+912267437972

+919022636025

enquiry@real-bolt.com

Contact Us

Inconel 625 Screws Manufacturer & Exporter in India

Explore Inconel 625 Screws Manufacturer & Exporter in India manufactured for demanding industrial applications with reliable strength, corrosion resistance and compliance with international standards.
Request a Quote
View Products

-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 Screws?

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

With a PREN exceeding 51, Inconel 625 screws resist chloride-induced pitting and crevice corrosion in seawater environments that would rapidly destroy standard stainless steel fasteners. These screws are specified under NACE MR0175/ISO 15156 for sour-service equipment, subsea instrumentation panels, offshore structural assemblies, and high-temperature chemical process connections worldwide.

Quick Specifications

MaterialInconel 625
UNS NumberN06625
DIN Number2.4856
Material StandardASTM B446
Screw Standard (Metric)DIN 912 / DIN 933 / ISO 4762
Screw Standard (Inch)ASME B18.3 / ASME B18.6.3
Thread FormISO Metric / UNC / UNF
Diameter RangeM3-M64 / #4-2½"
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 Nuts, 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 Nuts
Inconel 625 Washers
Inconel 625 Studs
Inconel 625 Threaded Rods

Technical Data

Inconel 625 Screws Dimensions, Sizes & Thread Standards

Inconel 625 Screws are available in metric M6–M100 and inch ¼″–4″ as standard. Per DIN 912 (socket head cap screws) / DIN 933 (hex head full thread) / ISO 4762. Custom lengths in 5 mm increments. Inch dimensions available per ASME B18.3 and ASME B18.6.3.

Socket Head Cap Screw Dimensions - Metric (DIN 912 / ISO 4762)

Size (M)Pitch (mm)Head Dia (mm)Head Ht (mm)Socket (mm)Min L (mm)Max L (mm)
M30.55.53.02.5650
M40.77.04.03.0880
M50.88.55.04.010100
M61.010.06.05.012150
M81.2513.08.06.016200
M101.516.010.08.020250
M121.7518.012.010.025300
M162.024.016.014.030400
M202.530.020.017.040500
M243.036.024.019.050600
M303.545.030.022.060800
M364.054.036.027.0801000
M424.563.042.032.01001000
M485.072.048.036.01201200
M565.584.056.041.01401500
M646.096.064.046.01602000

Dimensional & Material Standards

StandardCoversThread
DIN 912Socket head cap screwsMetric
DIN 933Hex head screws, full threadMetric
ISO 4762Socket head cap screwsMetric
ISO 7380Button head socket screwsMetric
ASME B18.3Socket head cap screwsUNC/UNF
ASME B18.6.3Machine screwsUNC/UNF
DIN 7991Countersunk socket screwsMetric
Material StandardRequirement
ASTM B446Bar/rod - UNS N06625
ASTM F468Fastener 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 Screws 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
Titanium (Ti)0.40% max
Phosphorus (P)0.015% max
Sulphur (S)0.015% max
? All heats verified by NABL-accredited spectrometry. PMI available on request.

Why Inconel 625 Alloy Composition Matters for Screws

Mo (8–10%) — Crevice Corrosion Immunity Under Screw Heads
Molybdenum elevates the PREN to 51+, providing complete resistance to crevice corrosion in the confined geometry beneath screw heads and within threaded engagement zones — the most vulnerable areas in immersed or splash-zone assemblies.
Nb (3.15–4.15%) — Grain Stability During Machining
Niobium stabilises the austenitic matrix and prevents sensitisation during the heat generated in screw thread rolling and head forming operations. This ensures full corrosion resistance is retained in the finished fastener without post-machining heat treatment.
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 strengthening alone. This eliminates distortion risk during heat treatment and simplifies dimensional control for precision-threaded screws.

Fastener Performance

Inconel 625 Screws Mechanical Properties & Torque Reference

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

Tightening Torque Reference - Inconel 625 Screws (Metric)

Screw SizeDry (Nm)Lubricated (Nm)Clamp Load (kN)
M6129.57.2
M8292313.8
M10574622.5
M12987833.0
M1624019279.0
M20470376126.0
M24810648183.0
M3016201296291.0
M3628202256422.0
?? Anti-galling note: Apply nickel-based anti-seize (Molykote P-37 or equivalent) to threads and bearing face. Lubricated values assume K=0.15. Never use copper-based anti-seize on nickel alloy screws - galvanic incompatibility accelerates thread corrosion.

