400 Stainless Steel Fasteners are high-strength, wear-resistant fastening components manufactured from the 400 series family of stainless steels, which includes ferritic and martensitic grades. These fasteners are designed for applications where mechanical strength, hardness, and cost efficiency are more important than extreme corrosion resistance.

Widely used in automotive, machinery, construction, and industrial engineering, 400 series fasteners offer reliable performance in moderately corrosive and high-wear environments.

At The Industrial Mandate, we supply a full range of 400 stainless steel fasteners including bolts, nuts, socket screws, washers, and custom engineered fastening solutions.

What are 400 Stainless Steel Fasteners?

400 stainless steel fasteners are made from a family of stainless steels containing approximately 11–27% chromium and higher carbon content compared to 300 series grades. This composition gives them high hardness and strength, with magnetic properties and heat-treatable capability.

Unlike 304 or 316 stainless steels, 400 series grades are typically martensitic or ferritic, meaning they can be hardened through heat treatment to achieve superior mechanical strength and wear resistance.

These fasteners are commonly used where:

• High strength and hardness are required
• Wear resistance is critical
• Moderate corrosion conditions exist
• Cost-effective stainless performance is needed

Key Characteristics of 400 Stainless Steel Fasteners

High Strength and Hardness

400 series stainless steels can be heat treated to achieve very high hardness and tensile strength, making them suitable for demanding mechanical applications such as fasteners, shafts, and tooling components.

Wear Resistance

Due to their higher carbon content and martensitic structure, these fasteners perform well in abrasive and high-friction environments.

Magnetic Properties

Unlike 300 series stainless steels, 400 series fasteners are magnetic, which is useful in applications requiring magnetic detection or separation systems.

Moderate Corrosion Resistance

400 series fasteners offer corrosion resistance in mild atmospheric conditions but are less resistant than 304 or 316 grades in marine or chemical environments.

Heat Treatable

A major advantage is the ability to strengthen these fasteners through heat treatment processes, allowing performance customization based on application requirements.

Types of 400 Stainless Steel Fasteners

We supply a wide range of 400 series fasteners including:

• 400 Stainless Steel Bolts
• 400 Stainless Steel Nuts
• 400 Stainless Steel Socket Screws
• 400 Stainless Steel Washers
• 400 Stainless Steel Stud Bolts
• 400 Stainless Steel Machine Screws
• Custom Machined 400 Stainless Steel Components

These fasteners are available in multiple sizes and thread configurations for industrial and engineering applications.

Common Grades in 400 Series Fasteners

410 Stainless Steel Fasteners

A general-purpose martensitic grade known for strength, hardness, and wear resistance. Commonly used in fasteners and industrial hardware.

420 Stainless Steel Fasteners

Higher carbon content than 410, offering increased hardness and better wear resistance for precision components.

430 Stainless Steel Fasteners

A ferritic grade offering better corrosion resistance than martensitic types but lower strength, often used in non-critical fastening applications.

Applications of 400 Stainless Steel Fasteners

400 stainless steel fasteners are widely used in industries where strength and durability are more important than extreme corrosion resistance:

• Automotive components and exhaust systems
• Machinery and industrial equipment
• Pumps and valves
• Construction and structural applications
• Engineering and tooling systems
• General manufacturing industries
• Household appliances and hardware

Their balance of strength, machinability, and cost efficiency makes them a practical choice for many engineering applications.

Why Choose The Industrial Mandate for 400 Stainless Steel Fasteners?

• Wide range of 400 series grades and fastener types
• Precision engineered for industrial performance
• Cost-effective stainless steel solutions
• Available in metric and imperial sizes
• Suitable for high-strength mechanical applications
• Reliable global supply capability

At The Industrial Mandate, our 400 stainless steel fasteners are engineered to deliver strength, durability, and dependable performance in demanding industrial environments where wear resistance and mechanical integrity are essential.