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Super Duplex 2507 Bolts Manufacturer & Exporter in India

Explore Super Duplex 2507 Bolts Manufacturer & Exporter in India manufactured for demanding industrial applications with reliable strength, corrosion resistance and compliance with international standards.
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-50

Min Temp

300

Max Temp

🌡

300

Suitable for continuous service up to approximately 300°C under typical operating conditions.

⚡

850

Typical tensile strength around 850 MPa depending on product form and heat treatment.

🛡

Excellent

Excellent corrosion resistance in a wide range of industrial environments.

⚖

7.8

Typical density is approximately 7.8 g/cm³.

Product Overview

What are Super Duplex 2507 Bolts?

Super Duplex 2507 bolts are high-performance fasteners manufactured from UNS S32750 or S32760 super duplex stainless steel bar, conforming to ASTM A479/A182. These bolts combine austenitic and ferritic microstructures, delivering exceptional strength (min 800 MPa tensile) and a PREN = 41 for outstanding resistance to pitting, crevice, and stress corrosion cracking in aggressive chloride environments.

Super Duplex 2507 bolts are the industry standard for critical bolted joints in offshore, desalination, and chemical processing applications where conventional stainless steels fail. All bolts are supplied with full traceability and EN 10204 3.1/3.2 certification for demanding project specifications.

Quick Specifications

MaterialSuper Duplex 2507
UNS NumberS32750 / S32760
DIN Number1.4410
Material StandardASTM A479 / ASTM A182
Bolt Standard (Metric)DIN 931 / DIN 933 / ISO 4014
Bolt Standard (Inch)ASME B18.2.1
Thread FormISO Metric / UNC / UNF
Diameter RangeM6-M100 / ¼"-4"
Tensile Strength800 MPa (116 ksi) min
Yield Strength550 MPa (80 ksi) min
HardnessMax 32 HRC / 300 HB
? All material certified by NABL-accredited laboratory. PMI and ferrite testing available on request.

Complete the Fastener Set

Other Super Duplex 2507 Fastener Products Available from RealBolt

RealBolt also manufactures the complete Super Duplex 2507 fastener range from certified super duplex stainless steel bar stock, including Super Duplex 2507 Nuts, Super Duplex 2507 Screws, Super Duplex 2507 Washers, Super Duplex 2507 Studs, and Super Duplex 2507 Threaded Rods. All Super Duplex 2507 fastener types are produced to ASTM with full EN 10204 MTC 3.1/3.2 documentation.
Super Duplex 2507 Nuts
Super Duplex 2507 Screws
Super Duplex 2507 Washers
Super Duplex 2507 Studs
Super Duplex 2507 Threaded Rods

Technical Data

Super Duplex 2507 Bolts Dimensions, Sizes & Thread Standards

Super Duplex 2507 Bolts are available in metric M6–M100 and inch ¼″–4″ as standard. Per DIN 931 (partial thread) / DIN 933 (full thread) / ISO 4014. Custom lengths in 5mm increments. Inch dimensions available per ASME B18.2.1. All Super Duplex 2507 bolts dimensions conform to applicable DIN, ISO, and ASME B18 standards.

Hex Bolt Dimensions - Metric (DIN 931 / ISO 4014)

Size (M)Pitch (mm)A/F (mm)Head Ht (mm)Min L (mm)Max L (mm)
M61.0104.010200
M81.25135.312250
M101.5176.416300
M121.75197.520400
M162.02410.025500
M202.53012.530600
M243.03615.040600
M303.54618.750800
M364.05522.5601000
M424.56526.0801000
M485.07530.01001200
M565.58535.01201500
M646.09540.01402000
M726.010545.01602000
M806.011550.01802500
M1006.014563.02003000

Dimensional & Material Standards

StandardCoversThread
DIN 931Hex bolts, partial threadMetric
DIN 933Hex bolts, full threadMetric
ISO 4014Hex head screws, partialMetric
ISO 4017Hex head screws, fullMetric
ASME B18.2.1Hex & heavy hex boltsUNC/UNF
ASME B16.5Stud bolts for flangesUNC
MSS SP-75Stud bolts, high-pressureUNC
Material StandardRequirement
ASTM A479Bar/rod - UNS S32750/S32760
ASTM A182Forged fasteners
NACE MR0175Sour service =32 HRC
EN 10204 3.1Mill test certificate
EN 10204 3.2TPI-witnessed MTC

