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ASTM A325 Screws Manufacturer & Exporter in India

Explore ASTM A325 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 A325 Screws?

ASTM A325 screws are high-strength, heavy hex structural fasteners manufactured from medium carbon steel, quenched and tempered to achieve superior mechanical properties. Designed specifically for structural steel connections, these screws conform to ASTM A325, which governs their chemical composition, mechanical strength, and dimensional tolerances. ASTM A325 screws are widely used in steel building frames, bridges, and other critical load-bearing assemblies where high shear and tensile strength are essential.

Available in both Type 1 (carbon steel) and Type 3 (weathering steel), ASTM A325 screws are supplied with a heavy hex head and are typically paired with ASTM A563 nuts and F436 hardened washers for optimal joint integrity. Their robust design and strict quality standards make them the preferred choice for bolted structural connections in construction and infrastructure projects worldwide.

Quick Specifications

MaterialMedium Carbon Steel (Quenched & Tempered)
ASTM GradeA325
TypeType 1 (Carbon Steel), Type 3 (Weathering Steel)
Bolt Standard (Inch)ASME B18.2.6
Bolt Standard (Metric)ISO 7412
Thread FormUNC (Unified Coarse)
Diameter Range1/2"-1-1/2" (M12-M36)
Tensile Strength830 MPa (120 ksi) min
Yield Strength660 MPa (95 ksi) min
Hardness24-38 HRC
? All screws supplied with full mechanical and chemical test certification. Third-party inspection available.

Complete the Fastener Set

Other ASTM A325 Fastener Products Available from RealBolt

RealBolt also manufactures the complete ASTM A325 fastener range from certified alloy / carbon steel bar stock, including ASTM A325 Bolts, ASTM A325 Nuts, ASTM A325 Washers, ASTM A325 Studs, and ASTM A325 Threaded Rods. All ASTM A325 fastener types are produced to ASTM with full EN 10204 MTC 3.1/3.2 documentation.
ASTM A325 Bolts
ASTM A325 Nuts
ASTM A325 Washers
ASTM A325 Studs
ASTM A325 Threaded Rods

Technical Data

ASTM A325 Screws Dimensions, Sizes & Thread Standards

ASTM A325 Screws are available in metric M6–M100 and inch ¼″–4″ as standard. Per ASME B18.2.6 (inch series) and ISO 7412 (metric series). Custom lengths available in 1/4″ increments. Metric equivalents supplied on request. All ASTM A325 screws dimensions are verified against applicable DIN, ISO, and ASME B18 standards before

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)
1/2137/80.34416
5/8111-1/160.43018
3/4101-1/40.5161-1/48
7/891-7/160.6021-1/28
181-5/80.6881-3/48
1-1/871-13/160.77328
1-1/4720.8592-1/48
1-3/862-3/160.9452-1/28
1-1/262-3/81.0312-3/48

Dimensional & Material Standards

StandardCoversThread
ASME B18.2.6Heavy hex structural screwsUNC
ISO 7412Hexagon head screwsMetric
ASTM F3125High-strength structural boltsUNC/Metric
ASTM A563Heavy hex nutsUNC
ASTM F436Hardened washersUNC
Material StandardRequirement
ASTM A325Structural screws, quenched & tempered
ASTM F3125Unified structural bolt standard
EN 10204 3.1Mill test certificate
EN 10204 3.2TPI-witnessed MTC

Material Chemistry

ASTM A325 Chemical Composition

ASTM A325 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 A325

ElementComposition (%)
Carbon (C)0.25-0.58
Manganese (Mn)0.60-1.35
Phosphorus (P)0.048 max
Sulfur (S)0.058 max
Silicon (Si)0.15-0.35
Copper (Cu)0.35 max (Type 3 only)
Nickel (Ni)0.25-0.45 (Type 3 only)
Chromium (Cr)0.45-0.65 (Type 3 only)
Vanadium (V)0.03 max
? All heats tested and certified per ASTM A325. Full traceability and PMI available.

