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ASTM A193 Grade B8 Studs Manufacturer & Exporter in India

Explore ASTM A193 Grade B8 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 B8 Studs?

ASTM A193 Grade B8 studs are high-strength stainless steel threaded rods manufactured from austenitic stainless steel, specifically Type 304 or 304L, conforming to ASTM A193 requirements. These studs are solution-annealed and strain-hardened to achieve enhanced mechanical properties, making them ideal for bolted connections in high-pressure, high-temperature, and corrosive environments.

Grade B8 studs are widely specified for use in petrochemical, power generation, and process piping applications, especially for ASME B16.5 and B16.47 flange connections. They offer excellent resistance to oxidation and general corrosion, and are available in both Class 1 (annealed) and Class 2 (strain-hardened) conditions to suit various service requirements.

Quick Specifications

MaterialStainless Steel 304/304L
UNS NumberS30400 / S30403
DIN Number1.4301 / 1.4307
Material StandardASTM A193
Stud Standard (Metric)DIN 976 / ISO 898-1
Stud Standard (Inch)ASME B16.5 / B16.47
Thread FormISO Metric / UNC / UNF
Diameter RangeM6-M100 / ¼"-4"
Tensile Strength515 MPa (75 ksi) min (Class 1)
Yield Strength205 MPa (30 ksi) min (Class 1)
HardnessMax 223 HB / 95 HRB
? All material certified by NABL-accredited laboratory. PMI and ferrite content available on request.

Complete the Fastener Set

Other ASTM A193 Grade B8 Fastener Products Available from RealBolt

RealBolt also manufactures the complete ASTM A193 Grade B8 fastener range — ASTM A193 Grade B8 Bolts, ASTM A193 Grade B8 Nuts, ASTM A193 Grade B8 Screws, ASTM A193 Grade B8 Washers, ASTM A193 Grade B8 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 B8 Bolts
ASTM A193 Grade B8 Nuts
ASTM A193 Grade B8 Screws
ASTM A193 Grade B8 Washers
ASTM A193 Grade B8 Threaded Rods

Technical Data

ASTM A193 Grade B8 Studs Dimensions, Sizes & Thread Standards

ASTM A193 Grade B8 Studs are available in metric M6–M100 and inch ¼″–4″ as standard. Per DIN 976 (metric) / ASME B16.5 (inch). Custom cut lengths available in 5mm increments. Inch dimensions per ASME B18.31.2 and B16.5 flange requirements. All ASTM A193 Grade B8 studs dimensions conform to applicable DIN, ISO, and ASME B18 standards.

Stud 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
M243.05460600
M303.56670800
M364.078801000
M424.590901000
M485.01021001200
M565.51141201500
M646.01261402000
M726.01381602000
M806.01501802500
M1006.01802003000

Dimensional & Material Standards

StandardCoversThread
DIN 976Threaded rods & studsMetric
ASME B16.5Stud bolts for flangesUNC
ASME B18.31.2Continuous threaded rodsUNC/UNF
ISO 898-1Mechanical propertiesMetric
MSS SP-58Pipe hanger studsUNC
Material StandardRequirement
ASTM A193Studs & rods - Grade B8
ASTM A194Heavy hex nuts - Grade 8
EN 10204 3.1Mill test certificate
EN 10204 3.2TPI-witnessed MTC

Material Chemistry

ASTM A193 Grade B8 Chemical Composition

ASTM A193 Grade B8 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 304/304L)

ElementComposition (%)
Chromium (Cr)18.0-20.0
Nickel (Ni)8.0-11.0
Carbon (C)0.08 max (304) / 0.035 max (304L)
Manganese (Mn)2.00 max
Silicon (Si)1.00 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 B8 Alloy Composition Matters for Studs

Cr (18–20%) — Corrosion Resistance
High chromium content ensures ASTM A193 Grade B8 studs resist oxidation and general corrosion in water, steam, and mild chemical environments, making them ideal for process piping and pressure vessels.
Ni (8–11%) — Austenitic Structure
Nickel stabilizes the austenitic structure, providing ductility and toughness even at cryogenic temperatures. This is critical for stud bolts used in fluctuating thermal conditions.
Low Carbon (0.08% max) — Weldability
Low carbon content in 304L minimizes carbide precipitation during welding, reducing the risk of intergranular corrosion at welded joints and ensuring long-term integrity of bolted assemblies.

Fastener Performance

ASTM A193 Grade B8 Studs Mechanical Properties & Torque Reference

The table below lists mechanical properties and torque reference for ASTM A193 Grade B8 Studs per ASTM. ASTM A193 Grade B8 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
M3621001680304
M4233002640418
M4848003840570
?? Anti-galling: Use molybdenum-based or PTFE anti-seize. Lubricated values assume K=0.16. Avoid dry assembly for large diameter stainless studs.

Industry Applications

ASTM A193 Grade B8 Studs Applications — Industries & End Uses

ASTM A193 Grade B8 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 B8 studs are the default choice for ASME B16.5/B16.47 flange connections in process piping, heat exchangers, and pressure vessels handling hydrocarbons, steam, and water. Resistant to chloride stress corrosion cracking in refinery atmospheres.
Stud bolts for steam drum manways, HRSG ducting, and turbine casing connections where high-temperature oxidation resistance and mechanical stability are required. Suitable for continuous service up to 870°C.
Used in desalination plant piping, RO skids, and water treatment vessels where corrosion resistance to chlorides and low maintenance are critical. Preferred for flange joints and valve assemblies.
Studs for reactor closures, acid storage tanks, and process piping in mild chemical environments. Grade B8 offers reliable performance in nitric acid, organic acid, and caustic service.

ASTM A193 Grade B8 Studs Standards & International Certifications

ASTM A193 Grade B8 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 B8 Studs from India's Leading Manufacturer — Get a Competitive Quote Today

Partner with RealBolt — India’s leading manufacturer of certified ASTM A193 Grade B8 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 B8 Studs — Frequently Asked Questions

Browse expert answers to common questions about ASTM A193 Grade B8 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 B8 studs selection and pricing.
ASTM A193 Grade B8 studs are supplied to DIN 976 (metric), ASME B16.5/B16.47 (inch flange studs), and ASME B18.31.2 (continuous threaded rods). Custom thread forms such as BSW, BSF, and Whitworth are available on request. All studs are supplied with full traceability and EN 10204 3.1 certification.
Use a 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 used for assembly. Avoid copper-based anti-seize to minimize galvanic corrosion with stainless steel.
Yes – ASTM A193 Grade B8 studs are suitable for continuous service up to 870°C (1600°F) and offer excellent oxidation resistance. For applications above 540°C, verify with engineering for possible carbide precipitation and consider low-carbon (304L) variants for welded assemblies.
No MOQ for standard sizes (M12-M36) available ex-stock. Custom cut lengths and non-standard diameters may require a minimum order of 10 kg. Flange stud bolt sets are supplied per set with no minimum. Quantity discounts apply 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
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  • Vadodara
  • Visakhapatnam

Countries We Export To:

  • US
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