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ISO 9001:2015 · UNS N10276–N06002 · ASTM B574–B435

Hastelloy Fasteners Manufacturer, Supplier & Exporter of Engineered Fasteners

Hastelloy fasteners offer unmatched corrosion resistance in the most aggressive chemical environments. We supply Hastelloy C276, C22, B2, B3, C2000 and G35 fasteners for chemical, pharmaceutical, and oil & gas industries.
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6

Grades

36

Products

-196°C

Min Temp

1204°C

Max Temp

690 MPa

Min tensile strength · Hastelloy C276 per ASTM B574

Exceptional

Resistance to HCl, H₂SO₄ and oxidizing acids

8.89 g/cm³

Density (avg) · Mo-rich Ni alloy

The acid-resistant superalloy explained

What is Hastelloy Fasteners?

Hastelloy is a registered family of nickel-molybdenum-chromium superalloys developed by Haynes International, engineered specifically for outstanding resistance to severe chemical attack. The alloy series — including Hastelloy C276, C22, B2 and B3 — maintains structural integrity across a broad range of reducing and oxidising acid environments, making it the material of choice for chemical reactors, pharmaceutical vessels and flue gas desulfurization equipment. Hastelloy fasteners are specified where stainless steel or Inconel would rapidly corrode in hydrochloric acid, sulfuric acid, wet chlorine or mixed acid environments. The primary fastener grades are Hastelloy C276 (UNS N10276) for broad-spectrum acid resistance, and Hastelloy B2/B3 (UNS N10665/N10675) for concentrated hydrochloric acid service.
PropertySpecification
Base ElementNickel (Ni)
Mo Content6–30%
Cr Content14–31%
Max Service Temperature1204°C
Density8.22–9.22 g/cm³
ASTM StandardsB574, B335, B582, B435

Hastelloy grades — which do you need?

Multiple fastener grades of Hastelloy Fasteners provide tailored performance across demanding engineering applications, with each material grade offering distinct mechanical properties, corrosion resistance, temperature capability, and strength. Users should compare the available industrial fasteners grades below to refine material selection for specific operating environments, industries, and engineering requirements.

Grade UNS Mo % Key Property Max Temp Best Application
Hastelloy C276 (Most Popular) UNS N10276 15–17% HCl & H₂SO₄ resistant 1038°C Chemical reactors View grade
Hastelloy C22 UNS N06022 12–14% Mixed acid resistant 1038°C Nuclear, chemicals View grade
Hastelloy C2000 UNS N06200 15–17% Broad corrosion resistance 1038°C Chemical processing View grade
Hastelloy B2 UNS N10665 26–30% HCl resistant 593°C Acid processing View grade
Hastelloy B3 UNS N10675 28–31% Stable in HCl 593°C Hydrochloric service View grade
Hastelloy G35 UNS N06035 8–10% Wet acid resistant 980°C Fertilizer plants View grade
Hastelloy B2
Hastelloy B3
Hastelloy C2000
Hastelloy C22
Hastelloy C276
Hastelloy G35

Hastelloy Fasteners — International Standards & Material Certifications

Hastelloy Fasteners from RealBolt Engineering Industries are manufactured to ASME SB-574, SB-335, SB-582, and SB-435 material standards. Every batch ships with EN 10204 MTC 3.1; NACE MR0175/ISO 15156 sour gas documentation, third-party 3.2 certification, and PMI (XRF) test reports are available on request for all grades.
Standards
DIN 931 DIN 933 DIN 912 DIN 938 DIN 939 DIN 976-1 DIN 934 DIN 125A DIN 127 ISO 4014 ISO 4017 ISO 4762 ISO 4032 ASME B18.2.1 ASME B18.3 ASME B18.31.2 ASME B18.2.2 IS 1364 IS 1367
Certifications
ISO 9001:2015 NACE MR0175 NABL Lab PED 2014/68/EU MTC 3.1 / 3.2

