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Metric Grade 8.8 Washers Manufacturer & Exporter in India

Explore Metric Grade 8.8 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 Metric Grade 8.8 Washers?

Metric Grade 8.8 washers are high-strength carbon steel flat washers manufactured to complement Grade 8.8 bolts and fasteners in structural and mechanical assemblies. These washers are produced from medium carbon steel, quenched and tempered to achieve a minimum tensile strength of 800 MPa and a yield strength of 640 MPa, as specified in ISO 898-1 and EN 14399-6 standards.

Grade 8.8 washers are designed to distribute load, prevent surface damage, and reduce the risk of bolt loosening under dynamic or vibrational loads. They are widely used in construction, automotive, heavy machinery, and general engineering applications where reliable clamping force and consistent preload are critical.

Quick Specifications

MaterialMedium Carbon Steel, Grade 8.8
StandardISO 7089 / ISO 7090 / DIN 125 / EN 14399-6
Hardness200-300 HV
Tensile Strength800 MPa min
Yield Strength640 MPa min
FinishPlain, Zinc Plated, Hot Dip Galvanized
Diameter RangeM6-M64
Thickness Range1.6-8.0 mm
ApplicationStructural, Automotive, Machinery
? All washers supplied with EN 10204 3.1 certification. Hardness and mechanical test reports available on request.

Complete the Fastener Set

Other Metric Grade 8.8 Fastener Products Available from RealBolt

RealBolt also manufactures the complete Metric Grade 8.8 fastener range from certified alloy steel bar stock, including Metric Grade 8.8 Bolts, Metric Grade 8.8 Nuts, Metric Grade 8.8 Screws, Metric Grade 8.8 Studs, and Metric Grade 8.8 Threaded Rods. All Metric Grade 8.8 fastener types are produced to ASTM with full EN 10204 MTC 3.1/3.2 documentation.
Metric Grade 8.8 Bolts
Metric Grade 8.8 Nuts
Metric Grade 8.8 Screws
Metric Grade 8.8 Studs
Metric Grade 8.8 Threaded Rods

Technical Data

Metric Grade 8.8 Washers Dimensions, Sizes & Thread Standards

Metric Grade 8.8 Washers are available in metric M6–M100 and inch ¼″–4″ as standard. Per ISO 7089 (plain washers), ISO 7090 (chamfered washers), DIN 125, and EN 14399-6 (structural washers). Custom OD/ID and thickness available on request. All Metric Grade 8.8 washers dimensions are verified against applicable DIN, ISO, and

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

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

StandardCoversThread
ISO 7089Plain washersMetric
ISO 7090Chamfered washersMetric
DIN 125Flat washersMetric
EN 14399-6Structural washersMetric
ASME B18.22.1Plain washers (inch)UNC/UNF
Material StandardRequirement
ISO 898-1Mechanical properties
EN 14399-6Structural bolting assemblies
EN 10204 3.1Mill test certificate
ISO 4042Coating requirements

Material Chemistry

Metric Grade 8.8 Washer Chemical Composition

Metric Grade 8.8 Washers are produced from medium-carbon or alloy steel with carbon (0.15–0.55%), chromium, manganese, and boron additions controlled per ASTM and ISO 898-1. Carbon content and quench-and-temper heat treatment are the primary strength levers, delivering proof loads from 580 MPa (Class 8.8) to 970 MPa (Class 12.9).

Chemical Composition per ISO 898-1

ElementComposition (%)
Carbon (C)0.25-0.55
Manganese (Mn)0.50-1.65
Phosphorus (P)0.035 max
Sulfur (S)0.035 max
Silicon (Si)0.10-0.50
Chromium (Cr)0.30 max
Nickel (Ni)0.30 max
Copper (Cu)0.25 max
Molybdenum (Mo)0.08 max
? All chemical analysis verified by NABL-accredited laboratory. Material traceability maintained for every batch.

