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Hastelloy C276 Screws Manufacturer & Exporter in India

Explore Hastelloy C276 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

1100

Max Temp

🌡

1100

Suitable for continuous service up to approximately 1100°C under typical operating conditions.

⚡

800

Typical tensile strength around 800 MPa depending on product form and heat treatment.

🛡

Excellent

Excellent corrosion resistance in a wide range of industrial environments.

⚖

8.9

Typical density is approximately 8.9 g/cm³.

Product Overview

What are Hastelloy C276 Screws?

Hastelloy C276 screws are nickel-molybdenum-chromium alloy fasteners machined from UNS N10276 bar stock conforming to ASTM B574. The alloy’s exceptional corrosion resistance stems from its high molybdenum content (15-17%) and tungsten addition (3-4.5%), which together suppress pitting, crevice corrosion, and stress corrosion cracking across a broad spectrum of aggressive chemical environments.

With a PREN exceeding 70, Hastelloy C276 screws outperform every standard stainless steel and most nickel alloys in oxidising and reducing acid service. They are routinely specified under NACE MR0175/ISO 15156 for chemical process equipment, FGD scrubbers, pharmaceutical reactors, and offshore installations where fastener corrosion failure is not an acceptable risk.

Quick Specifications

MaterialHastelloy C276
UNS NumberN10276
DIN Number2.4819
Material StandardASTM B574
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 Strength690 MPa (100 ksi) min
Yield Strength283 MPa (41 ksi) min
HardnessMax 35 HRC / 241 HB
? All material certified by NABL-accredited laboratory. PMI available on request.

Complete the Fastener Set

Other Hastelloy C276 Fastener Products Available from RealBolt

RealBolt also manufactures the complete Hastelloy C276 fastener range from certified nickel-molybdenum-chromium superalloy bar stock, including Hastelloy C276 Bolts, Hastelloy C276 Nuts, Hastelloy C276 Washers, Hastelloy C276 Studs, and Hastelloy C276 Threaded Rods. All Hastelloy C276 fastener types are produced to ASTM with full EN 10204 MTC 3.1/3.2 documentation.
Hastelloy C276 Bolts
Hastelloy C276 Nuts
Hastelloy C276 Washers
Hastelloy C276 Studs
Hastelloy C276 Threaded Rods

Technical Data

Hastelloy C276 Screws Dimensions, Sizes & Thread Standards

Hastelloy C276 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)
M30.55.53.02.550
M40.77.04.03.080
M50.88.55.04.0100
M61.010.06.05.0150
M81.2513.08.06.0200
M101.516.010.08.0250
M121.7518.012.010.0300
M162.024.016.014.0400
M202.530.020.017.0500
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 7380Button head socket screwsMetric
ASME B18.3Socket head cap screwsUNC/UNF
ASME B18.6.3Machine screwsUNC/UNF
DIN 7991Countersunk socket screwsMetric
Material StandardRequirement
ASTM B574Bar/rod - UNS N10276
ASTM F468Fastener mechanical properties
NACE MR0175Sour service =35 HRC
EN 10204 3.1Mill test certificate
EN 10204 3.2TPI-witnessed MTC

Material Chemistry

Hastelloy C276 Chemical Composition

Hastelloy C276 Screws derive their exceptional acid corrosion resistance from a precisely controlled nickel-molybdenum-chromium composition per ASTM. High molybdenum and tungsten content suppresses pitting and reducing-acid attack; ultra-low carbon (0.01% max) eliminates sensitization risk in welded assemblies. Full elemental composition is certified in the EN 10204 MTC supplied with every Hastelloy C276 screws order from RealBolt.

Chemical Composition per ASTM B574

ElementComposition (%)
Nickel (Ni)Balance (approx. 57% min)
Molybdenum (Mo)15.0-17.0%
Chromium (Cr)14.5-16.5%
Iron (Fe)4.0-7.0%
Tungsten (W)3.0-4.5%
Cobalt (Co)2.5% max
Manganese (Mn)1.0% max
Carbon (C)0.01% max
Silicon (Si)0.08% max
Vanadium (V)0.35% max
? All heats verified by NABL-accredited spectrometry. PMI available on request.

Why Hastelloy C276 Alloy Composition Matters for Screws

Mo (15–17%) + W (3–4.5%) — Dual Reducing Acid Resistance
The combined molybdenum and tungsten content gives Hastelloy C276 screws outstanding resistance to both reducing acids (HCl, H2SO4) and oxidising media. This dual protection is critical for screws used in chemical reactor closures and heat exchanger covers where process chemistry can shift between oxidising and reducing conditions.
Ultra-Low Carbon (0.01% max) — No Sensitisation Risk
The extremely low carbon ceiling eliminates carbide precipitation at grain boundaries during welding or elevated-temperature service. Hastelloy C276 screws retain full corrosion resistance in the heat-affected zone without any post-weld heat treatment, making them ideal for welded assemblies in aggressive chemical plant.
Cr (14.5–16.5%) — Oxidising Environment Stability
Chromium provides a stable passive film in mildly oxidising environments and wet chlorine service. Combined with the high Mo content, this gives C276 screws a PREN exceeding 70 — far beyond the threshold required for long-term seawater and halide resistance without coating or cathodic protection.

