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ASTM A490 Screws Manufacturer & Exporter in India

Explore ASTM A490 Screws 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 Screws?

ASTM A490 screws are high-strength, quenched and tempered alloy steel fasteners designed for structural bolting applications. Manufactured to meet the stringent requirements of ASTM A490, these screws deliver a minimum tensile strength of 150 ksi (1040 MPa) and are engineered for use in critical steel-to-steel connections in bridges, buildings, and heavy construction. ASTM A490 screws are available in both heavy hex and tension control (TC) head styles, with mechanical properties and dimensions tightly controlled for safety and reliability in pre-tensioned and slip-critical joints.

Unlike standard carbon steel bolts, ASTM A490 screws are not galvanized due to the risk of hydrogen embrittlement. Instead, they are supplied with a plain, zinc-aluminum, or mechanical coating for corrosion resistance. These screws are specified for demanding structural applications where maximum strength and performance are required.

Quick Specifications

MaterialAlloy Steel (Quenched & Tempered)
ASTM GradeA490
UNS NumberK10486 (typical)
Material StandardASTM A490
Screw Standard (Metric)ISO 898-1 Class 10.9 (equivalent)
Screw Standard (Inch)ASME B18.2.6
Thread FormUNC (Unified Coarse)
Diameter Range½"-1½" (M12-M36)
Tensile Strength150 ksi (1040 MPa) min
Yield Strength130 ksi (895 MPa) min
HardnessRockwell C 33-39
? All screws 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 Nuts, 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 Nuts
ASTM A490 Washers
ASTM A490 Studs
ASTM A490 Threaded Rods

Technical Data

ASTM A490 Screws Dimensions, Sizes & Thread Standards

ASTM A490 Screws are available in metric M6–M100 and inch ¼″–4″ as standard. Per ASME B18.2.6 (heavy hex structural screws) and ASTM A490. Custom lengths available in 5mm or ¼” increments. Metric equivalents per ISO 898-1 Class 10.9. All ASTM A490 screws dimensions conform to applicable DIN, ISO, and ASME B18 standards.

Heavy Hex Structural Screw Dimensions - Inch (ASME B18.2.6)

Nominal Size (in)Thread Pitch (TPI)Head Width (A/F, in)Head Height (in)Min Length (in)Max Length (in)
½13?0.53116
?111-1/160.65618
¾101-1/40.7811¼10
?91-7/160.9061½10
181-5/81.0311½10
1-1/871-13/161.156210
1-1/4721.281210
1-3/862-3/161.406210
1-1/262-3/81.531210

Dimensional & Material Standards

StandardCoversThread
ASTM A490Heavy hex structural screwsUNC
ASME B18.2.6Heavy hex screw dimensionsUNC
ISO 898-1Metric property class 10.9Metric
ASTM F3125Unified structural bolt standardUNC/Metric
EN 14399-4Preload structural boltsMetric
Material StandardRequirement
ASTM A490Alloy steel, quenched & tempered
ASTM F3125Mechanical properties
EN 10204 3.1Mill test certificate
EN 10204 3.2TPI-witnessed MTC

Material Chemistry

ASTM A490 Screw Chemical Composition

ASTM A490 Screws 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 A490

ElementComposition (%)
Carbon (C)0.26-0.55
Manganese (Mn)0.70-1.35
Phosphorus (P)0.035 max
Sulfur (S)0.040 max
Silicon (Si)0.15-0.35
Chromium (Cr)0.45 max
Nickel (Ni)0.25 max
Molybdenum (Mo)0.20 max
Boron (B)0.003 max
? All heats verified by spectrographic analysis. Full traceability provided with each batch.

Why ASTM A490 Alloy Composition Matters for Screws

High Carbon Content
The elevated carbon range (0.26–0.55%) enables the high tensile strength required for structural applications after quenching and tempering, ensuring reliable performance under heavy loads.
Controlled Alloying
Manganese, silicon, and trace elements are balanced to provide ductility and toughness, while limiting phosphorus and sulfur ensures resistance to embrittlement and cracking during installation.
No Galvanizing
ASTM A490 screws are not galvanized due to hydrogen embrittlement risk. Instead, mechanical or zinc-aluminum coatings are used for corrosion protection in exposed environments.

Fastener Performance

ASTM A490 Screws Mechanical Properties & Torque Reference

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

Screw SizeDry (Nm)Lubricated (Nm)Clamp Load (kN)
½"23018557
?"46037091
¾"820660133
?"13001040190
1"20001600254
1-1/8"29002320323
1-1/4"41003280399
1-3/8"55004400491
1-1/2"72005760588
?? Anti-galling: Use wax-based or MoS2 lubricant. Lubricated values assume K=0.15. Do not use copper-based anti-seize on structural alloy steel.

Industry Applications

ASTM A490 Screws Applications — Industries & End Uses

ASTM A490 Screws 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 screws are the standard for bolted connections in steel bridge construction, including girder splices, cross-frames, and truss joints. Their high strength ensures safety and durability in critical load-bearing applications, meeting AASHTO and DOT requirements.
Heavy hex screws for steel frame connections, column splices, and beam-to-column joints in high-rise towers, stadiums, and industrial buildings. Used where slip-critical or pre-tensioned joints are required for seismic and wind load resistance.
Structural screws for assembly of lattice towers, mobile cranes, wind turbine towers, and heavy machinery frames. Their high tensile strength and controlled ductility prevent joint failure under dynamic and cyclic loads.
ASTM A490 screws are specified for offshore oil platforms, marine terminals, and dockside cranes where high-strength, non-galvanized fasteners are required for structural integrity in harsh environments.

ASTM A490 Screws Standards & International Certifications

ASTM A490 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, hardness test certificate, dimensional inspection report, and proof load test records — available on request for all orders.
Standards
DIN 84 DIN 85 DIN 912 DIN 913 DIN 914 DIN 915 DIN 916 DIN 6912 DIN 7984 DIN 7985 DIN 7991 DIN 965 ISO 4762 ISO 10642 ISO 14579 ASME B18.3 ASME B18.6.3 EN ISO 4762 IS 1363 IS 1367 SAE J933 SAE J1199
Certifications
ISO 9001:2015EN 10204 3.1EN 10204 3.2CE MarkingPED 2014/68/EU

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

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

ASTM A490 Screws — Frequently Asked Questions

Browse expert answers to common questions about ASTM A490 Screws 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 screws selection and pricing.
ASTM A490 screws are covered by ASTM A490 (mechanical and chemical requirements), ASME B18.2.6 (dimensions), and ASTM F3125 (unified structural bolt standard). Metric equivalents are available per ISO 898-1 Class 10.9 and EN 14399-4 for preload applications.
ASTM A490 screws are not hot-dip galvanized due to hydrogen embrittlement risk. Available coatings include mechanical zinc, zinc-aluminum, and proprietary non-electrolytic coatings (e.g., Geomet, Magni). Plain finish is standard for indoor use.
Yes, ASTM A490 screws are specifically designed for slip-critical and pre-tensioned joints in structural steelwork. They provide the high clamp load and controlled ductility required for these demanding applications.
Standard sizes (½”-1¼”) are available ex-stock with no formal MOQ-single pieces can be supplied for urgent needs. Custom sizes or coatings may require a minimum order of 50-100 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