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SS 420 Washers Manufacturer & Exporter in India

Explore SS 420 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 SS 420 Washers?

SS 420 washers are flat or shaped fastener components manufactured from martensitic stainless steel grade 420, conforming to ASTM A276/A240 standards. Known for their high hardness and moderate corrosion resistance, SS 420 washers are typically used in bolted assemblies where wear resistance and strength are critical. The alloy’s ability to be hardened by heat treatment makes it ideal for applications requiring a durable, load-distributing washer in aggressive environments.

With a minimum hardness of 48 HRC after heat treatment, SS 420 washers are widely specified in pump assemblies, valve covers, and high-pressure flange joints, especially where galling and deformation under load must be minimized. They are suitable for both metric and inch hardware, and are available in a variety of forms including flat, spring, and lock washers.

Quick Specifications

MaterialStainless Steel 420
UNS NumberS42000
DIN Number1.4021
Material StandardASTM A276 / ASTM A240
Washer Standard (Metric)DIN 125 / DIN 127 / DIN 9021
Washer Standard (Inch)ASME B18.22.1
FormFlat / Spring / Lock / Tab
Diameter RangeM3-M64 / 1/8"-2.5"
Hardness48-52 HRC (quenched & tempered)
Tensile Strength=700 MPa
Yield Strength=500 MPa
? All washers supplied with full traceability and hardness certification. PMI and third-party inspection available.

Complete the Fastener Set

Other SS 420 Fastener Products Available from RealBolt

RealBolt also manufactures the complete SS 420 fastener range from certified stainless steel bar stock, including SS 420 Bolts, SS 420 Nuts, SS 420 Screws, SS 420 Studs, and SS 420 Threaded Rods. All SS 420 fastener types are produced to ASTM with full EN 10204 MTC 3.1/3.2 documentation.
SS 420 Bolts
SS 420 Nuts
SS 420 Screws
SS 420 Studs
SS 420 Threaded Rods

Technical Data

SS 420 Washers Dimensions, Sizes & Thread Standards

SS 420 Washers are available in metric M6–M100 and inch ¼″–4″ as standard. Per DIN 125 (flat), DIN 127 (spring), DIN 9021 (large OD), and ASME B18.22.1. Custom OD/ID and thickness available on request. All SS 420 washers dimensions are verified against applicable DIN, ISO, and ASME B18 standards before

Flat Washer Dimensions - Metric (DIN 125)

Size (M)Inner Ø (mm)Outer Ø (mm)Thickness (mm)
M33.270.5
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 9021Large OD washersMetric
ASME B18.22.1Plain & lock washersInch
ISO 7089Flat washersMetric
ISO 7090Chamfered washersMetric
Material StandardRequirement
ASTM A276SS 420 bar/rod
ASTM A240SS 420 plate/sheet
EN 10088-1General requirements
EN 10204 3.1Mill test certificate
EN 10204 3.2TPI-witnessed MTC

Material Chemistry

SS 420 Chemical Composition

SS 420 Washers are manufactured from an iron-chromium-nickel alloy with chromium (16–26%), nickel (8–28%), and grade-specific molybdenum additions per ASTM and ASTM A193/A194. Chromium content governs the self-healing passive oxide film; molybdenum (2–6%) enhances chloride pitting resistance; and carbon content determines sensitization risk in welded assemblies.

Chemical Composition per ASTM A276/A240

ElementComposition (%)
Carbon (C)0.15% max
Chromium (Cr)12.0-14.0%
Nickel (Ni)0.75% max
Manganese (Mn)1.0% max
Silicon (Si)1.0% max
Phosphorus (P)0.04% max
Sulfur (S)0.03% max
Iron (Fe)Balance
? All heats verified by spectrometry. Full chemical test reports supplied with every batch.

