Buying Cupro Nickel Fastener? Here Is Why Buyers Choose Ganpat Industrial
Seawater-Grade 90/10 & 70/30 CuNi
Made to the exact ASTM B151 Cu-Ni ratio required.
PMI & Spectro Checked Heats
Every heat is checked for copper, nickel and iron ratio.
Hex, Square & Allen Stock Ready
Hex, square and Allen styles available in required thread classes.
Full Heat-Wise Traceability
Every fastener carton is linked to its mill test certificate.
Ready Stock, Fast Dispatch
M6 to M56 sizes ready for quick machining, marking and dispatch.
Cupro Nickel Fastener Snapshot
- 1Fastener Family: Bolts, Nuts, J Bolts, Coupling Nuts, Studs & Threaded Bar
- 2Size Coverage: M6 to M56 | 1/4″ to 2″ UNC / UNF
- 3Governing Standard: ASTM B151, UNS C70600 (90/10) & UNS C71500 (70/30)
- 4Surface Options: Hot Forged, Annealed, Bright, Passivated
- 5Trade Names: Cupro Nickel, Copper Nickel, Cu-Ni, CuNi Alloy
- 6Service Use: Shipbuilding, Desalination, Offshore Platform & Seawater Piping
Or call our Mumbai office: +91 22 6743 7134 • Cupro Nickel batches dispatched with heat-wise MTC
Our fastener shop starts every order from certified UNS C70600 and UNS C71500 copper-nickel bar. The exact chemistry buyers ask for when a joint sits below the waterline. We forge, thread, inspect and certify each Copper Nickel Bolts and Copper Nickel Nuts lot before it leaves the works. Keeping the copper-to-nickel balance inside the ASTM B151 window on every heat. Backed by this process control, we stand as a dependable source of Cupro Nickel Fastener in India. Trusted by shipyards, desalination plants, and offshore fabricators where joint reliability matters. Our range includes Cupro Nickel Bolt, Cupro Nickel Nut, Cu-Ni Stud Bolts, and Cu-Ni Threaded Bar, available in metric and imperial threads.
Mumbai · Copper-Nickel Marine Alloy Fastener Exporter
Cupro Nickel Fastener – Built to Resist Seawater
Ganpat Industrial forges, threads and certifies Copper Nickel Bolts, Cupro Nickel Nut and Cu-Ni Stud Bolts for buyers who need a joint that will not rust, pit or seize after years under seawater, brine or humid coastal air across India, the GCC and Southeast Asia.
- ✓ISO 9001:2015
- ✓ASTM B151 Certified Chemistry
- ✓UNS C70600 / C71500 Traceable
- ✓Mill Test Certificate 3.1
- ✓Third-Party Inspection Approved
Rust-proof ASTM B151 Cupro Nickel Hex Head Manufacturer in India at Best Prices
Cupro Nickel Fasteners Specification
Copper Nickel Bolts & Cupro Nickel Allen Bolt Range
- Size: M6 – M56 (1/4″ – 2″ UNC/UNF)
- Copper Nickel Bolts & Cupro Nickel Allen Bolt, Full & Half Thread
- Length: 15mm to 400mm, custom on drawing
- Standard & metric plus custom sizes
ASTM B151 Cupro Nickel Hex Head Bolt Standard
- ASTM B151 Copper-Nickel Bar & Bolt Stock
- UNS C70600 (90/10) & C71500 (70/30) Reference
- ASME B18.2.1 Hex Bolt Dimension Match
- MSS SP-25 Marking Compliance
Cu-Ni Stud & Cu-Ni Stud Bolts Range
- Cu-Ni Stud: M6 – M56, Full & Reduced Shank
- Annealed & Pickled Finish
- Continuous & Double-End Stud Thread
- Precision Rolled Or Cut Thread
Cupro Nickel Nut, Copper Nickel Nuts & CuNi Dome Nuts
- ASTM B151 Cupro Nickel Nut, Hex & Heavy Hex Style
- CuNi Dome Nuts & Cupro Nickel Shoulder Nuts On Request
- Thread Class 2B / 6H Standard Fit
- Cupro Nickel Coupling Nut & Self-Locking Options
Cupro Nickel Industrial Threaded Bar
- Cupro Nickel Threaded Bar Length: Up To 3 Meters
- Full-Length Or Custom-Cut Thread
- UNC / UNF / Metric Coarse Thread
- PMI Tested Before Threading
Cupro Nickel J Bolt, Square Bolts & Coupling Nut
- Cupro Nickel J Bolt In L & U Hook Style
- Cupro Nickel Square Bolts For Timber & Deck Fittings
- Cupro Nickel Coupling Nut, Long & Short Body
- Custom Drawing Match On Request
90/10 Vs 70/30 Cupro Nickel Fastener – Which Grade To Pick?
