Unifit Fastener is a trusted manufacturer and supplier of duplex steel UNS S31803 and UNS S32205 hex nuts that contain quality fastening products that are designed to perform at their best. The nuts are made of duplex stainless steel that is a mixture of both ferritic and austenitic phases, hence high strength, toughness, and excellent corrosion resistance. Such a special metallurgical design will make the duplex S31803 hex nuts a good alternative in harsh operating conditions where durability and stability over time are a necessity.
Duplex Steel S31803 Hex Nuts, UNS S31803 Hex Nuts, DSS S31803 Hex Nuts, Duplex Steel S32205 Hex Nuts, UNS S32205 Hex Nuts, Duplex 2205 Hex Nuts, 1.4462 Hex Nuts, Duplex Stainless Steel Heavy Hex Nuts, Duplex Steel Hex Flange Nuts, Duplex Steel Hex Jam Nuts, Duplex Steel Hex Coupling Nuts, Duplex Steel Machine Hex Nuts, Duplex Steel Lock Nuts, ASTM A479 Duplex Steel Nuts, ASME B18.2.2 Heavy Hex Nuts, ASTM / ASME F60 Hex Nuts.
Request QuoteTable of Contents
- Duplex steel UNS S31803 Hex Nuts
- Duplex Steel UNS S32205 Hex Nuts
- Duplex Steel S31803/S32205 Nuts Specification
- Send Your Enquiry
- Duplex Steel S31803/S32205 Nuts Equivalent Grade
- Types of Duplex Steel UNS S31803/ UNS S32205 Nuts
- Duplex Stainless Steel Hex Nuts Chemical Composition
- Ferritic Duplex Steel Hex Nuts Mechanical Properties
- Grade S31803 / S32205 Duplex Stainless Steel Nuts Standards
- Duplex Steel UNS S31803/S32205 Nuts Sizes
- Duplex S31803/S32205 Nut Weight Chart
- Duplex Steel Fasteners Price list
- Other Types Of UNS S31803/S32205 Duplex Nuts in Stock
- Duplex Steel S31803/S32205 Nuts Application
- FAQ’s About Duplex Steel UNS S31803 & UNS S32205 Hex Nuts
Duplex steel UNS S31803 Hex Nuts
Our UNS S31803 duplex steel hex nuts in industries are capable of enduring harsh environments like the sea, high pressure and environments with a high concentration of chlorides. They are also commonly used in marine engineering, oil and gas equipment, offshore, chemical processing, food and beverage plants, mining operations, and heavy-duty construction applications. They are resistant to stress corrosion cracking and pitting as well as abrasion, which guarantees reliable performance even under acidic or saline conditions.
Duplex Steel UNS S32205 Hex Nuts
Unifit Fastener also distributes duplex steel UNS S32205 hex nuts along with S31803 available in duplex steel with high levels of mechanical strength, high levels of wear resistance, and also high levels of toughness even at low temperatures. The grade provides a dependable performance in the conditions that require the use of hydrochloric or sulfuric acid, high temperatures up to 300°C, and constant exposure to salt water or industrial chemicals. The above characteristics position UNS S32205 nuts as the best choice in the industries that require extended service life and high corrosion resistance under harsh conditions in the sea, offshore drilling, refineries and chemical processing equipment.
Unifit Fastener guarantees the precision engineered fastening products that are built to attain international standards and provide standardized performance in the complex industrial applications.