Why SS 420 Alloy Composition Matters for Washers

High Carbon Content — Hardness & Wear Resistance
The elevated carbon content in SS 420 enables the washers to be heat treated to high hardness (up to 52 HRC), making them ideal for resisting deformation and wear under high clamping loads.
Chromium (12–14%) — Corrosion Resistance
Chromium provides a passive oxide layer, giving SS 420 washers moderate corrosion resistance in water, mild acids, and atmospheric conditions, suitable for many industrial and mechanical applications.
Low Nickel — Cost Efficiency
With low nickel content, SS 420 washers offer a cost-effective solution for applications where high hardness is more critical than maximum corrosion resistance.

Fastener Performance

SS 420 Washers Mechanical Properties & Hardness Reference

The table below lists mechanical properties and hardness reference for SS 420 Washers per ASTM. SS 420 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 Hardness (HRC)Max Load (kN)
M648-528
M1048-5218
M1648-5238
M2048-5260
M2448-5290
M3048-52140
M3648-52200
?? Note: SS 420 washers must be properly heat treated and tempered to achieve specified hardness and avoid brittleness. Not recommended for use above 425°C.

Industry Applications

SS 420 Washers Applications — Industries & End Uses

SS 420 Washers from RealBolt are specified across food and dairy, pharmaceutical, marine, chemical processing, and oil and gas where very good corrosion resistance and 620 MPa tensile strength are required for reliable fastener performance. Click each industry below for detailed application examples.
SS 420 washers are widely used in pump casings, valve covers, and gland assemblies where high hardness is required to prevent embedding and maintain gasket compression under cyclic loading. Their wear resistance makes them ideal for dynamic sealing applications.
Used as backing washers and spring washers in chemical process equipment, SS 420 provides moderate corrosion resistance and high strength for bolted joints exposed to mild acids, solvents, and process water.
Flat and lock washers in turbine casings, generator covers, and high-pressure steam lines where hardness and dimensional stability are critical for maintaining bolt preload and preventing joint loosening.
SS 420 washers are specified in brake assemblies, suspension joints, and engine mounts for their ability to resist galling and deformation under high clamping forces and vibration.

SS 420 Washers Standards & International Certifications

SS 420 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, ISO 3506 material certification, and NABL-accredited lab reports — available on request for all orders.
Standards
DIN 125A DIN 126 DIN 127 DIN 128 ISO 7089 ISO 7090 ASME B18.21.1 EN ISO 7089 IS 5372 IS 1367
Certifications
ISO 9001:2015PED 2014/68/EUNABL LabMTC 3.1 / 3.2

Buy SS 420 Washers from India's Leading Manufacturer — Get a Competitive Quote Today

Partner with RealBolt — India’s leading manufacturer of certified SS 420 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
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Answers for Buyers

SS 420 Washers — Frequently Asked Questions

Browse expert answers to common questions about SS 420 Washers from RealBolt — covering ASTM A193/A194 grades, chloride resistance, temperature limits, sensitization, sizes, and MTC documentation. Contact our technical team directly for project-specific guidance on SS 420 washers selection and pricing.
SS 420 washers are available to DIN 125 (flat), DIN 127 (spring), DIN 9021 (large OD), ISO 7089/7090, and ASME B18.22.1 (inch). Custom forms such as tab, cup, and conical washers can be produced to drawing or ISO/EN standards. All washers are supplied with full material and hardness certification.
SS 420 washers offer moderate corrosion resistance in water, mild acids, and atmospheric conditions. They are suitable for many industrial and mechanical applications but are not recommended for highly aggressive or chloride-rich environments. For severe corrosion, consider SS 316 or duplex grades.
After proper heat treatment and tempering, SS 420 washers achieve a hardness of 48-52 HRC, making them ideal for high-load and wear-prone applications. Hardness is verified for every batch and certified on the MTC.
Yes, SS 420 is a martensitic stainless steel and is magnetic in all conditions, including after heat treatment. This property is useful for applications where magnetic response is required for assembly or detection.

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