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Incoloy 925 Bolts Manufacturer & Exporter in India

Explore Incoloy 925 Bolts 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 Incoloy 925 Bolts?

Incoloy 925 bolts are high-strength nickel-iron-chromium alloy fasteners manufactured from UNS N09925 bar stock in accordance with ASTM B805. The alloy is precipitation-hardened with titanium and aluminum, and further strengthened by molybdenum and copper additions, delivering a minimum tensile strength of 760 MPa in the age-hardened condition.

Incoloy 925 bolts are engineered for extreme resistance to chloride-induced pitting, crevice corrosion, and stress corrosion cracking, especially in sour (H2S) oilfield environments. They are fully compliant with NACE MR0175/ISO 15156 for critical subsea, wellhead, and downhole applications where both high mechanical strength and corrosion resistance are mandatory.

Quick Specifications

MaterialIncoloy 925
UNS NumberN09925
DIN Number2.4858
Material StandardASTM B805
Bolt Standard (Metric)DIN 931 / DIN 933 / ISO 4014
Bolt Standard (Inch)ASME B18.2.1
Thread FormISO Metric / UNC / UNF
Diameter RangeM6-M100 / ¼"-4"
Tensile Strength760 MPa (110 ksi) min
Yield Strength517 MPa (75 ksi) min
HardnessMax 35 HRC / 300 HB
? All material certified by NABL-accredited laboratory. PMI and hardness survey available on request.

Complete the Fastener Set

Other Incoloy 925 Fastener Products Available from RealBolt

RealBolt also manufactures the complete Incoloy 925 fastener range from certified iron-nickel-chromium alloy bar stock, including Incoloy 925 Nuts, Incoloy 925 Screws, Incoloy 925 Washers, Incoloy 925 Studs, and Incoloy 925 Threaded Rods. All Incoloy 925 fastener types are produced to ASTM with full EN 10204 MTC 3.1/3.2 documentation.
Incoloy 925 Nuts
Incoloy 925 Screws
Incoloy 925 Washers
Incoloy 925 Studs
Incoloy 925 Threaded Rods

Technical Data

Incoloy 925 Bolts Dimensions, Sizes & Thread Standards

Incoloy 925 Bolts are available in metric M6–M100 and inch ¼″–4″ as standard. Per DIN 931 (partial thread) / DIN 933 (full thread) / ISO 4014. Custom lengths in 5mm increments. Inch dimensions available per ASME B18.2.1. All Incoloy 925 bolts dimensions are verified against applicable DIN, ISO, and ASME

Hex Bolt Dimensions - Metric (DIN 931 / ISO 4014)

Size (M)Pitch (mm)A/F (mm)Head Ht (mm)Min L (mm)Max L (mm)
M61.0104.010200
M81.25135.312250
M101.5176.416300
M121.75197.520400
M162.02410.025500
M202.53012.530600
M243.03615.040600
M303.54618.750800
M364.05522.5601000
M424.56526.0801000
M485.07530.01001200
M565.58535.01201500
M646.09540.01402000
M726.010545.01602000
M806.011550.01802500
M1006.014563.02003000

Dimensional & Material Standards

StandardCoversThread
DIN 931Hex bolts, partial threadMetric
DIN 933Hex bolts, full threadMetric
ISO 4014Hex head screws, partialMetric
ISO 4017Hex head screws, fullMetric
ASME B18.2.1Hex & heavy hex boltsUNC/UNF
ASME B16.5Stud bolts for flangesUNC
MSS SP-75Stud bolts, high-pressureUNC
Material StandardRequirement
ASTM B805Bar/rod - UNS N09925
ASTM F467Fastener mechanical
NACE MR0175Sour service =35 HRC
EN 10204 3.1Mill test certificate
EN 10204 3.2TPI-witnessed MTC

Material Chemistry

Incoloy 925 Chemical Composition

Incoloy 925 Bolts are produced from an iron-nickel-chromium alloy with controlled nickel (30–46%), chromium (19–23%), and molybdenum content per ASTM. Nickel and chromium together resist high-temperature oxidation to 1093°C in 800H grades, while molybdenum and copper additions in Incoloy 825 provide sulfuric and phosphoric acid resistance.

Chemical Composition per ASTM B805

ElementComposition (%)
Nickel (Ni)38.0-46.0%
Chromium (Cr)19.5-23.5%
Iron (Fe)22.0-27.0%
Molybdenum (Mo)2.5-3.5%
Copper (Cu)1.5-3.0%
Titanium (Ti)1.9-2.4%
Aluminum (Al)0.1-0.5%
Manganese (Mn)1.0% max
Silicon (Si)0.5% max
Carbon (C)0.03% max
Sulfur (S)0.03% max
? All heats verified by NABL-accredited spectrometry. PMI available on request.

