Higher nickel content gives Copper Nickel 70/30 Bolts extra strength over 90/10. That extra strength matters most in fast-moving seawater, ballast lines and condenser bolting.
Oshwin Overseas forges and machines UNS C71500 hex bolts, U-bolts, stud bolts and threaded rod in Mumbai, India. We've shipped everything from small hex-cap-screw sets to a 16,560-piece U-bolt order for US marine buyers. Common sizes stay in stock for fast turnaround. Oshwin ships to South Korea, Kuwait, Netherlands and Mexico.
Built for High-Flow Seawater
Outlasts 90/10 where erosion-corrosion from fast-moving water is a risk.
M4-M56 At the Warehouse
Small hex-cap-screw sets and bulk U-bolt runs, both shipped ex-Mumbai.
Strength
- Grade
- UNS C71500
- Standard
- ASTM F468 / B151
- Size Range
- M4-M56 / &frac316;″-2″
- Tensile
- 310 MPa min
- MTC
- EN 10204 3.1
- Lead Time
- 2-5 Days
Copper Nickel 70/30 U-Bolts, Hex Nuts & Fasteners Manufacturer in India for Marine Piping Systems
Cu-Ni 70/30 Threaded Rod & Custom-Diameter Fasteners Machined to ASTM F468 UNS C71500
Table of Contents
- Copper Nickel 70/30 Bolts Specification
- Cupro Nickel 70/30 Fasteners - Every Type We Supply
- ASTM B151 UNS C71500 Fasteners Chemical Composition
- Cu-Ni 70/30 Bolts Mechanical Properties & Tensile Strength
- Copper Nickel 70/30 vs 90/10 - Choosing the Right Grade for High-Velocity Seawater Bolting
- UNS C71500 Bolts Equivalent Grades
- Alloy 715 U-Bolts for Marine Pipe Supports & Coupling Assemblies
- Cupro Nickel 70/30 Bolts Torque & Anti-Seize Guidance
- DIN 2.0882 CuNi30Mn1Fe Bolts Naval & Defense Compliance
- Common Cu-Ni 70/30 Fastener Enquiries We Handle
- Applications of Copper Nickel 70/30 Bolts
- FAQs
Copper Nickel 70/30 Bolts Specification
70/30's extra nickel makes it harder than 90/10. Cold heading covers a slightly narrower size band here before the line switches to hot forging.
Cold Headed
M4-M30 / 3/16″-1-3/16″, lengths 3-180mm
Hot Forged
M30-M56 / 1-3/16″-2″, lengths up to 400mm
Certification
EN 10204 3.1 Material Test Certificate
Compliance
MIL-C-15726 on request for naval and defense orders
Service Range
Up to 300°C (572°F), -20°C low-temp rated
Hex Bolt Dimensions
Head size, width-across-flats & thread length per ASME B18.2.1
Thread Tolerance
Coarse (UNC), Fine (UNF), Metric ISO
Raw Material Stock
ASTM B151 rod, cross-referenced to DIN 86019 for marine piping systems
Sizes Buyers Order Most
U-bolts bent to your pipe OD on request. Fine-pitch UNC/UNF threads confirmed before dispatch.
Fast Quote Turnaround - send us size, standard and quantity, we'll price it ex-Mumbai the same day.
Copper Nickel 70/30 Bolts Manufacturer in India - From 5/8″ HHCS Sets to 16,000+ Piece U-Bolt Runs
Every batch, small or bulk, ships with a mill-traceable heat number.
Get a Bolt QuoteCupro Nickel 70/30 Fasteners - Every Type We Supply
Every type below ships from stock or gets cut to your drawing at our Mumbai plant. Socket head cap screws and odd head styles are machined on request.
Looking for Copper Nickel 70/30 fasteners or Copper Nickel 70/30 Stud Bolts in a size not shown here? Send your drawing and we'll quote it. Copper Nickel 70/30 hex nuts and Copper Nickel 70/30 washers ship matched to the bolt set. Same batch, same finish.
ASTM B151 UNS C71500 Fasteners Chemical Composition
The near-triple nickel content, next to 90/10, is what gives 70/30 its higher strength and better erosion resistance.
Cu-Ni 70/30 Bolts Mechanical Properties & Tensile Strength
Values are for annealed bar per ASTM B151. Cold-worked tempers run higher - check your mill certificate for the exact temper.
Copper Nickel 70/30 vs 90/10 - Choosing the Right Grade for High-Velocity Seawater Bolting
Not sure which grade your drawing calls for? Send it over and we'll confirm before we quote.
UNS C71500 Bolts Equivalent Grades
Copper Nickel 70/30 Bolts Exporter in India - US Navy & Gulf Coast Shipments
Virginia shipyards and Texas buyers order direct from our Mumbai stock.
Request Export PricingAlloy 715 U-Bolts for Marine Pipe Supports & Coupling Assemblies
Send your pipe OD, thread size and inside-to-thread length, and we'll quote your U-bolt run.
Cupro Nickel 70/30 Bolts Torque & Anti-Seize Guidance
Torque follows T = K × F × d. Clamp load (F) and diameter (d) come from your design. K is a friction number set by the lubricant.
