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Technical Data: Miniature Ball Bearings

Technical Data: Miniature Ball Bearings

Technical information on high-quality miniature ball bearings that achieve sub-micron high precision is provided.

This document contains various technical information about "miniature ball bearings," which have become essential components in the rotating parts of various devices. It includes various technical details related to miniature ball bearings, such as different conversion methods and material properties. [Contents] ■ Conversions from the International System of Units (SI) ■ N-kgf conversion table ■ Inch-mm conversion table ■ Hardness conversion table ■ Physical and mechanical properties of metallic materials ■ Basic tolerances and IT values ■ Comparison table of part numbers with other manufacturers, including ISC/NSK *Please download and view the technical document from the link below.

  • Metal bearings
  • Ball bearings

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Bearing Technical Information: Materials

Bearing Technical Information: Materials

This introduces information about the raceway of bearings and the materials of rolling elements.

At NSK Micro Precision, we develop, manufacture, sell, and provide services for unit products that combine miniature ball bearings, miniature ball bearings, and precision machined components. The raceway and rolling elements of bearings undergo rolling contact with sliding while repeatedly receiving contact pressure. Therefore, multiple properties are required for the materials of the bearing's raceway and rolling elements. [Properties Required for the Materials of Bearing's Raceway and Rolling Elements] ■ High rolling fatigue strength ■ High hardness ■ High wear resistance ■ Good dimensional stability ■ High mechanical strength ■ Ease of processing ■ Heat and corrosion resistance depending on the application *For more details, please refer to the PDF materials or feel free to contact us.

  • Metal bearings
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Bearing Technical Information: Designation Number

Bearing Technical Information: Designation Number

This document introduces the contents and arrangement of the bearing's preliminary numbers.

This document introduces the "designation number" of bearings. The designation number of a bearing indicates the type of bearing, major dimensions, dimensional and rotational accuracy, internal clearance, and other specifications. It consists of a basic number and auxiliary symbols. The document includes a table showing the arrangement and content of the basic number and auxiliary symbols. [Contents (partial)] ■ Content and arrangement of bearing designation numbers *For more details, please refer to the PDF document or feel free to contact us.

  • Metal bearings
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Bearing Technology Information: Retainer

Bearing Technology Information: Retainer

This introduces the types of retainers used in bearings and the symbols for retainers.

This document introduces the "retainer" of bearings. Typically, wave-shaped retainers or crown-shaped retainers made of steel plates are used for small-diameter and miniature ball bearings. Wave-shaped retainers are used for bearings with relatively large dimensions, while crown-shaped retainers are used for bearings with smaller dimensions. This document includes illustrations of the types of retainers along with their symbols and names. [Contents] ■ Types of retainers and retainer symbols *For more details, please refer to the PDF document or feel free to contact us.

  • Metal bearings
  • Ball bearings

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Bearing Technology Information: Lubrication

Bearing Technology Information: Lubrication

This introduces the purpose of bearing lubrication and the lubrication methods.

This document explains the "lubrication" of bearings. The purpose of lubricating bearings is to reduce friction and wear inside the bearing and to prevent seizure. The benefits of lubrication include the reduction of friction and wear, extension of fatigue life, removal and cooling of friction heat, and prevention of foreign substances from entering the bearing. There are two lubrication methods: grease lubrication and oil lubrication. The document includes detailed information on these topics and introduces the characteristics of lubricating grease using tables. [Contents (partial)] ■ Purpose of lubrication ■ Lubrication methods *For more details, please refer to the PDF document or feel free to contact us.

  • Metal bearings
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Shaft-mounted bearing unit

Shaft-mounted bearing unit

It can be delivered in a shape that is easy to install on the equipment! We assist with the precise fitting of shafts and bearings, which can be troublesome in terms of dimensional management.

This is a shaft-mounted bearing that facilitates assembly onto equipment. It assists with the precise fitting of shafts and bearings, which can be cumbersome in terms of dimensional management. It can be delivered in a shape that makes installation onto equipment easy, allows for the setting of bearing clearance after press-fitting, manages the interference fit, and controls the resistance to loosening of the shaft and bearing through interference fit and press input. 【Features】 ■ Can be delivered in a shape that makes installation onto equipment easy ■ Allows for the setting of bearing clearance after press-fitting and manages interference fit ■ Controls the resistance to loosening of the shaft and bearing through interference fit and press input ■ Assists with the precise fitting of shafts and bearings, which can be cumbersome in terms of dimensional management ■ Please consult us regarding dimensions *For more details about the product, please download the PDF materials or contact us.