Duplex Steel S31803/S32205 Nuts Specification
| Parameter | Details |
|---|---|
| Specifications | ASTM A194 / ASME SA194, ASTM F594, DIN, ASTM, BS and all International Standards |
| Length | 3mm to 200mm |
| Size | 3/6″ to 2″, M3 – M56, Custom Sizes |
| Duplex Nuts Property Class | A2-70, A2-80, A4-70, A4-80, F594C, F594D, F594G, F594H, A2-035, A4-040 |
Send Your Enquiry
Duplex Steel S31803/S32205 Nuts Equivalent Grade
Duplex Steel UNS S31803 & UNS S32205 Nuts correspond to the widely used Duplex 2205 grade, identified by Werkstoff Nr. 1.4462. This equivalent grade ensures excellent strength, superior corrosion resistance, and reliable performance across demanding industrial applications.
| STANDARD | WERKSTOFF NR. | UNS |
|---|---|---|
| Duplex 2205 | 1.4462 | S31803 / S32205 |
Types of Duplex Steel UNS S31803/ UNS S32205 Nuts
Duplex Steel S31803 Hex Jam Nut
Duplex Steel S31803 Heavy Hex Nut
Duplex Steel S31803 Hex Flange Nut
Duplex Steel S31803 Slotted Hex Nut
Duplex Steel S31803 Machine Hex Nut
Duplex Steel S31803 Long Hex Nut
Duplex Stainless Steel Hex Nuts Chemical Composition
Duplex Steel UNS S31803 and UNS S32205 Hex Nuts are engineered with a balanced mix of chromium, nickel, molybdenum, and nitrogen, offering superior corrosion resistance and high mechanical strength.
| Grade | C | Mn | Si | P | S | Cr | Mo | Ni | N | Fe |
|---|---|---|---|---|---|---|---|---|---|---|
| S31803 | 0.030 max | 2.00 max | 1.00 max | 0.030 max | 0.020 max | 22.0 – 23.0 | 3.0 – 3.5 | 4.50 – 6.50 | 0.14 – 0.20 | 63.72 min |
| S32205 | 0.030 max | 2.00 max | 1.00 max | 0.030 max | 0.020 max | 21.0 – 23.0 | 2.50 - 3.50 | 4.50 – 6.50 | 0.8 – 0.20 | 63.54 min |
Ferritic Duplex Steel Hex Nuts Mechanical Properties
Duplex Steel UNS S31803 and UNS S32205 Hex Nuts deliver excellent mechanical strength with a minimum tensile strength of 90 ksi, high yield strength, and reliable elongation for consistent performance.
| Tensile Strength, ksi | 0.2% Yield Strength, ksi | Elongation, % | Hardness [HRC] |
|---|---|---|---|
| 90 min | 65 min | 25 min | 293 max |
Grade S31803 / S32205 Duplex Stainless Steel Nuts Standards
Grade UNS S31803 & UNS S32205 Duplex Stainless Steel Nuts are manufactured in accordance with major global standards such as DIN, ISO, BS, and ANSI, ensuring precision, consistency, and compatibility across diverse industrial applications.
| DIN Nuts | Hexagon Nuts |
|---|---|
| Din 315 Nuts | DIN 934 |
| Din 431 Nuts | BS 1768 |
| Din 555 Nuts | BS 1769 |
| Din 557 Nuts | BS 1083 |
| Din 562 Nuts | BS 3692 |
| Din 582 Nuts | ISO 4032 |
| Din 934 Nuts | ISO 4033 |
| Din 936 Nuts | ANSI B18.2.2 |
| Din 1587 Nuts | |
| Din 6923 Nuts |
Duplex Steel UNS S31803/S32205 Nuts Sizes
Duplex Steel UNS S31803 & UNS S32205 Nuts are available in multiple metric sizes and configurations, including Hex Nuts, Jam Nuts, and Nylock Nuts. Each size is precision-designed to ensure secure and reliable fastening in industrial applications.
