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Hastelloy C276 Studs Manufacturer & Exporter in India

Explore Hastelloy C276 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 C276 Studs?

Hastelloy C276 studs are nickel-molybdenum-chromium alloy fasteners machined from UNS N10276 bar stock conforming to ASTM B574. The alloy’s exceptional corrosion resistance stems from its high molybdenum content (15-17%) combined with tungsten (3-4.5%), which together suppress pitting, crevice corrosion, and stress corrosion cracking across a broad range of aggressive chemical environments.

With a PREN exceeding 70, Hastelloy C276 studs outperform every standard stainless steel and most nickel alloys in oxidising and reducing acid service. These studs are routinely specified under NACE MR0175/ISO 15156 for sour gas processing, chemical reactor closures, FGD scrubber flanges, and pharmaceutical pressure vessel connections worldwide.

Quick Specifications

MaterialHastelloy C276
UNS NumberN10276
DIN Number2.4819
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 Strength283 MPa (41 ksi) min
HardnessMax 35 HRC / 241 HB
? All material certified by NABL-accredited laboratory. PMI available on request.

Complete the Fastener Set

Other Hastelloy C276 Fastener Products Available from RealBolt

RealBolt also manufactures the complete Hastelloy C276 fastener range from certified nickel-molybdenum-chromium superalloy bar stock, including Hastelloy C276 Bolts, Hastelloy C276 Nuts, Hastelloy C276 Screws, Hastelloy C276 Washers, and Hastelloy C276 Threaded Rods. All Hastelloy C276 fastener types are produced to ASTM with full EN 10204 MTC 3.1/3.2 documentation.
Hastelloy C276 Bolts
Hastelloy C276 Nuts
Hastelloy C276 Screws
Hastelloy C276 Washers
Hastelloy C276 Threaded Rods

Technical Data

Hastelloy C276 Studs Dimensions, Sizes & Thread Standards

Hastelloy C276 Studs are available in metric M6–M100 and inch ¼″–4″ as standard. Per DIN 938 (short end stud) / DIN 939 (long end stud) / ASME B16.5 (flange stud bolts). Custom lengths in 5mm increments. Inch dimensions available per ASME B18.31.2.

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

Size (M)Pitch (mm)Shank Dia (mm)Short End (mm)Min L (mm)Max L (mm)
M61.06.0620200
M81.258.01025250
M101.510.01230300
M121.7512.01535400
M162.016.02045500
M202.520.02555600
M243.024.03065700
M303.530.03880900
M364.036.0451001000
M424.542.0521201200
M485.048.0601401500
M565.556.0701601800
M646.064.0801802000
M726.072.0902002200
M806.080.01002202500
M1006.0100.01252603000

Dimensional & Material Standards

StandardCoversThread
DIN 938Studs, short end engagementMetric
DIN 939Studs, long end engagementMetric
ISO 4032Hex nuts for studsMetric
ASME B18.31.2Continuous thread studsUNC/UNF
ASME B16.5Stud bolts for flangesUNC
MSS SP-75Stud bolts, high-pressureUNC
ASME B16.47Large diameter flange studsUNC
Material StandardRequirement
ASTM B574Bar/rod - UNS N10276
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 C276 Chemical Composition

Hastelloy C276 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 C276 studs order from RealBolt.

Chemical Composition per ASTM B574

ElementComposition (%)
Nickel (Ni)Balance (approx. 57% min)
Molybdenum (Mo)15.0-17.0%
Chromium (Cr)14.5-16.5%
Iron (Fe)4.0-7.0%
Tungsten (W)3.0-4.5%
Cobalt (Co)2.5% max
Manganese (Mn)1.0% max
Carbon (C)0.01% max
Silicon (Si)0.08% max
Vanadium (V)0.35% max
? All heats verified by NABL-accredited spectrometry. PMI available on request.

Why Hastelloy C276 Alloy Composition Matters for Studs

Mo (15–17%) + W (3–4.5%) — Dual Reducing Acid Resistance
The combined molybdenum and tungsten content gives Hastelloy C276 studs a PREN exceeding 70, providing outstanding resistance to reducing acids including hydrochloric, sulfuric, and phosphoric acid — environments that rapidly attack standard stainless steel fasteners.
Ultra-Low Carbon (0.01% max) — Sensitisation Prevention
The extremely low carbon ceiling prevents carbide precipitation at grain boundaries during welding or elevated-temperature service. Hastelloy C276 studs retain full intergranular corrosion resistance in the as-welded condition without any post-weld heat treatment.
Cr (14.5–16.5%) — Oxidising Environment Stability
Chromium provides a stable passive film in mildly oxidising conditions and wet chlorine environments. Combined with molybdenum, this dual protection mechanism makes C276 studs uniquely suited to mixed oxidising-reducing process streams where no single-element alloy performs adequately.

