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SS 420 Screws Manufacturer & Exporter in India

Explore SS 420 Screws 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 Screws?

SS 420 screws are high-strength, martensitic stainless steel fasteners manufactured from AISI 420 (UNS S42000) bar stock, conforming to ASTM A276 and ASTM F899. This grade is known for its excellent hardness and moderate corrosion resistance, achieved through heat treatment. SS 420 screws are magnetic and can be hardened up to 50 HRC, making them ideal for applications requiring wear resistance and mechanical strength.

These screws are widely used in pump assemblies, valve components, and food processing equipment where both strength and hygiene are critical. SS 420 screws are also specified for applications where mild corrosive environments are present, and higher hardness is required compared to austenitic stainless steels.

Quick Specifications

MaterialStainless Steel 420
UNS NumberS42000
DIN Number1.4021
Material StandardASTM A276 / ASTM F899
Screw Standard (Metric)DIN 963 / DIN 965 / ISO 7046
Screw Standard (Inch)ASME B18.6.3
Thread FormISO Metric / UNC / UNF
Diameter RangeM3-M36 / #4-1½"
Tensile Strength700-950 MPa (min, heat treated)
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 Nuts, 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 Nuts
SS 420 Washers
SS 420 Studs
SS 420 Threaded Rods

Technical Data

SS 420 Screws Dimensions, Sizes & Thread Standards

SS 420 Screws are available in metric M6–M100 and inch ¼″–4″ as standard. Per DIN 963 (slotted countersunk), DIN 965 (cross recessed), ISO 7046, and ASME B18.6.3. Custom lengths and thread forms available on request. All SS 420 screws dimensions are verified against applicable DIN, ISO, and ASME B18 standards

Countersunk & Pan Head Screw Dimensions - Metric (DIN 963 / DIN 965)

Size (M)Pitch (mm)Head Dia (mm)Head Ht (mm)Min L (mm)Max L (mm)
M30.56.01.65640
M40.78.02.2860
M50.810.02.51080
M61.012.03.012100
M81.2516.04.016120
M101.520.05.020150
M121.7524.06.024180
M162.032.08.032200
M202.540.010.040250
M243.048.012.048300
M303.560.015.060350
M364.072.018.072400

Dimensional & Material Standards

StandardCoversThread
DIN 963Slotted countersunk screwsMetric
DIN 965Cross recessed countersunk screwsMetric
ISO 7046Countersunk head screwsMetric
ASME B18.6.3Machine screwsUNC/UNF
ISO 14581Hexalobular socket screwsMetric
Material StandardRequirement
ASTM A276Bar/rod - SS 420
ASTM F899Fastener mechanical
EN 10088-3Stainless steel grades
EN 10204 3.1Mill test certificate
EN 10204 3.2TPI-witnessed MTC

Material Chemistry

SS 420 Chemical Composition

SS 420 Screws 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%
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 NABL-accredited spectrometry. PMI and hardness reports available on request.

Why SS 420 Alloy Composition Matters for Screws

High Carbon Content — Hardening Capability
The elevated carbon content in SS 420 enables the screws to be heat treated to high hardness (up to 50 HRC), providing excellent wear resistance for moving assemblies and high-load joints.
Chromium (12–14%) — Corrosion Resistance
Chromium forms a passive oxide layer, giving SS 420 screws moderate resistance to atmospheric and mild chemical corrosion, suitable for food processing and pump applications.
Magnetic & Machinable
SS 420 is a martensitic stainless steel, making screws magnetic and easily machinable in the annealed state, then hardened after forming for optimal performance.

Fastener Performance

SS 420 Screws Mechanical Properties & Torque Reference

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

Screw SizeDry (Nm)Lubricated (Nm)Clamp Load (kN)
M42.82.24.0
M69.87.88.5
M8241915.0
M10483824.0
M12846735.0
M1621016860.0
M2042033695.0
?? Anti-galling: Use molybdenum-based anti-seize for SS 420 screws. Lubricated values assume K=0.15. Avoid over-tightening to prevent thread galling.

Industry Applications

SS 420 Screws Applications — Industries & End Uses

SS 420 Screws 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 screws are widely used in food processing machinery, packaging lines, and conveyor systems where moderate corrosion resistance and high hardness are required for hygiene and wear resistance.
Used in pump housings, valve bodies, and impeller assemblies, SS 420 screws provide the necessary strength and wear resistance for moving parts and sealing applications in water and mild chemical environments.
SS 420 screws are specified for engine covers, transmission housings, and brake assemblies where high mechanical strength and resistance to abrasion are critical.
Due to their ability to be polished to a mirror finish and sterilized, SS 420 screws are used in surgical tools, dental instruments, and orthopedic devices per ASTM F899.

SS 420 Screws Standards & International Certifications

SS 420 Screws 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 912 DIN 913 DIN 914 DIN 915 DIN 916 ISO 4762 ISO 10642 ASME B18.3 EN ISO 4762 IS 1367
Certifications
ISO 9001:2015PED 2014/68/EUNABL LabMTC 3.1 / 3.2

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

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

Browse expert answers to common questions about SS 420 Screws 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 screws selection and pricing.
SS 420 screws are available to DIN 963 (slotted countersunk), DIN 965 (cross recessed), ISO 7046, and ASME B18.6.3 (inch machine screws). Custom thread forms such as UNC, UNF, and Whitworth can be supplied on request with a typical lead time of 10-15 working days.
For SS 420 screws, use a molybdenum-based or nickel-based anti-seize compound (such as Molykote P-37 or Loctite LB 8012) on threads and under the head. This prevents galling and eases disassembly. Avoid copper-based anti-seize to prevent galvanic corrosion.
Yes – SS 420 screws are approved for food contact equipment and are widely used in medical and surgical instruments. They can be polished to a hygienic finish and sterilized. Always request ASTM F899 compliance for medical applications.
No MOQ for standard sizes (M4-M16) held in stock – single-piece orders are accepted for urgent needs. Custom sizes or head types may require a 10 kg minimum. 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