Here’s What Sets Ganpat Industrial Apart In Cupro Nickel 70/30 Washers
29-33% Nickel Heats
Mill-certified UNS C71500 chemistry on every batch
One PO, Full Range
Get flat spring disc wave or conical types. All on one single invoice.
Biofouling and Seawater Rated
ASTM B151 and B171 heats suit marine duty
Batch-Wise PMI Tested
Every lot screened before it leaves the factory
Quote In 24 Hours
Ready stock on standard bolt sizes. Dispatch happens the same week.
Cupro Nickel 70/30 Washer Overview
- 1Type: Flat, Spring, Conical Spring, Disc Spring, Wave Spring, Split Spring, Square Spring
- 2Size Range: M3 to M36 • OD 7 mm to 66 mm • per ISO 7089
- 3Common Grades: UNS C71500, DIN 2.0882, CuNi30Mn1Fe, AISI/CDA 715
- 4Finish: Bright Annealed, Pickled, Natural Mill Finish, Polished
- 5Standards: ASTM B151, ASME SB151, ASTM B171, DIN 17664, ISO 7089/7090
- 6Origin: Indian origin • European origin • Japanese origin
Call Mumbai office at +91 22 6743 7134. We offer fast dispatch on ready stock.
Cupro Nickel 70/30 Washers resist seawater corrosion well. They also resist chloride based corrosion fully. Marine and offshore environments suit them perfectly. Desalination plants also use these washers regularly. They follow the ASTM B151 standard closely. They keep strength during constant saltwater exposure. Dimensional accuracy stays stable under harsh conditions. Ganpat Industrial manufactures these washers in Mumbai. The company also exports them worldwide regularly. Flat spring wave and disc variants exist. Shipbuilding and offshore piping use these washers. Buyers worldwide trust this seawater exposed product.
Mumbai · Cupro Nickel 70/30 Washers Manufacturer India
Cu-Ni 70/30 Washers Built For Seawater, Marine Hulls And Joints Where 90/10 Grade Falls Short
Ganpat Industrial forges UNS C71500 and DIN Washers. We serve seawater, offshore and desalination projects widely.
- ✓ISO 9001:2015
- ✓ISO 14001:2015
- ✓OHSAS 18001:2007
- ✓PED Certified
- ✓Petrofac Approved
Get ASTM B151 UNS C71500 Flat Washers Supplier in India with Excellent Weldability & High Mechanical Strength
Cupro Nickel 70/30 Washers Specification
Cupro Nickel 70/30 Flat Washer Material
- UNS C71500
- DIN 2.0882
- CuNi30Mn1Fe
- ASTM B151
Cu-Ni 70/30 Spring Washer Testing
- PMI Testing
- Salt Spray Test
- Dimensional Check
- Third-Party Inspection
CuNi 70/30 Washer Origin
- Indian Origin
- European Origin
- Japanese Origin
- Traceable To Heat Number
UNS C71500 Disc Spring Washer Size Range
- ID: M3 – M36
- OD: 7 – 66 mm
- Thickness: 0.5 – 5 mm
- Custom sizes on drawing
Copper Nickel 70/30 Wave Washer Documentation
- Mill Test Certificate 3.1
- NABL Lab Report
- Packing List
- Certificate Of Origin
Cu-Ni 70/30 SAE Washer Surface Finish
- Bright Annealed
- Pickled and Passivated
- Polished
- Natural / Mill Finish
2.0882 Square Spring Washer Production Route
- Precision Blanking
- CNC Punching
- Cold Forming (Spring/Wave)
- Deburring and Tumbling
Cupro Nickel 70/30 Split Washer Governing Standard
- ASTM B151 / ASME SB151
- ASTM B171
- DIN 17664 / DIN 125
- ISO 7089 / 7090 / 7091
Cu-Ni 70/30 Washer Corrosion Resistance
- Seawater Resistant
- Chloride Resistant
- Biofouling Resistant
- Marine Grade
Copper Nickel 70/30 Wave Spring Washer Mechanical Properties
Annealed Condition – Per ASTM B151 Rod and Bar
Tensile Strength (MPa)
372-586
Load Bearing
Yield Strength (MPa) (0.5% Ext)
≥ 105
Design Limit
Elongation (50mm)
≥ 30%
Ductility
Hardness
65-85 HRB
Wear Resistance
Density
8.94 g/cm³
0.323 lb/in³
Melting Range
1170-1240°C
2140-2264°F
Max Service Temp
371°C
Annealed condition
Magnetic Property
Non-Magnetic
Single-phase alpha structure
Buy Cu-Ni 70/30 Split Washers with Multiple Thickness & Finish Options for Offshore & Naval Applications
Types Of Cupro Nickel 70/30 Washers
Cu Ni 70/30 Flat Washer
ISO 7089
CuNi 70/30 Spring Washer
DIN 127
Copper Nickel 70/30 Conical Spring Washer
DIN 6796
Cu-Ni 70/30 Disc Spring Washer
DIN 2093
UNS C71500 Wave Spring Washer
Wave Form
Cupro Nickel 70/30 Split Spring Washer
DIN 128
Cu-Ni 70/30 Square Washer
Square Coil
2.0882 Plain Washer
ASME B18.22.1
Cu-Ni 70/30 Washer Thickness Chart
Thickness varies by washer type for the same nominal size — here’s a quick cross-reference across our Flat, Spring, Wave and Disc Spring washers.