90/10 Cupro Nickel (C70600)
- Lower cost, easier to machine
- Good corrosion resistance
- Preferred for hull fittings
- Standard choice for most marine orders
70/30 Cupro Nickel (C71500)
- Higher nickel content lifts strength
- Better performance in high-velocity
- Preferred for condenser & heat exchanger
- Recommended for critical offshore applications
How Long Does Cupro Nickel Fastener Last In Seawater?
Splash Zone Service Life
15 – 20 Years
C70600 Copper Nickel Bolts, typical
Full Immersion Service Life
20 – 25+ Years
C71500 Cupro Nickel Nut, typical
Corrosion Rate In Seawater
< 0.025 mm/yr
Steady-state, after initial film forms
Protective Film Formation
60 – 90 Days
Time for stable oxide layer to build
Types Of Cupro Nickel Fasteners We Supply
As an active supplier to shipyards, desalination and offshore fabricators, we hold every Copper Nickel Bolts in ready stock.
Copper Nickel Bolts
ASTM B151
Cupro Nickel J Bolt
L / U Hook
ASTM B151 Cupro Nickel Hex Head Bolt
ASME B18.2.1
Cupro Nickel Square Bolts
Deck Fitting
Cu-Ni Stud
Continuous Thread
Cupro Nickel Coupling Nut
Long / Short Body
CuNi Dome Nuts
Acorn Style
Cupro Nickel Nut
Hex / Heavy Hex
Buy Ready Stock of Copper Nickel Bolts and Nuts in Metric Sizes for Tough Marine Environments
ASTM B151 Cupro Nickel Hex Bolt Size Chart
As a trusted Cupro Nickel Fastener manufacturer in India we offer fasteners in various sizes & thread
| Bolt Size | Across Flats (mm) | Head Height (mm) | Thread Pitch (mm) |
|---|---|---|---|
| M8 | 13.0 | 5.5 | 1.25 |
| M10 | 17.0 | 7.0 | 1.50 |
| M12 | 19.0 | 8.0 | 1.75 |
| M16 | 24.0 | 10.0 | 2.00 |
| M20 | 30.0 | 13.0 | 2.50 |
| M24 | 36.0 | 15.0 | 3.00 |
ASTM B151 Cupro Nickel Hex Head Bolt Weight Chart (Kg Per Piece)
Approximate weight for Cupro Nickel Bolts, Cupro Nickel Studs & Cu-Ni Stud Bolts – confirm exact figure against your mill test certificate.
M12 x 50mm Hex Bolt
~0.045 kg/pc
C70600, full thread
M16 x 60mm Hex Bolt
~0.095 kg/pc
C70600, full thread
M20 x 70mm Hex Bolt
~0.185 kg/pc
C71500, full thread
M24 x 80mm Stud Bolt
~0.34 kg/pc
C71500, with 2 nuts
Weekly Delivery Of Cupro Nickel Fastener In Below Countries
| Export To | Continent | Shipping Time |
|---|---|---|
Mexico |
North America | 45 Days |
South Africa |
Africa | 25-30 Days |
Kenya |
Africa | 19 Days |
Oman |
Asia | 5 Days |
Does Cu-Ni Nuts Resist Marine Biofouling & Barnacle Growth?
Slow Copper-Ion Release
Cupro Nickel Nut and bolt surfaces shed trace copper ions that discourage barnacle settlement
Lower Marine Growth Buildup
Copper Nickel Nuts foul far slower than steel or stainless fittings in the same splash zone
Cuts Underwater Maintenance
Fewer cleaning cycles for Cupro Nickel Bolt fittings on hulls, cages and intake screens
Application Of Copper Nickel Bolts, Nuts & Threaded Bar
Our regular monthly volumes across these sectors keep buyers coming back to us for repeat orders.