  • Metal bearings
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Miniature ball bearing with flange

Miniature ball bearing with flange

A deep groove ball bearing with a flange and a rim on one side. There is no need to provide a shoulder in the housing inner diameter, allowing for high-precision deep hole machining.

A "flanged bearing" is a deep groove ball bearing with a flange on one side of the outer ring. When using this bearing, there is no need to create a shoulder in the housing's inner diameter, allowing for high-precision through-hole machining. Since the side of the housing serves as the reference for installation, it is necessary to process the perpendicularity of the housing side accurately. 【Features】 ■ Bearing with a flange on one side of the outer ring ■ Can be installed with the side of the housing as the reference ■ No need to create a shoulder in the housing's inner diameter ■ Low-cost products used in office equipment, with various sizes available to suit different applications *For more details about the product, please download the PDF document or contact us.

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Bearing Technology Information: Preload

Bearing Technology Information: Preload

It is important to appropriately select the preload amount and preload method according to the application! Introducing preload for bearings.

This document explains the "preload" of bearings. When two bearings capable of receiving axial loads are installed as a pair, and a predetermined axial load F (preload) is always applied, this is referred to as applying preload. Bearings have internal clearances, but by applying preload, this clearance is eliminated, and the balls and raceways make elastic contact. As a result, the bearing is free from play due to clearance, reducing vibrations and noise during rotation, and increasing the rigidity of the bearing. [Contents (partial)] ■ Preload methods ■ Magnitude and direction of preload *For more details, please refer to the PDF document or feel free to contact us.

  • Metal bearings
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Bearing Technical Information: Accuracy of Main Dimensions and Rotational Accuracy

Bearing Technical Information: Accuracy of Main Dimensions and Rotational Accuracy

It introduces the accuracy of the main dimensions and rotational accuracy of bearings.

This document introduces the "accuracy of major dimensions and rotational accuracy" of bearings. The tolerances and allowable values for the major dimensions of small diameter ball bearings and miniature ball bearings, as well as rotational accuracy, comply with JIS B 1514 (Accuracy of rolling bearings) and ANSI/ABMA Std.12.2 (INSTRUMENT BALL BEARINGS INCH DESIGN). It also includes tables of tolerances and allowable values for the outer rings of ball bearings (metric system), as well as a list of major dimensions and rotational accuracy symbols. [Included Tables (Partial)] ■ Tolerances and allowable values for the inner rings of ball bearings, as well as tolerances and allowable values for the width of the outer rings. *For more details, please refer to the PDF document or feel free to contact us.

  • Metal bearings
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Bearing Technical Information: Fits and Clearances

Bearing Technical Information: Fits and Clearances

This introduces the "fit" and "clearance" of bearings.

This document introduces the "fit and clearance" of bearings. The fit conditions for incorporating bearings into equipment are extremely important for fully realizing the performance of the equipment. Additionally, the size of the internal clearance during bearing operation significantly affects the bearing's performance, including fatigue life, vibration, noise, and heat generation. Therefore, it is necessary to select an appropriate radial internal clearance considering the fit, bearing load, rotational speed, and bearing temperature during operation. Furthermore, the document presents information on fits, including the fit between the inner ring and the shaft, as well as the fit between the outer ring and the housing bore, using tables and examples. [Contents (partial)] ■ Fit *For more details, please refer to the PDF document or feel free to contact us.

  • Metal bearings
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Bearing Technology Information: Bearing Lifespan

Bearing Technology Information: Bearing Lifespan

It introduces the lifespan of bearings, as well as the basic dynamic load ratings and fatigue life.

This document explains the "lifetime of bearings." Even when rolling bearings are used correctly for a specific application, after a certain period of time, they may become unusable due to increased noise and vibration, decreased accuracy from wear, degradation of the lubricating grease, and fatigue of the rolling surfaces. The period until they become unusable is referred to as the broad definition of bearing lifetime, which includes terms such as acoustic lifetime, wear lifetime, grease lifetime, and rolling fatigue lifetime. Additionally, the basic dynamic load rating of bearings and fatigue lifetime are also explained using calculation formulas. [Contents (partial)] ■ Lifetime of bearings ■ Basic dynamic load rating and fatigue lifetime *For more details, please refer to the PDF document or feel free to contact us.

  • Metal bearings
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[Bearing Technical Information] Types and Features of Small Diameter Ball Bearings and Miniature Ball Bearings

[Bearing Technical Information] Types and Features of Small Diameter Ball Bearings and Miniature Ball Bearings

We have published the features of various types, including pivot ball bearings and grooved thrust ball bearings.

