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Inconel 625 Nuts Manufacturer & Exporter in India

Explore Inconel 625 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

1200

Max Temp

🌡

1200

Suitable for continuous service up to approximately 1200°C under typical operating conditions.

⚡

760

Typical tensile strength around 760 MPa depending on product form and heat treatment.

🛡

Excellent

Excellent corrosion resistance in a wide range of industrial environments.

⚖

8.4

Typical density is approximately 8.4 g/cm³.

Product Overview

What are Inconel 625 Nuts?

Inconel 625 nuts are nickel-chromium-molybdenum alloy fasteners machined from UNS N06625 bar stock conforming to ASTM B446. The alloy achieves its exceptional mechanical performance through solid-solution strengthening via molybdenum (8-10%) and niobium (3.15-4.15%), delivering a minimum tensile strength of 758 MPa in the annealed condition without any precipitation hardening treatment.

With a PREN exceeding 51, Inconel 625 nuts provide complete immunity to chloride-induced pitting and crevice corrosion in seawater environments – a capability far beyond standard austenitic stainless steels. These nuts are specified under NACE MR0175/ISO 15156 for sour-service flange assemblies, subsea wellhead connections, offshore structural joints, and high-temperature chemical process equipment worldwide.

Quick Specifications

MaterialInconel 625
UNS NumberN06625
DIN Number2.4856
Material StandardASTM B446
Nut Standard (Metric)DIN 934 / DIN 980 / ISO 4032
Nut Standard (Inch)ASME B18.2.2
Thread FormISO Metric / UNC / UNF
Size RangeM6-M100 / ¼"-4"
Tensile Strength758 MPa (110 ksi) min
Yield Strength414 MPa (60 ksi) min
HardnessMax 35 HRC / 220 HB
? All material certified by NABL-accredited laboratory. PMI available on request.

Complete the Fastener Set

Other Inconel 625 Fastener Products Available from RealBolt

RealBolt also manufactures the complete Inconel 625 fastener range from certified nickel-chromium superalloy bar stock, including Inconel 625 Bolts, Inconel 625 Screws, Inconel 625 Washers, Inconel 625 Studs, and Inconel 625 Threaded Rods. All Inconel 625 fastener types are produced to ASTM with full EN 10204 MTC 3.1/3.2 documentation.
Inconel 625 Bolts
Inconel 625 Screws
Inconel 625 Washers
Inconel 625 Studs
Inconel 625 Threaded Rods

Technical Data

Inconel 625 Nuts Dimensions, Sizes & Thread Standards

Inconel 625 Nuts are available in metric M6–M100 and inch ¼″–4″ as standard. Per DIN 934 (hex nuts) / DIN 980 (prevailing torque) / ISO 4032. Custom widths and heights available. Inch dimensions per ASME B18.2.2. All Inconel 625 nuts dimensions are verified against applicable DIN, ISO, and ASME B18

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

Size (M)Pitch (mm)A/F (mm)Nut Height (mm)A/C (mm)Weight (g/pc)
M61.0105.011.053.5
M81.25136.514.387.0
M101.5178.018.9013.0
M121.751910.020.0320.0
M162.02413.026.7542.0
M202.53016.032.9580.0
M243.03619.039.55138.0
M303.54624.050.85280.0
M364.05529.060.79490.0
M424.56534.071.30790.0
M485.07538.082.601150.0
M565.58545.093.561800.0
M646.09551.0104.862600.0
M726.010558.0116.163700.0
M806.011564.0127.465000.0
M1006.014580.0160.009800.0

Dimensional & Material Standards

StandardCoversThread
DIN 934Hex nuts, style 1Metric
DIN 980Prevailing torque hex nutsMetric
DIN 6330Heavy hex nutsMetric
ISO 4032Hex nuts, style 1Metric
ISO 4033Hex nuts, style 2Metric
ASME B18.2.2Hex & heavy hex nutsUNC/UNF
ASME B16.5Heavy hex nuts for flangesUNC
Material StandardRequirement
ASTM B446Bar/rod - UNS N06625
ASTM F467Fastener mechanical properties
NACE MR0175Sour service =35 HRC
EN 10204 3.1Mill test certificate
EN 10204 3.2TPI-witnessed MTC

Material Chemistry

Inconel 625 Chemical Composition

Inconel 625 Nuts are manufactured from a nickel-chromium superalloy containing nickel (72% min), chromium (14–17%), and iron (6–10%). Each element is precisely controlled per ASTM — nickel provides chloride SCC immunity, chromium drives high-temperature oxidation resistance, and iron balances structural stability and alloy cost.

Chemical Composition per ASTM B446

ElementComposition (%)
Nickel (Ni)58.0% min
Chromium (Cr)20.0-23.0%
Molybdenum (Mo)8.0-10.0%
Niobium + Ta (Nb+Ta)3.15-4.15%
Iron (Fe)5.0% max
Carbon (C)0.10% max
Manganese (Mn)0.50% max
Silicon (Si)0.50% max
Aluminium (Al)0.40% max
Cobalt (Co)1.0% max
? All heats verified by NABL-accredited spectrometry. PMI available on request.

