Duplex Fasteners

Product Details:

Aashish Metal & Alloys is a leading manufacturer and exporter of UNS S31803 Duplex Fasteners, designed for superior mechanical strength and exceptional corrosion resistance in demanding industrial applications. Made from Duplex Stainless Steel UNS S31803, these fasteners have a balanced microstructure of austenite and ferrite, offering nearly twice the strength of conventional austenitic stainless steels and excellent resistance to pitting, crevice corrosion, and chloride stress corrosion cracking.

Material Grade

• Duplex Stainless Steel UNS S31803

• ASTM A479 / ASTM F60

Types of Fasteners

• Bolts (Hex, Heavy Hex, Eye, Carriage)

• Nuts (Hex, Heavy Hex, Nylock)

• Washers (Flat, Spring, Lock)

• Screws (Socket Head, Machine, Self-Tapping)

• Studs & Threaded Rods

• Custom fasteners as per drawing or specification

Key Features

• High tensile and yield strength (almost double that of standard stainless steel)

• Excellent resistance to chloride stress corrosion cracking

• Superior pitting and crevice corrosion resistance (PREN ≥ 35)

• Good weldability and machinability

• Long service life in aggressive environments

Applications
UNS S31803 Duplex Fasteners are widely used in:

• Offshore & marine engineering

• Oil & gas processing equipment

• Desalination plants

• Chemical & petrochemical processing units

• Pulp & paper industry

• Heat exchangers, condensers, and pressure vessels

Mechanical Properties (Typical for UNS S31803)

• Tensile Strength: 620 MPa min

• Yield Strength (0.2% offset): 450 MPa min

• Elongation: 25% min

• Hardness: 293 HB max

Size Range

• Bolts & Screws: M6 to M100 (¼″ to 4″)

• Nuts: M6 to M100

• Washers: 3 mm to 72 mm thickness

• Studs & Threaded Rods: Length up to 5 meters

• Custom sizes available as per requirement

Thread Size

• NPT: ⅛″ to 4″

• BSP / BSPT: ⅛″ to 4″

• Metric Threads: M10 to M100

• Custom thread profiles available

Working Temperature

• Service range: -50°C to +300°C (application dependent)

Surface Finish

• Natural metallic finish

• Bright zinc plated

• Hot-dip galvanized

• PTFE coated

• Electro-polished

• Black oxide finish

Surface Treatment

• Passivation

• Electro-polishing

• Anti-rust oil coating

Quantity per Pack

• Small sizes (M6–M12): 100–500 pcs/pack

• Medium sizes (M16–M30): 25–100 pcs/pack

• Large sizes (M36 and above): 5–25 pcs/pack

• Bulk packing as per client requirement

Colour

• Standard silver metallic

• Black (oxide or PTFE coating)

• Custom coating colours available

Production Capacity

• 120 Metric Tons per Month

Product & Service Code

• HS Code: 73181500

Additional Information:

• Item Code: AMA-7318-UNS
• Production Capacity: 120 Metric Tons per Month
• Delivery Time: READY STOCK EX-WORKS MUMBAI
• Packaging Details: Export-worthy wooden boxes, cartons, or gunny bags Protective coating to prevent corrosion during transit Marking with grade, size, heat number, and manufacturer details for traceability

Product Details:

Aashish Metal & Alloys – Manufacturer & Exporter of UNS S32205 Duplex Fasteners

Aashish Metal & Alloys manufactures and exports premium-quality UNS S32205 Duplex Stainless Steel Fasteners, designed for superior strength, durability, and corrosion resistance in aggressive environments. Duplex S32205 offers a balanced microstructure of austenite and ferrite, providing double the strength of conventional stainless steels along with excellent resistance to pitting, crevice corrosion, and stress corrosion cracking, particularly in chloride-rich conditions.

