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Metric Grade 10.9 Washers Manufacturer & Exporter in India

Explore Metric Grade 10.9 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 10.9 Washers?

Metric Grade 10.9 washers are high-strength carbon steel flat or structural washers manufactured to complement Grade 10.9 bolts and fasteners. Produced from medium carbon alloy steel, these washers are quenched and tempered to achieve a minimum tensile strength of 1040 MPa, ensuring reliable load distribution and resistance to embedding under high clamp loads.

Grade 10.9 washers are specified for use in critical bolted joints in automotive, heavy machinery, wind turbine, and structural steel applications where both high preload and vibration resistance are required. They conform to ISO 898-2 and DIN 125/127/6916 standards, and are typically supplied with a zinc-plated, hot-dip galvanized, or phosphate finish for enhanced corrosion protection.

Quick Specifications

MaterialAlloy Steel, Grade 10.9
StandardISO 898-2 / DIN 125 / DIN 127 / DIN 6916
Hardness32-39 HRC
Tensile Strength1040 MPa min
FinishZinc Plated / Hot Dip Galvanized / Phosphate
Washer TypeFlat, Spring, Structural
Diameter RangeM6-M64
Thickness Range1.6-8.0 mm
ApplicationsAutomotive, Structural Steel, 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 10.9 Fastener Products Available from RealBolt

RealBolt also manufactures the complete Metric Grade 10.9 fastener range from certified alloy steel bar stock, including Metric Grade 10.9 Bolts, Metric Grade 10.9 Nuts, Metric Grade 10.9 Screws, Metric Grade 10.9 Studs, and Metric Grade 10.9 Threaded Rods. All Metric Grade 10.9 fastener types are produced to ASTM with full EN 10204 MTC 3.1/3.2 documentation.
Metric Grade 10.9 Bolts
Metric Grade 10.9 Nuts
Metric Grade 10.9 Screws
Metric Grade 10.9 Studs
Metric Grade 10.9 Threaded Rods

Technical Data

Metric Grade 10.9 Washers Dimensions, Sizes & Thread Standards

Metric Grade 10.9 Washers are available in metric M6–M100 and inch ¼″–4″ as standard. Dimensions per DIN 125 (flat), DIN 127 (spring), and DIN 6916 (structural). Custom OD/ID and thickness available. Inch sizes per ASME B18.22.1 on request. All Metric Grade 10.9 washers dimensions conform to applicable DIN, ISO, and ASME B18 standards.

Flat Washer Dimensions - Metric (DIN 125)

Size (M)Inner Ø (mm)Outer Ø (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
DIN 6916High-strength structural washersMetric
ISO 7089Plain washersMetric
ISO 7090Chamfered washersMetric
ASME B18.22.1Plain & lock washersInch
Material StandardRequirement
ISO 898-2Mechanical properties
EN 14399-6Structural washers
EN 10204 3.1Mill test certificate
ISO 4042Coating requirements

Material Chemistry

Metric Grade 10.9 Chemical Composition

Metric Grade 10.9 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)0.20-0.50
Manganese (Mn)0.50-1.65
Phosphorus (P)0.035 max
Sulfur (S)0.035 max
Silicon (Si)0.15-0.55
Chromium (Cr)0.30 max
Nickel (Ni)0.40 max
Molybdenum (Mo)0.20 max
Boron (B)0.003 max
? All heats verified by spectrometry. Full chemical test reports supplied with each batch.

Why Metric Grade 10.9 Alloy Composition Matters for Washers

Carbon & Manganese — Strength & Toughness
The controlled carbon and manganese content ensures Grade 10.9 washers achieve high tensile strength and ductility, critical for resisting embedding and maintaining preload in high-strength bolted joints.
Silicon — Improved Tempering Response
Silicon enhances the tempering response, providing a balance of hardness and toughness after quenching and tempering, which is essential for reliable washer performance under dynamic loads.
Low Phosphorus & Sulfur — Crack Resistance
Strict limits on phosphorus and sulfur minimize the risk of brittle fracture and ensure the washers maintain integrity under cyclic loading and vibration.

Fastener Performance

Metric Grade 10.9 Washers Mechanical Properties & Hardness Reference

The table below lists mechanical properties and hardness reference for Metric Grade 10.9 Washers per ASTM. Metric Grade 10.9 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 Grade 10.9 washers with Grade 10.9 bolts/nuts to maintain joint integrity. Ensure proper surface finish and flatness for optimal load distribution.

Industry Applications

Metric Grade 10.9 Washers Applications — Industries & End Uses

Metric Grade 10.9 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 10.9 washers are widely used in automotive chassis, suspension, and engine assemblies to ensure high clamp load retention and prevent bolt embedding under dynamic loads. Essential for critical joints in trucks, buses, and off-road vehicles.
High-strength flat and structural washers are specified for use with Grade 10.9 bolts in steel building frames, bridges, and wind turbine towers, providing reliable load distribution and vibration resistance in preloaded bolted connections.
Used in mining, construction, and agricultural machinery, Grade 10.9 washers prevent surface damage and maintain preload in high-stress bolted joints subject to shock and vibration.
Metric Grade 10.9 washers are used in railway track assemblies, fastening systems, and rolling stock, where high strength and fatigue resistance are required for safety-critical bolted joints.

Metric Grade 10.9 Washers Standards & International Certifications

Metric Grade 10.9 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/EUCE Marking

Buy Metric Grade 10.9 Washers from India's Leading Manufacturer — Get a Competitive Quote Today

Partner with RealBolt — India’s leading manufacturer of certified Metric Grade 10.9 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 10.9 Washers — Frequently Asked Questions

Browse expert answers to common questions about Metric Grade 10.9 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 10.9 washers selection and pricing.
Metric Grade 10.9 washers are manufactured to ISO 898-2 for mechanical properties and DIN 125, DIN 127, or DIN 6916 for dimensions. Structural washers for preloaded bolted joints are supplied to EN 14399-6. Coatings conform to ISO 4042. Inch sizes are available to ASME B18.22.1.
It is not recommended to use Grade 10.9 carbon steel washers with stainless steel bolts in corrosive environments due to the risk of galvanic corrosion. For such applications, use stainless steel washers of equivalent strength or apply suitable isolation coatings.
Metric Grade 10.9 washers are available with zinc plating, hot-dip galvanizing (HDG), phosphate, or Geomet coatings. The finish should be selected based on the application’s corrosion protection requirements and compatibility with the bolted joint.
Standard sizes (M8-M36) are available ex-stock with no MOQ-single-piece orders are accepted for urgent needs. Custom sizes or finishes may require a minimum order of 10 kg or 500 pieces, depending on the specification.

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