Hastelloy Fasteners Applications — Industries & Use Cases

Hastelloy Fasteners from RealBolt Engineering Industries are specified by engineers and procurement teams across demanding industries where exceptional resistance to hydrochloric acid, sulfuric acid, wet chlorine, and mixed oxidizing-reducing chemical environments is critical to fastener performance and service life. Primary end-use sectors for Hastelloy Fasteners include chemical processing, pharmaceutical, oil and gas acid stimulation, flue gas desulfurization, and aerospace combustion zones — click each industry below to see specific application details and recommended grades.
Hastelloy C276 is the industry benchmark for chemical reactor bolting exposed to HCl, sulfuric, hydrofluoric and phosphoric acids at elevated temperatures. Hastelloy C22 outperforms C276 in mixed oxidizing-reducing environments and wet chlorine service.
Hastelloy C276 and C22 fasteners are used in HF alkylation units, acid gas injection equipment and sour-gas wellheads requiring NACE MR0175 compliance. B2/B3 grades are specified for HCl acid stimulation tools.
Hastelloy C22 fasteners are preferred in pharmaceutical reactors where both oxidizing cleaning agents and reducing process chemicals are encountered. Smooth surface finish options (Ra ≤ 0.8 µm) available for hygienic service.
FGD scrubber internals, absorber towers and chimney liner fasteners specify Hastelloy C276 or G30 for resistance to wet sulfur dioxide, hydrochloric acid and chloride stress corrosion.
Hastelloy X fasteners retain strength and oxidation resistance to 1204°C, making them the standard for gas turbine combustion zone hardware, transition ducts and afterburner components.

Hastelloy vs Inconel vs Stainless Steel

This comparison table guides engineers in selecting between Hastelloy Fasteners, Inconel Fasteners, and Stainless Steel Fasteners based on HCl resistance, H₂SO₄ resistance, maximum operating temperature, tensile strength, NACE MR0175 sour service compliance, and relative material cost — ensuring the correct alloy is specified for your process chemistry and budget. Use this data to make an informed alloy selection for your specific operating environment, design code, and budget — or contact RealBolt’s technical team for a project-specific recommendation.
Property Hastelloy C276 Inconel 625 SS 317L
Max service temp 1038°C 980°C 825°C
HCl corrosion resistance Exceptional Good Poor
H2SO4 resistance Excellent Good Moderate
Tensile strength (min) 690 MPa 758 MPa 515 MPa
Relative cost High High Low
NACE MR0175 compliant Yes Yes Conditional

Verdict: Hastelloy C276 is the top choice for aggressive acid environments, especially HCl. Choose Inconel 625 for combined high-temperature and sour-gas corrosion; SS 317L for general chemical duty at lower cost.

Need Hastelloy fasteners? Get a competitive price today.

Partner with RealBolt Engineering Industries for certified Hastelloy Fasteners backed by full EN 10204 material test reports, competitive pricing, and reliable global delivery from our Mumbai facility. Our corrosion engineering team supports grade selection across Hastelloy C276, C22, B2, B3, C2000, and G35, and supplies NACE MR0175-compliant, PMI-verified Hastelloy Fasteners with EN 10204 3.1/3.2 MTRs in sizes M6–M100 or as custom-machined specials to your drawing. Request a quote today and receive a competitive price within 24 hours.
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Hastelloy Fasteners — Common Questions Answered by Our Technical Team

Browse the expert answers below to the most frequently asked questions about Hastelloy Fasteners — covering C276 vs C22 selection, HCl and H₂SO₄ service guidance, NACE MR0175 sour gas compliance, ASTM B574/B335 standards, galling precautions, available sizes M6–M100, and MTC 3.1/3.2 certification. If your question is not answered here, contact the RealBolt technical team directly for grade-specific guidance, project support, and competitive pricing on Hastelloy Fasteners.
Hastelloy C276 (UNS N10276) is the all-round acid-resistant alloy for HCl, H₂SO₄ and reducing environments. C22 (UNS N06022) adds higher chromium (20–22%) for superior resistance to oxidising acids and mixed oxidising-reducing conditions. Choose C276 for single-acid processes; C22 for multi-acid or alternating service.
Yes. Hastelloy C276 and C22 meet NACE MR0175 / ISO 15156 for sour service (H₂S + chlorides). We supply MTC 3.1 / 3.2 with NACE compliance documentation. Hastelloy B2/B3 are not recommended for H₂S environments due to low chromium content.
Hastelloy bolts, nuts, studs and threaded rods are available from M6 to M100 (¼″ to 4″). Hex bolts, heavy hex nuts, stud bolts and all-thread rod in both metric and imperial thread forms. Custom lengths up to 3000 mm.
Yes. Hastelloy fasteners, like all nickel alloys, are susceptible to thread galling. Use a nickel or molybdenum-based anti-seize compound, hand-start all threads before torquing, and ensure mating surfaces are clean and undamaged.

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