Shipbuilding Hull & Deck Fittings
Seawater Desalination Plant Piping
Offshore Platform Structural Joints
Condenser & Heat Exchanger Tube Sheets
Marine Firefighting & Ballast Systems
Fish Cage & Aquaculture Structures
Coastal Bridge & Jetty Fastening
Seawater Intake Screen Assemblies
Torque Chart For Cupro Nickel Hex Bolts & Cu-Ni Stud Bolts
| Bolt Size | Torque – Dry (Nm) | Torque – Lubricated (Nm) |
|---|---|---|
| M8 | 14 | 11 |
| M10 | 28 | 21 |
| M12 | 48 | 36 |
| M16 | 118 | 89 |
| M20 | 230 | 172 |
| M24 | 400 | 300 |
Need A Torque Value For A Non-Standard Size?Share bolt size, grade & joint condition – we calculate and confirm.
Testing Methods For Cupro Nickel Square Bolts
Every batch that leaves our facility upholds our reputation as a reliable Cupro Nickel Fastener Supplier in India .
Hardness Test
Confirms Rockwell hardness of every Cupro Nickel Bolt stays within grade limit
Every Batch
Tensile & Proof Load Test
Checks that each Copper Nickel Bolts lot meets rated proof and breaking load
Bolt Lots
Chemical Analysis – Spectro Test
Spectrometer reading verifies Cu, Ni & Fe against the grade chemistry
Every Heat
Salt Spray / Seawater Corrosion Test
ASTM G31 style exposure confirms Cupro Nickel Nut resistance in brine
On Request
Positive Material Identification (PMI)
Handheld alloy analyzer confirms grade on the finished fastener body
Every Order
Micro & Macro Structure Test
Microscopic and visual check rules out cracks, laps or seams
On Request
Monthly Delivery Of Cupro Nickel Fastener In Below Countries
| Export To | Continent | Shipping Time |
|---|---|---|
Colombia |
South America | 45 Days |
Morocco |
Africa | 45 Days |
Peru |
South America | 45 Days |
Algeria |
Africa | 45 Days |
Chemical Composition Of Cupro Nickel Square Bolts
Reference chemistry for the Cupro Nickel fastener grade family as per ASTM B151.
| Grade | Cu | Ni | Fe | Mn | Pb | Zn |
|---|---|---|---|---|---|---|
| C70600 (90/10 CuNi) | Bal. (86.5 Min) | 9.0-11.0 | 1.0-1.8 | 1.0 Max | 0.05 Max | 1.0 Max |
| C71500 (70/30 CuNi) | Bal. (63.75 Min) | 29.0-33.0 | 0.40-1.00 | 1.0 Max | 0.05 Max | 1.0 Max |
Mechanical Properties Of ASTM B151 Cupro Nickel Bolts
Tensile Strength
≥ 365 MPa
53 ksi Min, C71500 Annealed
Yield Strength (0.5%)
≥ 140 MPa
20 ksi Min, C71500 Annealed
Elongation
≥ 30%
High Ductility
Hardness (Max)
≤ 95 HRB
Annealed / Marine-Safe
Need A Certified Tensile & Hardness Report?Send size, quantity & standard for a free document review.
ASTM B151 Cupro Nickel Fasteners Equivalent Grades
ASTM / UNS
- ASTM B151 Copper-Nickel Bar & Bolt Stock
- UNS C70600 (90/10 CuNi) Reference
- UNS C71500 (70/30 CuNi) Reference
- MIL-C-15726 Marine Fastener Reference
DIN / WNr
- WNr 2.0872, DIN CuNi10Fe1Mn (90/10)
- WNr 2.0882, DIN CuNi30Mn1Fe (70/30)
- DIN 86019 Marine Fastener Reference
BS / Trade Name
- BS 2870 CN102 Reference (90/10 CuNi)
- BS 2870 CN107 Reference (70/30 CuNi)
- Sold Globally As Copper Nickel / Cu-Ni Nuts & Fastener
Test Certification Of ASTM B151 Cupro Nickel Nut
Mill Test Certificate 3.1
Chemistry, hardness & tensile results traced to heat number
Every Order
PMI Test Report
Positive Material Identification confirming Cu, Ni & Fe content
On Request
Seawater Corrosion Test Report
Immersion and salt spray results shared on request for offshore orders
On Request
Certificate Of Origin
For customs clearance & import duty processing
Export Orders
Need A Third-Party Witnessed Test Certificate?We coordinate SGS, Bureau Veritas or TUV inspection on request.
