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ASTM A193 Grade B8 Washers Manufacturer & Exporter in India

Explore ASTM A193 Grade B8 Washers 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 Washers?

ASTM A193 Grade B8 washers are precision flat washers manufactured from austenitic stainless steel, specifically Type 304 (UNS S30400), and are designed to provide reliable load distribution and corrosion resistance in bolted assemblies. These washers are produced in accordance with ASTM A193 and ASTM F436/F844 standards, ensuring compatibility with Grade B8 bolts and studs for high-pressure, high-temperature, and corrosive service environments.

Grade B8 washers are solution-annealed and carbide solution treated to optimize mechanical properties and prevent intergranular corrosion. They are widely specified for use in petrochemical, power generation, and process piping applications where both mechanical strength and resistance to atmospheric and chemical attack are critical.

Quick Specifications

MaterialStainless Steel 304 (AISI 304)
UNS NumberS30400
DIN Number1.4301
Material StandardASTM A193 Grade B8
Washer Standard (Metric)DIN 125 / DIN 127 / ISO 7089
Washer Standard (Inch)ASME B18.22.1 / ASTM F436
TypeFlat, Spring, Lock, Fender
Diameter RangeM6-M64 / 1/4"-2-1/2"
Tensile Strength515 MPa (75 ksi) min
Yield Strength205 MPa (30 ksi) min
HardnessMax 223 HB / 95 HRB
? All washers supplied with full traceability and laboratory certification. PMI and hardness testing 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 Studs, 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 Studs
ASTM A193 Grade B8 Threaded Rods

Technical Data

ASTM A193 Grade B8 Washers Dimensions, Sizes & Thread Standards

ASTM A193 Grade B8 Washers are available in metric M6–M100 and inch ¼″–4″ as standard. Per DIN 125 (flat), DIN 127 (spring), ISO 7089 (plain), and ASME B18.22.1 (inch). Custom OD/ID and thickness available. Metric and inch sizes in stock.

Flat Washer Dimensions - Metric (DIN 125 / ISO 7089)

Size (M)Inner Dia (mm)Outer Dia (mm)Thickness (mm)
M66.4121.6
M88.4161.6
M1010.5202.0
M1213.0242.5
M1617.0303.0
M2021.0373.0
M2425.0444.0
M3031.0564.0
M3637.0665.0
M4243.0786.0
M4849.0926.0
M5657.01058.0
M6465.01158.0

Dimensional & Material Standards

StandardCoversType
DIN 125Flat washersMetric
DIN 127Spring lock washersMetric
ISO 7089Plain washersMetric
ASME B18.22.1Plain & lock washersInch
ASTM F436Hardened washersInch
ASTM F844Non-hardened washersInch
Material StandardRequirement
ASTM A193Grade B8 stainless steel
ASTM A276Bar/rod for washers
ASTM F593Mechanical properties
EN 10204 3.1Mill test certificate
EN 10204 3.2TPI-witnessed MTC

Material Chemistry

ASTM A193 Grade B8 Chemical Composition

ASTM A193 Grade B8 Washers 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
Iron (Fe)Balance
? All heats spectro-tested and certified by NABL-accredited laboratory. PMI available on request.

Why ASTM A193 Grade B8 Alloy Composition Matters for Washers

Cr (18–20%) — Corrosion Resistance
High chromium content forms a passive oxide layer, protecting ASTM A193 Grade B8 washers from rust and chemical attack in process, marine, and atmospheric environments.
Ni (8–11%) — Ductility & Toughness
Nickel enhances ductility and toughness, ensuring washers maintain integrity under dynamic loads and thermal cycling, especially in flange and piping assemblies.
Low Carbon — Intergranular Corrosion Resistance
Low carbon content prevents carbide precipitation during welding or high-temperature service, maintaining corrosion resistance at washer edges and surfaces.

Fastener Performance

ASTM A193 Grade B8 Washers Mechanical Properties & Hardness Reference

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

Washer SizeRecommended Bolt SizeMax Hardness (HB)
M12M12223
M16M16223
M20M20223
M24M24223
M30M30223
M36M36223
M42M42223
M48M48223
?? Washer hardness must not exceed bolt hardness. Always match ASTM A193 Grade B8 washers with compatible B8 bolts and nuts for optimal joint performance.

Industry Applications

ASTM A193 Grade B8 Washers Applications — Industries & End Uses

ASTM A193 Grade B8 Washers 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 washers are standard for flange assemblies, valve connections, and process piping in refineries and petrochemical plants, providing corrosion resistance and reliable load distribution in high-temperature and aggressive chemical environments.
Used in steam turbine, HRSG, and boiler flange joints, these washers maintain integrity under thermal cycling and high-pressure service, preventing bolt embedment and joint relaxation.
Flat and spring washers for stainless steel piping, pump assemblies, and pressure vessels in desalination plants and water treatment facilities, where resistance to chlorides and moisture is essential.
ASTM A193 Grade B8 washers are specified for hygienic piping, tank, and equipment assemblies, ensuring non-contaminating, corrosion-resistant performance in washdown and process environments.

ASTM A193 Grade B8 Washers Standards & International Certifications

ASTM A193 Grade B8 Washers 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 125A DIN 126 DIN 127 DIN 128 DIN 433 DIN 434 DIN 436 DIN 440 DIN 6796 DIN 6797 DIN 9021 ISO 7089 ISO 7090 ISO 7091 ISO 7092 ISO 7093 ISO 7094 ASME B18.21.1 EN ISO 7089 BS 4320 IS 5372 IS 1367
Certifications
ISO 9001:2015NABL LabPED 2014/68/EUMTC 3.1 / 3.2

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

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

Browse expert answers to common questions about ASTM A193 Grade B8 Washers 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 washers selection and pricing.
ASTM A193 Grade B8 washers are available to DIN 125 (flat), DIN 127 (spring), ISO 7089 (plain), ASME B18.22.1 (inch), ASTM F436 (hardened), and ASTM F844 (non-hardened). Custom OD, ID, and thickness can be supplied to drawing or project specification.
Yes, ASTM A193 Grade B8 washers (Type 304) can be used with B8M bolts (Type 316) in non-critical applications, but for maximum corrosion resistance in chloride or marine environments, matching B8M washers are recommended.
Yes, Grade B8 washers are suitable for continuous service up to 870°C (1600°F), making them ideal for boiler, heat exchanger, and process piping applications. Always verify with project specifications for temperature limits.
No formal MOQ for standard sizes (M6-M36) held ex-stock – we supply from single pieces for urgent requirements. Custom sizes or special types may require a 10 kg minimum. Quantity price breaks at 100, 500, and 1000 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