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ASTM A193 Grade B7 Studs Manufacturer & Exporter in India

Explore ASTM A193 Grade B7 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 A193 Grade B7 Studs?

ASTM A193 Grade B7 studs are high-strength alloy steel threaded rods manufactured from quenched and tempered chromium-molybdenum steel, typically conforming to AISI 4140/4142. Designed for bolting pressure vessels, valves, flanges, and fittings in high-temperature and high-pressure service, B7 studs deliver a minimum tensile strength of 860 MPa (125 ksi) and are the industry standard for petrochemical and power generation bolted joints.

These studs are supplied with rolled or cut threads in both metric and inch series, and are available as double-end, tap-end, and continuous-threaded rods. Each batch is heat-treated and tested per ASTM A193, with full traceability and certification to EN 10204 3.1 or 3.2 as required for critical applications.

Quick Specifications

MaterialAlloy Steel (AISI 4140/4142)
UNS NumberK11597
DIN Number1.7225
Material StandardASTM A193 Grade B7
Stud Standard (Metric)DIN 976-1 / ISO 898-1
Stud Standard (Inch)ASME B16.5 / B18.31.2
Thread FormISO Metric / UNC / UNF
Diameter RangeM6-M100 / ¼"-4"
Tensile Strength860 MPa (125 ksi) min
Yield Strength720 MPa (105 ksi) min
HardnessMax 35 HRC / 321 HB
? All material certified by NABL-accredited laboratory. Heat treatment charts and PMI available on request.

Complete the Fastener Set

Other ASTM A193 Grade B7 Fastener Products Available from RealBolt

RealBolt also manufactures the complete ASTM A193 Grade B7 fastener range — ASTM A193 Grade B7 Bolts, ASTM A193 Grade B7 Nuts, ASTM A193 Grade B7 Screws, ASTM A193 Grade B7 Washers, ASTM A193 Grade B7 Threaded Rods — from certified bar stock per ASTM with full EN 10204 MTC 3.1/3.2 documentation and fast Mumbai dispatch.
ASTM A193 Grade B7 Bolts
ASTM A193 Grade B7 Nuts
ASTM A193 Grade B7 Screws
ASTM A193 Grade B7 Washers
ASTM A193 Grade B7 Threaded Rods

Technical Data

ASTM A193 Grade B7 Studs Dimensions, Sizes & Thread Standards

ASTM A193 Grade B7 Studs are available in metric M6–M100 and inch ¼″–4″ as standard. Per DIN 976-1 (metric), ASME B16.5 (inch), and ISO 898-1. Custom lengths in 5mm increments. Inch dimensions available per ASME B18.31.2 and B16.5 for flange bolting.

Stud Bolt Dimensions - Metric (DIN 976-1)

Size (M)Pitch (mm)Thread Length (mm)Min L (mm)Max L (mm)
M81.252240300
M101.52650400
M121.753060500
M162.03870600
M202.54480800
M243.0541001000
M303.5661201200
M364.0781401500
M424.5901602000
M485.01021802500
M565.51142003000
M646.01262203500
M726.01382404000
M806.01502604500
M1006.01743005000

Dimensional & Material Standards

StandardCoversThread
DIN 976-1Threaded rods & studsMetric
ASME B16.5Stud bolts for flangesUNC
ASME B18.31.2Continuous thread studsUNC/UNF
ISO 898-1Mechanical propertiesMetric
BS 4882Petrochemical boltingMetric/UNC
Material StandardRequirement
ASTM A193 B7Alloy steel, quenched & tempered
ASTM A320 L7Low temp variant
EN 10204 3.1Mill test certificate
EN 10204 3.2TPI-witnessed MTC

Material Chemistry

ASTM A193 Grade B7 Chemical Composition

ASTM A193 Grade B7 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 A193 B7

ElementComposition (%)
Carbon (C)0.37-0.49%
Manganese (Mn)0.65-1.10%
Phosphorus (P)0.035% max
Sulfur (S)0.040% max
Silicon (Si)0.15-0.35%
Chromium (Cr)0.75-1.20%
Molybdenum (Mo)0.15-0.25%
Nickel (Ni)0.25% max
Copper (Cu)0.25% max
Vanadium (V)0.03% max
? All heats verified by NABL-accredited spectrometry. Full chemical test reports supplied with every batch.

