SUS440 Flange Bearings Manufacturers

We are Jiangsu Yinghong Transmission Technology Co., Ltd., a professional manufacturer of precision special bearings in China and the company behind the YHU brand. Our SUS440 Flange Bearings are made for compact drive systems where one component must provide rotary support and axial location without a separate housing shoulder. The catalogue range covers SF60, SF62, SF63, SF68 and SF69 series, all produced from hardened SUS440 martensitic stainless steel and available in plain, shielded and sealed configurations.

As a Wholesale SUS440 Flange Bearings Factory, we control the full flow from material receiving and heat treatment through grinding, assembly, grease filling and final noise and vibration testing. This lets us supply standard sizes and project-specific modifications through the same production control system.

What the Range Covers

SUS440 flange bearings belong to our Stainless Steel Flanged Bearings family. The flange profile is integrated into the outer ring, giving the bearing a locating face for axial positioning in a housing or a direct surface for bolted retention. For OEM assemblies this reduces parts count and removes the need to machine an additional shoulder into the housing.

Depending on the application, we recommend:

• SF60 series for compact instruments and light-duty motors.
• SF62 series for power tools and small gearbox outputs.
• SF63 series for heavier industrial drives.
• SF68 series for extra-thin assemblies where axial space is limited.
• SF69 series for robotics, drones and medical devices where weight and stiffness need to be balanced.

Material Behaviour and Application Fit

SUS440 is a high-carbon martensitic stainless steel closely related to 440C. Rings and balls made from SUS440 can be hardened to a high level, giving the bearing good wear resistance and the ability to handle higher contact loads than standard 304 stainless steel. This makes the range a strong choice for motors, drives, instruments and automation equipment where compactness, hardness and corrosion resistance are all required.

Where the environment is dominated by washdown, chlorides, seawater or aggressive chemicals, SUS316 or one of our specialty stainless steel flange bearings is usually the better material. We help you make that call before quoting by reviewing the working point, cleaning cycle, exposure medium and target service life. For applications that do not need stainless steel, the same SF design is available in our Flanged Bearings programme in bearing steel.

Manufacturing and Quality Control

Our production base operates nearly 10,000 square metres of manufacturing space with automated lines and high-precision testing equipment. We have adopted Japanese precision manufacturing technology and apply it to the SUS440 flange bearing process, from turning and heat treatment to grinding, lapping and final assembly.

Quality control covers dimensional accuracy, radial clearance, axial play, running noise, vibration, sealing integrity and corrosion resistance. The company holds IATF 16949, RoHS, CE and SGS certification, and our YHU bearings are designed to deliver low noise, low vibration and long service life in demanding operating environments.

Configuration and Automation Integration

Because flange bearings are often used in high-volume products, we configure the bearing around the production line rather than forcing a catalogue fit. We can adjust bore and outer diameter limits, flange outer profile, mounting hole pattern, seal type, grease specification, preload and cage material. For multi-spindle machines and automated assembly, we supply matched sets with controlled dimensions so the press-fit behaviour stays consistent from lot to lot.

Typical seal options include open, metal-shielded and rubber-sealed configurations. Grease is selected according to operating temperature, speed and torque requirements. Our stainless steel bearing programme is designed for temperatures from -253°C to 350°C, with the actual limit depending on the cage, seal and lubricant selected for the project.

Installation, Maintenance and Acceptance

For pressed-in flange bearings, we recommend applying assembly force to the outer ring only. The flange face should sit square to the housing bore to avoid distorting the raceway. In maintenance planning, the flange simplifies removal because the outer ring can be pushed out from the reverse side after the locating face is released.

We agree acceptance criteria at the quotation stage. Dimensional reports, noise and vibration readings, radial clearance values and seal checks can be documented per batch or per part. For export shipments, we use rust-preventive packaging appropriate for the shipping route and storage period.

Information We Use to Configure Your Solution

To prepare a precise proposal, send us the following or attach a drawing with the critical dimensions marked:

• Shaft and housing bore diameters, plus flange outer diameter and thickness
• Mounting hole pattern or locating face requirement
• Operating speed, radial load and axial load
• Environment: temperature, humidity, washdown, chemicals or particulates
• Noise or vibration limit if specified by the end application
• Required precision class, radial clearance and torque behaviour
• Seal and lubricant preference, or the duty cycle for our recommendation
• Target quantity, packaging format and required documentation

With those parameters, we provide a configuration that matches the application rather than a generic catalogue bearing. Prototype production and mass delivery are supported by the same engineering and quality system.

Frequently Asked Questions

What is the difference between SUS440 and SUS304 or SUS316 flange bearings?

SUS440 offers higher hardness and better wear resistance, which suits loaded, high-speed or abrasive conditions. SUS304 and SUS316 provide better corrosion resistance, with SUS316 preferred for chloride and seawater exposure. We match the material to the actual environment and load profile during the quotation review.

Can you customize the flange geometry or mounting holes?

Yes. We regularly adjust flange outer profile, thickness and hole position for OEM housings. Send the housing drawing or flange dimensions, and our engineering team will confirm whether the change can be made without affecting the raceway geometry.

What seal and lubricant options are available?

We supply open, metal-shielded and contact-sealed versions. Grease is selected for temperature, speed and noise requirements, including low-torque and extended-life options. The final recommendation is based on the operating point you provide.

Do you support prototypes before mass production?

Yes. Our process covers solution design, prototype production, mass delivery and after-sales technical support. For a custom SUS440 flange bearing, a prototype lot allows you to verify fit, running noise and assembly behaviour before committing to full volume.

What documentation can you provide with the bearings?

We can provide dimensional inspection reports, material certificates, noise and vibration test data, and certificates related to our IATF 16949, RoHS, CE and SGS quality systems. The specific document set is agreed when the order is confirmed.

Related Products and Categories

Our portfolio also includes Products for applications with different operating ranges, interfaces or integration requirements.