SS 420 Round Bars & Rods

Mechanical Strength • Accuracy & Straightness • Quality & Finish

Get a Quote

Stainless Steel 420 Explained

Stainless Steel 420 is a high-carbon martensitic stainless steel. To begin with, it is renowned for its exceptional hardness and excellent wear resistance. Furthermore, it achieves a superior polished finish after heat treatment — making it ideal for applications requiring a mirror-like surface.

What makes SS 420 the preferred choice for demanding applications? First and foremost, it offers outstanding cutting-edge retention for precision tools and blades. In addition, it provides moderate corrosion resistance along with high strength and excellent toughness. Moreover, its ability to take a high-quality polish makes it highly sought after in medical and consumer products.

Consequently, Stainless Steel 420 is widely used in surgical instruments, cutlery, and blades. Furthermore, it is also trusted in molds, dies, and precision tools. Equally important, its combination of hardness, wear resistance, and mirror-finish capability makes it the preferred choice for medical, industrial, and consumer cutting applications.

Need high-quality SS 420 round bars for your precision application? Contact our technical team today — we’ll help you select the right size, finish, and heat treatment condition for your specific requirements, and provide a competitive quote tailored to your needs.

Other Types of Stainless Steel 420 Bars

SS 420 Stainless Steel Square Bar
View SS 420 Square Bar
SS 420 Square Bar
  • Stainless Steel 420 square bars for tooling and precision parts
  • UNS S42000 hardened martensitic stainless steel
  • Manufactured in compliance with ASTM A276 / ASME SA276
  • DIN 1.4021 material grade specification
SS 420 Stainless Steel Hex Bar
View SS 420 Hex Bar
SS 420 Hex Bar
  • ASME SA276 SS 420 hexagonal bar supply
  • ASTM A276 certified hex rods
  • DIN 1.4021 / UNS S42000 material conformity
  • Available in polished and bright drawn profiles
SS 420 Stainless Steel Rectangular Bar
View SS 420 Rectangular Bar
SS 420 Rectangular Bar
  • ASTM A276 stainless steel 420 rectangular bars
  • UNS S42000 / DIN 1.4021 grade classification
  • Produced for machining and structural use
  • Supplied in precision polished finishes
SS 420 Stainless Steel Flat Bar
View SS 420 Flat Bar
SS 420 Flat Bar
  • DIN 1.4021 stainless flat bar sections
  • UNS S42000 grade for wear-resistant components
  • Produced under ASTM A276 / ASME SA276 norms
  • Supplied in hot rolled and polished surface options
SS 420 Stainless Steel Bright Bar
View SS 420 Bright Bar
SS 420 Bright Bar
  • ASTM A276 SS 420 bright finish bars
  • UNS S42000 martensitic stainless steel grade
  • Cold drawn and centerless ground surface
  • Tight dimensional tolerance and smooth finish
SS 420 Stainless Steel Forged Bar
View SS 420 Forged Bar
SS 420 Forged Bar
  • UNS S42000 stainless steel forged bar products
  • ASTM A276 compliant SS 420 forged rods
  • Heat treated forgings for high hardness applications
  • Ideal for tooling and heavy mechanical service

420 STAINLESS STEEL ROUND BAR EQUIVALENT GRADES

STANDARD UNS WNR. JIS
SS 420 S42000 1.4021 SUS 420

SPECIFICATION OF STAINLESS STEEL 420 ROUND BAR

Standard ASTM A276 / A479, ASME SA276 / SA479
Dimension Standard EN, DIN, JIS, ASTM, BS, ASME, AISI
Size 14 mm – 300 mm
Length 1 to 6 Meters, Custom Cut Length
Form Round, Square, Hex (A/F), Rectangle, Billet, Ingot, Forging etc.

