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Inconel 800 Screws Manufacturer & Exporter in India

Explore Inconel 800 Screws 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 800 Screws?

Inconel 800 screws are nickel-iron-chromium alloy fasteners manufactured from UNS N08800 bar stock conforming to ASTM B408. The alloy’s balanced composition of nickel (30-35%), chromium (19-23%), and iron (balance) delivers exceptional resistance to oxidation, carburization, and high-temperature creep, making it a preferred choice for elevated-temperature fastening applications.

With a minimum tensile strength of 517 MPa in the annealed condition, Inconel 800 screws maintain structural integrity at continuous service temperatures up to 815°C. They are widely specified under ASME Section VIII and NACE MR0175 for heat exchanger closures, furnace hardware, and petrochemical process equipment where standard stainless steel fasteners fail prematurely due to oxidation scaling and stress relaxation.

Quick Specifications

MaterialInconel 800
UNS NumberN08800
DIN Number1.4876
Material StandardASTM B408
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 RangeM4-M64 / #10-2½"
Tensile Strength517 MPa (75 ksi) min
Yield Strength207 MPa (30 ksi) min
HardnessMax 35 HRC / 200 HB
? All material certified by NABL-accredited laboratory. PMI available on request.

Complete the Fastener Set

Other Inconel 800 Fastener Products Available from RealBolt

RealBolt also manufactures the complete Inconel 800 fastener range from certified nickel-chromium superalloy bar stock, including Inconel 800 Bolts, Inconel 800 Nuts, Inconel 800 Washers, Inconel 800 Studs, and Inconel 800 Threaded Rods. All Inconel 800 fastener types are produced to ASTM with full EN 10204 MTC 3.1/3.2 documentation.
Inconel 800 Bolts
Inconel 800 Nuts
Inconel 800 Washers
Inconel 800 Studs
Inconel 800 Threaded Rods

Technical Data

Inconel 800 Screws Dimensions, Sizes & Thread Standards

Inconel 800 Screws are available in metric M6–M100 and inch ¼″–4″ as standard. Per DIN 912 (socket head cap screws) / DIN 933 (hex full thread) / ISO 4762. Custom lengths in 5mm increments. Inch dimensions available per ASME B18.3 and 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)Max L (mm)
M40.77.04.03.0100
M50.88.55.04.0150
M61.010.06.05.0200
M81.2513.08.06.0250
M101.516.010.08.0300
M121.7518.012.010.0400
M162.024.016.014.0500
M202.530.020.017.0600
M243.036.024.019.0600
M303.545.030.022.0800
M364.054.036.027.01000
M424.563.042.032.01000
M485.072.048.036.01200
M565.584.056.041.01500
M646.096.064.046.02000

Dimensional & Material Standards

StandardCoversThread
DIN 912Socket head cap screwsMetric
DIN 933Hex screws, full threadMetric
ISO 4762Socket head cap screwsMetric
ISO 4017Hex head screws, full threadMetric
ASME B18.3Socket cap & set screwsUNC/UNF
ASME B18.6.3Machine screwsUNC/UNF
DIN 7984Low-head socket cap screwsMetric
Material StandardRequirement
ASTM B408Bar/rod - UNS N08800
ASTM B409Plate/sheet - UNS N08800
ASTM F468Fastener mechanical properties
NACE MR0175Sour service =35 HRC
EN 10204 3.1Mill test certificate
EN 10204 3.2TPI-witnessed MTC

Material Chemistry

Inconel 800 Chemical Composition

Inconel 800 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 B408

ElementComposition (%)
Nickel (Ni)30.0-35.0%
Chromium (Cr)19.0-23.0%
Iron (Fe)Balance (min 39.5%)
Carbon (C)0.10% max
Aluminium (Al)0.15-0.60%
Titanium (Ti)0.15-0.60%
Manganese (Mn)1.50% max
Silicon (Si)1.00% max
Sulphur (S)0.015% max
Copper (Cu)0.75% max
? All heats verified by NABL-accredited spectrometry. PMI available on request.

Why Inconel 800 Alloy Composition Matters for Screws

Cr (19–23%) — High-Temperature Oxidation Resistance
Chromium forms a stable, adherent oxide layer on the screw surface at elevated temperatures, preventing scaling and metal loss in furnace atmospheres and combustion gas environments up to 815°C continuous service.
Ni (30–35%) — Carburization & Nitridation Resistance
The high nickel content of Inconel 800 provides outstanding resistance to carburization in hydrocarbon-rich atmospheres and nitridation in ammonia-bearing process streams — critical for screws used in ethylene cracker tube hangers and reformer hardware.
Al + Ti (0.15–0.60% each) — Creep Strength Retention
Aluminium and titanium additions stabilize the microstructure against grain boundary migration at sustained high temperatures, ensuring Inconel 800 screws resist stress relaxation and maintain clamping force in long-term elevated-temperature service without requiring retorquing.

