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Hastelloy G35 Washers Manufacturer & Exporter in India

Explore Hastelloy G35 Washers Manufacturer & Exporter in India manufactured for demanding industrial applications with reliable strength, corrosion resistance and compliance with international standards.
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-200

Min Temp

1100

Max Temp

🌡

1100

Suitable for continuous service up to approximately 1100°C under typical operating conditions.

⚡

800

Typical tensile strength around 800 MPa depending on product form and heat treatment.

🛡

Excellent

Excellent corrosion resistance in a wide range of industrial environments.

⚖

8.9

Typical density is approximately 8.9 g/cm³.

Product Overview

What are Hastelloy G35 Washers?

Hastelloy G35 washers are nickel-chromium-molybdenum alloy fastener components manufactured from UNS N06035 bar or plate stock conforming to ASTM B574 and ASTM B575. The alloy’s high chromium content (33.2-36.2%) combined with molybdenum (7.6-9.0%) delivers outstanding resistance to oxidising acids, mixed acid environments, and wet process phosphoric acid – performance that no standard austenitic stainless steel can replicate.

The elevated chromium level gives Hastelloy G35 a PREN exceeding 55, providing exceptional resistance to pitting and crevice corrosion in chloride-bearing process streams. Hastelloy G35 washers are specified for chemical process flanges, phosphoric acid plant equipment, and FGD scrubber assemblies where standard nickel alloys and stainless steels suffer accelerated corrosion under washer bearing surfaces.

Quick Specifications

MaterialHastelloy G35
UNS NumberN06035
DIN Number2.4643
Material StandardASTM B574 / ASTM B575
Washer Standard (Metric)DIN 125 / DIN 9021 / ISO 7089
Washer Standard (Inch)ASME B18.22.1 / ASME B18.21.1
Diameter RangeM6-M100 / ¼"-4"
Tensile Strength690 MPa (100 ksi) min
Yield Strength310 MPa (45 ksi) min
HardnessMax 35 HRC / 241 HB
Elongation40% min
? All material certified by NABL-accredited laboratory. PMI available on request.

Complete the Fastener Set

Other Hastelloy G35 Fastener Products Available from RealBolt

RealBolt also manufactures the complete Hastelloy G35 fastener range from certified nickel-molybdenum-chromium superalloy bar stock, including Hastelloy G35 Bolts, Hastelloy G35 Nuts, Hastelloy G35 Screws, Hastelloy G35 Studs, and Hastelloy G35 Threaded Rods. All Hastelloy G35 fastener types are produced to ASTM with full EN 10204 MTC 3.1/3.2 documentation.
Hastelloy G35 Bolts
Hastelloy G35 Nuts
Hastelloy G35 Screws
Hastelloy G35 Studs
Hastelloy G35 Threaded Rods

Technical Data

Hastelloy G35 Washers Dimensions, Sizes & Thread Standards

Hastelloy G35 Washers are available in metric M6–M100 and inch ¼″–4″ as standard. Per DIN 125 (flat washers) / DIN 9021 (large OD washers) / ISO 7089. Custom OD and thickness available. Inch dimensions per ASME B18.22.1. All Hastelloy G35 washers dimensions are verified against applicable DIN, ISO, and ASME

Flat Washer Dimensions - Metric (DIN 125 / ISO 7089)

Bolt Size (M)ID (mm)OD (mm)Thickness (mm)Large OD DIN 9021 (mm)
M66.4121.618
M88.4161.624
M1010.5202.030
M1213.0242.537
M1617.0303.050
M2021.0373.060
M2425.0444.072
M3031.0564.092
M3637.0665.0110
M4243.0787.0130
M4850.0928.0150
M5658.01059.0175
M6466.01159.0200
M7274.012510.0220
M8082.014012.0250
M100104.017514.0310