Specifications:

• Material Grade: UNS S32205 / ASTM A182, A479, A276

• Type: Bolts, Nuts, Washers, Screws, Studs, Threaded Rods, and custom fasteners

• Size Range: M6 to M100 & 1/4" to 4" (diameter)

• Thread Types: Metric, UNC, UNF, BSW, BSF, ACME, or custom

• Surface Finish: Plain, Zinc Plated, Hot Dip Galvanized, PTFE Coated, or as specified

• Standards: ASTM, ASME, DIN, ISO, BS, JIS, GOST

• Shape: Hex, Square, Round, or custom profile

Mechanical Properties:

• Tensile Strength: ~620 MPa (90 ksi)

• Yield Strength: ~450 MPa (65 ksi)

• Hardness: 290 HB max

Key Features:

• Excellent resistance to seawater and chloride-induced corrosion

• High mechanical strength and toughness at both low and high temperatures

• Extended service life in aggressive and offshore applications

Applications:

• Offshore oil & gas platforms

• Marine equipment

• Chemical processing plants

• Desalination plants

• Heat exchangers and pressure vessels

Production Capacity: 150 MT per month
Product & Service Code: 73181500 / 73181600 (as per fastener type)
Packaging Detail: Packed in corrugated boxes, HDPE/poly bags, and wooden pallets or crates for seaworthy export

Additional Information:

• Item Code: AMA-7318-UNS-S32205
• Production Capacity: 150 MT per month
• Delivery Time: READY STOCK EX-WORKS MUMBAI
• Packaging Details: Packed in corrugated boxes, HDPE/poly bags, and wooden pallets or crates for seaworthy export

Product Details:

AASHISH METAL & ALLOYS – MANUFACTURER & EXPORTER OF UNS S32760 SUPER DUPLEX FASTENERS

Aashish Metal & Alloys is a reliable manufacturer and exporter of UNS S32760 Super Duplex Fasteners, designed for extreme conditions where high strength and exceptional corrosion resistance are critical. These fasteners are ideal for offshore, marine, chemical, and energy sectors where conventional stainless steels fail.

ABOUT UNS S32760:
UNS S32760 is a super duplex stainless steel with a mixed austenitic-ferritic structure, offering twice the strength of 300 series stainless steels and outstanding resistance to pitting, crevice corrosion, and stress corrosion cracking. It contains high levels of chromium, molybdenum, and tungsten, making it ideal for harsh, chloride-rich environments.

PRODUCT RANGE:

• Hex Bolts & Nuts

• Socket Screws, Cap Screws

• Stud Bolts, Threaded Rods

• Washers (Flat, Spring, Plain)

• U-Bolts, Eye Bolts, Anchor Bolts

• Custom Fasteners as per drawing

FEATURES:

• High strength & excellent fatigue resistance

• PREN > 40 for superior pitting resistance

• Excellent performance in sour gas (H₂S) conditions

• Long-term reliability in corrosive and high-pressure environments

APPLICATIONS:

• Offshore Oil & Gas Rigs

• Desalination & Water Treatment Plants

• Marine Equipment & Coastal Structures

• Petrochemical & Chemical Processing

• Subsea & Riser Systems

• Pulp and Paper Industry

SIZE RANGE:

• Diameter: M6 to M48 / 1/4” to 2”

• Length: 10 mm to 300 mm

• Threads: Metric, UNC, UNF, BSW, NPT

STANDARDS:

• ASTM A479 / A182 F55

• ASME B18.2.1, B18.2.2

• NACE MR0175 / ISO 15156

• DIN / ISO / BS (on request)

SURFACE FINISH OPTIONS:

• Self (Natural)

• PTFE Coated (Blue, Green, etc.)

• Zinc Plated / Electro-Polished

• Customized on request

COLOUR OPTIONS (If Coated):

• Blue (Standard PTFE)

• Green, Red, White, Black

• Custom RAL shades available

• Natural silver-gray for uncoated parts

QUANTITY PER PACK:

• M6–M12: 50–100 pcs

• M14–M24: 25–50 pcs

• M27–M48: 5–20 pcs
  • Custom packing available

PRODUCTION CAPACITY:

• Up to 250,000 pcs/month

• High-speed production and strict QC

• Fast delivery for bulk and urgent orders

PRODUCT & SERVICE CODE:

• HSN Code: 7318

• Product Code: AMA_S32760_FASTENER

• Service Code: AMA_SVC_SUPERDUPLEX

PACKAGING DETAIL:

