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Hastelloy G35 Studs Manufacturer & Exporter in India

Explore Hastelloy G35 Studs 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 Studs?

Hastelloy G35 studs are nickel-chromium-molybdenum alloy fasteners manufactured from UNS N06035 bar stock conforming to ASTM B574. The alloy’s exceptional resistance to oxidizing acids is achieved through an elevated chromium content of 33.2-36.2%, combined with molybdenum (7.6-9.0%) and tungsten additions that collectively suppress both uniform and localized corrosion in highly aggressive chemical environments.

With a PREN exceeding 55, Hastelloy G35 studs outperform standard nickel alloys in nitric acid, mixed acid, and phosphoric acid service. These studs are specified for chemical reactor closures, heat exchanger nozzle connections, and flue gas scrubber assemblies where conventional stainless steel and even Hastelloy C276 fall short under strongly oxidizing conditions.

Quick Specifications

MaterialHastelloy G35
UNS NumberN06035
DIN Number2.4643
Material StandardASTM B574
Stud Standard (Metric)DIN 938 / DIN 939 / ISO 4032
Stud Standard (Inch)ASME B18.31.2 / ASME B16.5
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 / 241 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 Nuts, Hastelloy G35 Screws, Hastelloy G35 Washers, 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 Washers
Hastelloy G35 Threaded Rods

Technical Data

Hastelloy G35 Studs Dimensions, Sizes & Thread Standards

Hastelloy G35 Studs are available in metric M6–M100 and inch ¼″–4″ as standard. Per DIN 938 (type A stud) / DIN 939 (type B stud) / ASME B18.31.2. Custom lengths in 5mm increments. Inch dimensions available per ASME B16.5 for flange stud bolt sets.

Stud Bolt Dimensions - Metric (DIN 938 / DIN 939)

Size (M)Pitch (mm)Shank Dia (mm)End Length (mm)Min L (mm)Max L (mm)
M61.06.0620200
M81.258.0825250
M101.510.01030300
M121.7512.01235400
M162.016.01645500
M202.520.02055600
M243.024.02465700
M303.530.03080900
M364.036.0361001000
M424.542.0421201200
M485.048.0481401500
M565.556.0561601800
M646.064.0641802000
M726.072.0722002200
M806.080.0802202500
M1006.0100.01002503000

Dimensional & Material Standards

StandardCoversThread
DIN 938Studs, metal-end engagement 1dMetric
DIN 939Studs, metal-end engagement 1.25dMetric
ISO 4032Hex nuts, style 1Metric
ASME B18.31.2Continuous thread studsUNC/UNF
ASME B16.5Stud bolts for pipe flangesUNC
MSS SP-75High-pressure stud boltsUNC
ASME B16.47Large diameter flange studsUNC
Material StandardRequirement
ASTM B574Bar/rod - UNS N06035
ASTM B462Forgings - UNS N06035
ASTM F467Fastener nuts, nickel alloy
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 Studs 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 studs 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
Tungsten (W)0.6% max
Carbon (C)0.05% max
Manganese (Mn)0.50% max
Silicon (Si)0.30% max
Cobalt (Co)1.0% 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 Studs

Cr (33.2–36.2%) — Oxidizing Acid Resistance
The exceptionally high chromium content in Hastelloy G35 is the defining feature of this alloy. It provides outstanding resistance to nitric acid across a wide concentration and temperature range, far exceeding the performance of Hastelloy C276 or standard austenitic stainless steels in oxidizing environments.
Mo (7.6–9.0%) — Pitting and Crevice Corrosion Control
Molybdenum works in concert with chromium to suppress pitting and crevice corrosion in mixed acid and halide-containing process streams. For stud applications, this is critical at thread roots and under nut bearing faces where crevice geometry concentrates aggressive media.
Low Carbon (0.05% max) — Sensitization Resistance
The controlled low carbon content prevents chromium carbide precipitation at grain boundaries during welding or elevated-temperature service. Hastelloy G35 studs retain full corrosion resistance in the heat-affected zone without requiring post-weld heat treatment, simplifying fabrication of flanged assemblies.

