Super Duplex Steel Washers Manufacturer & Supplier
Unifit Fastener is a trusted manufacturer, supplier, and exporter of high-performance Super Duplex Steel Washers, which are designed to operate under high pressure in industrial settings. We have our washers that are commonly used in offshore platforms, oil and gas systems, chemical processing plants, and marine (they are very strong and resistant to corrosion). We make sure that all products are made to live up to the international quality standards in order to present a flawless and reliable performance.
We can provide Super Duplex Steel Washers in high-quality grades, which include S32205, UNS S32750 and UNS S32760, each having high resistance against pitting, crevice corrosion as well as stress corrosion cracking. These grades are characterised by a microstructure that is austenitic and ferritic in composition with large amounts of chromium, molybdenum and nitrogen, which produce a high level of mechanical strength and long life service even in harsh conditions.
We produce washers in a large variety of sizes, thicknesses and custom requirements at Unifit Fastener to meet the different project requirements. Our high-level production plant is installed with the latest machinery that guarantees proper dimensions, smooth finishes and quality uniformity. All the processes are firmly controlled by highly qualified specialists who use only certified raw materials.
All Super Duplex Steel Washers are thoroughly checked in terms of quality, such as dimensional, chemical and mechanical testing, before shipment. Packages that are safe and delivered in time also guarantee that the customers get defect-free products. Unifit Fastener believes in quality and has been providing high-quality and economical fastening products all over the world.
Request QuoteTable of Contents
- What Are Super Duplex Washers?
- Types of Super Duplex Washers
- Specification of Super Duplex Washers
- Send Your Enquiry
- Equivalent Grade of Super Duplex Steel Washer
- Mechanical Properties of Super Duplex Steel Washer
- Chemical Composition of Super Duplex Steel Washer
- Dimensional Standards
- Super Duplex Steel Washer – USS & SAE Dimension Chart
- Applications of Super Duplex Steel Washers
- People Ask About Nuts Manufacturer
What Are Super Duplex Washers?
Super Duplex Washers are high-performance fasteners manufactured out of super duplex stainless steel (such as S32750 and S32760) which have high performance and superior corrosion resistance, particularly with regard to chloride stress corrosion cracking, and are thus suited to harsh marine, oil and gas, and chemical processing environments where the other stainless steels cannot perform. They are an amalgamation of austenitic and ferritic steels with high tensile strength, excellent weldability, and pitting- and crevice-resistant corrosion characteristics that are vital in demanding industrial applications.
Super Duplex steel flat washer, ASTM A479 Super Duplex steel ogee washers, Super Duplex S32750 star washer, Super Duplex steel spring washer, UNS S32760 fender washer manufacturer in India, Super Duplex steel square washer, ASME SA 479 Super Duplex steel tooth washer, Super Duplex steel plain washers, 2507 Super Duplex steel split washer, Super Duplex steel dock washer, Super Duplex taper washer.
Types of Super Duplex Washers
Super Duplex Steel Lock Washer
Super Duplex Steel Flat Washer
Super Duplex Steel Dome Washer
Super Duplex Steel Square Washer
Super Duplex Steel Spring Washer
Super Duplex Steel Ogee Washer
