corrosion, including resistance to biofouling and stress corrosion cracking, making these studs ideal for marine and desalination plant use.
Iron & Manganese — Erosion & Impingement Resistance
Iron and manganese additions enhance the alloy’s resistance to erosion and impingement attack, ensuring long service life for studs exposed to high-velocity seawater and turbulent flow conditions.
Copper (65–70%) — Thermal & Electrical Conductivity
The copper base ensures excellent thermal and electrical conductivity, making Cupro Nickel 70/30 studs suitable for heat exchanger and condenser assemblies where efficient heat transfer is required.

Fastener Performance

Cupro Nickel 70/30 Studs Mechanical Properties & Torque Reference

The table below lists mechanical properties and torque reference for Cupro Nickel 70/30 Studs per ASTM. Cupro Nickel 70/30 studs achieve 700 MPa tensile strength, with hardness, yield, and elongation values verified by NABL-accredited testing and reported in the EN 10204 MTC.

Stud SizeDry (Nm)Lubricated (Nm)Clamp Load (kN)
M12383013
M16756022
M2015012035
M2426020851
M3052041681
M36900720117
M4214001120160
M4821001680220
?? Anti-galling: Use nickel-based or molybdenum-based anti-seize. Lubricated values assume K=0.16. Avoid copper-based anti-seize in seawater applications.

Industry Applications

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

Cupro Nickel 70/30 Studs 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 studs are the preferred choice for hull penetrations, seawater piping flanges, and heat exchanger tube sheets in naval and commercial vessels. Their resistance to biofouling and seawater corrosion ensures long-term reliability in marine environments.
Studs for high-pressure flange connections, evaporator tube sheets, and brine heater assemblies in reverse osmosis and multi-stage flash desalination plants. Cupro Nickel 70/30 is specified for its resistance to chloride-induced corrosion and scaling.
Used in condenser waterboxes, cooling water intake structures, and heat exchanger assemblies in thermal and nuclear power plants. The alloy’s thermal conductivity and resistance to erosion by high-velocity water make it ideal for these applications.
Cupro Nickel 70/30 studs are used for riser clamps, splash zone piping, and firewater system flanges on offshore platforms, where resistance to seawater and marine atmosphere is critical for safety and longevity.

Cupro Nickel 70/30 Studs Standards & International Certifications

Cupro Nickel 70/30 Studs 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 938 DIN 939 DIN 976-1 ASME B18.31.2 BS 1768 IS 1364 IS 1367
Certifications
ISO 9001:2015NABL LabPED 2014/68/EUMTC 3.1 / 3.2

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

Partner with RealBolt — India’s leading manufacturer of certified Cupro Nickel 70/30 Studs — 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 70/30 Studs — Frequently Asked Questions

Browse expert answers to common questions about Cupro Nickel 70/30 Studs 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 studs selection and pricing.
Cupro Nickel 70/30 studs are available to DIN 976 (fully threaded metric), DIN 975 (threaded rod), ASME B16.5 (flange studs), and ASME B18.31.2 (inch continuous thread). Custom thread forms such as BSW, BSPP, and Whitworth can be supplied on request with a typical lead time of 2-3 weeks.
Nickel-based or molybdenum-based anti-seize is recommended for Cupro Nickel 70/30 studs, especially in marine and desalination service. Avoid copper-based anti-seize in seawater to prevent galvanic corrosion. Apply to threads and nut faces, and reduce torque by 20% for lubricated assembly.
Yes – Cupro Nickel 70/30 is specifically engineered for continuous seawater immersion, offering excellent resistance to pitting, crevice corrosion, and biofouling. It is the industry standard for marine, desalination, and offshore applications where long-term durability is required.
No MOQ for standard metric and inch sizes (M10-M36) held in stock – single pieces can be supplied for urgent repairs. Custom sizes or special threads typically require a 10 kg minimum. Price breaks are available 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