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SS 420 Studs Manufacturer & Exporter in India

Explore SS 420 Studs 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 Studs?

SS 420 studs are high-strength, martensitic stainless steel fasteners manufactured from ASTM A276/A479 Type 420 bar stock. These studs are known for their excellent hardness, moderate corrosion resistance, and superior wear resistance due to their high carbon and chromium content. SS 420 can be heat treated to achieve a wide range of mechanical properties, making these studs ideal for applications requiring both strength and moderate corrosion protection.

Commonly used in pump assemblies, valve bodies, and process equipment, SS 420 studs are specified where abrasion resistance and mechanical durability are critical, especially in mildly corrosive or wet environments. They are widely supplied for petrochemical, power generation, and general engineering applications.

Quick Specifications

MaterialStainless Steel 420
UNS NumberS42000
DIN Number1.4021
Material StandardASTM A276 / A479
Stud Standard (Metric)DIN 976 / DIN 975
Stud Standard (Inch)ASME B18.31.2
Thread FormISO Metric / UNC / UNF
Diameter RangeM6-M64 / ¼"-2½"
Tensile Strength700-950 MPa (annealed to hardened)
Yield Strength= 515 MPa (hardened)
HardnessUp to 50 HRC (hardened)
? All material certified by NABL-accredited laboratory. PMI and hardness survey available on request.

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 Washers, 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 Washers
SS 420 Threaded Rods

Technical Data

SS 420 Studs Dimensions, Sizes & Thread Standards

SS 420 Studs are available in metric M6–M100 and inch ¼″–4″ as standard. Per DIN 976 (fully threaded) / DIN 975 (threaded rod) / ASME B18.31.2. Custom cut lengths available in 5mm increments. Inch dimensions per ASME B18.31.2. All SS 420 studs dimensions conform to applicable DIN, ISO, and ASME B18 standards.

Stud Dimensions - Metric (DIN 976)

Size (M)Pitch (mm)Min L (mm)Max L (mm)
M61.0202000
M81.25202000
M101.5202000
M121.75252000
M162.0302000
M202.5402000
M243.0502000
M303.5602000
M364.0802000
M424.51002000
M485.01202000
M565.51402000
M646.01602000

Dimensional & Material Standards

StandardCoversThread
DIN 976Fully threaded studsMetric
DIN 975Threaded rodsMetric
ASME B18.31.2Continuous thread studsUNC/UNF
ISO 898-1Mechanical propertiesMetric
ASTM A193Stud bolts for pressure vesselsUNC
Material StandardRequirement
ASTM A276Bar/rod - SS 420
ASTM A479Pressure vessel quality
EN 10204 3.1Mill test certificate
EN 10204 3.2TPI-witnessed MTC

Material Chemistry

SS 420 Chemical Composition

SS 420 Studs 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/A479

ElementComposition (%)
Chromium (Cr)12.0-14.0%
Carbon (C)0.15% max
Manganese (Mn)1.00% max
Silicon (Si)1.00% max
Phosphorus (P)0.04% max
Sulfur (S)0.03% max
Nickel (Ni)0.75% max
Iron (Fe)Balance
? All heats verified by NABL-accredited spectrometry. PMI available on request.

Why SS 420 Alloy Composition Matters for Studs

High Carbon & Chromium — Wear & Hardness
The elevated carbon and chromium content in SS 420 enables high hardness after heat treatment, making these studs ideal for applications requiring abrasion resistance and mechanical durability.
Martensitic Structure — Strength & Toughness
SS 420 forms a martensitic microstructure when hardened, providing a balance of strength and moderate corrosion resistance, suitable for pump, valve, and process equipment fasteners.
Moderate Corrosion Resistance
While not as corrosion resistant as austenitic grades, SS 420 offers good resistance to atmospheric and mild chemical environments, especially when polished or passivated.

Fastener Performance

SS 420 Studs Mechanical Properties & Torque Reference

The table below lists mechanical properties and torque reference for SS 420 Studs per ASTM. SS 420 studs achieve 620 MPa tensile strength, with hardness, yield, and elongation values verified by NABL-accredited testing and reported in the EN 10204 MTC.

Stud SizeDry (Nm)Lubricated (Nm)Clamp Load (kN)
M12907235
M1622017680
M20440352130
M24760608190
M3015001200300
M3626002080430
M4242003360600
M4862004960800
?? Anti-galling: Use molybdenum-based or graphite anti-seize. Lubricated values assume K=0.16. Avoid over-tightening to prevent thread galling in stainless steels.

Industry Applications

SS 420 Studs Applications — Industries & End Uses

SS 420 Studs 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 studs are widely used for securing turbine casings, boiler flanges, and steam piping in power plants. Their high hardness and moderate corrosion resistance make them ideal for high-temperature and high-pressure environments where wear and mechanical strength are critical.
These studs are specified for pump shaft assemblies, valve body connections, and gland packing retainers, especially in water treatment, desalination, and chemical dosing systems where abrasion and moderate corrosion resistance are required.
SS 420 studs are used in heat exchanger channel covers, pressure vessel nozzles, and process piping flanges in refineries and chemical plants, providing reliable fastening in mildly corrosive and abrasive service conditions.
Used for fastening in heavy machinery, structural assemblies, and fabrication projects where high strength and wear resistance are needed, such as in mining, cement, and material handling equipment.

SS 420 Studs Standards & International Certifications

SS 420 Studs 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 938 DIN 939 DIN 976-1 ASME B18.31.2 IS 1364 IS 1367
Certifications
ISO 9001:2015PED 2014/68/EUNABL LabMTC 3.1 / 3.2

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

Partner with RealBolt — India’s leading manufacturer of certified SS 420 Studs — 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 Studs — Frequently Asked Questions

Browse expert answers to common questions about SS 420 Studs 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 studs selection and pricing.
SS 420 studs and threaded rods are available to DIN 976 (fully threaded studs), DIN 975 (threaded rods), and ASME B18.31.2 (inch series). For pressure vessel and flange applications, ASTM A193 can be specified. Custom thread forms (BSW, BSF, Whitworth) and cut-to-length options are available on request.
Use a molybdenum-based or graphite anti-seize compound (such as Molykote 1000 or Loctite LB 8008) on SS 420 studs to prevent galling and seizing during assembly. Avoid copper-based anti-seize in chloride environments. Lubricated torque values should be reduced by 20% compared to dry assembly.
Yes – SS 420 studs can be used up to 425°C in the hardened and tempered condition. They retain high strength and hardness at elevated temperatures, making them suitable for turbine, boiler, and steam service. For continuous exposure above 425°C, consider alternative grades with higher scaling resistance.
Standard sizes (M10-M36) are available ex-stock with no formal MOQ – single pieces can be supplied for urgent maintenance. Custom diameters or cut-to-length studs may require a 10 kg minimum. Price breaks are available at 50, 200, and 500 pieces.

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