Material Chemistry

Super Duplex 2507 Chemical Composition

Super Duplex 2507 Bolts are manufactured from a high-alloy ferritic-austenitic steel containing chromium (24–26%), molybdenum (3.5–5%), and nitrogen (0.24–0.32%) per ASTM. These precise elemental limits produce PREN ≥ 40 — confirming seawater pitting immunity — and deliver the 550 MPa minimum yield strength required for NORSOK M-630 subsea qualification.

Chemical Composition per ASTM A479 / ASTM A182

ElementComposition (%)
Chromium (Cr)24.0-26.0
Nickel (Ni)6.0-8.0
Molybdenum (Mo)3.0-5.0
Nitrogen (N)0.24-0.32
Manganese (Mn)1.2 max
Silicon (Si)0.8 max
Carbon (C)0.030 max
Phosphorus (P)0.035 max
Sulphur (S)0.020 max
Iron (Fe)Balance
? All heats verified by NABL-accredited spectrometry. PMI and ferrite content testing available on request.

Why Super Duplex 2507 Alloy Composition Matters for Bolts

High Cr, Mo, N — Pitting & Crevice Resistance
The high chromium, molybdenum, and nitrogen content gives Super Duplex 2507 bolts a PREN = 41, ensuring outstanding resistance to pitting and crevice corrosion in seawater, brine, and chloride-rich process streams.
Balanced Duplex Structure — Stress Corrosion Cracking Resistance
The dual-phase (austenite/ferrite) microstructure provides immunity to chloride stress corrosion cracking, a common failure mode for standard stainless steel bolts in marine and chemical plant service.
Low Carbon — Weldability
Low carbon and controlled nitrogen levels allow Super Duplex 2507 bolts to be welded with minimal risk of intergranular corrosion or loss of mechanical properties, making them ideal for critical flange and structural connections.

Fastener Performance

Super Duplex 2507 Bolts Mechanical Properties & Torque Reference

The table below lists mechanical properties and torque reference for Super Duplex 2507 Bolts per ASTM. Super Duplex 2507 bolts achieve 850 MPa tensile strength, with hardness, yield, and elongation values verified by NABL-accredited testing and reported in the EN 10204 MTC.

Bolt SizeDry (Nm)Lubricated (Nm)Clamp Load (kN)
M121108838
M1626020892
M20520416148
M24900720215
M3018001440340
M3631002480495
M4249503960680
M4873505880900
?? Anti-galling: Use molybdenum-based or PTFE anti-seize. Lubricated values assume K=0.15. Avoid stainless steel-on-stainless steel galling by using matched nuts.

Industry Applications

Super Duplex 2507 Bolts Applications — Industries & End Uses

Super Duplex 2507 Bolts from RealBolt are specified across subsea oil and gas, FPSOs, desalination, and offshore where excellent corrosion resistance and 850 MPa tensile strength are required for reliable fastener performance. Click each industry below for detailed application examples.
Super Duplex 2507 stud bolts and nuts are specified for ASME B16.5/B16.47 flanged connections, subsea manifolds, riser systems, and topside piping in offshore platforms. Fully compliant with NORSOK M-650 and NACE MR0175 for sour service and seawater exposure.
Hex bolts and flange bolts for high-pressure reverse osmosis (RO) vessels, seawater intake structures, and evaporator brine circuits where high chloride resistance and mechanical strength are critical for long-term reliability.
Flange stud bolt sets for heat exchangers, pressure vessel nozzles, and reactor closures in hydrochloric acid, caustic, and mixed chloride process streams where 316L and 904L fail due to pitting or stress corrosion cracking.
Super Duplex 2507 bolts are used in phosphoric acid plants, flotation cells, and fertilizer reactors where abrasive slurries and aggressive chemicals demand both high strength and superior corrosion resistance.