Fastener Performance

Inconel 800 Screws Mechanical Properties & Torque Reference

The table below lists mechanical properties and torque reference for Inconel 800 Screws per ASTM. Inconel 800 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 800 Screws (Metric)

Screw SizeDry (Nm)Lubricated (Nm)Clamp Load (kN)
M6865
M8191511
M10383022
M12655237
M1616012872
M20315252113
M24545436163
M301090872260
?? 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-iron alloys - galvanic incompatibility accelerates thread corrosion at elevated temperatures.

Industry Applications

Inconel 800 Screws Applications — Industries & End Uses

Inconel 800 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 800 screws are the standard fastener for furnace muffle attachments, radiant tube supports, retort closures, and heat treatment basket assemblies. The alloy’s resistance to oxidation scaling and carburization at temperatures up to 815°C ensures screws remain removable after extended thermal cycling – a critical maintenance requirement in continuous annealing and carburizing furnace operations.
Socket head cap screws and hex screws in Inconel 800 are specified for ethylene cracker tube hanger connections, steam reformer pigtail fittings, and hydrocarbon pyrolysis reactor closures. The alloy resists carburization in methane and ethylene atmospheres where austenitic stainless steel fasteners suffer rapid carbon ingress and embrittlement within months of service.
Inconel 800 screws are used in high-pressure superheater header connections, steam drum internal attachment hardware, and boiler casing panel fastening where steam temperatures exceed 550°C. The alloy’s low thermal expansion mismatch with austenitic boiler tube materials reduces differential thermal stress at bolted joints during load cycling.
Flanged cover screws and inspection port fasteners in Inconel 800 are specified for nitric acid concentrators, caustic evaporators, and mixed acid service vessels where both high temperature and corrosive media are present simultaneously. The alloy outperforms 316L and 321 stainless steel in oxidizing acid environments above 200°C.

Inconel 800 Screws Standards & International Certifications

Inconel 800 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

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Partner with RealBolt — India’s leading manufacturer of certified Inconel 800 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.
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Answers for Buyers

Inconel 800 Screws — Frequently Asked Questions

Browse expert answers to common questions about Inconel 800 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 800 screws selection and pricing.
Inconel 800 screws are manufactured to DIN 912 (socket head cap screws, metric), DIN 933 (hex screws, full thread), ISO 4762 (socket head cap screws), and ASME B18.3 (socket cap and set screws, inch). Machine screws are available per ASME B18.6.3. Custom drive types including Torx, Phillips, and slotted heads are available on request with a 15 working day lead time. All screws are produced from ASTM B408 UNS N08800 bar stock with EN 10204 3.1 MTC as standard.
Inconel 800 screws are rated for continuous service up to 815°C in oxidizing atmospheres. In reducing or carburizing atmospheres, the practical limit is approximately 700°C before carbon ingress becomes a concern. For applications requiring higher temperature capability above 900°C, Inconel 800H (UNS N08810) or Inconel 800HT (UNS N08811) with controlled carbon and grain size should be specified. Contact our engineering team for alloy selection guidance based on your specific process atmosphere and temperature profile.
Yes – Inconel 800 (UNS N08800) is listed in NACE MR0175 / ISO 15156-3 for use in H2S-containing sour service environments, subject to a maximum hardness of 35 HRC. All screws are supplied with hardness survey results on the MTC. For sour service applications, specify solution-annealed condition and confirm H2S partial pressure and chloride concentration with our technical team to ensure the correct alloy and heat treatment condition is selected.
Inconel 800 (UNS N08800) is the standard grade with carbon controlled to 0.10% max, suitable for service up to 815°C. Inconel 800H (UNS N08810) has a tighter carbon range of 0.05-0.10% and a controlled grain size (ASTM No. 5 or coarser) for improved creep rupture strength above 600°C. Inconel 800HT (UNS N08811) adds tighter Al+Ti controls (0.85-1.20% combined) for maximum creep resistance above 700°C. For furnace hardware and reformer tube hangers above 750°C, 800HT screws are the preferred specification. We supply all three variants from certified bar stock.

Industrial Cities We Serve:

  • Ahmedabad
  • Aurangabad
  • Bengaluru
  • Chennai
  • Coimbatore
  • Faridabad
  • Gandhidham
  • Greater Noida
  • Gurugram
  • Hazira
  • Hosur
  • Hyderabad
  • Jamnagar
  • Jamshedpur
  • Ludhiana
  • Mumbai
  • Mundra
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  • Nagpur
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  • Navi Mumbai
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