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SS 420 Nuts Manufacturer & Exporter in India

Explore SS 420 Nuts 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 Nuts?

SS 420 nuts are high-strength, martensitic stainless steel fasteners manufactured from AISI 420 bar stock, conforming to ASTM A276 and ASTM A194 standards. With a minimum chromium content of 12%, SS 420 nuts offer a unique combination of moderate corrosion resistance and excellent mechanical strength, especially after heat treatment and hardening.

These nuts are magnetic, can be hardened up to 50 HRC, and are widely specified for applications requiring superior wear resistance, such as pump assemblies, valve bodies, and high-pressure flange connections. SS 420 nuts are commonly used in the petrochemical, power generation, and engineering sectors where both strength and moderate corrosion resistance are required.

Quick Specifications

MaterialStainless Steel 420
UNS NumberS42000
DIN Number1.4021
Material StandardASTM A276 / ASTM A194
Nut Standard (Metric)DIN 934 / ISO 4032
Nut Standard (Inch)ASME B18.2.2
Thread FormISO Metric / UNC / UNF
Diameter RangeM6-M64 / ¼"-2½"
Tensile Strength700-950 MPa (min)
Yield Strength= 500 MPa
HardnessUp to 50 HRC
? All material certified by NABL-accredited laboratory. Hardness and PMI reports 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 Screws, SS 420 Washers, 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 Screws
SS 420 Washers
SS 420 Studs
SS 420 Threaded Rods

Technical Data

SS 420 Nuts Dimensions, Sizes & Thread Standards

SS 420 Nuts are available in metric M6–M100 and inch ¼″–4″ as standard. Per DIN 934 (hex nut) / ISO 4032. Custom thread pitches and special geometries available. Inch dimensions per ASME B18.2.2. All SS 420 nuts dimensions are verified against applicable DIN, ISO, and ASME B18 standards before dispatch

Hex Nut Dimensions - Metric (DIN 934 / ISO 4032)

Size (M)Pitch (mm)A/F (mm)Height (mm)
M61.0105
M81.25136.5
M101.5178
M121.751910
M162.02413
M202.53016
M243.03619
M303.54624
M364.05529
M424.56534
M485.07538
M565.58545
M646.09551

Dimensional & Material Standards

StandardCoversThread
DIN 934Hex nutsMetric
ISO 4032Hex nutsMetric
ASME B18.2.2Hex & heavy hex nutsUNC/UNF
DIN 439Thin nutsMetric
ISO 4035Thin hex nutsMetric
Material StandardRequirement
ASTM A276Bar/rod - SS 420
ASTM A194Nut mechanical
EN 10204 3.1Mill test certificate
EN 10204 3.2TPI-witnessed MTC

Material Chemistry

SS 420 Chemical Composition

SS 420 Nuts 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

ElementComposition (%)
Carbon (C)0.15% max
Chromium (Cr)12.0-14.0%
Manganese (Mn)1.00% max
Silicon (Si)1.00% max
Phosphorus (P)0.040% max
Sulfur (S)0.030% max
Nickel (Ni)0.60% max
Molybdenum (Mo)0.60% max
Iron (Fe)Balance
? All heats verified by NABL-accredited spectrometry. PMI available on request.

Why SS 420 Alloy Composition Matters for Nuts

High Carbon Content — Hardening Capability
The elevated carbon content in SS 420 enables the nuts to be heat treated and hardened up to 50 HRC, providing superior wear resistance and strength for high-load applications.
Chromium (12–14%) — Corrosion Resistance
Chromium forms a passive oxide layer, giving SS 420 nuts moderate resistance to atmospheric and mild chemical corrosion, suitable for pump, valve, and process equipment.
Machinability & Magnetic Properties
SS 420 is magnetic and can be machined to tight tolerances, making it ideal for precision nut manufacturing and applications requiring magnetic response.

Fastener Performance

SS 420 Nuts Mechanical Properties & Torque Reference

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

Nut SizeRecommended Torque (Nm)Clamp Load (kN)
M127035
M1617070
M20340110
M24590160
M301200260
M362100380
M423200540
M484700750
?? Anti-galling: Use molybdenum-based anti-seize for SS 420 nuts. Lubricated values assume K=0.16. Avoid over-torquing to prevent thread galling.

Industry Applications

SS 420 Nuts Applications — Industries & End Uses

SS 420 Nuts 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 nuts are widely used in pump casings, valve bodies, and high-pressure sealing assemblies where high hardness and moderate corrosion resistance are required. Their wear resistance makes them ideal for gland packing and stuffing box applications.
Used in turbine casings, boiler flange connections, and steam line supports, SS 420 nuts withstand high mechanical loads and thermal cycling in power plants, especially where carbon steel nuts would corrode or soften.
SS 420 nuts are specified for process vessel closures, heat exchanger channel covers, and reactor manways in refineries and chemical plants, providing strength and moderate corrosion resistance in hydrocarbon and mild acid environments.
SS 420 nuts are used in jigs, fixtures, and machine tool assemblies where repeated tightening and loosening demand high wear resistance and dimensional stability.

SS 420 Nuts Standards & International Certifications

SS 420 Nuts 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 934 ISO 4032 ASME B18.2.2 EN ISO 4032 IS 1364 IS 1367
Certifications
ISO 9001:2015PED 2014/68/EUNABL LabMTC 3.1 / 3.2

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

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

Browse expert answers to common questions about SS 420 Nuts 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 nuts selection and pricing.
SS 420 hex nuts are available to DIN 934 (metric), ISO 4032, and ASME B18.2.2 (inch hex and heavy hex). Thin nuts per DIN 439 and ISO 4035 are also available. Custom thread forms (BSW, BSF, Whitworth) can be supplied on request with a typical lead time of 10-15 working days.
Molybdenum-based anti-seize compound (such as Molykote 1000 or Loctite LB 8012) is recommended for SS 420 nuts to prevent galling and seizing. Apply to both threads and nut faces. Avoid copper-based anti-seize, as it may cause galvanic corrosion in some environments.
SS 420 nuts can be used up to 450°C in dry air, but prolonged exposure above 400°C may reduce mechanical properties due to tempering effects. For continuous high-temperature service, consider austenitic stainless grades. Consult our engineering team for application-specific advice.
No MOQ for standard sizes (M8-M36) available ex-stock. Custom sizes or non-standard threads may require a minimum order of 10 kg or 100 pieces. Bulk price breaks are available at 100, 500, and 1000 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