| Nominal Size | Flat Washer mm | Spring Washer mm | Wave Washer mm | Disc Spring mm | Tolerance |
|---|---|---|---|---|---|
| M3 | 0.5 | 0.8 | 0.3 | 0.4 | ±0.05 |
| M4 | 0.8 | 1.0 | 0.4 | 0.5 | ±0.05 |
| M5 | 1.0 | 1.2 | 0.5 | 0.6 | ±0.08 |
| M6 | 1.6 | 1.6 | 0.6 | 0.8 | ±0.08 |
| M8 | 1.6 | 2.0 | 0.8 | 1.0 | ±0.10 |
| M10 | 2.0 | 2.5 | 1.0 | 1.2 | ±0.10 |
| M12 | 2.5 | 3.0 | 1.2 | 1.5 | ±0.12 |
| M16 | 3.0 | 3.5 | 1.5 | 2.0 | ±0.15 |
| M20 | 3.0 | 4.0 | 1.8 | 2.5 | ±0.15 |
| M24 | 4.0 | 5.0 | 2.0 | 3.0 | ±0.20 |
Thickness above is standard stock range. Non-standard thickness manufactured on drawing / sample approval.
ASTM B151 Copper Nickel 70/30 Spring Washer Weight Chart
We share true weight figures for freight planning.
| Nominal Size | OD mm | ID mm | Thickness mm | Wt / 100 Pcs (Kg) |
|---|---|---|---|---|
| M3 | 7.0 | 3.2 | 0.5 | 0.014 |
| M4 | 9.0 | 4.3 | 0.8 | 0.035 |
| M5 | 10.0 | 5.3 | 1.0 | 0.051 |
| M6 | 12.0 | 6.4 | 1.6 | 0.116 |
| M8 | 16.0 | 8.4 | 1.6 | 0.208 |
| M10 | 20.0 | 10.5 | 2.0 | 0.407 |
| M12 | 24.0 | 13.0 | 2.5 | 0.715 |
| M14 | 28.0 | 15.0 | 2.5 | 0.981 |
| M16 | 30.0 | 17.0 | 3.0 | 1.287 |
| M20 | 37.0 | 21.0 | 3.0 | 1.955 |
| M24 | 44.0 | 25.0 | 4.0 | 3.682 |
| M30 | 56.0 | 31.0 | 4.0 | 6.109 |
| M36 | 66.0 | 37.0 | 5.0 | 10.486 |
Figures assume 8.94 g/cm³ flat washer density. Spring and wave types run 8-15% lighter each.
What Actually Moves The Price
◆Order Quantity
◆Type (Flat / Spring / Wave)
◆Finish and Testing
Request A Live Cu-Ni 70/30 Washer Quote TodayWe offer factory price on standard sizes. Repeat buyers face no minimum order penalty.
Application Of Cupro Nickel 70/30 Conical Spring Washer
We’re a well-known Cupro Nickel 70/30 Washers Manufacturer in India. Our washers perform reliably in every high-chloride application.
Ship Hull and Marine Hardware
Seawater Intake and Desalination Units
Condenser and Heat Exchanger Tube Plates
Offshore Platform Fabrication
Naval and Defence Shipbuilding
Fish Farming and Underwater Cages
Salt and Brackish Water Pump Assembly
Cladding For Chemical Storage Tanks
Need A Custom Cu-Ni 70/30 Ring Or Disc?Share your drawing for a 24-hour quote.
