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Hastelloy G35 Nuts Manufacturer & Exporter in India

Explore Hastelloy G35 Nuts 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 Nuts?

Hastelloy G35 nuts are nickel-chromium-molybdenum alloy fasteners manufactured from UNS N06035 bar stock conforming to ASTM B574. The alloy’s high chromium content (33.2-36.2%) combined with molybdenum (7.6-9.0%) delivers exceptional resistance to oxidising acids, particularly nitric acid and mixed acid environments, at concentrations and temperatures that rapidly attack standard nickel alloys.

With a PREN exceeding 48 and outstanding resistance to intergranular corrosion in the as-welded condition, Hastelloy G35 nuts are specified for chemical process flanges, phosphoric acid plant connections, and nuclear fuel reprocessing assemblies where long-term joint integrity under aggressive oxidising conditions is non-negotiable.

Quick Specifications

MaterialHastelloy G35
UNS NumberN06035
DIN Number2.4643
Material StandardASTM B574
Nut Standard (Metric)DIN 934 / DIN 6915 / ISO 4032
Nut Standard (Inch)ASME B18.2.2
Thread FormISO Metric / UNC / UNF
Diameter RangeM6-M100 / ¼"-4"
Tensile Strength690 MPa (100 ksi) min
Yield Strength310 MPa (45 ksi) min
HardnessMax 35 HRC / 240 HB
? 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 Screws, Hastelloy G35 Washers, 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 Screws
Hastelloy G35 Washers
Hastelloy G35 Studs
Hastelloy G35 Threaded Rods

Technical Data

Hastelloy G35 Nuts Dimensions, Sizes & Thread Standards

Hastelloy G35 Nuts are available in metric M6–M100 and inch ¼″–4″ as standard. Per DIN 934 (hex nuts) / DIN 6915 (heavy hex nuts) / ISO 4032. Custom thread pitches available. Inch dimensions per ASME B18.2.2. All Hastelloy G35 nuts dimensions are verified against applicable DIN, ISO, and ASME B18

Hex Nut Dimensions - Metric (DIN 934 / ISO 4032)

Size (M)Pitch (mm)A/F (mm)Nut Height (mm)A/C (mm)Weight (g/pc approx)
M61.0105.011.053.5
M81.25136.514.387.5
M101.5178.018.9014
M121.751910.020.0322
M162.02413.026.7550
M202.53016.032.9595
M243.03619.039.55165
M303.54624.050.85340
M364.05529.060.79590
M424.56534.071.30950
M485.07538.082.601400
M565.58545.093.562200
M646.09551.0104.863200
M726.010558.0116.164500
M806.011564.0127.466000
M1006.014580.0160.0012000

Dimensional & Material Standards

StandardCoversThread
DIN 934Hex nuts, standard heightMetric
DIN 6915Heavy hex nuts, high-strengthMetric
ISO 4032Hex nuts, style 1Metric
ISO 4033Hex nuts, style 2 (tall)Metric
ASME B18.2.2Hex & heavy hex nutsUNC/UNF
ASME B16.5Heavy hex nuts for flangesUNC
MSS SP-75Heavy hex nuts, high-pressureUNC
Material StandardRequirement
ASTM B574Bar/rod - UNS N06035
ASTM F467Fastener mechanical properties
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 Nuts 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 nuts order from RealBolt.

Chemical Composition per ASTM B574

ElementComposition (%)
Nickel (Ni)Balance (approx. 47% min)
Chromium (Cr)33.2-36.2%
Molybdenum (Mo)7.6-9.0%
Iron (Fe)2.0% max
Carbon (C)0.05% max
Manganese (Mn)1.0% max
Silicon (Si)0.60% max
Cobalt (Co)1.0% max
Tungsten (W)0.50% max
Phosphorus (P)0.04% max
? All heats verified by NABL-accredited spectrometry. PMI available on request.

Why Hastelloy G35 Alloy Composition Matters for Nuts

Cr (33.2–36.2%) — Oxidising Acid Resistance
The exceptionally high chromium content is the defining characteristic of G35. It forms a tenacious passive oxide film that resists attack in concentrated nitric acid, mixed nitric-hydrofluoric acid, and chromic acid environments where lower-chromium nickel alloys fail rapidly.
Mo (7.6–9.0%) — Pitting & Reducing Acid Resistance
Molybdenum complements the chromium by providing resistance to pitting and crevice corrosion in chloride-containing process streams and reducing acid conditions. This dual protection makes G35 nuts suitable for mixed-acid process flanges where both oxidising and reducing species are present.
Low Carbon (0.05% max) — Sensitisation Immunity
The controlled low carbon content prevents chromium carbide precipitation at grain boundaries during welding or elevated-temperature service. Hastelloy G35 nuts retain full intergranular corrosion resistance in the as-welded condition without requiring post-weld heat treatment — a critical advantage for flanged assemblies that cannot be furnace-treated after fabrication.

