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ASTM A193 Grade B8M Studs Manufacturer & Exporter in India

Explore ASTM A193 Grade B8M 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 B8M Studs?

ASTM A193 Grade B8M studs are high-performance threaded rods manufactured from austenitic stainless steel, specifically Type 316 or its variants, conforming to UNS S31600/S31603. These studs are solution-annealed and strain-hardened to deliver superior corrosion resistance and mechanical strength, making them ideal for critical bolted joints in chemical, petrochemical, and marine environments.

Grade B8M studs are widely specified for use in pressure vessels, piping, and flange connections where resistance to chlorides, acids, and seawater is essential. They are dual-certified to ASTM A193/A193M and are available in both Class 1 (annealed) and Class 2 (strain-hardened) conditions, ensuring reliable performance in demanding service conditions.

Quick Specifications

MaterialStainless Steel 316 / 316L
UNS NumberS31600 / S31603
DIN Number1.4401 / 1.4404
Material StandardASTM A193
Stud Standard (Metric)DIN 976 / ISO 898-1
Stud Standard (Inch)ASME B16.5 / B18.31.2
Thread FormISO Metric / UNC / UNF
Diameter RangeM6-M100 / ¼"-4"
Tensile Strength515 MPa (Class 1) / 760 MPa (Class 2)
Yield Strength205 MPa (Class 1) / 600 MPa (Class 2)
HardnessMax 223 HBW
? All material certified by NABL-accredited laboratory. PMI and ferrite testing available on request.

Complete the Fastener Set

Other ASTM A193 Grade B8M Fastener Products Available from RealBolt

RealBolt also manufactures the complete ASTM A193 Grade B8M fastener range — ASTM A193 Grade B8M Bolts, ASTM A193 Grade B8M Nuts, ASTM A193 Grade B8M Screws, ASTM A193 Grade B8M Washers, ASTM A193 Grade B8M 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 B8M Bolts
ASTM A193 Grade B8M Nuts
ASTM A193 Grade B8M Screws
ASTM A193 Grade B8M Washers
ASTM A193 Grade B8M Threaded Rods

Technical Data

ASTM A193 Grade B8M Studs Dimensions, Sizes & Thread Standards

ASTM A193 Grade B8M Studs are available in metric M6–M100 and inch ¼″–4″ as standard. Per DIN 976 (metric) / ASME B16.5 (inch) for stud bolts. Custom lengths in 5mm increments. Inch dimensions available per B18.31.2. All ASTM A193 Grade B8M studs dimensions are verified against applicable DIN, ISO, and

Stud Bolt Dimensions - Metric (DIN 976)

Size (M)Pitch (mm)Thread Length (mm)Min L (mm)Max L (mm)
M61.01820200
M81.252225250
M101.52630300
M121.753035400
M162.03840500
M202.54450600
M243.05460800
M303.566701000
M364.078801200
M424.5901001500
M485.01021202000
M565.51141402000
M646.01261602500
M726.01381802500
M806.01502003000
M1006.01802503000

Dimensional & Material Standards

StandardCoversThread
DIN 976Stud bolts, full threadMetric
ASME B16.5Stud bolts for flangesUNC
ASME B18.31.2Continuous thread studsUNC/UNF
ISO 898-1Mechanical propertiesMetric
Material StandardRequirement
ASTM A193Studs - UNS S31600/S31603
ASTM A194Heavy hex nuts - Grade 8M
EN 10204 3.1Mill test certificate
EN 10204 3.2TPI-witnessed MTC

Material Chemistry

ASTM A193 Grade B8M Chemical Composition

ASTM A193 Grade B8M 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 (Type 316)

ElementComposition (%)
Chromium (Cr)16.0-18.0
Nickel (Ni)10.0-14.0
Molybdenum (Mo)2.00-3.00
Manganese (Mn)2.00 max
Silicon (Si)1.00 max
Carbon (C)0.08 max
Phosphorus (P)0.045 max
Sulfur (S)0.030 max
Nitrogen (N)0.10 max
Iron (Fe)Balance
? All heats verified by NABL-accredited spectrometry. PMI and ferrite content available on request.

