Super duplex fasteners

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Super duplex fasteners
What is Super duplex fasteners ?

Super duplex material has chromium, molybdenum and nickel in its alloy and is available in different grades. They have both ferritic and austenitic microstructure and properties from both. The super duplex fasteners show high resistance to different types of corrosion like pitting and crevice due to high chromium content.

They can also withstand corrosion fatigue and chloride ion related stress corrosion cracking. Super duplex steel washer can be used in a wide range of environments including the general corrosive acids. The super duplex material has a high mechanical strength and it can be used in various high stress applications like ballast water systems.

Reputed super duplex stainless steel bolts manufacturers also confirm that the products can be used in marine and seawater environments. They are ideal for critical systems like flue gas desulphurization and oil & gas exploration. The ASTM A1082 UNS S32750 stud are known for their durability and toughness.

Table of content

We are the manufacturer of Alloy 2507 bolts and nuts in India with the lowest price as per ASTM A1082 . see super duplex 2507 fasteners most common grades

What are some of the most common super duplex bolts grades?

The most common super duplex bolts grades are UNS S32750, UNS S32760, UNS S32550, UNS S32707, UNS S39274 and UNS S32727. They have slightly different chemical compositions and mechanical properties and are chosen as per application requirements.

We are oldest super duplex bolts and studs supplier and stockist in Mumbai, see super duplex stainless steel fasteners machining process

Super duplex 2507 fasteners

Super duplex 2507 fasteners

UNS S32750 stud

UNS S32750 stud

Super duplex bolts

Super duplex bolts

Is super duplex 2507 fasteners machining difficult?

The super duplex 2507 fasteners can be hard to machine due to their high strength, toughness and dual microstructure. They can also work-harden quickly during the machining process.

We keep an inexpensive stock of super duplex 2507 hex bolts and screws in diameter ranging from metric M1.2 – M48 , or we may create a custom order also with prompt delivery.

Super duplex fasteners specification
Super duplex fasteners specification


CNC Machined Hot Forged Length
upto M100/ 4" Dia upto M39/ 1-1/2" Dia upto 3500 mm
Specification Grade Thread
ASTM A1082 | ASME SA1082 Super Duplex 2507 (UNS S32760/S32750 )
The most recent price list for super duplex stainless steel fasteners in a range of sizes is available on our website, explore more available types
Most popular types of super duplex 2507 fasteners
WNR 1.4410 threaded rod

WNR 1.4410 threaded rod

  • BSF
  • BSW and UNC
UNS S32760 screws

UNS S32760 screws

  • ASTM A1082 | ASME SA1082
  • Size: 3/6 to 2 inch
  • Length: 3 to 200 mm
Super duplex stainless steel nuts

Super duplex stainless steel nuts

  • Slotted
  • Phillips
  • Six-Lobe
We only offer the best-quality UNS S32750 threaded rod, socket cap screws and WNR 1.4410 washer, dowel pin in a variety of finishes online, see mechanical and chemical properties
Alloy 2507 bolts equivalent
Super Duplex  S32760/S32750  1.4410
UNS S32750 stud mechanical properties
Ultimate Tensile Strength, ksi 116 min.
Hardness Rockwell C 32 max.
0.1% Offset Yield Strength 0.2%, ksi 91 min.
Elongation in 2 inches, % 15 min.
0.2% Offset Yield Strength 0.2%, ksi 80 min.
Impact Energy, ft.-lbs. 74 min.
WNR 1.4410 threaded rod chemical properties
Others N C Cr Mo Ni
S=0.001 0.27 0.020 25 4.0 7
Is it safe to use super duplex 2507 bolts in H2S environments?

The super duplex 2507 bolts can be used in hydrogen sulfide or H2S environments with careful consideration. H2S is a highly corrosive gas that can cause sulfide stress cracking and hydrogen induced cracking in certain materials. But 2507 material has high corrosion resistance properties and its dual microstructure is perfect for the H2S-containing environments. However, it should be properly heat treated and ensured that its properties are at par with application requirements like temperature, pressure, etc. Also, the Duplex 2507 U-bolts must be properly installed and tightened to ensure that there is no risk of failure.

What is the distinction between Duplex 2205 and Super Duplex 2507?
  • Alloy 2507 Hex Nuts material has higher chromium and other element content than 2205. Thus, they offer higher level of corrosion resistance in different harsh environments.
  • 2507 stainless steel dowel pin shows superior resistance to pitting and crevice corrosion than duplex 2205.
  • 2507 also has higher tensile and yield strengths along with better mechanical properties.
  • SAF 2507 Socket Cap Screws are more expensive than 2205 ones.
What are the applications for super duplex stainless steel fasteners?

The super duplex stainless steel fasteners are used in various industries due to its high strength, corrosion resistance, durability and other mechanical properties. The WNR 1.4410 threaded rods can be used in applications of oil & gas, chemical processing, desalination plants, aerospace and pulp & paper industries. The ASME SA1082 UNS S32760 screws are also found in seawater and saltwater applications along with water treatment plants.

Weight chart of duplex 2507 nuts
super duplex nuts size Heavy Hex Jam Heavy Hex Finished Hex Heavy Square Finished Jam Square
5/8″ 6.96 11.9 7.33 14.3 4.93 10.8
1/2″ 4.00 6.54 3.75 7.87 2.62 5.78
3/4″ 11.0 19.3 11.9 23.5 7.70 15.4
1″ 23.5 42.5 28.3 51.5 17.6 36.3
7/8″ 16.7 29.7 19.0 36.2 12.0 24.5
11/4″ 45.8 78.6 54.3 95.5 36.1 70.6
11/8″ 32.4 59.2 40.3 72.4 24.7 52.5
13/8″ 59.3 102 73.0 125.0 47.9 94.5
15/8″ 91.6 162
11/2″ 74.8 131 94.3 161 60.9 122
13/4″ 114 204 151 100
2″ 165 299 224 140
17/8″ 134 241
21/4″ 227 419
4″ 1200 2180
23/4″ 429 738
21/2″ 332 564
3″ 545 950
31/2″ 851 1526
31/4″ 651 1194
33/4″ 1005 1812
Finishes of super duplex stainless steel fasteners
  • Hot Dipped Galvanized(HDG)
  • Zinc Plated
  • Zinc and Chromate
  • Plain Finish
  • Zinc and Yellow Chromate