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Hastelloy C22 Nuts Manufacturer & Exporter in India

Explore Hastelloy C22 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 C22 Nuts?

Hastelloy C22 nuts are nickel-chromium-molybdenum-tungsten alloy fasteners manufactured from UNS N06022 bar stock conforming to ASTM B574. The alloy’s exceptional corrosion resistance stems from its precisely balanced chemistry – 20-22.5% chromium, 12.5-14.5% molybdenum, and 2.5-3.5% tungsten – delivering outstanding resistance to both oxidising and reducing corrosive media that no single-phase stainless steel can replicate.

With a PREN exceeding 65, Hastelloy C22 nuts resist pitting, crevice corrosion, and stress corrosion cracking in chloride-bearing environments, wet chlorine gas, hypochlorite solutions, and mixed acid streams. These nuts are specified under NACE MR0175/ISO 15156 for sour-service flanged connections, chemical reactor closures, and aggressive process piping assemblies across the chemical processing, pharmaceutical, and offshore industries worldwide.

Quick Specifications

MaterialHastelloy C22
UNS NumberN06022
DIN Number2.4602
Material StandardASTM B574
Nut Standard (Metric)DIN 934 / DIN 6915 / ISO 4032
Nut Standard (Inch)ASME B18.2.2
Thread FormISO Metric / UNC / UNF
Size 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 C22 Fastener Products Available from RealBolt

RealBolt also manufactures the complete Hastelloy C22 fastener range from certified nickel-molybdenum-chromium superalloy bar stock, including Hastelloy C22 Bolts, Hastelloy C22 Screws, Hastelloy C22 Washers, Hastelloy C22 Studs, and Hastelloy C22 Threaded Rods. All Hastelloy C22 fastener types are produced to ASTM with full EN 10204 MTC 3.1/3.2 documentation.
Hastelloy C22 Bolts
Hastelloy C22 Screws
Hastelloy C22 Washers
Hastelloy C22 Studs
Hastelloy C22 Threaded Rods

Technical Data

Hastelloy C22 Nuts Dimensions, Sizes & Thread Standards

Hastelloy C22 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. Inch dimensions available per ASME B18.2.2. Custom thread forms on request. All Hastelloy C22 nuts dimensions conform to applicable DIN, ISO, and ASME B18 standards.

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

Size (M)Pitch (mm)A/F (mm)Nut Height (mm)A/C (mm)Weight (kg/100)
M61.0105.011.050.18
M81.25136.514.380.38
M101.5178.018.900.72
M121.751910.020.781.10
M162.02413.026.752.30
M202.53016.032.954.50
M243.03619.039.557.80
M303.54624.050.8516.20
M364.05529.060.7928.50
M424.56534.071.3046.00
M485.07538.082.6070.00
M565.58545.093.56112.00
M646.09551.0104.65162.00
M726.010558.0115.60228.00
M806.011564.0127.00310.00
M1006.014580.0160.00610.00

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 flange stud setsUNC
MSS SP-75Heavy hex nuts, high-pressureUNC
Material StandardRequirement
ASTM B574Bar/rod - UNS N06022
ASTM F467Fastener mechanical properties
NACE MR0175Sour service =35 HRC
EN 10204 3.1Mill test certificate
EN 10204 3.2TPI-witnessed MTC

Material Chemistry

Hastelloy C22 Chemical Composition

Hastelloy C22 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 C22 nuts order from RealBolt.

Chemical Composition per ASTM B574

ElementComposition (%)
Nickel (Ni)Balance (min 56%)
Chromium (Cr)20.0-22.5%
Molybdenum (Mo)12.5-14.5%
Tungsten (W)2.5-3.5%
Iron (Fe)2.0-6.0%
Cobalt (Co)2.5% max
Carbon (C)0.010% max
Manganese (Mn)0.50% max
Silicon (Si)0.08% max
Vanadium (V)0.35% max
Phosphorus (P)0.02% max
Sulphur (S)0.02% max
? All heats verified by NABL-accredited spectrometry. PMI available on request.