CHEMICAL COMPOSITION OF STAINLESS STEEL 420 ROUND BAR

Grade C % Mn % Si % P % S % Cr % Ni %
420 0.15 max 1.00 max 1.00 max 0.04 max 0.03 max 12.0 – 14.0 0.50 max

MECHANICAL PROPERTIES OF STAINLESS STEEL 420 ROUND BAR

Condition Tensile Strength (MPa) Yield Strength 0.2% (MPa) Elongation (%) Hardness (Brinell HB)
Annealed 655 345 25 241 max
Tempered at 399°F (204°C) 1600 1360 12 444
Tempered at 600°F (316°C) 1580 1365 14 444
Tempered at 800°F (427°C) 1620 1420 10 461
Tempered at 1000°F (538°C) 1305 1095 15 375
Tempered at 1099°F (593°C) 1035 810 18 302
Tempered at 1202°F (650°C) 895 680 20 262

* Annealed tensile properties are typical for Condition A of ASTM A276; annealed hardness is the specified maximum.

💡 Practical Difference in Use

Use Stainless Steel 420 Round Bars when: very high hardness, excellent wear resistance, good surface finish, and moderate corrosion resistance are required. SS 420 contains higher carbon than SS 410, allowing it to achieve superior strength and edge retention after heat treatment. It is ideal for precision components where durability and polish quality are important. → Example: surgical instruments, cutting tools, blades, valve components, bearings, shafts, mould parts, and machine components.


Heat Treated Stainless Steel 420 Round Bars when: maximum hardness, superior abrasion resistance, and long service life under continuous mechanical stress are required. Proper hardening and tempering significantly improve load capacity and surface durability. → Example: knives, industrial cutters, dies, punches, turbine components, automotive transmission parts, mining tools, and heavy-duty fasteners.

Applications of Stainless Steel 420 Round Bars

Stainless Steel 420 round bars are widely used in tooling, medical, mechanical, and industrial applications where high hardness, wear resistance, polishability, and dependable performance are essential.

  • Tooling & Cutting Equipment: Blades, knives, punches, dies, shear parts, and industrial cutters.
  • Medical & Surgical: Surgical instruments, dental tools, clamps, and precision devices.
  • Mechanical & Manufacturing: Shafts, bearings, valve parts, moulds, and machine assemblies.

When to Choose Stainless Steel 420 Round Bars?

The selection mainly depends on hardness requirement, wear resistance, surface finish quality, heat treatment capability, and operating environment.

Choose SS 420 Round Bars when:

  • Very high hardness and edge retention are required
  • Parts are exposed to continuous friction and abrasion
  • Excellent surface polish and dimensional accuracy are important
  • Used in blades, tools, bearings, valve parts, and mould components
  • Moderate corrosion resistance is acceptable
  • Long wear life is more important than ductility

SS 420 Heat Treated Round Bars are preferred when:

  • Maximum achievable hardness is required
  • High resistance to abrasion and surface fatigue is needed
  • Components operate under heavy mechanical loads
  • Used in tooling, mining, automotive, and industrial machinery
  • Stable performance after repeated stress cycles
  • Extended service life in demanding environments

Industries That Use Stainless Steel 420 Round Bars

SS 420 is preferred in industries where hardness, wear resistance, surface finish quality, precision machining, and heat treatability are critical.

Tooling & Die Industry

Used in high-wear cutting and forming tools.

Uses

Knives, punches, dies, shear blades.

Why SS 420?

Exceptional hardness and wear resistance.

Medical & Surgical Industry

Used in precision medical instruments.

Uses

Surgical tools, clamps, dental instruments.

Why SS 420?

Excellent polishability and corrosion resistance.

Automotive & Engineering

Used in high-stress mechanical components.

Uses

Transmission parts, bearings, shafts, fasteners.

Why SS 420?

High strength with long wear life.

Valve & Pump Manufacturing

Used in wear-prone flow control components.

Uses

Valve trims, pump shafts, sleeves.

Why SS 420?

Resists abrasion and maintains dimensional stability.

Mining & Heavy Machinery

Used in impact and abrasion-intensive equipment.

Uses

Crusher tools, wear parts, heavy-duty fasteners.

Why SS 420?

Superior toughness after hardening.

Plastic & Rubber Moulding

Used in mould tooling and cavities.

Uses

Mould cores, inserts, precision components.

Why SS 420?

High polish finish and dimensional stability.

Request a Quote

Looking for high-quality Stainless Steel 420 Round Bars & Rods? Fully compliant with ASTM A276, A479 and ASME SA276, SA479. Get in touch with us today.

Contact Us