Cu-Ni 70/30 Disc Spring Washer Pressure Rating
Used Behind ASME B16.5 Flanged and Bolted Joints
We size washers for every pressure joint class.
| Flange Class | Max Working Pressure (Bar) | Max Working Pressure (PSI) | Typical Duty Point |
|---|---|---|---|
| Class 150 | 19.6 Bar @ 38°C | 285 PSI | Seawater lines, low pressure skids |
| Class 300 | 51.1 Bar @ 38°C | 740 PSI | Condenser and heat-exchanger headers |
| Class 600 | 102.1 Bar @ 38°C | 1480 PSI | High-pressure marine piping |
| 150 lb Navy | 19.6 Bar @ 38°C | 285 PSI | Naval and defence shipboard systems |
Ratings are non-shock ambient references per ASME B16.5. Please verify against your project’s design code.
CuNi 70/30 Split Spring Washer Schedule Chart
We source plate by standard wire gauge.
| SWG | Thickness (mm) | Thickness (Inch) | Common Washer Use |
|---|---|---|---|
| SWG 20 | 0.914 | 0.036 | Light-duty seal washer |
| SWG 18 | 1.219 | 0.048 | Flat washer, M4-M6 |
| SWG 16 | 1.626 | 0.064 | Flat washer, M6-M8 |
| SWG 14 | 2.032 | 0.080 | Flat washer, M8-M12 |
| SWG 12 | 2.642 | 0.104 | Heavy washer, M12-M16 |
| SWG 10 | 3.251 | 0.128 | Heavy washer, M16-M20 |
| SWG 8 | 4.064 | 0.160 | Structural washer, M20-M30 |
| SWG 6 | 4.877 | 0.192 | Structural washer, M30-M36 |
UNS C71500 Square Spring Washer Chemical Composition
Per ASTM B151 / UNS C71500
Nickel (Incl. Cobalt)
29.00-33.00%
Iron
0.40-1.00%
Manganese
≤ 1.00%
Zinc
≤ 1.00%
Lead
≤ 0.05%
Carbon
≤ 0.05%
Copper (Incl. Silver)
Balance (≥ 65%)
Welding-grade UNS C71520 restricts Pb and Zn limits. Please specify this welding-grade at enquiry stage.
Facing A Seawater Or Chloride-Duty Joint Challenge?Tell us the environment for our recommendation.
Cu Ni 70/30 Flat Washer Size Chart
We’re a trusted Cupro Nickel 70/30 Washers Supplier in India. We hold every size to ISO tolerance.
| Nominal Size | Inner Dia (ID) mm | Outer Dia (OD) mm | Thickness mm | Standard |
|---|---|---|---|---|
| M3 | 3.2 | 7.0 | 0.5 | ISO 7089 |
| M4 | 4.3 | 9.0 | 0.8 | ISO 7089 |
| M5 | 5.3 | 10.0 | 1.0 | ISO 7089 |
| M6 | 6.4 | 12.0 | 1.6 | ISO 7089 |
| M8 | 8.4 | 16.0 | 1.6 | ISO 7089 |
| M10 | 10.5 | 20.0 | 2.0 | ISO 7089 |
| M12 | 13.0 | 24.0 | 2.5 | ISO 7089 |
| M14 | 15.0 | 28.0 | 2.5 | DIN 125 |
| M16 | 17.0 | 30.0 | 3.0 | ISO 7089 |
| M20 | 21.0 | 37.0 | 3.0 | ISO 7089 |
| M24 | 25.0 | 44.0 | 4.0 | ISO 7089 |
| M30 | 31.0 | 56.0 | 4.0 | ISO 7089 |
| M36 | 37.0 | 66.0 | 5.0 | ISO 7089 |
Custom OD ID thickness are available on drawing. Inch series SAE and USS are stocked too.
Cu-Ni 70/30 SAE Flat Washer Material Equivalent
ASTM / ASME
- B151 / SB151
- B171 / B122
- F468 (Screws/Studs)
- B466
EN / DIN
- DIN 17664
- 2.0882
- CuNi30Mn1Fe
- EN 12449 CW354H
BS
- BS 2871 Part 2
- CN107
- BS EN 12451
JIS
- C7150T
- JIS H3300
- KS D5301
Military / Navy
- MIL-C-15726
- MIL-T-16420
- USS Grade B8 Class 2
Common Trade Name
- Cupro Nickel 70/30
- CDA 715
- AISI/CDA 715
Placing A Bulk Order For Your Shipbuilding Project?Send your BOQ for pricing and same-week dispatch.