Why ASTM A325 Alloy Composition Matters for Screws

Medium Carbon Steel — Strength & Ductility
The controlled carbon and manganese content ensures high tensile and yield strength, while maintaining ductility for reliable installation and service in structural joints.
Type 3 Weathering Steel — Atmospheric Corrosion Resistance
Type 3 A325 screws contain copper, nickel, and chromium, forming a protective oxide layer that resists rust in exposed outdoor applications, reducing maintenance needs for bridges and towers.
Low Phosphorus & Sulfur — Improved Toughness
Strict limits on phosphorus and sulfur minimize the risk of embrittlement and cracking, ensuring the screws maintain integrity under dynamic loads and temperature fluctuations.

Fastener Performance

ASTM A325 Screws Mechanical Properties & Torque Reference

The table below lists mechanical properties and torque reference for ASTM A325 Screws per ASTM. ASTM A325 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)
1/2"1209538
5/8"23018561
3/4"41033090
7/8"660530125
1"1000800170
1-1/8"14501160225
1-1/4"20501640285
1-3/8"27002160350
1-1/2"35502840425
?? Anti-galling: Use zinc-based or molybdenum anti-seize for carbon steel. Lubricated values assume K=0.16. Always follow project torque procedures.

Industry Applications

ASTM A325 Screws Applications — Industries & End Uses

ASTM A325 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 A325 screws are the standard for bolted connections in highway and railway bridges, truss structures, and overpasses. Their high strength and reliability ensure long-term performance under dynamic and static loads, meeting AASHTO and DOT requirements.
Used for steel frame connections in high-rise buildings, warehouses, and industrial plants, ASTM A325 screws provide secure, vibration-resistant joints for columns, beams, and bracing members.
Heavy hex screws for lattice tower assembly, substation structures, and utility poles, where high shear and tensile strength are critical for wind and seismic resistance.
ASTM A325 screws are specified for wind turbine towers, solar panel support frames, and other renewable energy infrastructure requiring robust, fatigue-resistant fasteners.

ASTM A325 Screws Standards & International Certifications

ASTM A325 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 9001:2015CE MarkingEN 10204 3.1EN 10204 3.2PED 2014/68/EU

Buy ASTM A325 Screws from India's Leading Manufacturer — Get a Competitive Quote Today

Partner with RealBolt — India’s leading manufacturer of certified ASTM A325 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 A325 Screws — Frequently Asked Questions

Browse expert answers to common questions about ASTM A325 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 A325 screws selection and pricing.
ASTM A325 screws are covered by ASTM A325 (now superseded by ASTM F3125), ASME B18.2.6 for dimensions, and are typically paired with ASTM A563 nuts and ASTM F436 washers. Metric equivalents are available under ISO 7412 and EN 14399-4 for structural bolting assemblies.
Yes, ASTM A325 screws can be supplied hot-dip galvanized per ASTM F2329 or mechanically galvanized per ASTM B695. Galvanizing provides enhanced corrosion resistance for outdoor and exposed structural applications. Always use compatible nuts and washers for galvanized assemblies.
Type 1 screws are made from medium carbon steel and are suitable for most structural applications. Type 3 screws are made from weathering steel (with added copper, nickel, and chromium) and develop a protective oxide layer, making them ideal for exposed structures where atmospheric corrosion resistance is required.
No, ASTM A325 screws are designed for single-use in structural applications. Reusing these screws can compromise joint integrity and is not permitted by AISC and RCSC guidelines. Always use new screws for critical structural connections.

Industrial Cities We Serve:

  • Ahmedabad
  • Aurangabad
  • Bengaluru
  • Chennai
  • Coimbatore
  • Faridabad
  • Gandhidham
  • Greater Noida
  • Gurugram
  • Hazira
  • Hosur
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  • Jamnagar
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  • Ludhiana
  • Mumbai
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