SUS420 Angular Contact Ball Bearings Manufacturers

Product Range and Positioning

SUS420 is a martensitic stainless steel that offers a balance of corrosion resistance, high hardness after heat treatment, and good wear resistance. We manufacture angular contact ball bearings in this material for applications that require both load capacity and protection against moisture, mild chemicals, or washdown environments.

Our SUS420 angular contact bearings are available in:

• Single-row and double-row configurations
• Contact angles of 15°, 25°, and 40° (or custom angles)
• Metric and inch bore sizes, from miniature to medium diameters
• Open, shielded (ZZ), or sealed (2RS) variants
• Steel, brass, or polymer cages depending on speed and load requirements

We position this product family as a corrosion-resistant alternative to standard bearing steel angular contact bearings, without sacrificing precision or running accuracy. For projects that need higher hardness or extreme corrosion resistance, we also offer SUS440 and SUS316 variants within the same angular contact bearing line.

Application Fit

SUS420 angular contact ball bearings are used in equipment where the bearing is exposed to humidity, steam, or occasional splashing, and where axial stiffness is required. Typical applications include:

• Food processing and packaging machinery
• Pharmaceutical and medical devices
• Marine and offshore equipment
• Textile and printing machinery
• Pumps, compressors, and gearboxes
• Robotics and automation spindles

Because SUS420 can be hardened to about HRC 50–55, it provides better load capacity than austenitic grades like SUS304 or SUS316. We help customers match the bearing material, heat treatment, and sealing to the actual operating environment.

Material and Design Considerations

We select SUS420 for its combination of corrosion resistance and mechanical strength. The bearing rings and balls are made from SUS420 stainless steel, and we apply a controlled heat treatment to achieve the required hardness and dimensional stability. For high-speed or low-noise applications, we can fit ceramic balls (hybrid) or use a specialized cage material.

Our engineering team evaluates the following before recommending a configuration:

• Operating temperature range and thermal expansion
• Lubrication type (grease, oil, or dry film)
• Required preload and axial clearance
• Speed factor (DN value) and cage strength
• Sealing effectiveness against contaminants

Critical Specifications and Performance

We manufacture SUS420 angular contact bearings to ISO and DIN tolerance classes, typically P0, P6, and P5. Our in-house testing verifies radial runout, axial runout, contact angle, and noise level. The bearings are designed for low vibration and consistent friction torque, which is essential for precision spindles and servo motors.

Key performance parameters we control:

Configuration and Customization

We understand that standard catalogs do not always cover the exact requirement. Our engineering team works from your drawing, sample, or performance specification to develop a bearing that fits your assembly. We can modify:

• Bore and outside diameter dimensions
• Raceway curvature and contact angle
• Cage material and pocket design
• Seal or shield type and material
• Preload and internal clearance (C2, CN, C3, C4)
• Lubrication fill and type

We also support hybrid versions with silicon nitride or zirconia balls for electrical insulation or higher speed capability. For high-volume production, we use automated lines to ensure consistency; for prototypes, we provide quick turnaround.

Quality Assurance and Testing

Our factory operates under IATF 16949, RoHS, CE, and SGS certifications. We implement a closed-loop quality system from incoming raw material to final packaging. Each batch of SUS420 angular contact bearings is inspected for dimensional accuracy, hardness, surface finish, and running noise.

We use high-precision measuring instruments including roundness testers, surface roughness testers, and vibration analyzers. We also perform life tests on sample bearings to validate load capacity and durability under simulated operating conditions.

Information We Use to Configure Your Solution

To prepare a precise quotation and design, we need the following from you:

• Bearing dimensions (bore, OD, width) or a reference drawing
• Operating speed, load (radial and axial), and expected life
• Environmental conditions (temperature, humidity, chemicals)
• Lubrication and sealing preferences
• Required tolerance class and noise level
• Annual quantity and target delivery schedule

If you have a failed bearing sample, our failure analysis team can identify the root cause and recommend a more suitable material or design.

Frequently Asked Questions

What is the difference between SUS420 and SUS440 angular contact bearings?

SUS440 has higher carbon content and can achieve higher hardness (HRC 58–60) and better wear resistance, while SUS420 offers slightly better corrosion resistance and is easier to machine. We recommend SUS420 for moderate loads and corrosive environments, and SUS440 for higher load or wear requirements.

Can you supply matched pairs or preloaded sets?

Yes, we can supply bearings as matched pairs (DB, DF, DT arrangements) with controlled preload and axial clearance. We mark each bearing and provide measurement data for the set.

What is the minimum order quantity for custom SUS420 angular contact bearings?

For standard sizes, MOQ is typically 500 pieces. For fully custom designs, we can start with 100 pieces for prototype validation, then scale to mass production.

Do you provide test reports with each shipment?

Yes, we include a quality certificate and, on request, detailed inspection reports for dimensions, noise, and vibration. Third-party SGS inspection is also available.

Can you help with bearing selection if I only have the application parameters?

Absolutely. Send us the operating conditions, load, speed, and mounting layout. Our engineers will calculate the required bearing size and configuration and propose a suitable SUS420 angular contact bearing.