Specification of Super Duplex Washers
| Parameter | Details |
|---|---|
| Trade Name | Super Duplex S32750 / S32760 / 2507 Washer |
| Material Standard | ASTM A479 / ASME SA479 |
| Dimensions | ASTM, DIN, BS, GB, IS & all International Standards |
| Size Range | M3 – M56 | 3/6″ to 2″ | Custom Sizes |
| Length / Thickness Range | 3 mm to 200 mm |
| Marking | Grade, Standard, Thickness, Heat No. (or as per customer requirement) |
| Delivery Time | 7–15 working days (depends on order quantity) |
| Payment Terms | PayPal, Western Union, T/T, L/C, Trade Assurance (30% advance, balance before dispatch) |
| Free Sample | Available (subject to stock) |
| Testing & Certification | EN 10204 3.1B, NACE 3.1, Mill Test Certificate, ISO 17025 (Govt. of India Lab), Raw Material Certificate, 100% Radiography, Third Party Inspection, PMI |
| Raw Material Origin & Mills | Japan, India, USA, Korea, Europe, Russia, Ukraine (No China) |
| Applications & Industries | Petroleum, Chemical Plants, Power Sector, Gas Industry, Hardware Tools, Metallurgy, Machinery, Construction, Shipbuilding |
Send Your Enquiry
Equivalent Grade of Super Duplex Steel Washer
| Standard | Werkstoff Nr. | UNS |
|---|---|---|
| Super Duplex 2507 | 1.4410 | UNS S32750 |
| Super Duplex 2507 (Enhanced) | 1.4501 | UNS S32760 |
Mechanical Properties of Super Duplex Steel Washer
| Property | Value |
|---|---|
| Tensile Strength (MPa) min | 760 |
| Yield Strength 0.2% Proof (MPa) min | 550 |
| Elongation (% in 50mm) | 15 |
| Hardness Rockwell C (HR C) | 32 Max |
Chemical Composition of Super Duplex Steel Washer
| Element | Composition |
|---|---|
| Phosphorus (P) | 0.035 % max |
| Sulphur (S) | 0.02 % max |
| Silicon (Si) | 0.80 % max |
| Carbon (C) | 0.03 % max |
| Manganese (Mn) | 1.20 % max |
| Nickel (Ni) | 6.00 – 8.00 % |
| Molybdenum (Mo) | 3.00 – 5.00 % |
| Nitrogen (N) | 0.24 – 0.32 % |
| Copper (Cu) | 0.50 % max |
| Chromium (Cr) | 24.0 – 26.0 % |
Dimensional Standards
- American Standard (ANSI/ASME/AWWA)
- German Standard (DIN)
- European Standard (EN)
- Japanese Standard (JIS)
- British Standard (BS)
- MSS Standard (MSS-SP)
- Petroleum Standard (API)
- Russian Standard (GOST)
- South African Standard (SABS / SANS)
Super Duplex Steel Washer – USS & SAE Dimension Chart
| Size | USS ID (A) | USS OD (B) | USS Thick (C) | SAE ID (A) | SAE OD (B) | SAE Thick (C) |
|---|---|---|---|---|---|---|
| #2 | – | – | – | 3/32″ | 1/4″ | 0.020″ |
| #4 | – | – | – | 1/8″ | 5/16″ | 0.032″ |
| #6 | – | – | – | 5/32″ | 3/8″ | 0.049″ |
| #8 | – | – | – | 3/16″ | 7/16″ | 0.049″ |
| #10 | – | – | – | 7/32″ | 1/2″ | 0.049″ |
| #12 | – | – | – | 1/4″ | 9/16″ | 0.065″ |
| 1/4″ | 5/16″ | 0.734″ | 0.065″ | 9/32″ | 5/8″ | 0.065″ |
| 3/8″ | 7/16″ | 1″ | 0.083″ | 13/32″ | 13/16″ | 0.065″ |
| 1/2″ | 9/16″ | 1-3/8″ | 0.109″ | 17/32″ | 1-1/16″ | 0.095″ |
| 3/4″ | 13/16″ | 2″ | 0.148″ | 13/16″ | 1-15/32″ | 0.134″ |
| 1″ | 1-1/16″ | 2-1/2″ | 0.165″ | 1-1/16″ | 2″ | 0.134″ |
| 1-1/4″ | 1-3/8″ | 3″ | 0.165″ | – | – | – |
| 1-1/2″ | 1-5/8″ | 3-1/2″ | 0.180″ | – | – | – |
| 2″ | 2-1/8″ | 4-1/2″ | 0.213″ | – | – | – |
Super Duplex Steel Washer – USS & SAE Dimension Chart
| Size | USS ID (A) | USS OD (B) | USS Thick (C) | SAE ID (A) | SAE OD (B) | SAE Thick (C) |
|---|---|---|---|---|---|---|
| #2 | – | – | – | 3/32″ | 1/4″ | 0.020″ |
| #4 | – | – | – | 1/8″ | 5/16″ | 0.032″ |
| #6 | – | – | – | 5/32″ | 3/8″ | 0.049″ |
| #8 | – | – | – | 3/16″ | 7/16″ | 0.049″ |
| #10 | – | – | – | 7/32″ | 1/2″ | 0.049″ |
| #12 | – | – | – | 1/4″ | 9/16″ | 0.065″ |
| 1/4″ | 5/16″ | 0.734″ | 0.065″ | 9/32″ | 5/8″ | 0.065″ |
