420 Stainless Steel - Martensitic High-Hardness Alloy
420 Stainless Steel stands out for its strength and hardness, plus it holds up well against wear. Fighter Jet Metals offers it as bars, plates, and sheets—mostly for industries like aerospace, defense, surgical tools, and precision engineering, where reliable performance really matters.
It resists rust about as well as 410 Stainless, but it’s tougher because it has more carbon. This alloy is magnetic, whether it’s been softened up (annealed) or hardened. If you want the best corrosion resistance and mechanical strength, you need to harden and temper it all the way.
Applications of 420 Stainless Steel
- Surgical Instruments and Medical Devices
- Aerospace Fasteners and Structural Hardware
- Firearms and Defense Components
- Pump Shafts and Valve Parts
- Cutlery and Industrial Blades
Overview
420 Stainless is often selected for parts exposed to mild corrosive environments where wear resistance and edge retention are critical. It can be heat-treated to achieve Rockwell hardness levels above 50 HRC, making it ideal for cutting tools, bearing surfaces, and precision mechanical parts.
420 STAINLESS STEEL SPECIFICATIONS
Bars & Forgins
High-quality bars and forgings suitable for structural, machined, and high-stress components.
Sheets & Plates
sheets offering excellent corrosion resistance and formability for demanding applications.
FEDERAL / MILITARY SPECIFICATIONS
Government-certified sheets ensuring performance and durability under critical service conditions.
Certified Material for Critical Service
All 420 Stainless Steel supplied by Fighter Jet Metals includes full mill test reports, heat numbers, and traceability documentation. Dual certifications and compliance with specific aerospace or military standards can be arranged upon request.