Dimensional & Material Standards

StandardCoversType
DIN 125Flat washers, normal seriesMetric
DIN 9021Flat washers, large OD seriesMetric
ISO 7089Plain washers, normal seriesMetric
ISO 7093Plain washers, large seriesMetric
ASME B18.22.1Plain washers, inch seriesUNC/UNF
ASME B18.21.1Lock washers, inch seriesUNC/UNF
Material StandardRequirement
ASTM B574Bar/rod - UNS N06035
ASTM B575Plate/sheet - UNS N06035
NACE MR0175Sour service =35 HRC
EN 10204 3.1Mill test certificate
EN 10204 3.2TPI-witnessed MTC

Material Chemistry

Hastelloy G35 Chemical Composition

Hastelloy G35 Washers derive their exceptional acid corrosion resistance from a precisely controlled nickel-molybdenum-chromium composition per ASTM. High molybdenum and tungsten content suppresses pitting and reducing-acid attack; ultra-low carbon (0.01% max) eliminates sensitization risk in welded assemblies. Full elemental composition is certified in the EN 10204 MTC supplied with every Hastelloy G35 washers order from RealBolt.

Chemical Composition per ASTM B574 / ASTM B575

ElementComposition (%)
Nickel (Ni)Balance (approx. 47% min)
Chromium (Cr)33.2-36.2%
Molybdenum (Mo)7.6-9.0%
Iron (Fe)1.0% max
Carbon (C)0.05% max
Manganese (Mn)1.0% max
Silicon (Si)0.6% max
Cobalt (Co)1.0% max
Tungsten (W)0.05% max
Phosphorus (P)0.04% max
Sulfur (S)0.03% max
? All heats verified by NABL-accredited spectrometry. PMI available on request.

Why Hastelloy G35 Alloy Composition Matters for Washers

Cr (33.2–36.2%) — Oxidising Acid Resistance
The exceptionally high chromium content of Hastelloy G35 provides outstanding resistance to oxidising acids including nitric acid, mixed acids, and wet process phosphoric acid — environments where standard nickel alloys such as Hastelloy C276 suffer accelerated attack. This makes G35 washers the preferred choice for chemical process flanges handling oxidising media.
Mo (7.6–9.0%) — Pitting and Crevice Corrosion Resistance
Molybdenum in combination with the high chromium content delivers a PREN exceeding 55, providing superior resistance to pitting and crevice corrosion under washer bearing surfaces in chloride-containing process streams. This is critical in applications where stagnant liquid can accumulate beneath the washer face.
Low Carbon (0.05% max) — Sensitisation Prevention
The controlled low carbon content prevents carbide precipitation at grain boundaries during welding or elevated temperature service, ensuring Hastelloy G35 washers retain full corrosion resistance in heat-affected zones without requiring post-weld heat treatment.

Fastener Performance

Hastelloy G35 Washers Mechanical Properties & Hardness Reference

The table below lists mechanical properties and hardness reference for Hastelloy G35 Washers per ASTM. Hastelloy G35 washers achieve 800 MPa tensile strength, with hardness, yield, and elongation values verified by NABL-accredited testing and reported in the EN 10204 MTC.

Washer Bearing Stress & Load Reference

Bolt SizeWasher OD (mm)Washer ID (mm)Thickness (mm)Max Bearing Load (kN)
M122413.02.528
M163017.03.052
M203721.03.085
M244425.04.0130
M305631.04.0210
M366637.05.0310
M427843.07.0430
M489250.08.0580
?? Anti-galling note: Use nickel-based anti-seize on mating bolt threads. Never use copper-based compounds on nickel alloy fastener assemblies. Bearing load values are indicative at room temperature.

