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ASTM A490 Nuts Manufacturer & Exporter in India

Explore ASTM A490 Nuts 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 ASTM A490 Nuts?

ASTM A490 nuts are high-strength, heavy hex nuts manufactured from quenched and tempered alloy steel, specifically designed for use with ASTM A490 structural bolts in critical steel construction. These nuts are engineered to provide a secure, vibration-resistant fastening in high-load applications such as bridges, buildings, and heavy machinery.

ASTM A490 nuts are produced to strict mechanical and dimensional standards, ensuring compatibility with A490 bolts and compliance with AISC and RCSC requirements for structural bolting assemblies. Their high hardness and strength make them ideal for pre-tensioned and slip-critical connections in steel structures.

Quick Specifications

MaterialAlloy Steel, Quenched & Tempered
ASTM GradeA490
Nut TypeHeavy Hex Nut
Material StandardASTM A563 DH / ASTM A194 2H
Nut Standard (Metric)ISO 4032 / DIN 934
Nut Standard (Inch)ASME B18.2.2
Thread FormUNC / UNF / Metric Coarse
Size Range1/2"-1-1/2" (M12-M36)
Proof Load175 ksi (1207 MPa) min
HardnessRockwell C24-C38
FinishPlain, Zinc, Mechanical Galvanized
? All nuts supplied with full mechanical and chemical certification. Third-party inspection available.

Complete the Fastener Set

Other ASTM A490 Fastener Products Available from RealBolt

RealBolt also manufactures the complete ASTM A490 fastener range from certified alloy / carbon steel bar stock, including ASTM A490 Bolts, ASTM A490 Screws, ASTM A490 Washers, ASTM A490 Studs, and ASTM A490 Threaded Rods. All ASTM A490 fastener types are produced to ASTM with full EN 10204 MTC 3.1/3.2 documentation.
ASTM A490 Bolts
ASTM A490 Screws
ASTM A490 Washers
ASTM A490 Studs
ASTM A490 Threaded Rods

Technical Data

ASTM A490 Nuts Dimensions, Sizes & Thread Standards

ASTM A490 Nuts are available in metric M6–M100 and inch ¼″–4″ as standard. Per ASME B18.2.2 (inch series) and ISO 4032/DIN 934 (metric series). Custom thread pitches and coatings available on request. All ASTM A490 nuts dimensions are verified against applicable DIN, ISO, and ASME B18 standards before dispatch from

Heavy Hex Nut Dimensions - Inch Series (ASME B18.2.2)

Nominal Size (in)Width Across Flats (in)Height (in)Thread Pitch
1/20.8750.50013 UNC
5/81.0620.62511 UNC
3/41.2500.75010 UNC
7/81.4380.8759 UNC
11.6251.0008 UNC
1-1/81.8121.1257 UNC
1-1/42.0001.2507 UNC
1-3/82.1881.3756 UNC
1-1/22.3751.5006 UNC

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

Size (M)Width Across Flats (mm)Height (mm)Thread Pitch
M1218101.75
M1624132.0
M2030162.5
M2436193.0
M2741223.0
M3046243.5
M3655294.0

Dimensional & Material Standards

StandardCoversThread
ASME B18.2.2Heavy hex nuts (inch)UNC/UNF
ISO 4032Hex nuts (metric)Metric
DIN 934Hex nuts (metric)Metric
ASTM A563Carbon & alloy steel nutsUNC/UNF
ASTM A194High temp/pressure nutsUNC/UNF
Material StandardRequirement
ASTM A563 DHHeavy hex, quenched & tempered
ASTM A194 2HHeavy hex, high temp/pressure
EN 10204 3.1Mill test certificate
EN 10204 3.2TPI-witnessed MTC

Material Chemistry

ASTM A490 Nut Chemical Composition

ASTM A490 Nuts are manufactured from chromium-molybdenum alloy steel with Cr (0.8–1.1%), Mo (0.15–0.65%), and vanadium additions in B16 grades, controlled per ASTM and ASME SA-193. Cr-Mo additions raise hardenability and creep rupture strength for pressure vessel service; vanadium in B16 extends the allowable service temperature to 538°C.

Chemical Composition per ASTM A563 DH / ASTM A194 2H

ElementComposition (%)
Carbon (C)0.20-0.55
Manganese (Mn)0.60-1.35
Phosphorus (P)0.04 max
Sulfur (S)0.05 max
Silicon (Si)0.15-0.37
Chromium (Cr)0.30 max
Molybdenum (Mo)0.20 max
Copper (Cu)0.20 max
Nickel (Ni)0.20 max
? All heats verified by spectrometry. Full chemical test reports supplied with every batch.