| Nut Size (mm) |
Diameter* (mm) |
Height (mm) |
||
|---|---|---|---|---|
| Hex Nut | Jam Nut | Nylock Nut | ||
| 2 | 4 | 1.6 | 1.2 | |
| 2.5 | 5 | 2 | 1.6 | |
| 3 | 5.5 | 2.4 | 1.8 | 4 |
| 4 | 7 | 3.2 | 2.2 | 5 |
| 5 | 8 | 4 | 2.7 | 5 |
| 6 | 10 | 5 | 3.2 | 6 |
| 7 | 11 | 5.5 | 3.5 | |
| 8 | 13 | 6.5 | 4 | 8 |
| 10 | 17 | 8 | 5 | 10 |
| 12 | 19 | 10 | 6 | 12 |
| 14 | 22 | 11 | 7 | 14 |
| 16 | 24 | 13 | 8 | 16 |
| 18 | 27 | 15 | 9 | 18.5 |
| 20 | 30 | 16 | 10 | 20 |
| * This is the diameter across the flats. It is also the size of wrench to use. | ||||
Duplex S31803/S32205 Nut Weight Chart
The Duplex UNS S31803 & UNS S32205 Nut Weight Chart provides accurate weight details for Finished Hex, Heavy Hex, Jam, and Square Nuts across various sizes, helping users select the right fastener for precise load and assembly requirements.
| Size | Finished Hex | Heavy Hex | Finished Jam | Heavy Hex Jam | Square | Heavy Square |
|---|---|---|---|---|---|---|
| 1/2" Nut | 3.75 | 6.54 | 2.62 | 4.00 | 5.78 | 7.87 |
| 5/8" Nut | 7.33 | 11.9 | 4.93 | 6.96 | 10.8 | 14.3 |
| 3/4" Nut | 11.9 | 19.3 | 7.70 | 11.0 | 15.4 | 23.5 |
| 7/8" Nut | 19.0 | 29.7 | 12.0 | 16.7 | 24.5 | 36.2 |
| 1" Nut | 28.3 | 42.5 | 17.6 | 23.5 | 36.3 | 51.5 |
| 11/8" Nut | 40.3 | 59.2 | 24.7 | 32.4 | 52.5 | 72.4 |
| 11/4" Nut | 54.3 | 78.6 | 36.1 | 45.8 | 70.6 | 95.5 |
| 13/8" Nut | 73.0 | 102 | 47.9 | 59.3 | 94.5 | 125.0 |
| 11/2" Nut | 94.3 | 131 | 60.9 | 74.8 | 122 | 161 |
| 15/8" Nut | 162 | 91.6 | ||||
| 13/4" Nut | 151 | 204 | 100 | 114 | ||
| 17/8" Nut | 241 | 134 | ||||
| 2" Nut | 224 | 299 | 140 | 165 | ||
| 21/4" Nut | 419 | 227 | ||||
| 21/2" Nut | 564 | 332 | ||||
| 23/4" Nut | 738 | 429 | ||||
| 3" Nut | 950 | 545 | ||||
| 31/4" Nut | 1194 | 651 | ||||
| 31/2" Nut | 1526 | 851 | ||||
| 33/4" Nut | 1812 | 1005 | ||||
| 4" Nut | 2180 | 1200 |
Duplex Steel Fasteners Price list
We offer wide range of industrial Duplex Steel S31803, S32205 Nuts that in compliance with IS, BS and DIN standards at best market prices in India. To know more about the latest price of Duplex Steel UNS S31803/S32205 Nuts Please Call 91 22 66518521 or Send an Email to chirag@unifitmetalloys.com
| Product | Price (US $ per Piece) | Estimated India Price (₹ per Piece) |
|---|---|---|
| 2205 Duplex Steel Hexagon Bolt | US $0.01–1.5 | ₹120 – ₹900 per pc (approx range seen locally) |
| S31803 / Duplex 2205 Heavy Hex Nuts M8 | US $0.001–0.009 | ₹30 – ₹80 per pc (typical grade nut pricing) |
| Duplex Steel 2205 Hex Socket Cap Screw | US $0.1–2 | ₹150 – ₹1,200 per pc (varies by size) |
| 2205 Duplex Steel Spring Washer | US $0.02–0.6 | ₹20 – ₹100 per pc (approx) |
| Duplex Steel 2205 Full Threaded Stud Bolt | US $1–2000 | ₹300 – ₹3,500 per pc (depends on size & length) |
Other Types Of UNS S31803/S32205 Duplex Nuts in Stock
| Duplex UNS S31803 F51 Nuts | Duplex Steel S32205 Bolts |
| ANSI B18.2 Duplex Steel S31803 Hex Nuts | Duplex UNS S31803 Flange Lock Nut |
| Duplex Steel UNS S31803 Hex Head Nuts | Duplex Steel S32205 Coupling Nut |