| 3/8″ | 7/16″ | 1″ | 0.083″ | 13/32″ | 13/16″ | 0.065″ |
| 1/2″ | 9/16″ | 1-3/8″ | 0.109″ | 17/32″ | 1-1/16″ | 0.095″ |
| 3/4″ | 13/16″ | 2″ | 0.148″ | 13/16″ | 1-15/32″ | 0.134″ |
| 1″ | 1-1/16″ | 2-1/2″ | 0.165″ | 1-1/16″ | 2″ | 0.134″ |
| 1-1/4″ | 1-3/8″ | 3″ | 0.165″ | – | – | – |
| 1-1/2″ | 1-5/8″ | 3-1/2″ | 0.180″ | – | – | – |
| 2″ | 2-1/8″ | 4-1/2″ | 0.213″ | – | – | – |
Super Duplex Steel Spring Washer Dimensions
| Nom Size (mm) | Inner Dia (mm) | Outer Dia (mm) | Width (mm) | Thickness (mm) | Weight /1000 (kg) |
|---|---|---|---|---|---|
| 3 | 3.1 | 6.2 | 1.3 | 0.8 | 0.11 |
| 6 | 6.1 | 11.8 | 2.5 | 1.6 | 0.83 |
| 10 | 10.2 | 18.1 | 3.5 | 2.2 | 2.53 |
| 16 | 16.2 | 27.4 | 5.0 | 3.5 | 8.91 |
| 24 | 24.5 | 40.0 | 7.0 | 5.0 | 26.20 |
| 30 | 30.5 | 48.2 | 8.0 | 6.0 | 44.30 |
| 36 | 36.5 | 58.2 | 10.0 | 6.0 | 67.30 |
| 48 | 49.0 | 75.0 | 12.0 | 7.0 | 123.00 |
| 52 | 53.0 | 83.0 | 14.0 | 8.0 | 320.00 |
Super Duplex Steel Flat Washer – USS & SAE
| Bolt Size | USS OD | USS ID | USS Thick | SAE OD | SAE ID | SAE Thick |
|---|---|---|---|---|---|---|
| 1/4 | 0.734 | 0.312 | 0.051–0.080 | 0.625 | 0.281 | 0.051–0.080 |
| 3/8 | 1.000 | 0.438 | 0.064–0.104 | 0.812 | 0.406 | 0.051–0.080 |
| 1/2 | 1.375 | 0.562 | 0.086–0.132 | 1.062 | 0.531 | 0.074–0.121 |
| 3/4 | 2.000 | 0.812 | 0.122–0.177 | 1.469 | 0.812 | 0.108–0.160 |
| 1″ | 2.500 | 1.062 | 0.136–0.192 | 2.000 | 1.062 | 0.108–0.160 |
| 1-1/2″ | 3.500 | 1.625 | 0.153–0.213 | 3.000 | 1.625 | 0.153–0.213 |
International Standards for Super Duplex Steel Washers
| Standard | Description |
|---|---|
| ASTM F436 | Heavy & Clipped Washers |
| ASTM F436M | Metric Clipped Washers |
| ANSI B18.22.1A | Type A Plain Washers |
| ANSI B18.22.1B | Type B Plain Washers |
| DIN 125 | Type A & Type B Washers |
| AS 1237 | Plain Washers |
Super Duplex Steel Washers – Weight Chart (Per 100 Nos)
| Metric Size | Plain Washer (IS:2016) | Heavy Washer (IS:6610) | Machined Washer (IS:2016) | Square / Taper Washer | Spring Washer – Flat | Spring Washer – Square |
|---|---|---|---|---|---|---|
| M3 | – | – | – | – | 0.01 | 0.01 |
| M4 | – | – | – | – | 0.02 | 0.02 |
| M5 | 0.04 | – | 0.04 | – | 0.03 | 0.03 |
| M6 | 0.11 | – | 0.11 | – | 0.08 | 0.04 |
| M8 | 0.20 | – | 0.21 | 1.10 | 0.16 | 0.11 |
| M10 | 0.39 | 1.60 | 0.40 | 1.00 | 0.25 | 0.20 |
| M12 | 0.58 | 1.90 | 0.62 | 2.00 | 0.38 | 0.23 |
| M14 | 0.82 | – | – | – | 0.60 | 0.38 |
| M16 | 1.06 | 2.90 | 1.13 | 3.40 | 0.89 | 0.59 |
| M18 | 1.27 | – | – | – | 0.97 | 0.66 |
| M20 | 1.64 | 4.40 | 1.72 | 5.80 | 1.52 | 1.23 |
| M22 | 1.75 | – | – | 7.50 | 1.65 | 1.36 |
| M24 | 3.11 | 6.30 | 3.30 | 13.50 | 2.62 | 1.81 |
| M27 | 3.94 | 8.00 | 4.23 | 12.50 | 2.87 | 2.06 |
| M30 | 5.05 | 10.10 | 5.36 | 16.50 | 4.43 | 3.20 |
| M33 | 7.10 | 12.00 | 7.54 | 21.00 | 6.30 | 3.50 |
| M36 | 8.73 | 14.60 | 9.20 | 25.50 | 6.73 | 5.25 |
| M39 | 12.60 | 16.70 | 13.30 | 28.30 | 7.17 | 5.61 |
| M42 | 17.50 | 20.10 | 18.30 | – | 11.10 | 8.00 |
| M45 | 21.20 | 22.20 | 22.00 | – | 11.70 | 8.53 |
| M48 | 28.40 | 26.00 | 29.40 | – | 12.30 | 9.00 |
| M52 | 31.90 | – | 33.00 | – | 18.20 | – |
| M56 | 47.90 | – | – | – | 19.30 | – |
| M60 | 51.60 | – | – | – | 20.30 | – |
| M64 | 55.40 | – | – | – | 21.80 | – |
| M72 | 63.40 | – | – | – | 24.00 | – |
Widest Stock of Super Duplex Steel Washers
| Super Duplex Steel Bevel Washers | Super Duplex Dock Washer Stock |
| Super Duplex Steel Tooth Washer | Super Duplex Steel Machine Washer |
| ASME SA479 Super Duplex Spring Washer | Super Duplex Steel Flat Washer |