Why Incoloy 925 Alloy Composition Matters for Bolts

Ti + Al — Precipitation Hardening
Titanium and aluminum additions enable age-hardening, giving Incoloy 925 bolts high strength and excellent resistance to stress corrosion cracking in sour oilfield environments.
Mo + Cu — Localized Corrosion Resistance
Molybdenum and copper enhance resistance to pitting and crevice corrosion, especially in chloride-rich and reducing acid conditions, making these bolts ideal for subsea and downhole use.
Cr (19.5–23.5%) — Oxidation & General Corrosion
High chromium content ensures robust passivation and resistance to oxidizing acids, while nickel-iron matrix provides structural stability at elevated temperatures.

Fastener Performance

Incoloy 925 Bolts Mechanical Properties & Torque Reference

The table below lists mechanical properties and torque reference for Incoloy 925 Bolts per ASTM. Incoloy 925 bolts achieve 620 MPa tensile strength, with hardness, yield, and elongation values verified by NABL-accredited testing and reported in the EN 10204 MTC.

Bolt SizeDry (Nm)Lubricated (Nm)Clamp Load (kN)
M12927434
M1622017680
M20440352128
M24760608185
M3015201216295
M3626402112430
M4242003360590
M4862404992780
?? Anti-galling: Use nickel-based anti-seize (Molykote P-37). Lubricated values assume K=0.15. Never use copper-based anti-seize on nickel alloys.

Industry Applications

Incoloy 925 Bolts Applications — Industries & End Uses

Incoloy 925 Bolts from RealBolt are specified across petrochemical furnaces, chemical processing, nuclear, and power generation where very good corrosion resistance and 620 MPa tensile strength are required for reliable fastener performance. Click each industry below for detailed application examples.
Incoloy 925 stud bolts and nuts are the preferred choice for ASME B16.5/B16.47 flanged wellhead connections, subsea Christmas trees, and BOP stacks. Fully NACE MR0175 compliant for H2S sour service and chloride-rich environments. Approved by major oilfield operators for critical service.
Hex bolts and flange bolts for offshore platform riser clamps, splash-zone supports, and marine pump assemblies where resistance to pitting, crevice corrosion, and stress corrosion cracking is essential for long-term reliability.
Flange stud bolt sets for pressure vessel nozzles, heat exchanger covers, and reactor closures in environments containing sulfuric, phosphoric, or organic acids where stainless steel fasteners fail due to localized corrosion.
Incoloy 925 bolts are specified for downhole tool assemblies, packer mandrels, and completion hardware exposed to high-pressure, high-temperature (HPHT) and sour gas conditions. API 6A and ISO 15156 listed.

Incoloy 925 Bolts Standards & International Certifications

Incoloy 925 Bolts 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 931 DIN 933 ISO 4014 ISO 4017 ASME B18.2.1 IS 1364 IS 1367
Certifications
ISO 9001:2015NACE MR0175NABL LabPED 2014/68/EUMTC 3.1 / 3.2

Buy Incoloy 925 Bolts from India's Leading Manufacturer — Get a Competitive Quote Today

Partner with RealBolt — India’s leading manufacturer of certified Incoloy 925 Bolts — 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

Incoloy 925 Bolts — Frequently Asked Questions

Browse expert answers to common questions about Incoloy 925 Bolts from RealBolt — covering grade differences, ASTM B408/B425 standards, oxidation limits, acid resistance, sizes, and MTC documentation. Contact our technical team directly for project-specific guidance on Incoloy 925 bolts selection and pricing.
Incoloy 925 hex bolts are available to DIN 931 (metric partial thread), DIN 933 (metric full thread), ISO 4014/4017, and ASME B18.2.1 (inch hex and heavy hex). Stud bolts are supplied per ASME B16.5 or MSS SP-75 for flange applications. Custom thread forms (BSW, BSF, Whitworth, BSPP) can be manufactured on request with a typical 15 working day lead time.
Nickel-based anti-seize compound (such as Molykote P-37, Jet-Lube Pure Nickel, or Bostik Never-Seez Pure Nickel) is recommended. Apply to threads and nut bearing face. Reduce torque values by 20% for lubricated assembly. Never use copper-based or zinc-based anti-seize on nickel alloys due to galvanic corrosion risk.
Yes – Incoloy 925 is specifically engineered for sour (H2S) oilfield service and is fully compliant with NACE MR0175/ISO 15156. It is highly resistant to pitting, crevice corrosion, and stress corrosion cracking in seawater and subsea environments. No special coating or cathodic protection is required.
No formal MOQ for standard sizes (M12-M36) held ex-stock – we supply from single pieces for urgent maintenance. Custom sizes have an MOQ of 10 kg minimum. ASME B16.5 flange stud bolt sets are supplied by the set with no minimum. Quantity price breaks at 50 pcs, 200 pcs, and 500 pcs.

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