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ASTM A193 Grade B8 Threaded Rods Manufacturer & Exporter in India

Explore ASTM A193 Grade B8 Threaded Rods 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 Threaded Rods?

ASTM A193 Grade B8 threaded rods are high-strength fasteners manufactured from austenitic stainless steel, specifically Type 304 or 304L, and are designed for use in pressure vessels, valves, flanges, and fittings at high temperatures. These rods are solution-annealed and strain-hardened to achieve the required mechanical properties, offering excellent corrosion resistance and durability in both chemical and marine environments.

Grade B8 threaded rods are widely specified for bolting applications in the oil & gas, petrochemical, and power generation industries, where resistance to oxidation and chloride-induced corrosion is critical. All rods are produced to strict ASTM A193 standards, ensuring traceability, consistent performance, and compatibility with ASME and DIN bolting requirements.

Quick Specifications

MaterialStainless Steel 304/304L
UNS NumberS30400 / S30403
DIN Number1.4301 / 1.4307
Material StandardASTM A193 Grade B8
Rod Standard (Metric)DIN 975 / DIN 976
Rod Standard (Inch)ASME B18.31.3
Thread FormISO Metric / UNC / UNF
Diameter RangeM6-M64 / ¼"-2½"
Tensile Strength515 MPa (75 ksi) min
Yield Strength205 MPa (30 ksi) min
HardnessMax 223 HB / 95 HRB
? All rods supplied with EN 10204 3.1 certification. PMI and IGC test 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 Studs — 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 Studs

Technical Data

ASTM A193 Grade B8 Threaded Rods Dimensions, Sizes & Thread Standards

ASTM A193 Grade B8 Threaded Rods are available in metric M6–M100 and inch ¼″–4″ as standard. Per DIN 975 (full thread) / DIN 976 (studs) / ASME B18.31.3. Custom lengths available up to 6 meters. Inch and metric threads supplied as required.

Threaded Rod Dimensions - Metric (DIN 975)

Size (M)Pitch (mm)Core Dia (mm)Length Range (mm)
M61.04.8100-2000
M81.256.6100-3000
M101.58.2100-3000
M121.7510.0100-3000
M162.013.6100-3000
M202.517.0100-3000
M243.020.4100-3000
M303.526.4100-3000
M364.032.4100-3000
M424.538.4100-3000
M485.044.4100-3000
M565.552.4100-3000
M646.058.4100-3000

Dimensional & Material Standards

StandardCoversThread
DIN 975Threaded rods, full threadMetric
DIN 976Stud bolts, double endMetric
ASME B18.31.3Threaded rods, inchUNC/UNF
ASME B16.5Stud bolts for flangesUNC
Material StandardRequirement
ASTM A193 B8Stainless steel 304/304L
ASTM A320 B8Low temperature service
EN 10204 3.1Mill test certificate
EN 10204 3.2TPI-witnessed MTC

Material Chemistry

ASTM A193 Grade B8 Chemical Composition

ASTM A193 Grade B8 Threaded Rods 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 Grade B8

ElementComposition (%)
Chromium (Cr)18.0-20.0
Nickel (Ni)8.0-11.0
Carbon (C)0.08 max
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 spectro-tested and certified. IGC test and PMI available on request.

Why ASTM A193 Grade B8 Alloy Composition Matters for Threaded Rods

18–20% Chromium — Corrosion Resistance
The high chromium content forms a passive oxide layer, providing excellent resistance to atmospheric corrosion, most oxidizing acids, and chloride environments, making B8 rods ideal for outdoor and chemical plant use.
8–11% Nickel — Austenitic Structure
Nickel stabilizes the austenitic structure, ensuring ductility and toughness even at cryogenic temperatures. This is critical for threaded rods used in pressure vessels and piping systems.
Low Carbon — Intergranular Corrosion Resistance
Low carbon content (=0.08%) minimizes carbide precipitation during welding, reducing the risk of intergranular corrosion and ensuring long-term reliability in bolted joints.

Fastener Performance

ASTM A193 Grade B8 Threaded Rods Mechanical Properties & Torque Reference

The table below lists mechanical properties and torque reference for ASTM A193 Grade B8 Threaded Rods per ASTM. ASTM A193 Grade B8 threaded rods achieve 620 MPa tensile strength, with hardness, yield, and elongation values verified by NABL-accredited testing and reported in the EN 10204 MTC.

Rod SizeDry (Nm)Lubricated (Nm)Clamp Load (kN)
M12705625
M1617013650
M2034027280
M24590472120
M301200960200
M3621001680290
M4232002560400
M4847003760520
?? Anti-galling: Use molybdenum-based or PTFE anti-seize. Lubricated values assume K=0.16. Avoid assembly without lubrication to prevent thread galling.

Industry Applications

ASTM A193 Grade B8 Threaded Rods Applications — Industries & End Uses

ASTM A193 Grade B8 Threaded Rods 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 threaded rods are the standard for bolting pressure vessel closures, heat exchanger channel covers, and ASME B16.5/B16.47 flanged joints in refineries and gas processing plants. Their corrosion resistance and high-temperature stability make them ideal for sour and sweet service environments.
Used for reactor vessel nozzles, process piping supports, and equipment anchoring in chemical plants, B8 threaded rods withstand exposure to acids, alkalis, and chlorides, ensuring long-term reliability in aggressive process media.
Specified for bolting in desalination plants, water treatment tanks, and pump assemblies, these rods resist pitting and crevice corrosion in chloride-rich and humid environments, outperforming carbon steel alternatives.
B8 threaded rods are used for turbine casing bolting, HRSG ductwork, and boiler flange connections, providing strength and oxidation resistance at elevated temperatures in both fossil and renewable power plants.

ASTM A193 Grade B8 Threaded Rods Standards & International Certifications

ASTM A193 Grade B8 Threaded Rods 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 975 DIN 976-1 ASME B18.31.2 IS 1367 IS 1364 SAE J429
Certifications
ISO 9001:2015EN 10204 3.1PED 2014/68/EUNABL LabMTC 3.1 / 3.2

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

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

Browse expert answers to common questions about ASTM A193 Grade B8 Threaded Rods 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 threaded rods selection and pricing.
ASTM A193 Grade B8 threaded rods are available in ISO metric (DIN 975/976), UNC, and UNF thread forms. Inch threads are supplied per ASME B18.31.3. Custom thread pitches, left-hand threads, and special lengths can be manufactured on request with short lead times.
Use a high-quality molybdenum-based or PTFE anti-seize compound (such as Molykote 1000 or Loctite LB 8008) on threads and nut faces. This prevents galling and ensures consistent preload. Avoid copper-based anti-seize in chloride environments to prevent galvanic corrosion.
Yes – B8 threaded rods (Type 304/304L stainless) offer excellent resistance to atmospheric, marine, and many chemical environments. For highly aggressive or chloride-rich conditions, consider B8M (Type 316) for enhanced pitting resistance.
No MOQ for standard sizes (M10-M36) in stock – single rods can be supplied for urgent needs. Custom diameters or cut lengths may require a 10 kg minimum. Bulk 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
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  • Nagpur
  • Nashik
  • Navi Mumbai
  • Noida
  • Pune
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Countries We Export To:

  • US
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