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ASTM A193 Grade B7 Bolts Manufacturer & Exporter in India

Explore ASTM A193 Grade B7 Bolts 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 Bolts?

ASTM A193 Grade B7 bolts are high-strength alloy steel fasteners manufactured from quenched and tempered chromium-molybdenum steel, typically conforming to AISI 4140/4142. Designed for use in high-pressure and high-temperature bolted flange connections, these bolts deliver a minimum tensile strength of 860 MPa (125 ksi) and are widely specified for petrochemical, power generation, and oil & gas applications.

ASTM A193 B7 bolts are the industry standard for pressure vessel and piping flange bolting, offering reliable performance up to 450°C. They are supplied with full traceability, mechanical testing, and are compatible with ASTM A194 Grade 2H or 7 nuts for critical service.

Quick Specifications

MaterialAlloy Steel (AISI 4140/4142)
UNS NumberK11597
DIN Number1.7225
Material StandardASTM A193 Grade B7
Bolt Standard (Metric)DIN 931 / DIN 933 / ISO 898-1
Bolt Standard (Inch)ASME B18.2.1
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 and mechanical test reports included.

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 Nuts, ASTM A193 Grade B7 Screws, ASTM A193 Grade B7 Washers, ASTM A193 Grade B7 Studs, 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 Nuts
ASTM A193 Grade B7 Screws
ASTM A193 Grade B7 Washers
ASTM A193 Grade B7 Studs
ASTM A193 Grade B7 Threaded Rods

Technical Data

ASTM A193 Grade B7 Bolts Dimensions, Sizes & Thread Standards

ASTM A193 Grade B7 Bolts are available in metric M6–M100 and inch ¼″–4″ as standard. Per DIN 931 (partial thread) / DIN 933 (full thread) / ISO 898-1. Custom lengths in 5mm increments. Inch dimensions available per ASME B18.2.1 and B16.5 for stud bolts.

Hex Bolt Dimensions - Metric (DIN 931 / ISO 898-1)

Size (M)Pitch (mm)A/F (mm)Head Ht (mm)Min L (mm)Max L (mm)
M61.0104.010200
M81.25135.312250
M101.5176.416300
M121.75197.520400
M162.02410.025500
M202.53012.530600
M243.03615.040600
M303.54618.750800
M364.05522.5601000
M424.56526.0801000
M485.07530.01001200
M565.58535.01201500
M646.09540.01402000
M726.010545.01602000
M806.011550.01802500
M1006.014563.02003000

Dimensional & Material Standards

StandardCoversThread
DIN 931Hex bolts, partial threadMetric
DIN 933Hex bolts, full threadMetric
ISO 898-1Mechanical propertiesMetric
ASME B18.2.1Hex & heavy hex boltsUNC/UNF
ASME B16.5Stud bolts for flangesUNC
MSS SP-58Pipe support boltsUNC
Material StandardRequirement
ASTM A193B7 alloy steel, quenched & tempered
ASTM A320B7 for low temperature
ASTM A1942H/7 nuts for B7 bolts
EN 10204 3.1Mill test certificate
EN 10204 3.2TPI-witnessed MTC

Material Chemistry

ASTM A193 Grade B7 Chemical Composition

ASTM A193 Grade B7 Bolts 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

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)0.08 max
? All heats verified by NABL-accredited spectrometry. PMI and chemical test reports available on request.

Why ASTM A193 Grade B7 Alloy Composition Matters for Bolts

Cr-Mo Alloy — High Strength & Creep Resistance
Chromium and molybdenum additions provide B7 bolts with high tensile strength, improved hardenability, and resistance to softening at elevated temperatures, making them ideal for pressure vessel and flange bolting.
Controlled Carbon — Toughness & Ductility
The specified carbon range ensures a balance between strength and ductility, reducing the risk of brittle fracture under impact or thermal cycling.
Low P & S — Weldability & Cleanliness
Strict phosphorus and sulfur limits ensure weldability and minimize the risk of embrittlement or hot shortness, critical for reliable bolted joints in pressure systems.

Fastener Performance

ASTM A193 Grade B7 Bolts Mechanical Properties & Torque Reference

The table below lists mechanical properties and torque reference for ASTM A193 Grade B7 Bolts per ASTM. ASTM A193 Grade B7 bolts achieve 620 MPa tensile strength, with hardness, yield, and elongation values verified by NABL-accredited testing and reported in the EN 10204 MTC.

Bolt SizeDry (Nm)Lubricated (Nm)Clamp Load (kN)
M121108845
M1627021690
M20540432140
M24930744205
M3018501480320
M3632002560465
M4251004080650
M4875006000880
?? Anti-galling: Use molybdenum-based anti-seize (Molykote 1000). Lubricated values assume K=0.15. Avoid over-torquing to prevent thread galling.

Industry Applications

ASTM A193 Grade B7 Bolts Applications — Industries & End Uses

ASTM A193 Grade B7 Bolts 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 bolts are the default choice for ASME B16.5/B16.47 flange connections, pressure vessel closures, and heat exchanger channel covers in refineries, gas processing plants, and upstream oilfield installations. Compatible with ASTM A194 2H/7 nuts for critical service.
B7 bolts are used for steam turbine casing bolting, HRSG ductwork, and high-pressure piping in thermal and combined cycle power plants, offering reliable performance up to 450°C and resistance to thermal cycling.
Stud bolts and hex bolts for reactor closures, process piping, and pressure vessel manways in ammonia, urea, and ethylene plants, where high strength and moderate corrosion resistance are required.
Flange bolts for high-pressure pumps, filter housings, and desalination plant piping, where mechanical strength and cost-effectiveness are critical.

ASTM A193 Grade B7 Bolts Standards & International Certifications

ASTM A193 Grade B7 Bolts 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 931 DIN 933 DIN 960 DIN 961 DIN 6914 ISO 4014 ISO 4017 ISO 8676 ISO 8765 ASME B18.2.1 EN 14399 EN 15048 EN ISO 4014 EN ISO 4017 BS EN ISO 4014 BS 3692 BS 4190 IS 1363 IS 1364 IS 3757 SAE J429 UNI 5737 UNI 5739 CSN 021101 PN 82101
Certifications
ISO 9001:2015PED 2014/68/EUNABL LabEN 10204 3.1 / 3.2

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

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

Browse expert answers to common questions about ASTM A193 Grade B7 Bolts 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 bolts selection and pricing.
ASTM A193 Grade B7 bolts are available to DIN 931 (partial thread), DIN 933 (full thread), ISO 898-1, and ASME B18.2.1 (inch hex and heavy hex). Stud bolts are supplied per ASME B16.5 for flange bolting. Custom thread forms (BSW, BSF, Whitworth) can be supplied on request.
Use a molybdenum-based anti-seize compound (such as Molykote 1000 or Loctite LB 8012) on threads and nut faces. For lubricated assembly, reduce torque by 20% compared to dry values. Avoid copper-based anti-seize in chloride environments to prevent corrosion.
Yes – ASTM A193 B7 bolts are rated for continuous service up to 450°C (842°F). For higher temperatures or where creep resistance is critical, consider ASTM A193 B16 or stainless steel grades. For subzero service, use ASTM A320 Grade L7.
No MOQ for standard sizes (M12-M36) in stock – single pieces can be supplied for urgent needs. Custom sizes or coatings may require a minimum batch of 10 kg. Price breaks are available at 50, 200, and 500 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