S68 Series SUS420 Stainless Steel Bearings

This bearing is manufactured from SUS420 martensitic stainless steel and is designed specifically for applications requiring high rotational speeds within extremely limited spaces. Its standout feature is a thin-walled structure; while retaining the fundamental load-bearing capacity of deep-groove ball bearings, the 68 series significantly reduces radial cross-sectional dimensions, thereby effectively lowering the overall weight and rotational inertia of the assembly. 

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Bearing Features

Thanks to the high-carbon 420 material and a precision quenching process, the bearing achieves a hardness exceeding HRC50, demonstrating excellent wear resistance and compressive strength. In terms of performance, the series offers low starting torque and high rotational precision, making it ideal for use in precision medical devices, micro-fans, and precision encoders. It provides superior rust resistance compared to standard chrome steel, ensuring stable long-term operation in moderately humid or condensing environments, while the tight fit between the inner/outer rings and rolling elements guarantees low-noise performance during high-speed operation.

Technical Specifications

Bearing Reference Boundary Diameters Basic Dynamic Basic Static Limiting Speeds
Flange Open  Shield  d
mm
D
mm
Df
mm
B
mm
Bf
mm
B1
mm
Bf1
mm
rsmin
mm
Cr(kN) Cor(kN) Grease Oil
F S681 - 1 3 3.8 1 0.3 - - 0.05 0.074 0.02 16.5 18.5
F S682 ZZ 2 5 6.1 1.5 0.5 2.3 0.6 0.08 0.167 0.049 9.4 10.6
F S683 ZZ 3 7 8.1 2 0.5 3 0.8 0.1 0.314 0.108 6.6 7.4
F S684 ZZ 4 9 10.3 2.5 0.6 4 1 0.1 0.637 0.225 5.1 5.7
F S685 ZZ 5 11 12.5 3 0.8 5 1 0.15 0.715 0.284 4.1 4.6
F S686 ZZ 6 13 15 3.5 1 5 1.1 0.15 1.08 0.441 3.5 3.9
F S687 ZZ 7 14 16 3.5 1 5 1.1 0.15 1.18 0.51 3.1 3.5
F S688 ZZ 8 16 18 4 1 5 1.1 0.2 1.25 0.588 2.8 3.1
F S689 ZZ 9 17 19 4 1 5 1.1 0.2 1.32 0.666 2.5 2.8

About Us

Jiangsu Yinghong Transmission Technology Co., Ltd. (YHU) was established in 2024 through the joint investment of Dongguan Yinghong, Linqing Boshuo, and Yancheng Jiwei. As a group-based enterprise specializing in the research, development, manufacturing, and service of transmission products, we leverage extensive industry experience and strong technical expertise to provide reliable, energy-efficient transmission solutions for customers worldwide.

The company covers more than 70 mu of land and operates nearly 10,000 square meters of manufacturing facilities. As a professional manufacturer of precision special bearings in China, we have introduced advanced Japanese precision manufacturing technology and equipped our facility with automated production lines and high-precision testing equipment. A comprehensive quality management system ensures consistent product quality and reliable performance.

As a National High-Tech Enterprise, Yinghong holds multiple invention and utility model patents and has obtained internationally recognized certifications including IATF 16949, RoHS, CE, and SGS. These certifications enable us to meet diverse customer requirements and provide effective solutions for demanding applications and complex technical challenges.

We specialize in the production of high-precision deep groove ball bearings and custom non-standard bearings under our registered trademark, “YHU”. Our main products include bearing steel bearings, stainless steel bearings, ceramic bearings, and plastic bearings.

YHU bearings are designed to deliver low noise, low vibration, low friction, high precision, great sealing performance, and high-speed operation. They also offer self-lubrication, corrosion resistance, rust resistance, acid and alkali resistance, chemical resistance, electrical insulation, non-magnetic properties, high-temperature resistance, low-temperature adaptability, and long service life, making them suitable for demanding operating environments.

Our bearings and bearing assemblies are widely used in electric motors, power tools, pneumatic tools, robotics, drones, household appliances, precision instruments, semiconductor equipment, medical devices, marine equipment, aerospace applications, financial equipment, textile machinery, fishing equipment, and a wide range of specialized industrial equipment.

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