Fastener Performance

Hastelloy G35 Studs Mechanical Properties & Torque Reference

The table below lists mechanical properties and torque reference for Hastelloy G35 Studs per ASTM. Hastelloy G35 studs 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 Studs

Stud SizeDry (Nm)Lubricated (Nm)Clamp Load (kN)
M12725827
M1617514065
M20345276104
M24600480151
M301200960240
M3621001680349
M4233502680481
M4849803984632
?? 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 Studs Applications — Industries & End Uses

Hastelloy G35 Studs 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 studs application details and RealBolt stock availability.
Hastelloy G35 stud bolt sets are the preferred specification for reactor closure flanges, column nozzle connections, and heat exchanger channel covers in nitric acid, mixed nitric/sulfuric acid, and phosphoric acid service. The alloy’s high chromium content provides corrosion rates below 0.1 mm/year in boiling concentrated nitric acid where Hastelloy C276 fails rapidly.
Stud bolts for FGD absorber tower internals, spray header connections, and duct expansion joint flanges where saturated HCl-bearing flue gas at 50-80°C creates simultaneous oxidizing and chloride attack. Hastelloy G35 resists both attack mechanisms, eliminating the rapid corrosion failures seen with duplex stainless steel fasteners in this environment.
Flange stud sets for pharmaceutical-grade reactor vessels, distillation column nozzles, and crystallizer closures handling aggressive organic acids, oxidizing cleaning agents, and CIP/SIP sterilization cycles. The low iron content (1.0% max) and high chromium level meet the contamination control requirements of GMP-regulated production environments.
Stud bolts for chlorine dioxide bleaching tower flanges, washer drum connections, and bleach liquor heat exchanger nozzles. Hastelloy G35 resists the combined oxidizing and chloride environment of modern ECF and TCF bleach sequences where even super-duplex stainless steel fasteners suffer accelerated pitting and stress corrosion cracking.

Hastelloy G35 Studs Standards & International Certifications

Hastelloy G35 Studs 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 938 DIN 939 DIN 976-1 ASME B18.31.2 IS 1364 IS 1367
Certifications
ISO 9001:2015NACE MR0175NABL LabPED 2014/68/EUMTC 3.1 / 3.2

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

Partner with RealBolt — India’s leading manufacturer of certified Hastelloy G35 Studs — 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 Studs — Frequently Asked Questions

Browse expert answers to common questions about Hastelloy G35 Studs 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 studs selection and pricing.
Hastelloy G35 studs are manufactured to DIN 938 (metric, metal-end engagement 1d), DIN 939 (metric, metal-end engagement 1.25d), and ASME B18.31.2 for continuous thread studs in inch dimensions. Flange stud bolt sets for pipe flanges are produced per ASME B16.5 (Class 150 to Class 2500) and ASME B16.47 for large-diameter flanges. Custom thread forms including BSW, BSF, and BSPP are available on request with a 15 working day lead time.
Hastelloy G35 contains 33.2-36.2% chromium compared to approximately 15.5% in Hastelloy C276. In strongly oxidizing environments such as concentrated nitric acid, high chromium content is the dominant corrosion-resistance mechanism. Hastelloy C276’s high molybdenum content actually accelerates corrosion in oxidizing acids by forming soluble molybdenum oxides. Hastelloy G35 studs are therefore the correct specification for nitric acid, mixed acid, and oxidizing chemical service where C276 would fail prematurely.
Yes – Hastelloy G35 in the annealed condition meets the hardness requirement of 35 HRC maximum specified in NACE MR0175/ISO 15156 for nickel alloys in H2S sour service. All studs are supplied with hardness survey results on the MTC. For Class 900 and above flange stud sets in sour service, individual piece hardness testing is available on request to satisfy project-specific inspection and test plan requirements.
Standard metric sizes from M12 to M36 are held ex-stock in Mumbai with no formal minimum order quantity – single-piece supply is available for emergency maintenance and shutdown requirements. Custom sizes and non-standard lengths carry a minimum order of 10 kg. ASME B16.5 flange stud bolt sets are supplied by the complete set with no piece minimum. Volume price breaks apply at 50 pieces, 200 pieces, and 500 pieces for repeat orders.

Industrial Cities We Serve:

  • Ahmedabad
  • Aurangabad
  • Bengaluru
  • Chennai
  • Coimbatore
  • Faridabad
  • Gandhidham
  • Greater Noida
  • Gurugram
  • Hazira
  • Hosur
  • Hyderabad
  • Jamnagar
  • Jamshedpur
  • Ludhiana
  • Mumbai
  • Mundra
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  • Nagpur
  • Nashik
  • Navi Mumbai
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  • US
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