Fastener Performance

Hastelloy C276 Screws Mechanical Properties & Torque Reference

The table below lists mechanical properties and torque reference for Hastelloy C276 Screws per ASTM. Hastelloy C276 screws achieve 800 MPa tensile strength, with hardness, yield, and elongation values verified by NABL-accredited testing and reported in the EN 10204 MTC.

Tightening Torque Reference - Hastelloy C276 Screws

Screw SizeDry (Nm)Lubricated (Nm)Clamp Load (kN)
M6976
M8221812
M10443522
M12766136
M1618514868
M20365292107
M24630504155
M3012601008246
?? Anti-galling: Use nickel-based anti-seize (Molykote P-37 or Bostik Never-Seez Pure Nickel). Lubricated values assume K=0.15. Never use copper-based anti-seize on nickel alloys - galvanic corrosion risk.

Industry Applications

Hastelloy C276 Screws Applications — Industries & End Uses

Hastelloy C276 Screws from RealBolt are specified across chemical processing, pharmaceutical, oil and gas, and FGD where excellent corrosion resistance and 800 MPa tensile strength are required for reliable fastener performance. Click each industry below for detailed application examples. Select an industry below to see specific Hastelloy C276 screws application details and RealBolt stock availability.
Hastelloy C276 socket head cap screws and machine screws are the standard fastener choice for chemical reactor closure flanges, agitator shaft seals, and pressure vessel nozzle covers handling hydrochloric acid, sulphuric acid, phosphoric acid, and mixed halide streams. NACE MR0175 compliant for sour service environments.
FGD scrubber internals, absorber tower spray headers, and ductwork connection flanges are routinely fastened with Hastelloy C276 screws. The combination of wet HCl, SO2, and chloride-bearing condensate at elevated temperatures eliminates stainless steel and duplex options – C276 is the industry-standard specification for this service.
Hastelloy C276 screws are specified for pharmaceutical reactor vessel closures, filter press assemblies, and high-purity process pipework connections where FDA-compliant materials, zero contamination risk, and resistance to aggressive cleaning agents (CIP/SIP) are mandatory. Surface finish to Ra 0.8 µm available on request.
Seawater cooling system flanges, heat exchanger water box covers, and offshore structural connections in splash zones are secured with Hastelloy C276 screws where PREN 70+ is required. Immune to crevice corrosion under screw heads and washers in full seawater immersion – no coating or cathodic protection required.

Hastelloy C276 Screws Standards & International Certifications

Hastelloy C276 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 Hastelloy C276 Screws from India's Leading Manufacturer — Get a Competitive Quote Today

Partner with RealBolt — India’s leading manufacturer of certified Hastelloy C276 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

Hastelloy C276 Screws — Frequently Asked Questions

Browse expert answers to common questions about Hastelloy C276 Screws from RealBolt — covering acid corrosion resistance, NACE MR0175 compliance, ASTM standards, available sizes, and MTC documentation. Contact our technical team directly for project-specific guidance on Hastelloy C276 screws selection and pricing.
Hastelloy C276 screws are available in socket head cap screws (DIN 912 / ISO 4762), countersunk socket screws (DIN 7991), button head socket screws (ISO 7380), hex head machine screws (DIN 933), pan head machine screws (ASME B18.6.3), and set screws (DIN 913/914/916). Inch sizes are manufactured per ASME B18.3 for socket head types and ASME B18.6.3 for machine screws. Custom drive types including Torx, Phillips, and slotted are available on request with 15 working day lead time.
Yes – Hastelloy C276 is one of the few alloys with proven resistance to hydrochloric acid across a wide concentration and temperature range. The high molybdenum content (15-17%) combined with tungsten (3-4.5%) provides exceptional resistance to reducing acids including HCl at concentrations up to 37% at ambient temperature, and at elevated temperatures in dilute concentrations. C276 screws are routinely specified for HCl reactor closures, acid storage vessel nozzles, and pickling tank hardware where stainless steel and even higher-alloy grades fail rapidly.
Hastelloy C276 screws can be used continuously up to 1038°C in oxidising atmospheres and up to approximately 760°C in reducing atmospheres. Above 500°C, precipitation of secondary phases can begin to affect corrosion resistance in certain environments – for sustained high-temperature service above this threshold, consult our engineering team for heat treatment and application review. For cryogenic applications, C276 maintains excellent toughness and ductility down to -196°C, making it suitable for LNG and cryogenic process equipment fastening.
Yes – Hastelloy C276 meets the hardness requirement of =35 HRC specified in NACE MR0175/ISO 15156 for nickel alloy fasteners in H2S-containing sour service environments. All screws are supplied with hardness survey results on the MTC. For critical sour service applications requiring TPI-witnessed certification, EN 10204 3.2 MTCs are available. C276 is listed in NACE MR0175 Table A-3 as an acceptable material for sour service fasteners without restriction on H2S partial pressure.

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