Why Metric Grade 8.8 Alloy Composition Matters for Washers

Carbon & Manganese — Strength & Toughness
The controlled carbon and manganese content ensures Grade 8.8 washers achieve the required hardness and tensile strength, providing reliable load distribution and resistance to deformation under high clamping forces.
Low Phosphorus & Sulfur — Improved Ductility
Strict limits on phosphorus and sulfur minimize the risk of embrittlement and cracking, ensuring washers maintain ductility and toughness even after heat treatment.
Silicon — Enhanced Tempering Response
Silicon improves the steel’s response to tempering, resulting in a uniform microstructure and consistent mechanical properties across large production batches.

Fastener Performance

Metric Grade 8.8 Washers Mechanical Properties & Hardness Reference

The table below lists mechanical properties and hardness reference for Metric Grade 8.8 Washers per ASTM. Metric Grade 8.8 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)
M8161.6
M10202.0
M12242.5
M16303.0
M20373.0
M24444.0
M30564.0
M36665.0
?? Installation Tip: Always use washers with matching hardness and finish to the mating bolt/nut. For structural bolting, use EN 14399-6 washers for optimal load distribution.

Industry Applications

Metric Grade 8.8 Washers Applications — Industries & End Uses

Metric Grade 8.8 Washers from RealBolt are specified across structural engineering, automotive, machinery, and pressure vessels where very good corrosion resistance and 620 MPa tensile strength are required for reliable fastener performance. Click each industry below for detailed application examples.
Metric Grade 8.8 washers are specified for use with high-strength structural bolts in steel building frames, bridges, and heavy civil engineering projects. They ensure even load distribution and prevent bolt head/nut embedment into softer base materials.
Used in chassis, suspension, and engine mounting assemblies, Grade 8.8 washers provide reliable clamping and vibration resistance in automotive and commercial vehicle manufacturing.
Washers are used under anchor bolts and foundation bolts in heavy machinery installations, preventing surface damage and maintaining preload under dynamic loads.
Grade 8.8 washers are used in wind turbine towers, solar panel mounting systems, and other renewable energy structures where high-strength bolted joints are required.

Metric Grade 8.8 Washers Standards & International Certifications

Metric Grade 8.8 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 per ISO 4759, and proof load test records — available on request for all orders.
Standards
DIN 125A DIN 126 DIN 127 DIN 128 DIN 433 DIN 6796 DIN 6797 DIN 9021 ISO 7089 ISO 7090 ISO 7092 ISO 7093 ASME B18.21.1 EN ISO 7089 BS 4320 IS 5372 IS 1367
Certifications
ISO 9001:2015EN 10204 3.1PED 2014/68/EUNABL Lab

Buy Metric Grade 8.8 Washers from India's Leading Manufacturer — Get a Competitive Quote Today

Partner with RealBolt — India’s leading manufacturer of certified Metric Grade 8.8 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

Metric Grade 8.8 Washers — Frequently Asked Questions

Browse expert answers to common questions about Metric Grade 8.8 Washers from RealBolt — covering property class, tensile and proof load, galvanizing embrittlement risk, surface finishes, and dimensional certification. Contact our technical team directly for project-specific guidance on Metric Grade 8.8 washers selection and pricing.
Metric Grade 8.8 washers are covered by ISO 7089 (plain washers), ISO 7090 (chamfered washers), DIN 125 (flat washers), and EN 14399-6 (structural washers for preloaded bolting assemblies). For inch sizes, ASME B18.22.1 applies. Always match washer grade to the bolt grade for optimal performance.
Yes, but for outdoor or corrosive environments, specify zinc-plated or hot dip galvanized Grade 8.8 washers per ISO 4042 or EN 14399-6. For marine or highly corrosive applications, consider stainless steel or apply additional protective coatings.
Grade 8.8 washers can be used with Grade 10.9 bolts in non-critical applications, but for maximum joint integrity and to prevent washer deformation, use washers of equal or higher hardness (e.g., HV 300 or EN 14399-6 for structural bolting).
Standard sizes (M8-M24) are available ex-stock with no MOQ-single piece orders are accepted. For custom sizes or finishes, MOQ may apply (typically 10 kg or 500 pcs). Quantity discounts are available for bulk orders.

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