Industry Applications

Inconel 625 Screws Applications — Industries & End Uses

Inconel 625 Screws 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 socket head cap screws and machine screws are the standard fastener for subsea control module enclosures, subsea valve actuator covers, and ROV-installed instrumentation panels. NACE MR0175 compliant for H2S sour service. Specified under Shell DEP and ExxonMobil EMSP for all wetted fastener positions.
Inconel 625 screws are used to secure cathodic protection anode brackets, marine heat exchanger cover plates, offshore platform grating clips, and subsea pipeline clamp assemblies. The PREN 51+ rating ensures zero pitting or crevice corrosion under screw heads in continuous seawater immersion without protective coatings.
Machine screws and socket head cap screws in Inconel 625 are specified for reactor internal tray fasteners, column packing support grid connections, and heat exchanger floating head cover assemblies in phosphoric acid, hydrofluoric acid, and mixed halide process streams where 316L stainless steel fails within months.
Inconel 625 screws are used in aircraft exhaust duct panel attachments, thrust reverser latch mechanisms, and nacelle firewall connections where simultaneous oxidation resistance to 980°C and high fatigue strength are required. Manufactured to AMS 5666 for aerospace applications.

Inconel 625 Screws Standards & International Certifications

Inconel 625 Screws 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 912 DIN 913 DIN 914 DIN 915 DIN 916 DIN 6912 ISO 4762 ISO 10642 ASME B18.3 EN ISO 4762 IS 1367
Certifications
ISO 9001:2015NACE MR0175NABL LabPED 2014/68/EUMTC 3.1 / 3.2

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

Partner with RealBolt — India’s leading manufacturer of certified Inconel 625 Screws — 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
Email Us

Answers for Buyers

Inconel 625 Screws — Frequently Asked Questions

Browse expert answers to common questions about Inconel 625 Screws 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 screws selection and pricing.
Inconel 625 screws are available in socket head cap (DIN 912 / ISO 4762), button head socket (ISO 7380), countersunk socket (DIN 7991 / ISO 10642), pan head machine screw (ASME B18.6.3), hex head full thread (DIN 933), and cheese head configurations. Drive options include hex socket (Allen), Torx, Phillips, and slotted. Custom head styles and non-standard drive forms are available on request with a 15 working day lead time. All types are machined from ASTM B446 UNS N06625 bar stock.
Galling is a significant risk with nickel alloys due to their tendency to work-harden under friction. Always apply a nickel-based anti-seize compound (Molykote P-37, Bostik Never-Seez Pure Nickel, or equivalent) to both the thread flanks and the bearing face under the screw head before installation. Reduce target torque by 20% compared to dry values. Use a calibrated torque wrench and tighten in a single smooth motion – avoid back-and-forth ratcheting. Never use copper-based or zinc-based anti-seize on Inconel 625 screws as galvanic incompatibility will accelerate corrosion at the thread interface.
Yes – Inconel 625 retains excellent toughness and ductility at cryogenic temperatures down to -196°C (liquid nitrogen temperature). The austenitic nickel-based matrix does not undergo a ductile-to-brittle transition, unlike ferritic and martensitic steels. Inconel 625 screws are used in LNG plant cold box fastener applications, cryogenic valve bonnet connections, and liquid nitrogen storage vessel internals. No special low-temperature impact testing is required for alloy 625 at cryogenic service temperatures.
Inconel 625 screws maintain adequate mechanical properties up to 980°C in oxidising atmospheres. Above 650°C, creep relaxation becomes a design consideration and bolt load should be calculated using elevated-temperature yield data from ASME Section II Part D. For continuous service above 700°C, consider Inconel 718 or Waspaloy fasteners which offer superior creep resistance through precipitation hardening. Inconel 625 screws are well suited to intermittent high-temperature service such as exhaust flange connections and furnace door hardware where thermal cycling resistance is the primary requirement.

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