Super Duplex Bolts and Nuts

Super Duplex Bolts and Nuts

Super Duplex Bolts and Nuts

Super duplex bolts and nuts are made from super duplex material. Super duplex belongs to a family of stainless steel that has ferritic and austenitic stainless steel metallic microstructures. The advantage of duplex is that it has the strength from ferritic and the corrosion resistance from the austenitic steel structures. So the Super Duplex Fasteners can both perform under high stress and under high corrosion risk environments.

The Super duplex stainless steel bolts are useful and do not corrode in the long run, making them preferable for applications which need frequent removal and installation of parts with bolts and nuts. Naman Pipe & Tubes is a manufacturer and supplier of different Super Duplex Stainless Steel Fasteners to be used in different industries such as the heating and cooling applications, sea water and marine applications, oil and gas, petroleum refineries and in chemical industries as well. Our Super Duplex Fasteners & Fixings are of high quality and are tested according to the international standards. You can rely on the specific types made by us such as the Super Duplex Hex Head Fasteners which are made with a hex head for easy installation like a hex bolt or nut. Please contact us for further information regarding Super Duplex Fixings and Fasteners.

Super Duplex Bolts and Nuts Available Sizes

Hot Forged Nut Bolt

Up to M36 / 1-1/2” Dia, up to 1100mm lg

CNC Machined Bolts and Nuts

Up to M100 / 4” Dia, up to 1500mm lg

Screw Size

M02 - M33 or Custom


3 - 200 mm

Standard Specification of Super Duplex Stainless Steel Fasteners

ASTM Standard ASTM A 479 ASME SA 479
International Standards DIN, EN, JIS, ASTM, BS

Bolts material

U Bolts, Hex Head Bolts, Hex Bolts, Square Bolts, Flange Bolts, Counter sunk Bolts, Eye Bolts, T Bolts, Lag Bolts

Nut material

Lock Nut, Dome Nut, Acorn Nut, Wing Nut, Coupling Nut, Square Nut, Panel Nut, T Nut, Hex Head Nut, Eye Nut

Screw material

Shoulder Screws, Panel Screws, Socket Set Screws, Socket Head Screws, Concrete Screws, Threaded Screws, Hex Head Cap Screws, Machine Screws, Blind Rivet, Anchor Screws

Washer material

Sealing Washer, Machine Washers, Split Washer, Flat Washer, Lock Washer, Star Washers

Common types of SDSS Fasteners & Fixings

Super Duplex Stainless Steel Fasteners

Super Duplex Stainless Steel Fasteners

  • Studs
  • Threaded Rod
  • Hex Bolt
Super Duplex Bolts and Nuts

Super Duplex Bolts and Nuts

  • Hex Head Bolts
  • Hex Head Cap Screws
  • Socket Head Cap Screws

Super Duplex Fasteners Price Ex Mumbai

Type of Fasteners INR /Unit
Hex head Bolt (SET M12X 25) INR 150/Unit
Screw (SET M12X 25) INR 200/Unit
Hex Nut Stud Bolt (M16 X 150MM) INR 620/Unit
Lock Washer and Spring Washer (16X32 type m) INR 410/Unit

Know more about Strength, Torque and Heads of super duplex Bolts

The super duplex bolts are used in many heavy applications that need strength and corrosion resistance. The bolts come in different head types. There are hex bolts, square bolts and other types that are common. The strength depends on the material but super duplex in general can have up to 600MPa of minimum yield strength. The allowable torque is the tilting force that could be applied on the bolt. And this value differs per number of threads and the nominal diameter in inches. The ½ inch bolt with 20 threads would have a 36.0 ft-lb torque while a 13 thread bolt will have a torque of 49.1 ft-lb when lubricated. There are charts and tables to find the torques for different types of bolt heads and threads.

UNS S32750 / S32760 Alloy 2507 Bolts/ Nuts Chemical Composition

C N P Si Mn Mo Ni Cr S Cu
00.030 00.24/00.32 00.035 00.80 1.20 3.0/5.0 6.00/8.00 24.0/26.0 00.020 0.50-1.00

Mechanical Properties of Alloy 2507 S32750 / S32760 Nut Bolt

Density Melting Range Yield Stress (0.2%Offset) Tensile Stress Elongation
7.8 g/cm3 2460 °F, 1350 °C 80000Psi , 550MPa 116000Psi , 800MPa 15 %
  • S32760 Condition A
    28 HRC Maximum, accordance to NACE MR0103-2005
  • S32760 Condition S
    36 HRC maximum, accordance to ISO 15156-3, NACE MR0175

SDSS 2507 UNS S32750 / S32760 Fasteners Equivalent Standards

UNS S32750 F53 1.4410 Alloy 2507
UNS S32760 F55 1.4501 Zeron 100
UNS S32250 F61 1.4507 Alloy 255