| Super Duplex Steel Split Ring Washers | Super Duplex Steel Fender Washer |
| Super Duplex Steel Taper Washer Manufacturer | Super Duplex Steel Cup Washer |
| Super Duplex Steel Industrial Washers | Super Duplex 2507 Split Washer |
| Super Duplex Steel Tab Washer Supplier | Super Duplex Steel Sealing Washer |
| ASTM A479 Super Duplex Plain Washer | Super Duplex Steel Split Lock Washers |
Applications of Super Duplex Steel Washers
- Oil & Gas Industry
- Marine & Shipbuilding
- Chemical & Petrochemical Plants
- Power Generation
- Desalination & Water Treatment
- Heavy Engineering & Fabrication
- Construction & Infrastructure
- Mining & Metallurgy
- Aerospace & Defense
- Automotive & Industrial Equipment
People Ask About Nuts Manufacturer
What is Super Duplex used for?
Super Duplex stainless steel is used in applications that require very high strength and exceptional corrosion resistance. It is commonly applied in oil and gas pipelines, offshore platforms, desalination plants, chemical processing units, marine equipment, pressure vessels, and heat exchangers. Its excellent resistance to chloride stress corrosion cracking, pitting, and crevice corrosion makes it ideal for harsh and aggressive environments.
What is the difference between Super Duplex and Duplex?
The main difference lies in strength and corrosion resistance. Super Duplex stainless steel contains higher levels of chromium, molybdenum, and nitrogen compared to standard Duplex steel, resulting in greater mechanical strength and superior corrosion resistance. Duplex grades such as 2205 are suitable for moderate environments, whereas Super Duplex grades like UNS S32750 and UNS S32760 are designed for severe, high-pressure, and seawater applications.
Which industries use Super Duplex stainless steel?
Super Duplex stainless steel is widely used in industries such as oil and gas, chemical processing, marine and offshore engineering, power generation, desalination plants, and petrochemical industries where high strength and long-term corrosion resistance are critical.
What grades of Super Duplex stainless steel are available?
Commonly available Super Duplex stainless steel grades include UNS S32750 and UNS S32760 (also known as 2507). In some applications, Duplex grade S32205 is also used where moderate corrosion resistance and strength are sufficient.
People Searched for Super Duplex
Super Duplex steel round washers, Super Duplex steel lock washers, Super Duplex 2507 Belleville washers, Super Duplex steel spherical washers, Super Duplex steel serrated washers, Super Duplex steel taper washers, Super Duplex steel wave washer, Super Duplex steel hex washers, Super Duplex steel S32750 bonded sealing washers, UNS S32750 / S32760 split washers, Super Duplex steel external tooth lock washer, Super Duplex steel machine washers, Super Duplex steel finishing washers, Super Duplex steel shim washers, Super Duplex steel tab washers, Super Duplex steel torque washers, Super Duplex steel c washers, Super Duplex steel fender washers, Super Duplex steel slotted washers, Super Duplex steel dome washers (S32750), Super Duplex steel curved spring washers, Super Duplex steel bevel washers, Super Duplex steel hillside washers, Super Duplex steel hexagonal washers, Super Duplex steel tooth washers, Super Duplex steel fasteners washers, Super Duplex steel washer distributor, Super Duplex washer manufacturer in Maharashtra, Super Duplex steel washer supplier in India (Mumbai), Super Duplex steel washer exporter, Super Duplex steel washer dealer in India, Super Duplex steel washer price list India.