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Super Duplex 2507 Washers Manufacturer & Exporter in India

Explore Super Duplex 2507 Washers 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 Washers?

Super Duplex 2507 washers are high-performance fastener components manufactured from UNS S32750 or S32760 super duplex stainless steel plate or bar, conforming to ASTM A240 or ASTM A182. These washers combine austenitic and ferritic microstructures, delivering exceptional mechanical strength (minimum 800 MPa tensile) and a PREN > 40 for outstanding resistance to pitting, crevice, and stress corrosion cracking in aggressive chloride environments.

Super Duplex 2507 washers are specified for critical flange joints, bolted assemblies, and pressure vessel closures in offshore, chemical, and desalination applications where standard 316L or duplex 2205 washers would fail due to corrosion or insufficient strength. All washers are supplied with full traceability and EN 10204 3.1 certification.

Quick Specifications

MaterialSuper Duplex 2507
UNS NumberS32750 / S32760
DIN Number1.4410
Material StandardASTM A240 / ASTM A182
Washer Standard (Metric)DIN 125 / DIN 127 / DIN 9021
Washer Standard (Inch)ASME B18.22.1
TypeFlat, Spring, Fender, Tab, Belleville
Diameter RangeM6-M100 / ¼"-4"
Tensile Strength800 MPa (116 ksi) min
Yield Strength550 MPa (80 ksi) min
HardnessMax 32 HRC / 300 HB
? All washers supplied with PMI and laboratory certification. EN 10204 3.1 included as standard.

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 Bolts, Super Duplex 2507 Nuts, Super Duplex 2507 Screws, 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 Bolts
Super Duplex 2507 Nuts
Super Duplex 2507 Screws
Super Duplex 2507 Studs
Super Duplex 2507 Threaded Rods

Technical Data

Super Duplex 2507 Washers Dimensions, Sizes & Thread Standards

Super Duplex 2507 Washers are available in metric M6–M100 and inch ¼″–4″ as standard. Per DIN 125 (flat), DIN 127 (spring), DIN 9021 (fender), and ASME B18.22.1. Custom OD/ID and thicknesses available. Metric and inch sizes supplied to order. All Super Duplex 2507 washers dimensions conform to applicable DIN, ISO, and ASME B18 standards.

Flat Washer Dimensions - Metric (DIN 125)

Size (M)Inner Dia (mm)Outer Dia (mm)Thickness (mm)
M66.4121.6
M88.4161.6
M1010.5202.0
M1213.0242.5
M1617.0303.0
M2021.0373.0
M2425.0444.0
M3031.0564.0
M3637.0665.0
M4243.0786.0
M4849.0926.0
M5657.01058.0
M6465.01158.0
M7273.013010.0
M8081.014010.0
M100101.018012.0

Dimensional & Material Standards

StandardCoversType
DIN 125Flat washersMetric
DIN 127Spring lock washersMetric
DIN 9021Fender washersMetric
ASME B18.22.1Plain & lock washersInch
ISO 7089Flat washersMetric
ISO 7090Chamfered washersMetric
Material StandardRequirement
ASTM A240Plate - UNS S32750/S32760
ASTM A182Forged bar - UNS S32750/S32760
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 Washers 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 A240 / 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 spectro-tested and PMI-verified. Full chemical traceability provided.

Why Super Duplex 2507 Alloy Composition Matters for Washers

PREN > 40 — Chloride Pitting Resistance
The high Cr, Mo, and N content gives Super Duplex 2507 washers a Pitting Resistance Equivalent Number (PREN) above 40, ensuring immunity to pitting and crevice corrosion in seawater and brine environments, even under high bolt loads.
Balanced Austenite-Ferrite Structure
The dual-phase microstructure prevents stress corrosion cracking and provides high mechanical strength, making these washers ideal for critical flange joints in aggressive process media.
Low Carbon, High Nitrogen
Low carbon and high nitrogen levels prevent intergranular corrosion and maintain toughness after welding, ensuring long-term reliability in bolted assemblies.

Fastener Performance

Super Duplex 2507 Washers Mechanical Properties & Torque Reference

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

Bolt SizeRecommended Washer OD (mm)Recommended Washer Thickness (mm)
M12242.5
M16303.0
M20373.0
M24444.0
M30564.0
M36665.0
M42786.0
M48926.0
?? Installation: Always use Super Duplex 2507 washers with matching alloy bolts/nuts to prevent galvanic corrosion. Ensure flat, burr-free surfaces for optimal load distribution.

Industry Applications

Super Duplex 2507 Washers Applications — Industries & End Uses

Super Duplex 2507 Washers 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 washers are specified for API 6A/ASME B16.5 flange joints, riser connections, and subsea manifold assemblies where high chloride, H2S, and CO2 exposure demand maximum pitting and crevice corrosion resistance. NORSOK M-650 and NACE MR0175 compliant.
Used in splash zone and submerged bolted joints on offshore platforms, FPSOs, and shipboard piping systems. Prevents crevice corrosion under bolt heads and nuts in seawater, outperforming 316L and 2205 washers.
Critical for bolted connections in reverse osmosis (RO) pressure vessels, evaporators, and brine recirculation systems where high salinity and temperature cycles cause rapid failure of standard stainless washers.
Washer sets for heat exchanger channel covers, reactor closures, and pressure vessel manways in aggressive acid, caustic, and chloride-rich process streams. Maintains integrity under high bolt loads and thermal cycling.

Super Duplex 2507 Washers Standards & International Certifications

Super Duplex 2507 Washers 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 125A DIN 126 DIN 127 DIN 128 ISO 7089 ISO 7090 ASME B18.21.1 EN ISO 7089 IS 5372 IS 1367 IS 12427
Certifications
ISO 9001:2015NACE MR0175NABL LabPED 2014/68/EUMTC 3.1 / 3.2

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

Partner with RealBolt — India’s leading manufacturer of certified Super Duplex 2507 Washers — 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 Washers — Frequently Asked Questions

Browse expert answers to common questions about Super Duplex 2507 Washers 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 washers selection and pricing.
Super Duplex 2507 washers are available to DIN 125 (flat), DIN 127 (spring), DIN 9021 (fender), ISO 7089/7090, and ASME B18.22.1 (inch). Custom OD, ID, and thicknesses are available on request. All washers are manufactured from ASTM A240 or A182 certified plate/bar and supplied with EN 10204 3.1 certification.
It is not recommended to use Super Duplex 2507 washers with carbon steel bolts due to the risk of galvanic corrosion. For maximum corrosion resistance, always use washers with matching super duplex bolts and nuts, especially in seawater or aggressive chemical environments.
Yes – Super Duplex 2507 washers are completely resistant to pitting and crevice corrosion in seawater, even under high bolt loads and in crevice-prone locations. They are specified for offshore, marine, and desalination plant applications where 316L and 2205 fail.
No MOQ for standard sizes (M8-M36) held in stock – we supply from single pieces for urgent maintenance. Custom sizes or profiles have a 10 kg minimum. Large quantity price breaks at 50, 200, and 500 pieces.

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