+912267437972

+919022636025

enquiry@real-bolt.com

Contact Us

ASTM A193 Grade B8M Washers Manufacturer & Exporter in India

Explore ASTM A193 Grade B8M Washers Manufacturer & Exporter in India manufactured for demanding industrial applications with reliable strength, corrosion resistance and compliance with international standards.
Request a Quote
View Products

-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 Washers?

ASTM A193 Grade B8M washers are precision flat washers manufactured from austenitic stainless steel, specifically Type 316 (UNS S31600), and are designed for use with high-strength bolting in pressure vessels, valves, flanges, and piping systems. These washers provide excellent resistance to pitting, crevice corrosion, and chloride-induced stress corrosion cracking, making them ideal for aggressive chemical and marine environments.

Grade B8M washers are solution-annealed and strain-hardened to meet the mechanical requirements of ASTM A193, ensuring reliable performance in both cryogenic and elevated temperature applications. They are widely specified in oil & gas, petrochemical, power generation, and water treatment industries for critical bolted joints where corrosion resistance and mechanical integrity are paramount.

Quick Specifications

MaterialStainless Steel 316 (AISI 316)
UNS NumberS31600
DIN Number1.4401
Material StandardASTM A193 Grade B8M
Washer Standard (Metric)DIN 125 / DIN 127 / ISO 7089
Washer Standard (Inch)ASME B18.22.1
TypeFlat, Spring, Fender, Tab, Belleville
Size RangeM6-M100 / 1/4"-4"
HardnessHRB 95 max (solution annealed)
Corrosion ResistanceExcellent (chloride, acid, marine)
? All washers supplied with EN 10204 3.1 certification. Positive Material Identification (PMI) 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 Studs, 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 Studs
ASTM A193 Grade B8M Threaded Rods

Technical Data

ASTM A193 Grade B8M Washers Dimensions, Sizes & Thread Standards

ASTM A193 Grade B8M Washers are available in metric M6–M100 and inch ¼″–4″ as standard. Per DIN 125 (flat), DIN 127 (spring), ISO 7089, and ASME B18.22.1. Custom OD/ID and thickness available. Metric and inch sizes supplied as per project requirements.

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
M4850.0926.0
M5658.01058.0
M6466.01158.0
M7274.013010.0
M8082.014010.0
M100102.018012.0

Dimensional & Material Standards

StandardCoversType
DIN 125Flat washersMetric
DIN 127Spring lock washersMetric
ISO 7089Plain washersMetric
ASME B18.22.1Plain & lock washersInch
BS 4320Metric washersMetric
Material StandardRequirement
ASTM A193Grade B8M, solution annealed
ASTM A276Bar/rod - Type 316
ASTM A240Plate/sheet - Type 316
EN 10204 3.1Mill test certificate
EN 10204 3.2TPI-witnessed MTC

Material Chemistry

ASTM A193 Grade B8M Chemical Composition

ASTM A193 Grade B8M 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 B8M

ElementComposition (%)
Chromium (Cr)16.0-18.0
Nickel (Ni)10.0-14.0
Molybdenum (Mo)2.0-3.0
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
Iron (Fe)Balance
? All heats verified by spectrometry. Full traceability and PMI available on request.

Why ASTM A193 Grade B8M Alloy Composition Matters for Washers

Molybdenum (2–3%) — Chloride & Acid Resistance
The addition of molybdenum in ASTM A193 Grade B8M washers significantly enhances resistance to pitting and crevice corrosion in chloride-rich and acidic environments, outperforming standard 304/316 washers in marine and chemical service.
Low Carbon — Weldability & Intergranular Corrosion
Low carbon content ensures excellent weldability and prevents sensitization, making B8M washers suitable for use in welded assemblies without risk of intergranular attack.
Nickel & Chromium — General Corrosion Resistance
The high nickel and chromium content provides robust resistance to oxidation and general corrosion, ensuring long-term reliability in harsh industrial and offshore environments.

Fastener Performance

ASTM A193 Grade B8M Washers Mechanical Properties & Torque Reference

The table below lists mechanical properties and torque reference for ASTM A193 Grade B8M Washers per ASTM. ASTM A193 Grade B8M washers achieve 620 MPa tensile strength, with hardness, yield, and elongation values verified by NABL-accredited testing and reported in the EN 10204 MTC.

Bolt SizeRecommended Washer OD (mm)Recommended Washer Thickness (mm)
M12242.5
M16303.0
M20373.0
M24444.0
M30564.0
M36665.0
M42786.0
M48926.0
?? Installation: Always use washers with matching material to the bolt/nut for optimal corrosion resistance. Ensure flat, burr-free surfaces for uniform load distribution.

Industry Applications

ASTM A193 Grade B8M Washers Applications — Industries & End Uses

ASTM A193 Grade B8M 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 B8M washers are specified for flange joints, valve assemblies, and pressure vessel connections in offshore platforms, subsea pipelines, and FPSO topsides. Their resistance to chloride pitting and crevice corrosion ensures long-term integrity in splash zones and submerged environments.
Used in reactor closures, heat exchanger assemblies, and acid-handling piping systems, B8M washers provide reliable sealing and load distribution in aggressive chemical process environments where 304/316L washers may fail.
Washer sets for flue gas desulphurisation (FGD) scrubbers, cooling water intake structures, and HRSG ducting, where resistance to acidic condensates and brine is critical for bolted joint longevity.
ASTM A193 Grade B8M washers are used in desalination plants, RO skids, and water treatment facilities for flange and equipment mounting, providing superior corrosion resistance in high-chloride and brackish water service.

ASTM A193 Grade B8M Washers Standards & International Certifications

ASTM A193 Grade B8M 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 9001:2015PED 2014/68/EUNABL LabMTC 3.1 / 3.2

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

Partner with RealBolt — India’s leading manufacturer of certified ASTM A193 Grade B8M 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.
022-6743-7972
+91 90226 36025
Email Us

Answers for Buyers

ASTM A193 Grade B8M Washers — Frequently Asked Questions

Browse expert answers to common questions about ASTM A193 Grade B8M 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 B8M washers selection and pricing.
ASTM A193 Grade B8M washers are available to DIN 125 (flat), DIN 127 (spring), ISO 7089, ASME B18.22.1 (inch), and BS 4320 (metric). Custom OD, ID, and thickness can be supplied to project specifications. All washers are manufactured from solution-annealed AISI 316 stainless steel and supplied with full certification.
Yes – ASTM A193 Grade B8M washers, made from Type 316 stainless steel, offer excellent resistance to pitting and crevice corrosion in seawater, brine, and marine atmospheres. They are the preferred choice for offshore, shipbuilding, and desalination applications where 304/316L washers may not provide sufficient durability.
ASTM A193 Grade B8M washers can be used in continuous service up to 870°C (1600°F) and retain their mechanical properties at elevated temperatures. They are commonly specified for heat exchangers, boilers, and process equipment in power and chemical plants.
No formal MOQ for standard sizes (M6-M36) held in stock – we supply from single pieces for urgent requirements. Custom sizes or special types may require a minimum batch of 10 kg. Quantity price breaks are available at 100 pcs, 500 pcs, and 1000 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