• HDPE Bags, Corrugated Boxes, Wooden Crates

• ISPM-15 compliant export packaging

• Labels include: Size, Grade, Heat No., Qty, Order Ref

WHY CHOOSE US:
✓ ISO Certified Manufacturer
✓ In-house Testing & Documentation
✓ Global Export Experience
✓ Custom Sizes, Threads & Coatings
✓ Prompt Service & Competitive Pricing

Additional Information:

• Item Code: AMA_S32760_FASTENER
• Production Capacity: Up to 250,000 pcs/month
• Delivery Time: READY STOCK EX-GODOWN MUMBAI
• Packaging Details: HDPE Bags, Corrugated Boxes, Wooden Crates ISPM-15 compliant export packaging Labels include: Size, Grade, Heat No., Qty, Order Ref

Product Details:

UNS S32750 Super Duplex Fasteners – Manufactured & Exported by Aashish Metal & Alloys

Aashish Metal & Alloys is a trusted manufacturer and global exporter of UNS S32750 Super Duplex Fasteners, engineered for the most demanding industrial applications. These fasteners are known for their exceptional mechanical strength, excellent corrosion resistance, and superior performance in aggressive environments such as seawater, chemical processing, and offshore oil & gas operations.

What is UNS S32750?
UNS S32750 is a Super Duplex stainless steel with a ferritic-austenitic structure, offering a perfect balance of strength and corrosion resistance. It has high levels of chromium (24-26%), molybdenum (3-5%), and nitrogen, making it highly resistant to pitting, crevice corrosion, and stress corrosion cracking.

Product Range:
We offer a wide variety of UNS S32750 Fasteners including:

• Hex Bolts & Nuts

• Stud Bolts & Threaded Rods

• Socket Head Cap Screws

• Washers, Set Screws, U-Bolts

• Custom fasteners as per drawing

Key Features:
✔ High tensile & yield strength
✔ Excellent resistance to chlorides and sulfide stress environments
✔ Exceptional resistance to pitting & crevice corrosion (PREN > 40)
✔ Long service life in harsh offshore, marine & chemical environments
✔ Good weldability and workability

Size Range:

• Diameter: M6 to M48 / 1/4” to 2”

• Length: 10 mm to 300 mm / 1/2” to 12”

• Threads: Metric, UNC, UNF, BSW, NPT (as per client spec)

Applications:

• Offshore oil & gas platforms

• Desalination plants

• Heat exchangers & pressure vessels

• Marine & shipbuilding

• Petrochemical and chemical processing plants

• Subsea piping systems

Material Standards:

• ASTM A479 / A182

• ASME B18.2.1, B18.2.2, B18.3

• NACE MR0175 / ISO 15156

• DIN / ISO / BS Standards (on request)

Surface Finishes Available:

• Natural / Self-Finish

• PTFE Coated

• Zinc Plated

• Hot Dip Galvanized

• Electro-Polished (on request)

Production Capacity:

• Up to 250,000 pieces/month

• Fast turnaround on standard and custom orders

• In-house testing & certification

Product & Service Code:

• HSN Code: 7318

• Product Code: AMA-SD-FST-S32750

• Service Code: AMA-SVC-FASTENER

Packaging Detail:

• Rust-free HDPE bags

• Corrugated export cartons

• Fumigated wooden crates/pallets (ISPM-15 compliant)

• Clearly labeled with heat no., grade, size, and order reference

Why Choose Aashish Metal & Alloys?
✓ ISO certified manufacturer
✓ In-house quality inspection & third-party testing
✓ Export to over 25+ countries
✓ Custom sizes, coatings, and packaging available
✓ Timely delivery with complete traceability

Additional Information:

• Item Code: AMA-SVC-FASTENER-7318
• Production Capacity: Up to 250,000 pieces/month
• Delivery Time: READY STOCK EX-WORKS MUMBAI
• Packaging Details: Rust-free HDPE bags Corrugated export cartons Fumigated wooden crates/pallets (ISPM-15 compliant) Clearly labeled with heat no., grade, size, and order reference

Product Details:

Aashish Metal & Alloys is a reputed manufacturer and exporter of high-quality Duplex 2507 Fasteners, crafted from super duplex stainless steel grade UNS S32750. Known for their outstanding strength, corrosion resistance, and durability, these fasteners are ideal for demanding applications in harsh environments.

