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Cupro Nickel 90/10 Screws Manufacturer & Exporter in India

Explore Cupro Nickel 90/10 Screws 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 Screws?

Cupro Nickel 90/10 screws are corrosion-resistant fasteners manufactured from a copper-nickel alloy containing 90% copper and 10% nickel, designated as UNS C70600. These screws 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 toughness and ductility make Cupro Nickel 90/10 screws ideal for marine, desalination, and heat exchanger applications where both mechanical strength and long-term corrosion resistance are critical.

With excellent thermal conductivity and resistance to hydrogen embrittlement, Cupro Nickel 90/10 screws are widely specified for use in shipbuilding, offshore platforms, and chemical processing plants. They are compliant with international standards such as ASTM B151, DIN 2.0872, and BS 2872, ensuring reliable performance in the harshest environments.

Quick Specifications

MaterialCupro Nickel 90/10
UNS NumberC70600
DIN Number2.0872
Material StandardASTM B151
Screw Standard (Metric)DIN 963 / DIN 965 / ISO 7046
Screw Standard (Inch)ASME B18.6.3
Thread FormISO Metric / UNC / UNF
Diameter RangeM3-M36 / 1/8"-1½"
Tensile Strength245 MPa (35.5 ksi) min
Yield Strength105 MPa (15 ksi) min
HardnessMax 80 HRB / 150 HB
? 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 Nuts, 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 Nuts
Cupro Nickel 90/10 Washers
Cupro Nickel 90/10 Studs
Cupro Nickel 90/10 Threaded Rods

Technical Data

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

Cupro Nickel 90/10 Screws are available in metric M6–M100 and inch ¼″–4″ as standard. Per DIN 963 (slotted countersunk), DIN 965 (cross recessed), ISO 7046, and ASME B18.6.3. Custom lengths available in 5mm increments. Inch dimensions per ASME B18.6.3. All Cupro Nickel 90/10 screws dimensions conform to applicable DIN, ISO, and ASME B18 standards.

Machine Screw Dimensions - Metric (DIN 963 / DIN 965 / ISO 7046)

Size (M)Pitch (mm)Head Dia (mm)Head Ht (mm)Min L (mm)Max L (mm)
M30.55.61.65640
M40.77.52.2860
M50.89.22.51080
M61.011.03.012100
M81.2514.54.016120
M101.518.05.020150
M121.7522.06.025200
M162.028.08.030250
M202.535.010.040300
M243.041.012.050400
M303.550.015.060500
M364.060.018.080600

Dimensional & Material Standards

StandardCoversThread
DIN 963Slotted countersunk screwsMetric
DIN 965Cross recessed countersunk screwsMetric
ISO 7046Countersunk head screwsMetric
ASME B18.6.3Machine screwsUNC/UNF
BS 4183Slotted cheese head screwsMetric
Material StandardRequirement
ASTM B151Bar/rod - UNS C70600
ASTM B151MMetric bar/rod
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 Screws 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
Other elements (each)0.05% max
Other elements (total)0.30% max
? All heats verified by NABL-accredited spectrometry. PMI and full chemical analysis available on request.

Why Cupro Nickel 90/10 Alloy Composition Matters for Screws

Nickel (9–11%) — Seawater Corrosion Resistance
Nickel content in Cupro Nickel 90/10 screws provides outstanding resistance to seawater corrosion, making them ideal for marine and desalination plant fastenings exposed to chlorides and biofouling.
Iron & Manganese — Strength & Erosion Resistance
Iron and manganese additions improve mechanical strength and resistance to impingement attack, ensuring screws maintain integrity in high-velocity seawater and turbulent flow conditions.
Low Impurity Levels
Strict control of lead, zinc, and other impurities ensures Cupro Nickel 90/10 screws are suitable for potable water and critical process applications, meeting international safety and performance standards.

Fastener Performance

Cupro Nickel 90/10 Screws Mechanical Properties & Torque Reference

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

Screw SizeDry (Nm)Lubricated (Nm)Clamp Load (kN)
M65.54.54.0
M813107.5
M10262112.0
M12453617.0
M161108830.0
M2022017648.0
M2438030470.0
?? Anti-galling: Use molybdenum-based or nickel-based anti-seize. Lubricated values assume K=0.16. Avoid copper-based anti-seize in seawater applications.

Industry Applications

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

Cupro Nickel 90/10 Screws 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 screws are the preferred choice for hull fittings, seawater piping, deck hardware, and underwater fastenings in shipbuilding due to their outstanding resistance to biofouling and seawater corrosion. Approved by major classification societies for marine use.
Used for securing tube sheets, baffles, and structural components in desalination plants, Cupro Nickel 90/10 screws withstand brine, chlorinated water, and high-velocity flows, ensuring long-term reliability in reverse osmosis and multi-stage flash systems.
Cupro Nickel 90/10 screws are specified for tube-to-tube sheet connections, channel covers, and water box fastenings in heat exchangers and condensers, especially in power plants and petrochemical facilities where resistance to erosion and stress corrosion is vital.
Ideal for fastening splash zone structures, riser clamps, and cable trays, Cupro Nickel 90/10 screws provide robust performance in offshore environments exposed to salt spray, tidal immersion, and fluctuating temperatures.

Cupro Nickel 90/10 Screws Standards & International Certifications

Cupro Nickel 90/10 Screws 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 912 DIN 913 DIN 914 DIN 915 DIN 916 ISO 4762 ISO 10642 ASME B18.3 EN ISO 4762 IS 1367
Certifications
ISO 9001:2015NABL LabPED 2014/68/EUMTC 3.1 / 3.2

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

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

Browse expert answers to common questions about Cupro Nickel 90/10 Screws 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 screws selection and pricing.
Cupro Nickel 90/10 screws are available to DIN 963 (slotted countersunk), DIN 965 (cross recessed), ISO 7046, and ASME B18.6.3 (inch machine screws). Other forms such as cheese head, pan head, and socket head are available per BS 4183 and ISO 14581. Custom thread forms and dimensions can be supplied on request.
Use a molybdenum-based or nickel-based anti-seize compound (such as Molykote 1000 or Jet-Lube Marine Grade) on threads and under the head to prevent galling and facilitate removal. Avoid copper-based anti-seize in seawater or brine environments to prevent galvanic corrosion.
Yes – Cupro Nickel 90/10 screws are specifically engineered 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 uses.
No formal MOQ for standard metric and inch sizes (M3-M16) held in stock – we supply from single pieces for urgent repairs. Custom sizes or non-standard heads may require a 10 kg minimum. Bulk 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