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ASTM A325 Studs Manufacturer & Exporter in India

Explore ASTM A325 Studs 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 Studs?

ASTM A325 studs are high-strength, heavy hex structural fasteners manufactured from medium carbon steel, quenched and tempered to achieve a minimum tensile strength of 830 MPa (120 ksi). These studs are designed for critical bolted connections in steel structures, bridges, and buildings, where high preload and shear strength are essential. ASTM A325 covers both fully threaded and double-end stud configurations, typically supplied with heavy hex nuts and washers for optimal load distribution.

Available in Type 1 (carbon steel), Type 2 (withdrawn), and Type 3 (weathering steel), ASTM A325 studs are specified for slip-critical and bearing-type connections in accordance with AISC and RCSC guidelines. All fasteners are supplied with mechanical and chemical test certification per ASTM and EN 10204 3.1 standards.

Quick Specifications

MaterialMedium Carbon Steel (Quenched & Tempered)
ASTM GradeA325
TypeType 1 (Carbon Steel), Type 3 (Weathering Steel)
Stud StandardASTM A325 / ASME B18.2.1
Thread FormUNC (Unified Coarse) / Metric
Diameter Range1/2"-1-1/2" (M12-M36)
Tensile Strength830 MPa (120 ksi) min
Yield Strength660 MPa (95 ksi) min
Hardness24-38 HRC
? All batches tested by NABL-accredited laboratory. Full traceability and MTC 3.1 supplied.

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 Screws, ASTM A325 Washers, 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 Screws
ASTM A325 Washers
ASTM A325 Threaded Rods

Technical Data

ASTM A325 Studs Dimensions, Sizes & Thread Standards

ASTM A325 Studs are available in metric M6–M100 and inch ¼″–4″ as standard. Per ASME B18.2.1 (inch series) and ISO 898-1 (metric). Custom lengths available in 5mm or 1/4″ increments. Supplied with heavy hex nuts and washers per ASTM A563 and F436.

Stud Dimensions - Inch Series (ASTM A325 / ASME B18.2.1)

Stud Size (in)Thread (UNC)Body Diameter (in)Min Length (in)Max Length (in)
1/2130.500212
5/8110.625218
3/4100.750224
7/890.875236
181.000248
1-1/871.125248
1-1/471.250260
1-3/861.375272
1-1/261.500272

Dimensional & Material Standards

StandardCoversThread
ASTM A325Structural bolts & studsUNC/Metric
ASME B18.2.1Stud dimensions (inch)UNC
ISO 898-1Metric mechanical propsMetric
ASTM A563Heavy hex nutsUNC/Metric
ASTM F436Hardened washersUNC/Metric
Material StandardRequirement
ASTM A325Studs, bolts - quenched & tempered
ASTM A563Heavy hex nuts
ASTM F436Hardened washers
EN 10204 3.1Mill test certificate
EN 10204 3.2TPI-witnessed MTC

Material Chemistry

ASTM A325 Stud Chemical Composition

ASTM A325 Studs 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)0.60-0.90
Phosphorus (P)0.048 max
Sulfur (S)0.058 max
Silicon (Si)0.15-0.35
Copper (Cu)0.20-0.60 (Type 3 only)
Chromium (Cr)0.45-0.65 (Type 3 only)
Nickel (Ni)0.25-0.45 (Type 3 only)
? All heats verified by spectrometry. Full chemical test reports supplied with every batch.

Why ASTM A325 Alloy Composition Matters for Studs

Carbon & Manganese — Strength & Toughness
The controlled carbon and manganese content ensures high tensile and yield strength, while maintaining ductility for shock and vibration resistance in structural joints.
Type 3 Weathering Steel — Corrosion Resistance
Type 3 A325 studs contain copper, chromium, and nickel, forming a stable oxide layer for atmospheric corrosion resistance in exposed structures, eliminating the need for painting.
Low Phosphorus & Sulfur — Crack Resistance
Strict limits on phosphorus and sulfur reduce the risk of embrittlement and cracking, ensuring reliable performance in cyclically loaded connections.

Fastener Performance

ASTM A325 Studs Mechanical Properties & Torque Reference

The table below lists mechanical properties and torque reference for ASTM A325 Studs per ASTM. ASTM A325 studs achieve 620 MPa tensile strength, with hardness, yield, and elongation values verified by NABL-accredited testing and reported in the EN 10204 MTC.

Stud SizeDry (Nm)Lubricated (Nm)Clamp Load (kN)
1/2"1209038
5/8"23018061
3/4"41033090
7/8"660530125
1"1000800170
1-1/8"14501160210
1-1/4"20501640260
1-3/8"27002160320
1-1/2"35502840390
?? Anti-galling: Use molybdenum-based anti-seize for large diameter studs. Lubricated values assume K=0.16. Always follow AISC/RCSC tightening procedures for structural connections.

Industry Applications

ASTM A325 Studs Applications — Industries & End Uses

ASTM A325 Studs 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 studs are the primary fastener for bolted connections in highway and railway bridges, including girder splices, truss joints, and deck-to-beam assemblies. Their high strength and ductility ensure long-term reliability under dynamic loading and vibration.
Used for column splices, beam-to-column connections, and bracing joints in high-rise buildings, stadiums, and industrial structures. A325 studs provide the preload and slip resistance required for seismic and wind load conditions.
Critical for bolted joints in power transmission towers, telecommunication masts, and substation frameworks, where high shear and tensile strength are essential for safety and longevity.
A325 studs are specified for anchor bolt assemblies and flange connections in wind turbine towers and solar panel support structures, providing secure, vibration-resistant fastening in exposed environments.

ASTM A325 Studs Standards & International Certifications

ASTM A325 Studs 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 938 DIN 939 DIN 976-1 ASME B18.31.2 IS 1364 IS 1367 SAE J429
Certifications
ISO 9001:2015EN 15048NABL LabPED 2014/68/EUMTC 3.1 / 3.2

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

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

Browse expert answers to common questions about ASTM A325 Studs 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 studs selection and pricing.
ASTM A325 studs are available in Type 1 (plain carbon steel, hot-dip galvanized, or mechanically galvanized) and Type 3 (weathering steel for atmospheric corrosion resistance). Finishes include plain, zinc-plated, and hot-dip galvanized. Type 2 (low carbon martensitic steel) has been withdrawn from the standard.
ASTM A325 studs must be paired with heavy hex nuts conforming to ASTM A563 (Grade C or DH) and hardened washers per ASTM F436. This ensures proper load distribution and compliance with AISC/RCSC requirements for structural bolted connections.
No, ASTM A325 studs are designed for single-use only in structural applications. Reuse is not permitted by AISC or RCSC due to potential loss of preload and risk of fatigue failure. Always replace with new, certified fasteners for safety-critical connections.
Yes, ASTM A325 studs are specifically designed for slip-critical (friction-type) and bearing-type connections in steel structures. Proper surface preparation and installation torque are essential to achieve the required slip resistance.

Industrial Cities We Serve:

  • Ahmedabad
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  • Bengaluru
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