Super Duplex 2507 Bolts Standards & International Certifications

Super Duplex 2507 Bolts from RealBolt Engineering Industries are manufactured to internationally recognised fastener dimensional standards covering thread form, tolerances, strength grades, and quality requirements. Every batch ships with EN 10204 MTC 3.2 (third-party), NACE MR0175/ISO 15156, NORSOK M-630, Charpy impact certificates, and PMI (XRF) reports — available on request for all orders.
Standards
DIN 931 DIN 933 ISO 4014 ISO 4017 ASME B18.2.1 EN ISO 4014 EN ISO 4017 IS 1364 IS 1367 IS 12427
Certifications
ISO 9001:2015NACE MR0175NABL LabPED 2014/68/EUMTC 3.1 / 3.2

Buy Super Duplex 2507 Bolts from India's Leading Manufacturer — Get a Competitive Quote Today

Partner with RealBolt — India’s leading manufacturer of certified Super Duplex 2507 Bolts — for competitive pricing, EN 10204 MTC 3.1/3.2 documentation, and fast Mumbai dispatch. Standard sizes are ex-stock; custom dimensions accepted with 2–3 week lead time. Request your quote today.
022-6743-7972
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Answers for Buyers

Super Duplex 2507 Bolts — Frequently Asked Questions

Browse expert answers to common questions about Super Duplex 2507 Bolts from RealBolt — covering PREN ≥ 40, NORSOK M-630, NACE MR0175, ASTM A182 F53/F55, sizes, and EN 10204 3.2 third-party documentation. Contact our technical team directly for project-specific guidance on Super Duplex 2507 bolts selection and pricing.
Super Duplex 2507 hex bolts are available to DIN 931 (metric partial thread), DIN 933 (metric full thread), ISO 4014/4017, and ASME B18.2.1 (inch hex and heavy hex). Stud bolts are supplied per ASME B16.5 or MSS SP-75 for flange applications. Custom thread forms (BSW, BSF, Whitworth, BSPP) can be manufactured on request with a typical 15 working day lead time.
Use molybdenum-based or PTFE anti-seize compound (such as Molykote 1000 or Loctite LB 8014). Apply to threads and nut bearing face to prevent galling. Reduce torque values by 20% for lubricated assembly. Do not use copper-based anti-seize in chloride-rich or seawater environments to avoid galvanic corrosion.
Yes – Super Duplex 2507 bolts have a PREN = 41 and are highly resistant to pitting, crevice, and stress corrosion cracking in seawater, brine, and high-chloride process streams. They are specified in NORSOK M-650 and Shell DEP for offshore and desalination plant fasteners. No special coating or cathodic protection is required.
No formal MOQ for standard sizes (M12-M36) held ex-stock – we supply from single pieces for urgent maintenance. Custom sizes have an MOQ of 10 kg minimum. ASME B16.5 flange stud bolt sets are supplied by the set with no minimum. Quantity price breaks at 50 pcs, 200 pcs, and 500 pcs.

Industrial Cities We Serve:

  • Ahmedabad
  • Aurangabad
  • Bengaluru
  • Chennai
  • Coimbatore
  • Faridabad
  • Gandhidham
  • Greater Noida
  • Gurugram
  • Hazira
  • Hosur
  • Hyderabad
  • Jamnagar
  • Jamshedpur
  • Ludhiana
  • Mumbai
  • Mundra
  • Mysuru
  • Nagpur
  • Nashik
  • Navi Mumbai
  • Noida
  • Pune
  • Rajkot
  • Sanand
  • Surat
  • Thane
  • Tiruppur
  • Vadodara
  • Visakhapatnam

Countries We Export To:

  • US
  • Canada
  • Mexico
  • Germany
  • UK
  • France
  • Italy
  • Spain
  • Netherlands
  • Belgium
  • Poland
  • Sweden
  • Norway
  • Denmark
  • Turkey
  • UAE
  • Saudi Arabia
  • Qatar
  • Oman
  • Kuwait
  • Bahrain
  • South Africa
  • Egypt
  • Nigeria
  • Australia
  • New Zealand
  • Singapore
  • Malaysia
  • Indonesia
  • Thailand
  • Vietnam
  • South Korea
  • Japan
  • Brazil