Why Inconel 625 Alloy Composition Matters for Nuts

Mo (8–10%) — Thread Crevice Protection
Molybdenum raises the PREN above 51, providing complete resistance to crevice corrosion within the engaged thread form — the most vulnerable zone in a nut under immersed seawater or chloride-bearing process conditions.
Nb (3.15–4.15%) — Structural Stability at Temperature
Niobium stabilises the austenitic matrix and suppresses sensitisation during elevated-temperature service. Inconel 625 nuts retain full thread integrity and corrosion resistance at continuous service temperatures up to 980°C without embrittlement.
Solid-Solution Strengthening — No Age Hardening Required
Unlike age-hardened alloys such as Inconel 718, alloy 625 achieves its 758 MPa tensile strength through solid-solution mechanisms alone. This eliminates the risk of over-ageing in service and simplifies incoming inspection for procurement engineers.

Fastener Performance

Inconel 625 Nuts Mechanical Properties & Torque Reference

The table below lists mechanical properties and torque reference for Inconel 625 Nuts per ASTM. Inconel 625 nuts achieve 760 MPa tensile strength, with hardness, yield, and elongation values verified by NABL-accredited testing and reported in the EN 10204 MTC.

Nut Proof Load & Torque Reference - Metric

Nut SizeProof Load (kN)Assembly Torque Dry (Nm)Assembly Torque Lubricated (Nm)
M12478870
M1688210168
M20137420336
M24198730584
M3031414601168
M3645925402032
M4262840503240
M4882360104808
?? 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 alloy nuts - galvanic incompatibility accelerates thread corrosion.

Industry Applications

Inconel 625 Nuts Applications — Industries & End Uses

Inconel 625 Nuts from RealBolt are specified across oil and gas, aerospace, chemical processing, and power generation where excellent corrosion resistance and 760 MPa tensile strength are required for reliable fastener performance. Click each industry below for detailed application examples.
Inconel 625 heavy hex nuts are the standard pairing for ASME B16.5/B16.47 flange stud bolt sets on wellhead assemblies, BOP stacks, and subsea Christmas tree connections. Fully compliant with NACE MR0175/ISO 15156 for H2S sour service. Supplied as matched-heat sets with single EN 10204 3.1 MTC covering both studs and nuts.
Hex nuts and heavy hex nuts for offshore platform structural bolted connections, splash-zone pipe clamps, marine heat exchanger channel covers, and propeller shaft coupling flanges. PREN 51+ ensures zero pitting under nut bearing faces in continuous seawater immersion – no coating or cathodic protection required.
Inconel 625 nuts are specified for reactor closure flange assemblies, TEMA heat exchanger channel cover joints, and pressure vessel nozzle connections operating in phosphoric acid, hydrofluoric acid, organic acid, and mixed halide environments where SS 316L nuts fail within months.
Nuts for aircraft exhaust system flange joints, thrust reverser structural attachments, and nacelle pylon connections where simultaneous oxidation resistance to 980°C, vibration fatigue resistance, and low magnetic permeability are required. Manufactured to AMS 5666 material specification.

Inconel 625 Nuts Standards & International Certifications

Inconel 625 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 Inconel 625 Nuts from India's Leading Manufacturer — Get a Competitive Quote Today

Partner with RealBolt — India’s leading manufacturer of certified Inconel 625 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
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Answers for Buyers

Inconel 625 Nuts — Frequently Asked Questions

Browse expert answers to common questions about Inconel 625 Nuts from RealBolt — covering ASTM standards, max service temperature, corrosion resistance, available sizes, lead times, and MTC certification. Contact our technical team directly for project-specific guidance on Inconel 625 nuts selection and pricing.
Inconel 625 hex nuts are available to DIN 934 (metric style 1), DIN 6330 (heavy hex metric), ISO 4032 (style 1), ISO 4033 (style 2), 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. Custom configurations including coupling nuts, slotted nuts, and castle nuts are available on request with 15 working day lead time.
Pairing Inconel 625 nuts with standard austenitic stainless steel studs (e.g., SS 316L) is generally not recommended for immersed seawater or aggressive chloride service. The galvanic potential difference between the two alloys can accelerate corrosion of the less noble stainless steel stud. For optimal performance, Inconel 625 nuts should be paired with Inconel 625 or equivalent nickel alloy studs. In atmospheric or mild service, mixed pairing may be acceptable – consult your corrosion engineer.
Yes – Inconel 625 nuts are fully compliant with NACE MR0175/ISO 15156 for sour (H2S-containing) service when supplied in the annealed condition with hardness not exceeding 35 HRC / 220 HB. Each nut is hardness-tested and the result is recorded on the EN 10204 3.1 MTC. For Class 900-2500 sour service flange sets, a full hardness survey per NACE MR0175 Annex A is available on request.
Standard sizes M12-M48 are held ex-stock in Mumbai with no formal MOQ – single pieces are supplied for emergency maintenance and shutdown requirements. Custom sizes, special thread forms, and non-standard nut heights carry a minimum of 10 kg per order. ASME B16.5 flange nut sets are supplied by the complete set with no minimum quantity. Volume price breaks apply at 100 pieces, 500 pieces, and 1,000 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