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Nimonic 263 Nuts Manufacturer & Exporter in India

Explore Nimonic 263 Nuts Manufacturer & Exporter in India manufactured for demanding industrial applications with reliable strength, corrosion resistance and compliance with international standards.
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-196

Min Temp

870

Max Temp

🌡

870

Suitable for continuous service up to approximately 870°C under typical operating conditions.

⚡

620

Typical tensile strength around 620 MPa depending on product form and heat treatment.

🛡

Very Good

Very Good corrosion resistance in a wide range of industrial environments.

⚖

8

Typical density is approximately 8.0 g/cm³.

Product Overview

What are Nimonic 263 Nuts?

Nimonic 263 nuts are high-strength, nickel-cobalt-chromium-molybdenum alloy fasteners manufactured from UNS N07263 bar stock conforming to ASTM B805. Designed for service in temperatures up to 800°C, these nuts offer a unique combination of age-hardened strength, oxidation resistance, and ductility. The alloy’s balanced chemistry, with 19-21% chromium and 5.6-6.1% molybdenum, ensures excellent resistance to thermal fatigue and stress corrosion cracking.

Nimonic 263 nuts are widely specified in gas turbine engines, petrochemical reactors, and high-temperature bolted joints where conventional stainless steel or Inconel fasteners are inadequate. All nuts are supplied with full traceability and EN 10204 3.1 certification.

Quick Specifications

MaterialNimonic 263
UNS NumberN07263
DIN Number2.4650
Material StandardASTM B805
Nut Standard (Metric)DIN 934 / ISO 4032
Nut Standard (Inch)ASME B18.2.2
Thread FormISO Metric / UNC / UNF
Diameter RangeM6-M64 / ¼"-2½"
Tensile Strength930 MPa (135 ksi) min
Yield Strength585 MPa (85 ksi) min
HardnessMax 32 HRC / 300 HB
? All material certified by NABL-accredited laboratory. PMI and hardness survey available on request.

Complete the Fastener Set

Other Nimonic 263 Fastener Products Available from RealBolt

RealBolt also manufactures the complete Nimonic 263 fastener range from certified nickel-chromium-cobalt superalloy bar stock, including Nimonic 263 Bolts, Nimonic 263 Screws, Nimonic 263 Washers, Nimonic 263 Studs, and Nimonic 263 Threaded Rods. All Nimonic 263 fastener types are produced to ASTM with full EN 10204 MTC 3.1/3.2 documentation.
Nimonic 263 Bolts
Nimonic 263 Screws
Nimonic 263 Washers
Nimonic 263 Studs
Nimonic 263 Threaded Rods

Technical Data

Nimonic 263 Nuts Dimensions, Sizes & Thread Standards

Nimonic 263 Nuts are available in metric M6–M100 and inch ¼″–4″ as standard. Per DIN 934 (hex nut) / ISO 4032. Custom thread pitches and heights available. Inch dimensions per ASME B18.2.2. All Nimonic 263 nuts dimensions are verified against applicable DIN, ISO, and ASME B18 standards before dispatch from

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

Size (M)Pitch (mm)A/F (mm)Height (mm)
M61.0105.0
M81.25136.5
M101.5178.0
M121.751910.0
M162.02413.0
M202.53016.0
M243.03619.0
M303.54624.0
M364.05529.0
M424.56534.0
M485.07538.0
M565.58545.0
M646.09551.0

Dimensional & Material Standards

StandardCoversThread
DIN 934Hex nutsMetric
ISO 4032Hex nutsMetric
ASME B18.2.2Hex & heavy hex nutsUNC/UNF
ISO 2320Prevailing torque nutsMetric
EN 24032Hex nutsMetric
Material StandardRequirement
ASTM B805Bar/rod - UNS N07263
AMS 5872Forging/fastener stock
EN 10204 3.1Mill test certificate
EN 10204 3.2TPI-witnessed MTC

Material Chemistry

Nimonic 263 Chemical Composition

Nimonic 263 Nuts are manufactured from a precipitation-hardened nickel-chromium-cobalt superalloy with titanium and aluminium additions per AMS and BS HR specifications. These elements form the gamma-prime (Ni₃Al,Ti) precipitate phase that delivers creep rupture strength above 700°C — a performance level unachievable with standard nickel or stainless alloys.

Chemical Composition per ASTM B805

ElementComposition (%)
Nickel (Ni)49.0% min
Cobalt (Co)19.0-21.0%
Chromium (Cr)19.0-21.0%
Molybdenum (Mo)5.6-6.1%
Titanium (Ti)1.9-2.4%
Aluminium (Al)0.5-0.6%
Iron (Fe)0.7% max
Carbon (C)0.04-0.08%
Silicon (Si)0.4% max
Manganese (Mn)0.6% max
Boron (B)0.005% max
Zirconium (Zr)0.06% max
? All heats verified by NABL-accredited spectrometry. PMI available on request.