Why ASTM A193 Grade B7 Alloy Composition Matters for Studs

Cr-Mo Alloy — High-Temperature Strength
Chromium and molybdenum additions provide ASTM A193 Grade B7 studs with excellent strength retention up to 450°C, making them ideal for steam, hydrocarbon, and process piping bolting.
Controlled Carbon — Toughness & Ductility
The specified carbon range ensures a balance of tensile strength and ductility, reducing the risk of brittle fracture in service and allowing for reliable tightening and re-torquing.
Low Phosphorus & Sulfur — Clean Steel
Strict limits on phosphorus and sulfur minimize the risk of embrittlement and improve the weldability and toughness of B7 studs, especially in critical flange and vessel applications.

Fastener Performance

ASTM A193 Grade B7 Studs Mechanical Properties & Torque Reference

The table below lists mechanical properties and torque reference for ASTM A193 Grade B7 Studs per ASTM. ASTM A193 Grade B7 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)
M12957638
M1623518878
M20460368122
M24800640176
M3016001280285
M3627502200410
M4243003440570
M4865005200750
?? Anti-galling: Use molybdenum-based anti-seize (Molykote 1000). Lubricated values assume K=0.16. Avoid copper-based anti-seize in chloride environments.

Industry Applications

ASTM A193 Grade B7 Studs Applications — Industries & End Uses

ASTM A193 Grade B7 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 A193 Grade B7 studs are the default choice for ASME B16.5/B16.47 flange bolting, pressure vessel closures, and heat exchanger channel covers in refineries, gas processing, and upstream oilfield installations. Supplied with 2H or Grade 7 nuts for high-pressure, high-temperature service.
Studs and nuts for steam turbine casing joints, HRSG ductwork, and boiler manway covers where high strength and temperature resistance are required. B7 is specified for both fossil and combined cycle plants.
Flange stud bolt sets for reactor vessels, process piping, and heat exchanger assemblies in ammonia, urea, and ethylene plants. B7 studs are compatible with a wide range of process media and are preferred for their mechanical reliability.
Used for high-pressure pump flanges, filter vessel closures, and pipeline connections in desalination and water treatment plants where strength and cost-effectiveness are critical.

ASTM A193 Grade B7 Studs Standards & International Certifications

ASTM A193 Grade B7 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 9001:2015PED 2014/68/EUNABL LabMTC 3.1 / 3.2

Buy ASTM A193 Grade B7 Studs from India's Leading Manufacturer — Get a Competitive Quote Today

Partner with RealBolt — India’s leading manufacturer of certified ASTM A193 Grade B7 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 A193 Grade B7 Studs — Frequently Asked Questions

Browse expert answers to common questions about ASTM A193 Grade B7 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 A193 Grade B7 studs selection and pricing.
ASTM A193 Grade B7 studs are available to DIN 976-1 (metric), ASME B16.5 (inch flange studs), ASME B18.31.2 (continuous thread), and ISO 898-1. Custom thread forms (BSW, BSF, Whitworth) and special lengths can be supplied on request with short lead times.
Use molybdenum-based anti-seize compound (such as Molykote 1000 or Loctite LB 8012) on threads and nut faces. This prevents galling and ensures accurate torque. Avoid copper-based anti-seize in chloride or seawater environments to prevent galvanic corrosion.
Yes – B7 studs are rated for continuous service up to 450°C (842°F) and are widely used in steam, hydrocarbon, and process piping. For temperatures below -29°C or above 450°C, consider ASTM A320 L7 or B16 grades for improved performance.
No formal MOQ for standard sizes (M12-M36) held ex-stock – we supply from single pieces for urgent maintenance. Custom sizes or special coatings may require a 10 kg minimum. Quantity price breaks at 50 pcs, 200 pcs, and 500 pcs.

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