Why Hastelloy C22 Alloy Composition Matters for Nuts

Mo (12.5–14.5%) + W (2.5–3.5%) — Superior Pitting Resistance
The combined molybdenum and tungsten content gives Hastelloy C22 a PREN exceeding 65 — the highest of any commercially available nickel alloy. This translates directly to immunity from crevice corrosion in the confined geometry under nut bearing faces, even in hot chloride brines and FeCl3 test solutions.
Cr (20–22.5%) — Oxidising Media Resistance
The elevated chromium level provides resistance to oxidising acids including nitric acid, chromic acid, and wet chlorine gas — environments where C276 (lower Cr) underperforms. Hastelloy C22 nuts are therefore the preferred choice for mixed acid service where both oxidising and reducing conditions alternate.
Ultra-Low Carbon (0.010% max) — Sensitisation-Free
The extremely low carbon ceiling prevents carbide precipitation at grain boundaries during welding or elevated-temperature service. Hastelloy C22 nuts retain full intergranular corrosion resistance in the as-welded condition without any post-weld heat treatment requirement.

Fastener Performance

Hastelloy C22 Nuts Mechanical Properties & Torque Reference

The table below lists mechanical properties and torque reference for Hastelloy C22 Nuts per ASTM. Hastelloy C22 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 C22 Nuts on Matching Stud Bolts

Nut SizeDry (Nm)Lubricated (Nm)Clamp Load (kN)
M12725828
M1617514068
M20345276108
M24600480157
M301200960250
M3621001680363
M4233502680500
M4849803984658
?? 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 C22 Nuts Applications — Industries & End Uses

Hastelloy C22 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 C22 nuts application details and RealBolt stock availability.
Hastelloy C22 heavy hex nuts are the standard specification for reactor closure flanges, heat exchanger channel covers, and agitator shaft gland assemblies handling mixed oxidising-reducing acid streams, hydrochloric acid, sulphuric acid, and chlorinated organic solvents. NACE MR0175 compliant for sour-service process piping.
Hex nuts and coupling nuts for sterile process vessel nozzle connections, CIP/SIP piping flanges, and high-purity solvent handling systems where contamination from corrosion products is unacceptable. Hastelloy C22 meets FDA-relevant cleanliness requirements and resists the aggressive cleaning agents used in pharmaceutical manufacturing.
Heavy hex nuts for absorber tower internal flange connections, spray header assemblies, and mist eliminator support structures exposed to hot, saturated SO2-bearing gas streams with chloride concentrations that rapidly destroy duplex stainless steel fasteners. Hastelloy C22 provides multi-year service life in these conditions.
Hex nuts for seawater lift pump flanges, desalination plant high-pressure membrane housings, and offshore platform firewater system connections. The PREN 65+ rating ensures complete immunity to pitting and crevice corrosion under nut bearing faces in ambient and elevated-temperature seawater service.

Hastelloy C22 Nuts Standards & International Certifications

Hastelloy C22 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 C22 Nuts from India's Leading Manufacturer — Get a Competitive Quote Today

Partner with RealBolt — India’s leading manufacturer of certified Hastelloy C22 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
+91 90226 36025
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Answers for Buyers

Hastelloy C22 Nuts — Frequently Asked Questions

Browse expert answers to common questions about Hastelloy C22 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 C22 nuts selection and pricing.
Hastelloy C22 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). For ASME B16.5 flange stud bolt sets, heavy hex nuts are supplied per ASME B18.2.2 heavy series. Coupling nuts, lock nuts, and flange nuts are available on request. Custom thread forms including BSW, BSF, and BSPP can be produced with a 15 working day lead time.
Hastelloy C22 (UNS N06022) outperforms C276 (UNS N10276) in oxidising acid environments due to its higher chromium content (20-22.5% vs 14.5-16.5%). C22 also has a higher PREN (65+ vs 60+), giving marginally better pitting resistance in chloride media. For mixed acid service – where both oxidising and reducing conditions occur – C22 is the preferred specification. C276 remains competitive in strongly reducing acid environments such as concentrated HCl. When in doubt, specify C22 for broader chemical compatibility.
Yes – Hastelloy C22 nuts comply with NACE MR0175/ISO 15156 for sour-service applications when supplied in the annealed condition with hardness not exceeding 35 HRC. We supply hardness survey reports per NACE requirements as standard on all sour-service orders. The alloy’s resistance to sulphide stress cracking (SSC) and hydrogen-induced cracking (HIC) makes it suitable for H2S-bearing wellhead, pipeline, and process piping flange connections.
No formal MOQ applies to standard sizes (M12-M36) held ex-stock – single-piece supply is available for emergency maintenance and shutdown requirements. Custom sizes and non-standard thread forms carry a minimum of 10 kg per order. ASME B16.5 flange nut sets are supplied by the set with no minimum quantity. 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
  • 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