Duplex Bolts and Nuts

Duplex Stainless Steel Bolts and Nuts

Duplex Stainless Steel Bolts and Nuts

Duplex Steel Bolts and Nuts are used in applications that require high corrosion stress resistance and high strength. The duplex material is especially resistant to chloride ion corrosion stress. This property makes the bolts and nuts be used in sea water, marine and food processing industries mainly. Naman Pipe & Tubes is a leading manufacturer of duplex bolts and nuts. As a Duplex Fasteners Manufacturer we produce all kinds of fasteners in different duplex steel grades. There are three main categories of duplex material; standard duplex, lean duplex and super duplex.

These are named according to the chromium nickel and molybdenum contents in them. So the Duplex Steel Nut Bolts produced in each category have the different mechanical properties. The DSS fasteners are long lasting and cost effective in the long run compared to other metallic fasteners. The bolts and nuts are also used in industries such as petroleum, oil and gas, pharmaceuticals, heat exchangers and power plants. Some of the A276 Fixings are recommended for high temperature services in high pressure levels. We manufacture and supply the different grades of fasteners to be used in different application requirements. Please contact us for any of your Duplex Stainless Steel Fasteners needs and we are here to serve you.

Duplex Bolts and Nuts 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

Duplex Fasteners Specifications

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

Types of Bolts

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

Types of Nut

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

Types of Screw

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

Types of Washer

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

Different Types of Duplex Steel Nut Bolts

Duplex Stainless Steel Fasteners

Duplex Stainless Steel Fasteners

  • 12 Point Screws
  • Hex Head Cap Screws
  • Socket Head Cap Screws
  • Hex Head Bolts
  • Wedge Anchor Bolts
  • Shoulder Bolts
Duplex Steel Nut Bolts

Duplex Steel Nut Bolts

  • Hex Nuts
  • Lock Nuts
  • Studs
  • Threaded Rod
  • Flat Washers
  • Weld Studs

Duplex Stainless Steel Fasteners Price in India

Type INR Per Unit
DSS Bolt (SET M12X 25) INR 154 Per Unit
DSS Hex Nut with Stud Bolt (M16 X 150MM) INR 505 Per Unit
DSS Stud Bolt with Hex Nut (M16 X 150MM) INR 505 Per Unit
DSS Screw(SET M12X 25) INR 154 Per Unit
DSS Lock Washer and Spring Washer (16X32 type m) INR 354 Per Unit

How many types of Heads & threads come in Duplex Bolts?

The duplex material is used for different types of bolts and nuts. Depending on the purpose and the service, the types and shapes differ. There are hex bolts, carriage bolts, lag bolts and eye bolts. And the threads vary such as unified national coarse, unified national fine, unified national extra fine, unr threads, unk threads, constant pitch threads and UNJC threads and UNJF threads. All these threads could come in combination with all the bolt head types. This makes a diversity of different heads in combination with different threads. And all of these could be produced in duplex material as well.

Chemical Composition of UNS S31803 / S32205 Fasteners

UNS S31803 / S32205 C N P Si Mn Mo Fe Cr S Ni
1.0 00.03 00.02 2.0 3.0 - 3.5 22.0 - 23.0 00.03 4.5 - 6.5 00.14 - 00.2 Bal

Mechanical Properties of DSS S31803 / S32205 Nut Bolt Fastener

UNS S31803 / S32205 Density Melting Range Yield Stress (0.2%Offset) Tensile Stress Elongation
7.8 g/cm3 2460 °F, 1350 °C, 80000 Psi, 550 MPa 116000 Psi, 800 MPa 15 %

Alloy 2205 S31803 / S32205 Bolting material Equivalent Grades

UNS S31803 A193 SA 193 1.4462
UNS S32205 A193 SA 193 1.4462