Fastener Performance

Hastelloy C276 Studs Mechanical Properties & Torque Reference

The table below lists mechanical properties and torque reference for Hastelloy C276 Studs per ASTM. Hastelloy C276 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 C276 Studs

Stud SizeDry (Nm)Lubricated (Nm)Clamp Load (kN)
M12725828
M1617514067
M20345276107
M24600480155
M301200960247
M3620801664358
M4233202656493
M4849203936648
?? Anti-galling: Use nickel-based anti-seize (Molykote P-37 or Bostik Never-Seez Pure Nickel). Lubricated values assume K=0.15. Never use copper-based anti-seize on nickel alloys - galvanic incompatibility accelerates thread corrosion.

Industry Applications

Hastelloy C276 Studs Applications — Industries & End Uses

Hastelloy C276 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 C276 studs application details and RealBolt stock availability.
Hastelloy C276 stud bolt sets are the standard specification for pressure vessel nozzle flanges, reactor closure heads, and heat exchanger channel covers in hydrochloric acid, sulfuric acid, phosphoric acid, and mixed halide process streams. Specified under ASME VIII Div.1 and TEMA Class R for the most aggressive chemical service environments.
FGD scrubber internals, absorber tower flanges, and ductwork connections operate in saturated HCl and SO2-bearing gas at elevated temperatures. Hastelloy C276 studs resist wet chlorine attack and sulfurous acid condensate that destroys duplex stainless and alloy 904L fasteners within months.
NACE MR0175/ISO 15156 compliant Hastelloy C276 studs are specified for sour gas processing flanges, amine treater vessels, and H2S-bearing wellhead connections where both sulfide stress cracking resistance and pitting immunity are simultaneously required. Hardness controlled to 35 HRC max.
Hastelloy C276 studs are used in pharmaceutical reactor closures, sterile process vessel flanges, and CIP/SIP system connections where FDA-compliant materials, crevice corrosion resistance, and cleanability under aggressive sanitising agents are mandatory requirements.

Hastelloy C276 Studs Standards & International Certifications

Hastelloy C276 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 C276 Studs from India's Leading Manufacturer — Get a Competitive Quote Today

Partner with RealBolt — India’s leading manufacturer of certified Hastelloy C276 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 C276 Studs — Frequently Asked Questions

Browse expert answers to common questions about Hastelloy C276 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 C276 studs selection and pricing.
Hastelloy C276 studs are manufactured to DIN 938 (short end engagement), DIN 939 (long end engagement), and ASME B18.31.2 for continuous thread studs in inch dimensions. Flange stud bolt sets for ASME B16.5 Class 150 through Class 2500 flanges are supplied per ASME B16.5 Appendix E thread dimensions. MSS SP-75 stud bolts for high-pressure fittings are also available. Custom thread forms including BSW, BSF, and BSPP are produced on request with a 15 working day lead time.
Yes – Hastelloy C276 (UNS N10276) is listed in NACE MR0175/ISO 15156 Part 3 Table B.4 for use in H2S-containing sour service environments. Compliance requires hardness to be controlled at 35 HRC maximum, which is verified by Rockwell hardness testing on each production lot. All sour service stud shipments include a hardness survey report alongside the EN 10204 3.1 MTC. Additional TPI-witnessed 3.2 certification is available for critical wellhead and pressure vessel applications.
Both alloys are premium nickel-based fastener materials, but they serve different corrosion environments. Hastelloy C276 (Mo 15-17%, W 3-4.5%) is superior in reducing acid environments – hydrochloric acid, sulfuric acid, and wet chlorine – where its PREN exceeds 70. Inconel 625 (Mo 8-10%, Nb 3.15-4.15%) performs better in seawater immersion and oxidising acid service and offers higher tensile strength at 758 MPa versus C276’s 690 MPa. For mixed acid or HCl-dominant process streams, C276 studs are the correct specification. For offshore structural flanges and seawater service, Inconel 625 stud bolts are preferred.
Always use a nickel-based anti-seize compound such as Molykote P-37, Jet-Lube KOPR-KOTE Pure Nickel, or Bostik Never-Seez Pure Nickel. Apply to both threaded ends and the nut bearing face before assembly. Reduce target torque values by approximately 20% compared to dry assembly values. Copper-based and zinc-based anti-seize compounds must never be used on Hastelloy C276 or any nickel alloy fastener – the galvanic potential difference between copper and nickel accelerates crevice corrosion at the thread interface, particularly in wet process environments.

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