Why ASTM A490 Alloy Composition Matters for Nuts

High Carbon & Manganese — Strength & Hardness
The elevated carbon and manganese content ensures the nuts achieve the high proof load and hardness required for structural bolting, providing reliable clamping force in critical connections.
Low Phosphorus & Sulfur — Ductility & Integrity
Strict limits on phosphorus and sulfur prevent embrittlement, ensuring the nuts maintain ductility and toughness under dynamic and impact loads.
Alloy Additions — Corrosion & Tempering
Small additions of chromium, molybdenum, copper, and nickel improve tempering response and resistance to atmospheric corrosion, extending service life in exposed structures.

Fastener Performance

ASTM A490 Nuts Mechanical Properties & Torque Reference

The table below lists mechanical properties and torque reference for ASTM A490 Nuts per ASTM. ASTM A490 nuts achieve 620 MPa tensile strength, with hardness, yield, and elongation values verified by NABL-accredited testing and reported in the EN 10204 MTC.

Nut SizeRecommended Torque (Nm)Proof Load (kN)
1/2"12038
5/8"23061
3/4"41090
7/8"660130
1"1000170
1-1/8"1450210
1-1/4"2050260
1-3/8"2700320
1-1/2"3500380
?? Lubrication: Use waxed or lubricated nuts for consistent tensioning. Torque values are for plain finish; adjust for coated nuts as per RCSC guidelines.

Industry Applications

ASTM A490 Nuts Applications — Industries & End Uses

ASTM A490 Nuts from RealBolt are specified across oil and gas pressure vessels, power generation, and petrochemical where very good corrosion resistance and 620 MPa tensile strength are required for reliable fastener performance. Click each industry below for detailed application examples.
ASTM A490 nuts are specified for use with A490 bolts in bridge girder splices, truss connections, and critical infrastructure joints where high pre-load and vibration resistance are essential for long-term safety and performance.
Heavy hex nuts for steel frame connections, column splices, and moment-resisting frames in skyscrapers and large commercial structures, ensuring structural integrity under wind and seismic loads.
Used in heavy machinery foundations, crane rails, and process equipment supports where high-strength bolting is required for dynamic and static loads.
ASTM A490 nuts are used in the assembly of roof trusses, cantilevered structures, and large-span steelwork in stadiums and arenas, providing secure, high-strength fastening.

ASTM A490 Nuts Standards & International Certifications

ASTM A490 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, hardness test certificate, dimensional inspection report, and proof load test records — available on request for all orders.
Standards
DIN 934 DIN 980 DIN 982 DIN 985 DIN 439 DIN 557 DIN 562 ISO 4032 ISO 7040 ASME B18.2.2 EN ISO 4032 BS EN ISO 4032 IS 1363 IS 1364 IS 6623 IS 3757 SAE J995 SAE J1199 UNI 5588 CSN 021123 PN 82144
Certifications
ISO 9001:2015EN 10204 3.1 / 3.2CE MarkingPED 2014/68/EUThird-Party Inspection

Buy ASTM A490 Nuts from India's Leading Manufacturer — Get a Competitive Quote Today

Partner with RealBolt — India’s leading manufacturer of certified ASTM A490 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

ASTM A490 Nuts — Frequently Asked Questions

Browse expert answers to common questions about ASTM A490 Nuts from RealBolt — covering ASTM A193 grade, proof load, creep ratings, cryogenic L7 limits, coating options, and EN 10204 documentation. Contact our technical team directly for project-specific guidance on ASTM A490 nuts selection and pricing.
ASTM A490 nuts are typically supplied as ASTM A563 DH or ASTM A194 2H heavy hex nuts, meeting ASME B18.2.2 for dimensions and thread form. Metric equivalents are available to ISO 4032 and DIN 934. All nuts are tested for proof load, hardness, and chemical composition as per ASTM and EN 10204 3.1/3.2 requirements.
ASTM A490 nuts are not recommended for hot-dip galvanizing due to the risk of hydrogen embrittlement in high-strength steel. Mechanical galvanizing or zinc flake coatings are preferred alternatives for corrosion protection. Always specify the required finish at the time of order for compliance with project specifications.
No, ASTM A490 nuts are designed for use with ASTM A490 bolts due to their higher strength and hardness. For ASTM A325 bolts, use ASTM A563 Grade DH or C nuts as specified. Mixing A490 nuts with A325 bolts can result in over-tightening and potential bolt failure.
Standard sizes (1/2″-1-1/2″) are available ex-stock with no formal MOQ – single pieces can be supplied for urgent requirements. Custom sizes or coatings may require a minimum order of 25 kg or 100 pieces. Quantity discounts apply at 100, 500, and 1000 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