Sumit Impex is a trusted duplex and super duplex fasteners manufacturer in India, providing a wide range of corrosion resistant fastening solutions to meet the unique needs of critical industries. We manufacture and supply high-strength fasteners in duplex 2205 (UNS S31803/S32205) and super duplex 2507 (UNS S32750/S32760) grades, which are known for their high mechanical strength and resistance to pitting, stress, and crevice corrosion.
Our duplex and super duplex fasteners are available in types including hex bolts, heavy hex nuts, socket cap screws, washers, threaded rods, studs, U bolts, and custom-designed fasteners in both metric and imperial sizes. These fasteners follow ASTM A479, ASTM A182, ASTM A276, and ASME SA479 international standards to ensure durability and precision.
Sumit Impex is a Supplier of Duplex & Super Duplex Fasteners, Biggest Stockist of Duplex & Super Duplex Fasteners as per Standards in Mumbai, India.
Duplex Fasteners, Superduplex Fasteners, Duplex Bolts, Duplex Steel Fasteners in Best Price, Duplex Nuts, Duplex Screws, Duplex Washers, Superduplex Washers, Duplex & Super Duplex Bolts
Because of their exceptional corrosion resistance and strength, these fasteners are commonly used in highly corrosive and high-pressure environments such as offshore oil platforms, desalination plants, heat exchangers, marine equipment, subsea pipelines, and chemical processing units. The superior microstructure of duplex steel provides twice the strength of standard austenitic stainless steel while retaining excellent weldability and toughness.
Each fastener goes through quality testing, including Positive Material Identification (PMI), pitting resistance testing, IGC tests, ultrasonic tests, and radiographic inspection. Our facility is certified with ISO 9001:2015 and compliant with PED 2014/68/EU, NACE MR0175/ISO 15156, and offers EN 10204 3.1/3.2 mill test certifications. We also provide third party inspections (TPI) by agencies like TÜV, SGS and BV to meet client specific requirements.
All fasteners are made with precision CNC machining, hot forging, and cold threading techniques. We guarantee superior surface finish and mechanical accuracy, delivering fasteners that meet both standard and custom dimensional requirements. We maintain huge stock, rapid production, and reliable logistics to meet urgent project needs.
Standard Specification For Duplex & Super duplex Fasteners
| Specifications | ASTM F467 / ASME SF467 |
| Fasteners size | Bolt / Screw Size : M3 – M56 | 3/6″ to 2″ | Custom Sizes Nuts Size : M3 – M56 | 3/6″ to 2″ | Custom Sizes Washers Size : M3 – M56 | 3/6″ to 2″ | Custom Sizes Machine Screws Size : M1.6 – M12 Self Tapping Screw Size : No.2 – No. 14 |
| Fasteners Length | 3 mm to 200 mm |
| Fastener Threads | UNF, BSW, BSF, METRIC, UNC or as required |
| Standard of Stainless Steel Fasteners | DIN : DIN 934, DIN 931, DIN 970, DIN 933 UTS : UNEF, NPT, UNC, UNS, UNF, NPTF ISO : JIS standards, ISO 4033, ISO 4032, ANSI – American National Standards Institute ASME B18.5 ANSI B 28.2.4 1M as per defined in ASME B16.5 standard SS Stud Bolt length ANSI B 18.2.4 2M as per defined in ASME B18.2.2 SS Hex nuts |
| Dimensions | DIN 931, 933, 934, 7991, 976, 125, ASME B18.2.1, B18.3 |
| Surface Coating | Ptfe Coated Stainless Steel Fasteners Phosphate Coating Teflon Coating Zinc Coating Hot Dipped Galvanizing Coating Cadmium Coating Xylon Coating |
| Fasteners Finishing | Stainless steel : Self-Colour, Passivated, Bright Zinc Plated (BZP), Hot Dip Galvanised (HDG), Stainless Steel, Sherardized, some special one like DACROMET Geometry and Mechanically Applied coating ,Dacroment, nickel plated, anodizing, plated zinc-nickel Zinc (blue, black, yellow, white), black oxide. |
Duplex & Super Duplex Fasteners Types
Stud Bolts
Stud Bolts
Bolts
Bolts
Nuts
Nuts
Washers
Washers
Contact Us For Quatation & Questions Related To Duplex & Super Duplex Fasteners
Duplex & Super Duplex Fasteners Applications
Food Processing Industry
Hydraulic Applications
Offshore Pipelines & Pipe Works
Oil & Gas Industrires
Petrochemical Industry
Piping Systems
Power Plant Industry
Pulp & Paper Industry
Refining Industry
shipbuilding-industries
Chemical Industries
Construction Industries
Export & Supply Destinations Of Duplex & Super Duplex Fasteners
Mongolia, United Arab Emirates, Bangladesh, China, Nepal, Singapore, Qatar, Japan, Bahrain, Malaysia, Russia, Kyrgyzstan, Iran, Turkey, Philippines, Vietnam, Thailand, Macau, Armenia, Bhutan, Israel, Iraq, Azerbaijan, Taiwan, Saudi Arabia, Kuwait, Maldives, Afghanistan, Lebanon, British, Egypt, India, South Korea, North Korea, Myanmar, Sri Lanka, Indonesia, Hong Kong, Oman, Jordan.
Germany, Switzerland, Czechia/Czech Republic, Malta, Austria, Cyprus, Liechtenstein, Denmark, Belgium, Croatia, Poland, Estonia, Russia, Spain, Luxembourg, Bulgaria, Ukraine, Sweden, Turkey, Finland, Greece, France, Monaco, Latvia, Serbia, Norway, United Kingdom, Romania, Slovakia, Italy, Azerbaijan, Belarus, Netherlands, Hungary, Lithuania, Moldova, Ireland, Portugal.
Madagascar, Zambia, Tunisia, Cameroon, Central African Republic, Nigeria, Egypt, Seychelles, Algeria, Zimbabwe, Burkina Faso, Mozambique, Niger, Burundi, Mauritius, Tanzania, Uganda, Rwanda, Libya, Kenya, Morocco, Namibia, Angola, Liberia, South Africa, Senegal, Eswatini, Gambia, Ethiopia, Mauritania, Botswana.
Trinidad and Tobago, United States of America, Panama, Saint Vincent and the Grenadines, Honduras, Dominica, Barbados, Bahamas, Costa Rica, Guatemala, Antigua and Barbuda, Grenada, Saint Lucia, El Salvador, Jamaica, Dominican Republic, Cuba, Mexico, Belize, Canada, Nicaragua, Haiti.
Brazil, Guyana, Venezuela, Paraguay, Suriname, Peru, Uruguay, Colombia, Bolivia, Argentina, Chile, Ecuador.