2.0882 Spring Washer Price List and HSN Code
Buyers ask this before requesting a quote. Here is the simple tax classification breakdown.
HSN Heading
7415
Screws bolts nuts and washers of copper
Flat / Plain Washer
7415 29 00
Non-threaded: other copper washers
Spring / Coil Washer
7415 21 00
Non-threaded: washers incl. spring washers
GST Rate
18%
Standard rate on copper-nickel washers
Indicative Price Drivers Not A Fixed Rate Card
Standard Stock Sizes
- M4 – M20 ready inventory
- Ships within 2-5 working days
- Lower per-piece tooling cost
- MOQ from 5 Kg trial lots
Custom Drawing Sizes
- Any OD / ID / thickness on drawing
- 2-3 weeks lead time on new tooling
- MTC 3.1 and NABL report included
- Full container load pricing on request
Cu-Ni 70/30 Washer Test Certificates
Mill Test Certificate 3.1
Every washer gets an EN 10204 3.1 MTC. We verify ASTM B151 chemistry before dispatch.
UNS C71500 Washer Material Testing
We’re a reliable Cupro Nickel 70/30 Washers Supplier in India. We test every batch for accuracy and certification.
PMI Testing
This confirms nickel content on every lot. It uses Positive Material Identification testing.
Salt Spray Test
Seawater corrosion resistance verified per ASTM B117
Dimensional Check
OD ID and thickness are verified here. Each matches your drawing tolerance closely.
Hardness Test
Confirms annealed condition meets ASTM B151 limits
Visual and Surface Check
Screened for burrs and pitting issues. Also checked for finish defects.
Third-Party Inspection
TPI available on request for large export orders
Cupro Nickel 70/30 Washer Documentation
NABL Lab Report
Independent chemistry and mechanical test results
On Request
Packing List
Itemised piece count and weight details. Includes full carton breakup.
Every Order
Certificate Of Origin
For customs clearance and import duty processing
Export Orders
Commercial Invoice
PO-matched invoice with HSN and GST breakup
Every Order
Cu-Ni 70/30 Washer Export Packaging
Poly Bag and Carton
Standard retail-ready packing for small orders
Wooden Pallet Box
For bulk quantities
VCI Wrapped and Vacuum Pack
Anti-tarnish and moisture-sealed protection. Built for long sea transit.
Custom Labelling
PO number marked per buyer requirement
Cupro Nickel 70/30 Washers Delivered Weekly To The Following Countries
| Export to | Countries | Continent | Ports | Shipping time |
|---|---|---|---|---|
 |
Singapore | Asia | Jurong Port | 9 |
 |
Netherlands | Europe | Rotterdam | 22 |
 |
UAE | Asia | Mina Rashid | 5 days |
Monthly Delivery Of Cupro Nickel 70/30 Washers To Below Countries
| Export to | Countries | Continent | Ports | Shipping time |
|---|---|---|---|---|
 |
Norway | Europe | Bergen | 28 |
 |
Saudi Arabia | Asia | Jubail | 7 |
Frequently Asked Questions
Is a Cupro Nickel 70/30 Washer magnetic?
No it is not magnetic. This is due to its single-phase alpha structure.
Why choose ASME SB151 Cu Ni 70/30 Washers over 90/10 Grade?
Higher nickel and manganese content boosts seawater resistance. It also resists biofouling at high flow velocity.
What is the minimum order quantity for Cupro Nickel 70/30 Grade B8 Class 2 USS Washers?
Ganpat Industrial supplies trial lots to full containers. Share your size and quantity for pricing.
Discover Our Ready Inventory In These Countries
| Continent | Country |
|---|---|
| Asia | Saudi Arabia, India, Iran, South Korea, Japan, Indonesia |
| Australia | Fiji, Samoa, New Zealand, Papua New Guinea |
| Europe | Poland, Spain, France, Ukraine, Germany, Italy, UK |
| South America | Colombia, Peru, Brazil, Chile, Argentina |
| Africa | Ethiopia, Ghana, Nigeria, Kenya, South Africa, Egypt |
| North America | Cuba, Mexico, Canada, United States |
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