Lubricated Threads
A lower K value means less torque for the same clamp load
Anti-Seize Recommended
Especially useful when mated to a stainless nut or washer
Torque Formula
T = K × F × d - dry K runs roughly a third higher than lubricated
Buyer-Specified Torque
Tell us the clamp load your design needs and we'll work back to a torque figure
Common Cu-Ni 70/30 Fastener Enquiries We Handle
5-inch, 10-bolt weld-neck flange bolt set in Copper Nickel 70/30 - Virginia, USA shipyard order.
16,560-piece bulk U-bolt order - UNS C71500, M12 thread, OD 60.3mm, 4 nuts each, 90mm length.
64-piece heavy U-bolt run - Cu-Ni 70/30, M20 thread, OD 219.1mm, 4 nuts each, 275mm length.
US distributor question - a Laredo, Texas buyer asked if we have USA-based CuNi 70/30 stockists.
Small hex-cap-screw and lock-nut set - Alloy 715, 5/8-11 x 3″, 12 pieces, Norfolk, Virginia.
Applications of Copper Nickel 70/30 Bolts
Naval & Defense Seawater Systems
Shipbuilding & Hull Fittings
Desalination Plant Piping
Condenser & Heat Exchanger Bolting
Offshore Platform Hardware
Copper Nickel 70/30 Fastener Value-Added Services
Stock supply is only part of what we offer on this grade. These operations run in-house at our Mumbai facility.
Drilling
Tapping
Threading
U-Bolt Bending
Chamfering
Turning
Pipe Threading
Custom Cut-to-Length
Pickling & Descaling
We don't offer zinc plating or hot-dip galvanizing on this alloy. The copper-nickel oxide film already protects it, so plating adds no benefit.
Copper Nickel 70/30 Manufacturing Capability
The higher nickel content that boosts strength also raises hardness. That shifts the cold-heading crossover slightly earlier than on softer 90/10 stock.
| Process | Size Range | Typical Length |
|---|---|---|
| Cold Formed | M4-M30 / 3/16″-1-3/16″ | Up to 180mm |
| Hot Forged & CNC Machined | M30-M56 / 1-3/16″-2″ | Up to 400mm |
| U-Bolt Bending | OD 20mm-300mm | Cut to drawing |
This is a general guide - confirm the exact crossover for your specific size against your drawing.
UNS C71500 Bolts Standards Compliance
Third-party inspection and full heat traceability are available on any Copper Nickel 70/30 order.
Copper Nickel 70/30 Bolts Supplier in India for Naval & Offshore Projects
High-velocity seawater tested stock, ready to ship worldwide.
Talk to Our TeamOur Export Network
Real enquiries for this grade lean heavily US - Virginia shipyards, Texas distributors, Gulf Coast buyers. As both manufacturer and distributor, Oshwin ships direct from Mumbai stock to your port.
Americas
USA
Canada
Europe & UK
United Kingdom
Germany
Netherlands
Belgium
Turkey
Middle East
Saudi Arabia
UAE
Oman
Qatar
Kuwait
Southeast & South Asia
Singapore
Australia
South Korea
Malaysia
Thailand
Indonesia
Philippines
Vietnam
Africa
Nigeria
South Africa
Egypt
Recent Copper Nickel 70/30 Bolt Export Supplies
Mumbai
Virginia, USA
Product: UNS C71500 Weld-Neck Flange Bolt Set
Size: 5″ flange, 10-bolt pattern
Mumbai
USA
Product: Cu-Ni 70/30 U-Bolts with Nuts
Size: M12, OD 60.3mm, 16,560 pcs
Mumbai
USA
Product: Alloy 715 U-Bolts with Nuts
Size: M20, OD 219.1mm, 64 pcs
Mumbai
Norfolk, VA
Product: Copper Nickel 70/30 HHCS & Nylon Lock Nut
Size: 5/8-11 x 3″, 12 each
Mumbai
Laredo, TX
Product: UNS C71500 Bolt & Nut Distributor Enquiry
Size: Direct-ship arrangement confirmed
Delivery Estimate From Ready Stock
Mumbai Dispatch
Ready-stock U-bolts, hex bolts and nuts leave the warehouse within 2-5 days
Ocean Freight
Best value for bulk U-bolt runs, 18-30 days port to port
Air Freight
Good fit for small HHCS sets or urgent repair orders
Confirm Your ETA
Tell us your destination port for a firm shipping date
USA (East Coast)20-26 daysUSA (Gulf Coast)24-30 daysUAE10-15 daysSingapore10-16 daysUK18-25 daysQuoted in port-to-port sea transit days. Air freight usually cuts that time by more than half.
FAQs - Copper Nickel 70/30 Bolts
CuNi 70/30 fasteners carry more nickel, so they're stronger and handle fast-moving water better. 90/10 works fine for calmer seawater. For high-flow lines like ballast systems or condensers, go with 70/30 fasteners.
B151 covers the raw copper-nickel bar. F468 sets the finished bolt's strength and dimensions. On a purchase order, write ASTM F468 UNS C71500.
No. F2281 covers high-temperature stainless and nickel-alloy bolts, not copper alloys. For Copper Nickel 70/30, ASTM F468 UNS C71500 is the correct fastener spec.
Torque depends on your clamp load, bolt size and mating nut. Send us the joint details and application, and we'll confirm a safe figure.
Yes. We ship direct from Mumbai stock to US ports, no local distributor needed. We've supplied Virginia shipyards and Texas buyers this way.
Our stock runs M4 through M56 in metric, 3/16 inch through 2 inch in imperial. Every U-bolt gets bent and threaded to your exact OD and length.