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Punit Fasteners is a trustworthy manufacturer and supplier of Copper Nickel 90/10 Nuts based in Delhi, India. Intended for environments where seawater, chemical exposure, and corrosion are challenges, our nuts are crafted from high-quality Cu-Ni 90/10 alloy. We offer various standard and custom sizes that meet international specifications, including ASTM B151. These nuts are precision-machined for a perfect fit and strong fastening in marine and industrial systems. Punit Fasteners is committed to providing corrosion-resistant, high-performance fasteners with reliable quality for offshore, heat exchanger, and chemical processing equipment applications.
Copper Nickel 90/10 Nuts consist of 90% copper and 10% nickel along with trace elements like iron and manganese. This alloy provides good tensile strength (around 350 to 450 MPa), excellent corrosion resistance in seawater, and resistance to biofouling and scaling. These nuts remain mechanically strong in high-humidity and chloride-rich environments. Their Brinell hardness typically falls between 70 and 90, and they possess good thermal and electrical conductivity. Cu-Ni 90/10 nuts are non-magnetic, thermally stable, and suitable for continuous exposure to saltwater, making them ideal for marine and industrial applications.
| Grade | Cu | Mn | Pb | Ni | Fe | Zn |
| Cupro Nickel 90/10 | 88.6 min | 1.0 max | 0.05 max | 9-11 max | 1.8 max | 1 max |
| Element | Density | Melting Point | Tensile Strength | Yield Strength (0.2%Offset) | Elongation |
| Cupro Nickel 90/10 | 0.323 lb/in3 at 68 F | 2260 F | 50000 psi | 20000 psi | 30 % |
| Specifications | ASTM B151 / ASME SB151 |
| Standard | DIN, ISO ,JIS ,GB, IS, BS, ASTM and all International Standards |
| Size | M3 – M100 | 3/6″ – 4″ | Custom Sizes |
| Length | 3 mm – 200 mm | Custom Sizes |
| Dimensions | DIN 931, 933, 934, 7991, 976, 125, ASME B18.2.1, B18.3 |
| Threads available | UNF, BSW, BSF, METRIC, UNC, or as required |
| Threads Configuration | ASME B1.1 2A/3A – 2B/3B Inch Unified Threads and B1.13M 6h-6G Metric Coarse Threads |
| Form | Hex, Threading, Square, Round as per Gauge Etc. |
| Head | Hex, Square, Round, Hex flange, Flat, T-head & Triangular etc. |
| Neck type | Hex, Square, Triangular, Oval & Knurled etc. |
| Surface Treatment | Passivation /plain |
| Others Factor | OEM, ODM, ±0.03MM tolerance |
| Manufacturing Process | Wire Drawing, Cold Heading, Insert tapping, Heat Treatment, Surface Plating, Inspection, Packing. |
| Packing | IN BULK: carton, pallet, Small Boxes or customer request |
| Surface Coating | Black Oxide, Cadmium, Galvanized, Teflon, Xylan, Zinc, Others Upon Request |
| Test Certificate | As per EN 10204 / 3.1 Manufacturer Test Certificate, PED 97/23/EC Certified, Merk blatt AD 2000 W2 Certified |
| Certification | Dual Certified As per ASTM & ASME Codes |
To satisfy our clients needs by providing high quality products at competitive price as per the schedule and to maintain long term relationship with our clients.
Our Copper Nickel 90/10 Nuts at Punit Fasteners are properly packed so that they do not reach the client in a damaged state. Every nut is covered and packed separately in strong and moisture-proof packets to avoid the spoilage and deterioration. Proper labeling helps in quick identification and management of the items. Our packing process ensures that the nuts do not lose their quality and are ready for use, which is a clear depiction of our quality products and excellent customer relations.
Punit Fasteners is a leading manufacturer and supplier of high-quality fasteners in Delhi, India, with over 15 years of experience serving global industries.
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