Fastener Performance

Hastelloy G35 Nuts Mechanical Properties & Torque Reference

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

Tightening Torque Reference - Hastelloy G35 Nuts

Bolt/Stud SizeDry (Nm)Lubricated (Nm)Clamp Load (kN)
M12756028
M1618014468
M20360288108
M24620496156
M301240992248
M3621601728362
M4234502760498
M4851204096656
?? Anti-galling: Use nickel-based anti-seize (Molykote P-37 or equivalent). Lubricated values assume K=0.15. Never use copper-based anti-seize on nickel alloys - galvanic incompatibility accelerates thread corrosion.

Industry Applications

Hastelloy G35 Nuts Applications — Industries & End Uses

Hastelloy G35 Nuts 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 nuts application details and RealBolt stock availability.
Hastelloy G35 heavy hex nuts are the preferred specification for flange connections in concentrated nitric acid service, mixed nitric-hydrofluoric acid pickling lines, and chromic acid process vessels. The alloy’s PREN of 48+ and exceptional resistance to oxidising media make it the material of choice where stainless steel and standard nickel alloys suffer rapid attack. Compliant with ASME B31.3 process piping requirements.
G35 nuts are specified for flanged connections in PUREX-process reprocessing plants handling concentrated nitric acid at elevated temperatures. The alloy’s resistance to intergranular corrosion in the as-welded condition and its stability under gamma irradiation make it suitable for nuclear-grade fastener applications where long service intervals between maintenance shutdowns are required.
Hex nuts and heavy hex nuts for reactor vessel closures, heat exchanger channel covers, and pipeline flanges in wet-process phosphoric acid (WPA) plants. Hastelloy G35 outperforms alloy 625 and 276 in the highly oxidising, fluoride-containing phosphoric acid streams produced during rock phosphate digestion with sulfuric acid.
Nut sets for absorber tower internal flanges, spray header connections, and mist eliminator supports in limestone-forced-oxidation FGD scrubbers. The combination of high chloride concentrations, low pH, and oxidising conditions in FGD liquors demands the superior pitting resistance that Hastelloy G35 provides over duplex stainless and alloy C-276 in this specific environment.

Hastelloy G35 Nuts Standards & International Certifications

Hastelloy G35 Nuts 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 934 ISO 4032 ASME B18.2.2 IS 1364 IS 1367
Certifications
ISO 9001:2015NACE MR0175NABL LabPED 2014/68/EUMTC 3.1 / 3.2

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

Partner with RealBolt — India’s leading manufacturer of certified Hastelloy G35 Nuts — 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

Hastelloy G35 Nuts — Frequently Asked Questions

Browse expert answers to common questions about Hastelloy G35 Nuts 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 nuts selection and pricing.
Hastelloy G35 hex nuts are manufactured to DIN 934 (standard hex, metric), DIN 6915 (heavy hex, metric), ISO 4032 (style 1), ISO 4033 (style 2 tall), and ASME B18.2.2 (inch hex and heavy hex). Heavy hex nuts for ASME B16.5 flange stud bolt sets are supplied per ASME B18.2.2 heavy series. Custom configurations including coupling nuts, slotted nuts, and lock nuts are available on request with 15 working day lead time.
Yes – Hastelloy G35 is specifically engineered for concentrated and fuming nitric acid environments. The alloy’s chromium content of 33.2-36.2% provides a corrosion rate below 0.1 mm/year in boiling 65% nitric acid (Huey test per ASTM A262 Practice C), outperforming alloy 625, C-276, and all grades of stainless steel in this environment. G35 nuts are routinely specified for nitric acid plant flange connections operating at temperatures up to 120°C.
The key difference lies in oxidising versus reducing acid resistance. Hastelloy C-276 (UNS N10276) excels in reducing acids such as hydrochloric and dilute sulfuric acid due to its very high molybdenum content (15-17%). Hastelloy G35 (UNS N06035) is superior in oxidising environments – concentrated nitric acid, mixed acids, and chromic acid – because of its much higher chromium content (33.2-36.2%). For mixed-acid processes containing both oxidising and reducing species, G35 is generally the preferred choice. Consult our engineering team for site-specific media analysis.
Standard sizes (M12-M36 and ½”-1½”) held ex-stock carry no formal MOQ – single-piece supply is available for emergency maintenance requirements. Custom sizes and non-standard thread forms have a minimum of 10 kg per order. ASME B16.5 heavy hex nut sets are supplied by the complete flange set with no minimum quantity. Volume price breaks apply at 100 pieces, 500 pieces, and 1,000 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