Key Features of Our Duplex 2507 Fasteners:

• Superior Corrosion Resistance: Excellent resistance to pitting, crevice corrosion, and stress corrosion cracking, especially in chloride-rich and aggressive media.

• High Mechanical Strength: Roughly twice the strength of standard austenitic stainless steel, ensuring enhanced structural integrity.

• Wide Range of Fastener Types: Includes bolts, nuts, screws, studs, washers, and custom designs.

• Precision Manufacturing: Manufactured to strict tolerances with smooth finishes for reliable performance and ease of installation.

• Temperature Tolerance: Suitable for operating temperatures up to 300°C (572°F).

• Compliance with Standards: Produced in accordance with ASTM A276, ASTM A193, ASTM A194, ISO, and other international norms.

Applications:

Duplex 2507 Fasteners are widely used in:

• Oil & Gas Exploration and Refining

• Chemical and Petrochemical Industries

• Marine and Offshore Structures

• Power Generation

• Desalination Plants

• Pulp & Paper Industry

Production Capacity: Equipped with modern facilities, we can manufacture up to 50,000 pieces annually, meeting large-scale project demands with consistent quality.

Packaging Detail: Each fastener is cleaned, coated with protective oil if required, and packed in corrosion-resistant packaging such as polybags, cartons, or wooden boxes. Export packaging adheres to international standards to ensure damage-free shipment.

If you want, I can also add details like size range, surface finish, quantity per pack, colour, product & service code and more for your catalog. Would you like me to prepare that?

Additional Information:

• Item Code: SM-FASTENER-DP2507-009
• Production Capacity: up to 50,000 pieces annually
• Delivery Time: READY STOCK EX-WORKS MUMBAI
• Packaging Details: Each fastener is cleaned, dried, and coated with protective oil (if required), then packed in moisture-resistant polybags or cartons. Larger quantities are packed in sturdy wooden crates with cushioning materials to prevent damage during transit. Export packaging complies with international shipping standards to ensure safe delivery.

Product Details:

Aashish Metal & Alloys is a trusted manufacturer and exporter of high-performance Duplex Fasteners, engineered for superior strength and corrosion resistance in demanding industrial environments. Manufactured from Duplex Stainless Steels such as UNS S31803 and UNS S32205, these fasteners combine the benefits of austenitic and ferritic stainless steels, delivering excellent mechanical properties and exceptional resistance to stress corrosion cracking, pitting, and crevice corrosion.

Material Grades

• Duplex 2205 (UNS S31803 / S32205)

• Other Duplex grades available on request

Types of Fasteners

• Bolts (Hex, Heavy Hex, Eye, Carriage)

• Nuts (Hex, Heavy Hex, Nylock)

• Washers (Flat, Spring, Lock)

• Screws (Socket Head, Machine, Self-Tapping)

• Studs & Threaded Rods

Key Features

• High tensile and yield strength, almost twice that of standard austenitic stainless steels

• Excellent resistance to chloride stress corrosion cracking

• Outstanding pitting and crevice corrosion resistance (PREN ≥ 35)

• Good weldability and formability

• Superior performance in seawater and aggressive chemical environments

Applications
Duplex Fasteners are widely used in:

• Offshore & marine engineering

• Oil & gas processing plants

• Desalination plants

• Pulp & paper industry

• Heat exchangers, pressure vessels, and storage tanks

• Chemical processing units

Mechanical Properties (Typical for Duplex 2205)

• Tensile Strength: 620 MPa min

• Yield Strength (0.2% offset): 450 MPa min

• Elongation: 25% min

• Hardness: 293 HB max

Production Capacity

• 120 Metric Tons per Month

Product & Service Code

• HS Code: 73181500

Packaging Details

• Export-worthy seaworthy wooden boxes, cartons, or gunny bags

• Proper coating/oiling to prevent rust during transportation

• Marking includes size, grade, heat number, and manufacture

Additional Information:

• Item Code: AMA-7318-DU
• Production Capacity: 120 Metric Tons per Month
• Delivery Time: READY STOCK EX-WORKS MUMBAI
• Packaging Details: Export-worthy seaworthy wooden boxes, cartons, or gunny bags Proper coating/oiling to prevent rust during transportation Marking includes size, grade, heat number, and manufacturer details for traceability