SUS304 Flange Bearings Manufacturers

Product Range and Positioning

We manufacture a complete series of SUS304 flanged bearings in both metric and inch dimensions, covering bore sizes from miniature to small industrial ranges. The SFR series is our standard offering, with variants such as SFR1-4, SFR133, SFR1-5, SFR144/SFR2-5/SFR2-6/SFR2/SFR2A, SFR155, SFR156/SFR166/SFR3/SFR3A, SFR168/SFR188/SFR4/SFR4A, SFR1810, SFR6/SFR1038, and SFR8. Each series is designed for specific load and speed profiles, and we also produce custom flange geometries to match non-standard housings.

All bearings are available with open, shielded (ZZ), or sealed (2RS) configurations, and we can supply with food-grade grease or high-temperature lubricants on request.

Material and Performance Characteristics

SUS304 is an austenitic stainless steel with 18% chromium and 8% nickel, offering excellent corrosion resistance in atmospheric, fresh water, and many chemical environments. In the annealed condition it is non-magnetic, which is essential for sensitive electronic and medical applications. Our bearings are manufactured from certified SUS304 bar and tube stock, and we maintain full material traceability.

• Corrosion resistance: withstands moisture, mild acids, and alkalis without surface pitting.
• Non-magnetic: ideal for MRI equipment, electron microscopes, and navigation systems.
• Temperature range: reliable operation from -60°C to +250°C with appropriate lubricant.
• Low noise and vibration: our precision grinding and assembly processes ensure smooth, quiet running.

For more aggressive chemical exposure, we also offer SUS316 Flange Bearings and SUS440 Flange Bearings for higher hardness or enhanced pitting resistance.

Application Fit and Industry Use

Our SUS304 flange bearings are used across a wide spectrum of industries where stainless steel is mandatory for hygiene, corrosion resistance, or non-magnetic properties. Typical applications include:

We also supply these bearings to the semiconductor, aerospace, and textile industries where cleanroom compatibility and non-magnetic properties are essential.

Engineering and Customization

Our engineering team works directly with your drawings or samples to develop custom flange bearings that meet exact dimensional, load, and environmental requirements. We can modify:

• Bore diameter, outer diameter, and width (within standard envelope or fully custom)
• Flange diameter, thickness, and mounting hole pattern
• Raceway geometry and ball complement for specific load ratings
• Shield and seal types (contact, non-contact, labyrinth)
• Lubrication (grease type, fill quantity, food-grade, low-temperature)
• Surface finish and passivation for enhanced corrosion resistance

We use Japanese precision manufacturing technology and automated production lines to ensure consistency from prototype to mass production. Our in-house R&D team supports bearing design optimization and failure analysis.

Quality Assurance and Compliance

Quality is embedded in every stage of our production, from incoming material inspection to final noise and vibration testing. Our factory is equipped with high-precision measuring instruments and a closed-loop quality management system. We hold IATF 16949, RoHS, CE, and SGS certifications, and we provide material certificates and inspection reports with each shipment.

Every SUS304 flange bearing is tested for dimensional accuracy, radial clearance, and running noise. We also perform corrosion spot tests on a sampling basis to verify material grade. Our quality system ensures that bearings leaving our factory meet the strictest tolerances for miniature and small-size applications.

Information We Use to Configure Your Solution

To prepare a precise quotation and engineering proposal, we need the following project data. The more complete the information, the faster we can respond with a suitable configuration.

For non-standard designs, we can produce prototypes within a short lead time and then scale to mass production. Our team provides full technical support from design review to after-sales service.

Frequently Asked Questions

What is the difference between SUS304 and 304 stainless steel?

SUS304 is the Japanese JIS designation for the same material as ASTM 304. Both have identical chemical composition (18% Cr, 8% Ni) and mechanical properties. The only difference is the standard system used for documentation. Our bearings are manufactured to JIS G4305 specifications and we provide material certificates confirming compliance.

Are SUS304 flange bearings non-magnetic?

In the annealed condition, SUS304 is essentially non-magnetic. However, cold working during bearing manufacturing (such as grinding and forming) can induce slight magnetism in the raceways. If strict non-magnetic performance is required, we can apply a final solution annealing treatment or use a higher alloy grade like SUS316. We will discuss your specific requirement during the proposal stage.

Can you customize the flange mounting holes?

Yes. We can produce flange bearings with custom hole patterns, including different hole diameters, number of holes, and angular positions. Our CNC machining ensures accurate hole placement, and we can also add counterbores or threaded holes if needed.

What is the typical lead time for custom SUS304 flange bearings?

For standard sizes, we maintain stock and can ship within 7–15 days. Custom designs require prototype approval, typically 2–4 weeks for samples and 4–6 weeks for mass production, depending on complexity and quantity. We work with your schedule to meet project deadlines.

Do you provide test reports and certifications with shipments?

Yes. Each shipment includes a material certificate, dimensional inspection report, and noise/vibration test data. We also provide SGS test reports upon request. Our quality system is IATF 16949 certified, and all products comply with RoHS and CE directives.

Can you supply bearings for food processing equipment?

Absolutely. We offer food-grade grease options and can provide bearings with FDA-compliant lubricants. The SUS304 material is suitable for washdown environments, and we can add special seals to prevent ingress of water or cleaning agents.