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Duplex Fasteners

Duplex Fasteners, Duplex Bolts, Stud Bolts, Nuts, Screws, Washers & Threaded Rod Supplier in Mumbai, India

Unifit Metal Alloys is a manufacturer and supplier of Duplex Fasteners, offering corrosion-resistant fastening products for industrial applications that require a combination of strength and reliable performance. We supply Duplex bolts, nuts, washers, screws, stud bolts and other fasteners in different sizes, dimensions and specifications to meet individual project requirements.

Duplex stainless steel is known for its two-phase metallurgical structure, combining austenitic and ferritic characteristics. This structure provides a useful balance of mechanical strength and corrosion resistance. Duplex Fasteners are therefore suitable for service conditions where both high load-bearing capability and protection against corrosive media are required.

Duplex Fasteners, Bolts, Nuts, Studs, Screws, Washers & Threaded Rods Manufacturer and Supplier in Mumbai, India

Our range includes Duplex Bolts, Duplex Nuts, Duplex Stud Bolts, Duplex Screws, Duplex Washers, Duplex Threaded Rods, Hex Bolts, Heavy Hex Nuts, Socket Head Cap Screws, U-Bolts and Anchor Bolts. Common Duplex grades such as UNS S31803 and UNS S32205 can be supplied according to the required material specification and application. Duplex Fasteners provide good resistance to pitting corrosion, crevice corrosion and chloride-induced stress corrosion cracking. They also offer higher mechanical strength than many conventional austenitic stainless steel grades. These characteristics make them suitable for demanding environments involving seawater, chlorides, chemicals and elevated mechanical loads.

At Unifit Metal Alloys, we supply Duplex Fasteners in standard as well as customized dimensions. Fasteners can be provided with different thread forms, finishes and configurations based on customer drawings, specifications and service requirements. We focus on dimensional accuracy and consistent material quality throughout the supply process.

Get the Best Quote for Duplex Fasteners. We Stock Duplex Bolts, Nuts, Studs, Screws, Washers and Threaded Rods in Various Sizes and Specifications. Contact Us Today for a Competitive Quote.

Duplex Fasteners Specifications

Specifications
Duplex Fasteners Material Specification 2205 Duplex Bolts, UNS S31803 Bolts
Standard DIN, UNI, ISO, JIS, GB, IS, BS, ASME, ANSI, ASTM, and all International Standards
Duplex Fasteners/ Bolts Size M2, M2.5, M3, M4, M5, M6, M8, M10, M12, M14, M16, M20, M24, M30, M36 to M160
Length 3 mm to 200 mm
Duplex Bolts, Studs Threads: METRIC, BSW, BSF, UNC, UNF, or as required
Duplex Steel Fasteners Standard: ANSI – American National Standards Institute
  • ANSI B 18.2.4 2M
  • ANSI B 28.2.4 1M
  • Duplex Steel Stud Bolt length is defined in ASME B16.5 standard
  • Duplex Steel Hex nuts are defined in ASME B18.2.2
  • ASME B18.5
DIN: DIN 931, DIN 933, DIN 934, DIN 970 UTS – Unified Thread Standard: UNC, UNF, UNEF, UNS, NPT, NPTF ISO – International Organization for Standardization: ISO 4032, ISO 4033, JIS standards
Source of raw materials Tata Steel, JSPL, RINL, Usha Martin, Dhamma Steel, Mukund Steel, etc.
SCOPE OF MANUFACTURE
  • Hot Forged Duplex Fasteners, Nut / Bolt; up to M36 / 1-1/2” Dia, up to 1100mm lg
  • CNC Machined Duplex Fasteners, Nut / Bolt; up to M100 / 4” Dia, up to 1500mm lg
Duplex Fasteners In Form of: Hex, Square, Round, Threading as per Gauge Etc.
Head drive: Phillips, Slotted, Phillips/Slot, Six-Lobe, etc
Duplex bolting Test Certificate: Manufacturer Test Certificate as per EN 10204 / 3.1
Duplex Fasteners finishing: Zinc (yellow, white, blue, black), black oxide, Geometry, Dacroment, anodizing, nickel-plated, plated zinc-nickel, Duplex Steel: Passivated Self-Colour, Hot Dip Galvanised (HDG), Bright Zinc Plated (BZP), Sherardized, Duplex Steel, Mechanically Applied coating, and some special one like DACROMET
Production process M2-M24: Cold Forging, hot forging M24-M100, machining, and CNC for Customized connecting element
Duplex bolting materials Surface Coating:
  • Teflon Coated Fasteners
  • Phosphate Coated Fasteners
  • Zinc Coated Fasteners
  • PTFE Coated Duplex Steel Fasteners
  • Xylon Coated Fasteners
  • Cadmium Coated Fasteners
  • Hot Dipped Galvanizing Coated Fasteners
All surface finishes offered including Geomet & PTFE, Galvanised, Zinc, Electroless Nickel, Sherardized, Dacromet
Popular Types of Duplex Steel Bolts Hex Bolts, Flange Bolts, Hex Head Bolts, Lag Bolts, Square Bolts, Eye Bolts, U Bolts, T Bolts, Countersunk Bolts, etc.
Popular Types of Duplex Steel Nut Eye, Dome, Hex Head Nut, Panel, Lock, Coupling, Square, Acorn, T, Wing, etc.
Popular Types of Duplex Steel Screw Socket Set Fasteners, Anchor Fasteners, Blind Rivet, Threaded Fasteners, Socket Head Fasteners, Machine Fasteners, Concrete Fasteners, Shoulder Fasteners, Panel Fasteners, Hex Head Cap Fasteners, etc.
Popular Types of Duplex Steel Washer Machine Washers, Star Washers, Flat Washer, Lock Washer, Split Washer, Sealing Washer, etc.
Duplex Fasteners Packing: IN BULK: canton, pallet, Small Boxs / carton/pallet, or customer request

Duplex Fasteners Size Chart

SIZE GRADE ASME ISO ASTM
M1.6 to M64 12.9 B18.3.1 M 4762 A574M
M3 to M20 012.9 B18.3.5M 10642 F835M
M3 to M12 012.9 B18.3.4M 7380 F835M
M4 to M20 10.9
M6 to M24 012.9 B18.3.3M
M3 to M10 012.9 F835M
M3 to M20 45H B18.3.6M 4028 F912M
M3 to M12 45H B18.3.6M 4027 F912M
M3 to M20 45H B18.3.6M 4029 F912M
M6 to M12 45H B18.3.6M 4026 F912M
M3 to M20 45H B18.3.6M 4029 F912M
M8 to M22 –

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Mechanical Properties for Duplex Fasteners

Element S31803 / S32205 S32750 / S32760
Density (g/cm 3) 7.805 7.8
Density (lb/in 3) 0.285 0.281
Melting Point (°C) 1420 – 1465 1350
Melting Point (°F) 2588 – 2669 2460

Ready Stock of Duplex Fasteners

Duplex Bolts
Duplex Nuts
Duplex Stud Bolts
Duplex Screws
Duplex Washers
Duplex Threaded Rods
Duplex Hex Bolts
Duplex Heavy Hex Nuts
Duplex Socket Head Cap Screws
Duplex U-Bolts
Duplex Anchor Bolts
Duplex Eye Bolts

Duplex Fasteners Application Industries

Refineries
90%
Oil and Gas Industry
96%
Power Generation
80%
Pharmaceutical Equipment
85%
Pulp & Paper Industry
88%

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