| ASTM F594 Duplex Steel S32205 Hex Coupling Nut | Duplex Steel UNS S31803 Dome Nuts |
| Duplex Alloy DIN. 1.4462 Heavy Hex Nuts | Duplex Steel SAF 2205 Nylock Nuts |
| Duplex Steel S31803 Weld Nut Supplier | Suppliers of Duplex Steel S32205 Square Nut |
| INOX 1.4462 Hex Nuts Exporter | Duplex Steel S32205 Hexagon Thin Nuts |
| Duplex Steel S31803 Wing Nuts | Duplex Alloy UNS S32205 Acorn Nuts |
| ANSI B18.2 Duplex Steel S32205 Coupler Nuts | Duplex Steel S31803 Castle Nuts |
| ASTM A479 Duplex Steel S31803 Hexagon Nuts With Flange | Duplex Alloy 2205 Coupling Nuts |
| ASTM A479 Duplex Steel S32205 Rivet Nuts | Duplex Steel S31803 Dome Cap Nuts |
| Duplex Steel S31803/S32205 Self Locking Nut | ASTM A479 Duplex Steel S31803/S32205 Lock Nuts |
| Duplex 2205 2 Way Lock Nut Supplier | UNS S31803 Duplex Serrated Flange Nut |
| ASTM F59 Duplex Steel S31803/S32205 Coupling Nut | Duplex Steel S31803/S32205 Wing Nuts |
| Duplex UNS S31803 Structural Nuts | Duplex Alloy 2205 Panel Nut Supplier |
| Duplex Steel S31803 Nylon Insert Nut | Duplex Steel S32205 Spring T Nuts Stockists |
| ASTM F594 Duplex Steel S32205 Hex Coupling Nut | INOX 1.4462 Duplex Steel Hex Domed Cap Nuts Exporter |
| A479 Grade Duplex Steel S31803/S32205 Slotted Nut | ASTM F593 Duplex Steel S32205 Flex Lock Nut |
Duplex Steel S31803/S32205 Nuts Application
Our products range of Duplex Steel S31803, S32205 Nuts find application in various areas such as: Railways, Vessels, Civil Industries, Petro-Chemical Industries, Home Fittings, Heavy Engineering Industries, Pumps, Valves, Off Shore & On Shore Oil Towers, power Generation Units ( Nuclear, Civil Construction Industries, Hydro or Thermal), Steel Plants, Oil Expansion Projects, Fertilizer Plants, Ship Building Industries etc.
FAQ’s About Duplex Steel UNS S31803 & UNS S32205 Hex Nuts
What is UNS S31803 material?
UNS S31803 is a duplex stainless steel grade that contains a balanced mix of austenitic and ferritic phases. It offers high strength, excellent resistance to pitting and crevice corrosion, and is widely used in marine, chemical, and oil & gas applications.
Is S31803 the same as 2205?
Yes, S31803 is commonly associated with Duplex 2205, but not exactly identical. 2205 typically refers to a more optimized version of S31803, often produced with slightly higher nitrogen content. This improved variant is designated as UNS S32205, offering better corrosion resistance.
What is UNS S32205 material grade?
UNS S32205 is an enhanced duplex stainless steel grade known for its high strength, excellent toughness, and superior pitting and chloride resistance. It is widely used in offshore platforms, chemical processing, desalination plants, and other corrosive environments where long-term durability is required.
Where are Duplex Steel S31803/S32205 Nuts commonly used?
These nuts are widely used in marine engineering, offshore platforms, oil & gas equipment, chemical processing plants, desalination units, pulp & paper industries, mining operations, and structural applications.