IJK (Inoue Jikuuke Kogyo), has been an important manufacturing company in Japan for over 7 decades. IJK manufactures standard to extremely high precision ball bearings. IJK is known for its custom-designed bearing manufacturing capabilities.


While IJK is a quality stand alone bearing brand it is intimately linked to NSK bearing company. It is reported that historically at least 70 % of the IJK production is made solely for the NSK-bearing companies’ consumption. The good news is you can be assured of NSK quality when you purchase IJK bearings from Pacific International Bearing Sales Inc.

Company History

IJK Bearings, established in 1944 as Nihon Jikuuke Kogyo Co., Ltd., changed its name to Inoue Jikuuke Kogyo Co., Ltd. in 1949. The company has a rich history of innovation and recognition, such as receiving JIS markings permission in 1958 and various awards for excellence in industrial standardization and quality control. The company earned recognition for its commitment to quality and industrial standardization, winning awards from the Osaka Trade and Industry Bureau and the Osaka Governor. In the 1960s, it formed a key business alliance with NSK Ltd. and expanded its production facilities. The following decades saw the company’s focus on international standards, environmental responsibility, and technological advancements, leading to the development specialized plants and solar power initiatives. IJK expanded its facilities and received numerous certifications, including ISO 9002, 9001, and TS 16949. Notably, they ventured into solar power generation in 2014.

Tondabayashi Plant (Head Office)
Fig 1. Tondabayashi Plant (Head Office)
Mihara Plant
Fig 2. Mihara Plant

IJK Ball Bearing Types

Angular-contact ball bearings; Single-row, deep-groove ball bearings (small and medium diameter); Steering ball bearings; Self-aligning ball bearings; Multi-row, angular-contact ball bearings; Magneto ball bearings; and Special application bearings. Each type of bearing from IJK offers unique advantages and is engineered to meet specific mechanical demands, ensuring efficiency.

Special Application Bearings
These bearings are designed for specific applications where standard bearings are not suitable. IJK’s special application bearings often feature advanced materials, unique geometries, and specialized lubrication to meet the demanding requirements of these applications. IJK  special application bearings are currently applied in high-speed machinery, in extreme temperatures, and in corrosive environments.

Double-row, Angular-contact Ball Bearings
This type of IJK  bearing features two rows of balls set at an angle to support both axial and radial loads. IJK’s double-row, angular-contact ball bearings are known for their ability to handle high loads and provide excellent stiffness. They are commonly used in gearboxes, pumps, and other applications where high precision and varying load handling is required.

Double Row Angular-contact Ball Bearings
Fig. 3 Double Row Angular-contact Ball Bearings

Magneto Ball Bearings
IJK’s magneto ball bearings are a type of single-row deep-groove ball bearings but with a shallow groove that allows for a smaller contact angle. They are specifically designed to handle moderate radial loads and low axial loads in one direction. Common applications include electric motors and generators where compactness and minimal axial space are key requirements.

IJK Magneto Bearings
Fig. 4 IJK Magneto Bearings

Self-aligning Ball Bearings
These bearings are designed to tolerate misalignment of the shaft with respect to the housing.
IJK’s self-aligning ball bearings include two rows of balls and a common sphered raceway in the outer ring, allowing the bearing to be misaligned relative to the housing. This feature makes them ideal for applications where misalignment might occur due to errors in mounting or shaft deflection.

Single-row, Deep-groove Ball Bearings
These are the most widely used type of bearing. IJK’s single-row, deep-groove ball bearings are characterized by their deep, uninterrupted raceway grooves. This design allows them to support both radial and axial loads, making them versatile for a wide range of applications, including electric motors, household appliances, and the automotive industry.

IJK Single Row Radial Ball Bearings
Fig. 5 IJK Single Row Radial Ball Bearings

IJK Self Aligning Ball Bearings
Self-aligning ball bearings have functions to accommodate angular misalignment of the shaft, which can be caused by errors in mounting or shaft deflection. Major applications: transmission shafts of spinning machinery and X-ray tubes.

IJK Self Aligning Ball Bearing
Fig. 6 IJK Self Aligning Ball Bearing

Are you interested in learning more about the precision and quality of IJK Bearings? Our specialists at PIB Sales are here to provide you with all the information and guidance you need. Whether you have questions about specific bearing types or need advice on the best options for your application you should contact us at [email protected]. You can also visit our website to purchase IJK brand bearings.

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