Why ASTM A193 Grade B8M Alloy Composition Matters for Studs

Molybdenum (2–3%) — Chloride & Acid Resistance
The addition of molybdenum in ASTM A193 Grade B8M studs significantly improves resistance to pitting and crevice corrosion in chloride-rich and acidic environments, making them ideal for marine and chemical plant applications.
Low Carbon Option — Weldability
Grade B8M is available in both standard and low carbon (316L) variants, ensuring excellent weldability and minimizing the risk of intergranular corrosion after welding, which is critical for pressure vessel and piping fabrication.
Austenitic Structure — Non-Magnetic
The fully austenitic microstructure of 316 stainless steel ensures non-magnetic properties and high ductility, even at cryogenic temperatures, making B8M studs suitable for a wide range of process conditions.

Fastener Performance

ASTM A193 Grade B8M Studs Mechanical Properties & Torque Reference

The table below lists mechanical properties and torque reference for ASTM A193 Grade B8M Studs per ASTM. ASTM A193 Grade B8M 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)
M12705628
M1617013657
M2034027289
M24590472128
M301200960210
M3621001680305
M4233002640420
M4848003840570
?? Anti-galling: Use molybdenum-based or PTFE anti-seize. Lubricated values assume K=0.16. Avoid stainless-on-stainless galling by always using lubrication.

Industry Applications

ASTM A193 Grade B8M Studs Applications — Industries & End Uses

ASTM A193 Grade B8M 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 B8M studs are the industry standard for bolting ASME B16.5 and B16.47 flanges in offshore platforms, refineries, and gas processing plants. Their resistance to chlorides and sour gas environments ensures long-term reliability in critical pressure boundary joints.
B8M studs are specified for reactor closures, heat exchanger channel covers, and process piping in acid, caustic, and mixed halide environments where 304/316L stainless steel is required for corrosion resistance and mechanical integrity.
Used for seawater intake flanges, pump assemblies, and pressure vessel nozzles in desalination plants and shipboard systems, B8M studs provide excellent resistance to pitting and crevice corrosion in saline environments.
Stud bolts for flue gas desulphurisation (FGD) scrubber internals, HRSG ducting, and steam turbine casing connections where high temperature and corrosive condensates demand 316 stainless steel fasteners.

ASTM A193 Grade B8M Studs Standards & International Certifications

ASTM A193 Grade B8M 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 LabEN 10204 3.1 / 3.2

Buy ASTM A193 Grade B8M Studs from India's Leading Manufacturer — Get a Competitive Quote Today

Partner with RealBolt — India’s leading manufacturer of certified ASTM A193 Grade B8M 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 B8M Studs — Frequently Asked Questions

Browse expert answers to common questions about ASTM A193 Grade B8M 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 B8M studs selection and pricing.
ASTM A193 Grade B8M studs are available to DIN 976 (metric full thread), ASME B16.5 (inch stud bolts for flanges), and ASME B18.31.2 (continuous thread studs). Custom thread forms such as BSW, BSF, and Whitworth are available on request with a typical lead time of 10-15 working days.
Use molybdenum-based or PTFE anti-seize compound (such as Molykote 1000 or Loctite LB 8008) on threads and nut faces to prevent galling. Lubricated torque values should be reduced by 20% compared to dry assembly. Avoid copper-based anti-seize to prevent galvanic corrosion with stainless steel.
Yes – ASTM A193 Grade B8M (Type 316) studs offer excellent resistance to pitting and crevice corrosion in seawater and saline environments, making them ideal for marine, desalination, and offshore applications. For prolonged immersion, ensure proper nut selection and anti-seize use to prevent galling.
No formal MOQ for standard sizes (M12-M36) held in stock – we supply from single pieces for urgent maintenance. Custom sizes or non-standard thread forms may require a minimum order of 10 kg. Quantity price breaks are available 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