Why Nimonic 263 Alloy Composition Matters for Nuts

Cr & Co (19–21%) — Oxidation & Thermal Fatigue Resistance
Chromium and cobalt provide Nimonic 263 nuts with outstanding resistance to oxidation and scaling at temperatures up to 800°C, making them ideal for gas turbine and exhaust flange assemblies.
Mo (5.6–6.1%) — Creep Strength
Molybdenum enhances high-temperature strength and resistance to stress rupture, ensuring nuts maintain preload in cyclic thermal environments.
Ti & Al — Age Hardening
Titanium and aluminium enable precipitation hardening, delivering high strength after heat treatment while retaining ductility for safe assembly and disassembly.

Fastener Performance

Nimonic 263 Nuts Mechanical Properties & Torque Reference

The table below lists mechanical properties and torque reference for Nimonic 263 Nuts per ASTM. Nimonic 263 nuts achieve 620 MPa tensile strength, with hardness, yield, and elongation values verified by NABL-accredited testing and reported in the EN 10204 MTC.

Nut SizeRecommended Torque (Nm)Clamp Load (kN)
M127532
M1618065
M20350105
M24600150
M301200240
M362100350
M423200480
M484800650
?? Anti-galling: Use nickel-based anti-seize (Molykote P-37 or equivalent). Lubricated values assume K=0.15. Avoid copper-based anti-seize on nickel alloys.

Industry Applications

Nimonic 263 Nuts Applications — Industries & End Uses

Nimonic 263 Nuts from RealBolt are specified across aerospace gas turbines, power generation, and high-temperature furnaces where very good corrosion resistance and 620 MPa tensile strength are required for reliable fastener performance. Click each industry below for detailed application examples.
Nimonic 263 nuts are the standard for turbine case flanges, combustor assemblies, and afterburner joints in jet engines, where high-temperature strength and oxidation resistance are critical. Qualified to Rolls-Royce MSRR and Pratt & Whitney specifications.
Used in heat recovery steam generator (HRSG) ducting, steam turbine casing joints, and high-temperature exhaust flanges where creep resistance and thermal cycling stability are required.
Hex nuts and lock nuts for reactor closures, reformer tube sheets, and high-pressure vessel flanges exposed to hydrogen, ammonia, and mixed acid environments at elevated temperatures.
Nimonic 263 nuts are specified for turbocharger mounting, exhaust manifold flanges, and high-performance racing engine assemblies where thermal fatigue and vibration resistance are essential.

Nimonic 263 Nuts Standards & International Certifications

Nimonic 263 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, AMS material certification, heat treatment records, and first article inspection report (FAIR) — available on request for all orders.
Standards
DIN 934 ISO 4032 ASME B18.2.2 IS 1367
Certifications
ISO 9001:2015EN 10204 3.1/3.2NABL LabPED 2014/68/EU

Buy Nimonic 263 Nuts from India's Leading Manufacturer — Get a Competitive Quote Today

Partner with RealBolt — India’s leading manufacturer of certified Nimonic 263 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

Nimonic 263 Nuts — Frequently Asked Questions

Browse expert answers to common questions about Nimonic 263 Nuts from RealBolt — covering AMS specification, heat treatment, creep rupture data, max service temperature, sizes, and aerospace certification. Contact our technical team directly for project-specific guidance on Nimonic 263 nuts selection and pricing.
Nimonic 263 hex nuts are available to DIN 934 (metric), ISO 4032, EN 24032, and ASME B18.2.2 (inch hex and heavy hex). Prevailing torque and lock nut types can be supplied to ISO 2320. Custom thread forms (BSW, BSF, Whitworth) are available on request with a typical lead time of 2-3 weeks.
Always use a nickel-based anti-seize compound (such as Molykote P-37 or Jet-Lube Pure Nickel) on threads and nut bearing faces. This prevents galling and ensures consistent preload. Do not use copper-based anti-seize on nickel alloys, as it can cause galvanic corrosion at high temperatures.
Yes – Nimonic 263 nuts are specifically engineered for high-temperature bolted joints in gas turbines, combustors, and exhaust systems. They retain strength and resist oxidation up to 800°C, making them ideal for aerospace and power generation applications.
No formal MOQ for standard metric sizes (M8-M24) held in stock – single pieces can be supplied for urgent maintenance. Custom sizes or inch threads typically require a 5 kg minimum. Price breaks are available at 50, 200, and 500 pieces.

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