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Hastelloy G35 Bolts Manufacturer & Exporter in India

Explore Hastelloy G35 Bolts 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 Bolts?

Hastelloy G35 bolts 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 concentrated nitric acid and mixed acid environments, at a minimum tensile strength of 690 MPa in the annealed condition.

The elevated chromium level gives Hastelloy G35 a PREN exceeding 48, providing outstanding resistance to pitting and crevice corrosion in aggressive oxidising chloride media. Hastelloy G35 bolts are specified for phosphoric acid plants, nitric acid reactors, and chemical process equipment where standard nickel alloys and stainless steels fail prematurely under oxidising conditions.

Quick Specifications

MaterialHastelloy G35
UNS NumberN06035
DIN Number2.4643
Material StandardASTM B574
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 Strength690 MPa (100 ksi) min
Yield Strength310 MPa (45 ksi) min
HardnessMax 35 HRC / 220 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 Nuts, 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 Nuts
Hastelloy G35 Screws
Hastelloy G35 Washers
Hastelloy G35 Studs
Hastelloy G35 Threaded Rods

Technical Data

Hastelloy G35 Bolts Dimensions, Sizes & Thread Standards

Hastelloy G35 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 Hastelloy G35 bolts dimensions are verified against applicable DIN, ISO, and ASME

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 B574Bar/rod - UNS N06035
ASTM F468Fastener 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 Bolts 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 bolts 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)1.0% max
Carbon (C)0.05% max
Manganese (Mn)1.0% max
Silicon (Si)0.70% 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 Bolts

Cr (33.2–36.2%) — Oxidising Acid Resistance
The exceptionally high chromium content is the defining characteristic of Hastelloy G35. It forms a highly stable passive oxide film that resists attack in concentrated nitric acid, mixed nitric/hydrofluoric acid, and other strongly oxidising environments where lower-chromium nickel alloys corrode rapidly.
Mo (7.6–9.0%) — Pitting & Crevice Resistance
Molybdenum reinforces resistance to localised corrosion, particularly under bolt head bearing surfaces and in crevices formed at gasketed flange joints. This is critical in mixed acid service where both oxidising and reducing conditions may alternate during process cycles.
Ultra-Low Carbon (0.05% max) — Sensitisation Prevention
The controlled low carbon content prevents chromium carbide precipitation at grain boundaries during welding or elevated-temperature service. Hastelloy G35 bolts retain full intergranular corrosion resistance in the as-welded condition without requiring post-weld heat treatment.

Fastener Performance

Hastelloy G35 Bolts Mechanical Properties & Torque Reference

The table below lists mechanical properties and torque reference for Hastelloy G35 Bolts per ASTM. Hastelloy G35 bolts 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 Bolts

Bolt SizeDry (Nm)Lubricated (Nm)Clamp Load (kN)
M12756028
M1618014467
M20360288108
M24620496155
M301240992248
M3621601728360
M4234402752495
M4851004080650
?? 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 Bolts Applications — Industries & End Uses

Hastelloy G35 Bolts 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 bolts application details and RealBolt stock availability.
Hastelloy G35 hex bolts and stud bolt sets are the preferred specification for reactor vessel closures, column flange connections, and heat exchanger covers in nitric acid, mixed nitric/hydrofluoric acid, and phosphoric acid plants. The alloy’s 33-36% chromium content provides corrosion rates below 0.1 mm/year in boiling concentrated HNO3 – performance unmatched by any standard stainless steel or lower-chromium nickel alloy.
Flange bolt sets for phosphoric acid evaporators, ammonium nitrate reactor flanges, and urea plant pressure vessel nozzle connections. Hastelloy G35 bolts resist the combined attack of phosphoric acid, fluoride ions, and oxidising conditions present throughout wet-process phosphoric acid production, where 316L and even 904L stainless steels suffer rapid intergranular attack.
Stud bolts and hex bolts for chlorine dioxide bleaching tower flanges, hypochlorite stage pipe connections, and bleach plant heat exchanger covers. The high chromium and molybdenum combination resists the oxidising halide environment of modern ECF and TCF bleaching sequences at temperatures up to 90°C.
Hastelloy G35 bolts are specified for spent nuclear fuel reprocessing equipment, nitric acid dissolution vessel closures, and radioactive liquid storage tank nozzle flanges. The alloy’s resistance to concentrated HNO3 at elevated temperatures and its low corrosion product release rate make it suitable for environments where contamination control is critical.

Hastelloy G35 Bolts Standards & International Certifications

Hastelloy G35 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 3.1/3.2, PMI (XRF), NACE MR0175/ISO 15156, and NABL-accredited lab reports — available on request for all orders.
Standards
DIN 931 DIN 933 ISO 4014 ISO 4017 ASME B18.2.1 IS 1364 IS 1367
Certifications
ISO 9001:2015NACE MR0175NABL LabPED 2014/68/EUMTC 3.1 / 3.2

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

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

Hastelloy G35 Bolts — Frequently Asked Questions

Browse expert answers to common questions about Hastelloy G35 Bolts 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 bolts selection and pricing.
Hastelloy G35 hex bolts are manufactured to DIN 931 (metric partial thread), DIN 933 (metric full thread), ISO 4014/4017, and ASME B18.2.1 for inch hex and heavy hex configurations. Stud bolts for flange applications are produced per ASME B16.5 and MSS SP-75. Non-standard thread forms including BSW, BSF, and BSPP are available on request with a typical lead time of 15 working days. All dimensions are verified against calibrated gauges traceable to national standards.
Hastelloy G35 contains 33.2-36.2% chromium compared to approximately 14.5-16.5% in Hastelloy C276. In strongly oxidising environments such as concentrated nitric acid, high chromium content is the dominant factor controlling corrosion resistance. C276’s higher molybdenum content provides superior performance in reducing acid environments, but in oxidising HNO3 service, G35 outperforms C276 by a significant margin – often showing corrosion rates 5-10 times lower. For mixed acid or alternating oxidising/reducing service, consult our engineering team for alloy selection guidance.
Yes – Hastelloy G35 is one of the most widely specified alloys for wet-process phosphoric acid production. The combination of high chromium and molybdenum provides resistance to the complex mixture of phosphoric acid, hydrofluoric acid, sulphuric acid, and fluorosilicic acid present in evaporator and clarifier circuits. Hastelloy G35 bolts are used on evaporator flange connections, pump casing joints, and heat exchanger covers where 316L, 904L, and even 2205 duplex stainless steels suffer unacceptable corrosion rates.
In oxidising atmospheres, Hastelloy G35 maintains good oxidation resistance up to approximately 1040°C due to its high chromium content forming a stable Cr2O3 scale. For bolted flange applications in process service, the practical upper temperature limit is governed by the flange rating and gasket material rather than the bolt alloy. In continuous elevated-temperature service above 650°C, creep relaxation should be considered in bolt load calculations. Contact our engineering team for high-temperature torque retention data and re-torquing recommendations.

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