Industry Applications

Hastelloy G35 Washers Applications — Industries & End Uses

Hastelloy G35 Washers from RealBolt are specified across chemical processing, pharmaceutical, oil and gas, and FGD where excellent corrosion resistance and 800 MPa tensile strength are required for reliable fastener performance. Click each industry below for detailed application examples. Select an industry below to see specific Hastelloy G35 washers application details and RealBolt stock availability.
Hastelloy G35 washers are the preferred specification for flange bolt assemblies in phosphoric acid, nitric acid, and mixed acid process plants. The high chromium content (33.2-36.2%) provides corrosion resistance in oxidising environments where Hastelloy C276 and standard nickel alloys are inadequate. Used under stud bolt heads and nuts on reactor flanges, heat exchanger covers, and pipe connections handling wet process phosphoric acid (WPA).
Flat and large OD washers for flue gas desulphurisation (FGD) scrubber internal connections, absorber tower flange assemblies, and ductwork connections where HCl-saturated gas, sulfuric acid mist, and chloride-bearing condensate combine to attack standard stainless steel and even Hastelloy C276 washers at elevated temperatures.
Hastelloy G35 washers are specified for flange connections in chlorine dioxide bleaching stages, hypochlorite bleach plant piping, and washer press assemblies where oxidising bleach chemicals and elevated temperatures create highly corrosive conditions that rapidly degrade 316L and duplex stainless steel fastener components.
Washer sets for reactor closure flanges, agitator shaft seals, and heat exchanger nozzle connections in pharmaceutical API manufacturing and fine chemical synthesis where mixed acid media, halide-containing solvents, and strict contamination control requirements demand high-purity, corrosion-resistant nickel alloy fastener components.

Hastelloy G35 Washers Standards & International Certifications

Hastelloy G35 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 3.1/3.2, PMI (XRF), NACE MR0175/ISO 15156, and NABL-accredited lab 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
Certifications
ISO 9001:2015NACE MR0175NABL LabPED 2014/68/EUMTC 3.1 / 3.2

Buy Hastelloy G35 Washers from India's Leading Manufacturer — Get a Competitive Quote Today

Partner with RealBolt — India’s leading manufacturer of certified Hastelloy G35 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.
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Answers for Buyers

Hastelloy G35 Washers — Frequently Asked Questions

Browse expert answers to common questions about Hastelloy G35 Washers from RealBolt — covering acid corrosion resistance, NACE MR0175 compliance, ASTM standards, available sizes, and MTC documentation. Contact our technical team directly for project-specific guidance on Hastelloy G35 washers selection and pricing.
Hastelloy G35 flat washers are manufactured to DIN 125 (metric normal series), DIN 9021 (metric large OD series), ISO 7089, and ISO 7093. Inch series washers are available per ASME B18.22.1 (plain washers) and ASME B18.21.1 (lock washers). Custom dimensions including non-standard OD, ID, and thickness are available with a 10-15 working day lead time. All washers are supplied with EN 10204 3.1 mill test certificates as standard.
Hastelloy G35 (UNS N06035) contains significantly higher chromium (33.2-36.2%) compared to Hastelloy C276 (UNS N10276, Cr 14.5-16.5%). This makes G35 superior in oxidising acid environments such as nitric acid, mixed acids, and wet process phosphoric acid, where C276 can suffer accelerated corrosion. Hastelloy C276 outperforms G35 in strongly reducing acid environments. For mixed oxidising and reducing service, G35 is generally the preferred choice. Consult our engineering team for specific media compatibility assessment.
Yes – Hastelloy G35 washers in the annealed condition with hardness not exceeding 35 HRC comply with NACE MR0175 / ISO 15156 requirements for sour service environments containing H2S. Each washer batch is supplied with a hardness survey report confirming compliance. For critical sour service flange assemblies, we recommend specifying the complete fastener set (stud bolts, nuts, and washers) from a single matched heat to ensure consistent material certification and traceability.
No formal MOQ applies to standard metric sizes (M12-M36) held ex-stock – we supply from single pieces for emergency maintenance and shutdown requirements. Custom sizes and non-standard dimensions carry a minimum order of 5 kg. Large OD DIN 9021 series washers in sizes M16-M48 are also available ex-stock. Quantity price breaks apply at 100 pieces, 500 pieces, and 1,000 pieces for standard sizes.

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