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Metric Grade 12.9 Washers Manufacturer & Exporter in India

Explore Metric Grade 12.9 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 12.9 Washers?

Metric Grade 12.9 washers are high-strength carbon alloy steel flat washers engineered to provide optimal load distribution and surface protection in bolted assemblies using Grade 12.9 fasteners. Manufactured to ISO 898-2 and DIN 125/127/6916 standards, these washers are heat-treated and tempered to achieve a minimum hardness of 39 HRC, ensuring compatibility with Grade 12.9 bolts and screws in critical applications.

With a tensile strength of 1220 MPa and superior resistance to embedding and deformation, Metric Grade 12.9 washers are specified for heavy-duty mechanical, structural, and automotive joints where maximum preload and vibration resistance are essential. All washers are supplied with black oxide or zinc plating for enhanced corrosion protection.

Quick Specifications

MaterialAlloy Steel (Grade 12.9)
StandardISO 898-2 / DIN 125 / DIN 127 / DIN 6916
Hardness39-44 HRC
Tensile Strength1220 MPa min
Washer TypeFlat, Spring, Structural
FinishBlack Oxide / Zinc Plated
Diameter RangeM6-M64
Thickness Range1.6-8.0 mm
ApplicationHigh-strength bolted joints
CertificationEN 10204 3.1 / 3.2
? All washers batch-tested for hardness and mechanical properties. Full traceability and MTC supplied.

Complete the Fastener Set

Other Metric Grade 12.9 Fastener Products Available from RealBolt

RealBolt also manufactures the complete Metric Grade 12.9 fastener range from certified alloy steel bar stock, including Metric Grade 12.9 Bolts, Metric Grade 12.9 Nuts, Metric Grade 12.9 Screws, Metric Grade 12.9 Studs, and Metric Grade 12.9 Threaded Rods. All Metric Grade 12.9 fastener types are produced to ASTM with full EN 10204 MTC 3.1/3.2 documentation.
Metric Grade 12.9 Bolts
Metric Grade 12.9 Nuts
Metric Grade 12.9 Screws
Metric Grade 12.9 Studs
Metric Grade 12.9 Threaded Rods

Technical Data

Metric Grade 12.9 Washers Dimensions, Sizes & Thread Standards

Metric Grade 12.9 Washers are available in metric M6–M100 and inch ¼″–4″ as standard. Per DIN 125 (flat), DIN 127 (spring), and DIN 6916 (structural). Custom OD/ID and thickness available on request. Inch sizes per ASME B18.22.1. All Metric Grade 12.9 washers dimensions are verified against applicable DIN, ISO, and

Flat Washer Dimensions - Metric (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

StandardCovers
DIN 125Flat washers
DIN 127Spring lock washers
DIN 6916High-strength structural washers
ISO 7089Plain washers, normal series
ISO 7090Plain washers, chamfered
ASME B18.22.1Inch series flat washers
Material StandardRequirement
ISO 898-2Mechanical properties for washers
EN 14399-6Structural bolting assemblies
EN 10204 3.1Mill test certificate
EN 10204 3.2TPI-witnessed MTC

Material Chemistry

Metric Grade 12.9 Chemical Composition

Metric Grade 12.9 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)0.30-0.50
Manganese (Mn)0.50-1.30
Phosphorus (P)0.035 max
Sulfur (S)0.035 max
Silicon (Si)0.15-0.35
Chromium (Cr)0.30 max
Nickel (Ni)0.30 max
Molybdenum (Mo)0.20 max
Boron (B)0.003 max
? All heats spectro-tested and certified to ISO 898-1. Full chemical traceability provided.

Why Metric Grade 12.9 Alloy Composition Matters for Washers

High Carbon Content
The elevated carbon content (0.30–0.50%) is essential for achieving the high hardness and tensile strength required for Grade 12.9 washers, ensuring resistance to embedding and surface deformation under extreme loads.
Controlled Alloying
Manganese and silicon improve hardenability and toughness, while strict limits on phosphorus and sulfur prevent brittleness and ensure ductility, critical for dynamic and impact-loaded joints.
Low Alloy Additions
Trace additions of chromium, nickel, and molybdenum enhance corrosion resistance and tempering response, supporting the washer’s performance in aggressive environments and high-temperature service.

Fastener Performance

Metric Grade 12.9 Washers Mechanical Properties & Hardness Reference

The table below lists mechanical properties and hardness reference for Metric Grade 12.9 Washers per ASTM. Metric Grade 12.9 washers achieve 620 MPa tensile strength, with hardness, yield, and elongation values verified by NABL-accredited testing and reported in the EN 10204 MTC.

Washer SizeRecommended Bolt Torque (Nm)Max Load (kN)
M1211070
M16270140
M20530220
M24920320
M301800510
M363100740
M424700990
M4869001350
?? Washer selection: Always match washer hardness and size to bolt grade. Use flat washers under both bolt head and nut for optimal load distribution in Grade 12.9 assemblies.

Industry Applications

Metric Grade 12.9 Washers Applications — Industries & End Uses

Metric Grade 12.9 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 12.9 washers are used in bolted joints of construction equipment, mining machinery, and heavy presses where high preload and resistance to embedding are critical for safety and reliability.
Flat and spring washers for engine assemblies, suspension systems, and drivetrain connections in performance vehicles, trucks, and racing applications where Grade 12.9 bolts are specified for maximum clamping force.
Structural washers (DIN 6916) for high-strength friction grip (HSFG) bolted connections in steel bridges, towers, and building frameworks, ensuring even load transfer and preventing bolt relaxation under dynamic loads.
Washers for turbine tower flanges, nacelle assemblies, and foundation anchor bolts, providing secure, vibration-resistant joints in wind and solar installations exposed to cyclic loading and harsh environments.

Metric Grade 12.9 Washers Standards & International Certifications

Metric Grade 12.9 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 3.1 / 3.2PED 2014/68/EUCE Marking

Buy Metric Grade 12.9 Washers from India's Leading Manufacturer — Get a Competitive Quote Today

Partner with RealBolt — India’s leading manufacturer of certified Metric Grade 12.9 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 12.9 Washers — Frequently Asked Questions

Browse expert answers to common questions about Metric Grade 12.9 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 12.9 washers selection and pricing.
Metric Grade 12.9 washers are covered by ISO 898-2 for mechanical properties, DIN 125 for flat washers, DIN 127 for spring lock washers, and DIN 6916 for high-strength structural washers. For structural bolting assemblies, EN 14399-6 applies. All washers are supplied with EN 10204 3.1 or 3.2 certification.
It is not recommended to use Grade 12.9 alloy steel washers with stainless steel bolts due to the risk of galvanic corrosion and hardness mismatch. For stainless steel bolts, use washers of similar material and hardness to ensure joint integrity and corrosion resistance.
Metric Grade 12.9 washers are typically supplied with black oxide or zinc plating for corrosion protection. Other finishes such as hot-dip galvanizing or Geomet coating are available on request for enhanced corrosion resistance in aggressive environments.
Standard black oxide or zinc-plated Grade 12.9 washers are suitable for indoor and dry environments. For outdoor, marine, or corrosive applications, specify hot-dip galvanized or Geomet-coated washers, or consider stainless steel alternatives for maximum durability.

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