Surface Finish For Copper Nickel Bolts And Nuts
As-Forged / Hot Rolled Blank
Base finish before final machining and thread rolling
Annealed & Pickled
Acid pickling removes heat scale and brightens the copper surface
Bright / Polished Finish
Smooth surface for visible deck fittings and instrument-line joints
Natural Protective Patina
A thin oxide film forms in service and shields against further corrosion
Passivated Finish
Chemical passivation strengthens resistance before long-term seawater exposure
Cupro Nickel Bolt Vs Stainless Steel 316 Bolt – Which To Choose?
Cupro Nickel Bolt
- Better long-term resistance in still or low-flow seawater
- Naturally non-magnetic, no crevice corrosion risk in brine
- Slower biofouling build-up on exposed threads
- Preferred for hull, jetty & desalination fittings
Stainless Steel 316 Bolt
- Higher tensile and yield strength for structural loads
- Lower material cost per kilogram on large orders
- Wider global stock availability in standard sizes
- Preferred where magnetic neutrality is not critical
Not Sure Which Alloy Fits Your Joint?Share your process fluid & environment – we confirm the right fastener grade.
How To Identify Genuine Grade Of Cupro Nickel Fastener Head?
Check Grade & Heat Stamp
Head or end face should carry alloy grade, heat number & manufacturer mark
Step 1
Match PMI Reading To MTC
Cu, Ni & Fe reading on the fastener body must match certificate values
Step 2
Verify Thread Class Fit
Thread should gauge cleanly to Class 2B / 6H without forcing or slack
Step 3
Confirm Third-Party Inspection
SGS, BV or TUV report confirms independently witnessed test results
Step 4
Cupro Nickel Fastener MOQ & Lead Time For Export Orders
Ready-Stock Sizes
No MOQ
Fast-moving M6 to M24 sizes
Custom Drawing Orders
50 – 100 Kg
Typical minimum for special sizes
Ready-Stock Dispatch
3 – 7 Days
From order confirmation
Custom Order Lead Time
15 – 25 Days
Forging, threading & testing included
Need Full Batch Chemistry Before You Order?We share the spectro report along with every quotation on request.
Packing & Export Documentation For Cupro Nickel Fasteners
Secure packaging by a trusted Cupro Nickel Fastener Supplier in India.
Wooden Crate / Poly Bag Packing
Grade & Heat Number Tagging
Packing List, Invoice & COO
FCL / LCL Sea & Air Freight
Frequently Asked Questions
What is the price of Cupro Nickel Fastener per kg?
Price depends on grade, size and quantity – share drawing for an exact quote.
Which sizes does ASTM B151 Cupro Nickel Hex Head Bolt come in?
Stocked from M6 to M56 in metric and UNC threads with custom lengths.
Is Cu-Ni Stud Bolt magnetic in nature?
No, copper-nickel alloy remains non-magnetic across nearly all standard marine service temperatures.
Who supplies certified Cupro Nickel Nut for export orders?
Ganpat Industrial forges, machines and certifies every Cupro Nickel Nut batch with full traceability.
What documents ship with Cupro Nickel Threaded Bar orders?
Every order includes mill test certificate, PMI report, packing list and invoice copy.
We Collaborate With Traders in the Following Locations
| Morocco | Kenya | Gabon | Houston | Dubai | Tunisia |
| Abu Dhabi | South Africa | Nigeria | Mozambique | USA | Oman |
| Saudi Arabia | Riyadh | Dammam | Al-khobar | UAE | Al Jubail |
| Angola | Ethiopia | Egypt | Zambia | Ghana | Tanzania |
| New South Wales | Indiana | Texas | California | Algeria | Carolina |
6 Reasons to choose Ganpat Industrial Corporation
- Distributor of Heat Exchanger parts and Alloys for High Temperature applications.
- Stockholder and importer of Ferrous and non ferrous metals.
- Wide stock of prime quality austenitic and Ferritic Stainless Steel for Extreme pressure environment.
- Marine grade steel at lowest price in Mumbai.
- Compare Price per KG in India and China.
- Offer Resale price to local suppliers, traders and wholesalers in UAE, Saudi Arabia, Egypt, and USA