This document introduces "Types and Features of Small Diameter Ball Bearings and Miniature Ball Bearings." Small diameter ball bearings and miniature ball bearings, including precision ball bearings for instruments, can basically be classified into deep groove type and angular type. Typical deep groove bearings include those with an outer ring flange, wide inner rings, thin cross-sections, and specially shaped bearings for synchronization, which are further distinguished by the presence or absence of seals and shields into open type, sealed type, and shielded type. The characteristics of various bearings are illustrated and presented. [Content (partial)] ■ Dimension range of small diameter and miniature ball bearings *For more details, please refer to the PDF document or feel free to contact us.

  • Metal bearings
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Bearing Technical Information: Allowable Rotational Speed

Bearing Technical Information: Allowable Rotational Speed

As bearing technical information, we introduce the permissible rotational speed of bearings.

Each bearing has a limit to its rotational speed. When a bearing is operated, as the rotational speed increases, the temperature rise due to frictional heat inside the bearing becomes greater. The limit of rotational speed is an empirical tolerance value that allows the bearing to continue operating without causing seizure or excessive heat generation beyond a certain limit. Therefore, the permissible rotational speed for each bearing varies depending on the type and dimensions of the bearing, the type and material of the cage, the bearing load, the lubrication method, the lubricant, and the cooling conditions surrounding the bearing. [Key Points] - Each bearing has a limit to its rotational speed. - The limit of rotational speed is an empirical tolerance value that allows the bearing to continue operating without causing seizure or excessive heat generation beyond a certain limit. *For more details, please refer to the PDF document or feel free to contact us.*

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High-precision miniature guide follower

High-precision miniature guide follower

A guide follower with an extremely small diameter that uses two high-precision miniature ball bearings from our company. Ideal for low-torque, lightweight transport equipment!

The "Guide Follower" is a guide follower with an extremely small diameter that uses our company's high-precision miniature ball bearings. It uses two high-precision miniature ball bearings. Additionally, we offer an integrated outer ring type and can accommodate special dimensions. It is suitable for small transport devices and more. 【Features】 ■ Uses our company's high-precision miniature ball bearings ■ Extremely small diameter ■ Uses two high-precision miniature ball bearings ■ Available in an integrated outer ring type ■ Can accommodate other special dimensions ■ Included parts: stainless steel hex nut *For more details about the product, please download the PDF document or contact us.

  • Metal bearings
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Thrust Angular Bearing Croxy

Thrust Angular Bearing Croxy

Miniature thrust angular ball bearings suitable for applications with high axial loads. Ideal for vertical axis use, such as support for ball screws!

"Croxy" is a miniature thrust angular ball bearing suitable for applications with high axial loads. It features angularization of the JIS standard 69 series, downsizing of the ball screw support section, and achieves approximately three times the rigidity compared to conventional deep groove ball bearings. Examples of applications include support for ball screws, support for electric actuators, and support for robotic arms. 【Features】 - Angularization of the JIS standard 69 series - Downsizing of the ball screw support section - Achieves approximately three times the rigidity compared to conventional deep groove ball bearings (compared to our products) - Maintenance-free design achieved with high-performance grease sealing and double shield type - Easy installation provided with pre-loaded combinations (recommended tightening torque will be included with the product) - Lineup of anti-fretting grease (EA7) and cleaning grease (LG2) - Standard accuracy grade P5 *For more details about the product, please download the PDF document or contact us.

  • Metal bearings
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[Free Giveaway] Comprehensive Catalog of Miniature Ball Bearings

[Free Giveaway] Comprehensive Catalog of Miniature Ball Bearings

We offer over hundreds of miniature ball bearings, ranging from ultra-small types with an inner diameter of 1.0mm and an outer diameter of 3.0mm to sizes around an outer diameter of 20mm!

Miniature ball bearings are now essential components in the rotating parts of various equipment. As the downsizing of equipment progresses, there is an increasing demand for smaller, thinner, and quieter designs. NSK Micro Precision Co., Ltd. manufactures a variety of ball bearings tailored to meet these needs. ■ Size Types From ultra-small types with an inner diameter of 1.0mm and an outer diameter of 3.0mm to larger sizes around 20mm in outer diameter, including special types, there are hundreds of varieties. ■ Catalog Contents The "Miniature Ball Bearing Comprehensive Catalog" includes the most commonly used radial ball bearings composed of an inner ring, outer ring, balls, cage, and seals, such as "Single Row Deep Groove Ball Bearings," deep groove ball bearings with a flange on one side of the outer ring, "Flanged Deep Groove Ball Bearings," inch series deep groove ball bearings with a wider inner ring than the outer ring, "Wide Inner Ring Deep Groove Ball Bearings," and deep groove ball bearings with a smaller outer diameter-to-inner diameter ratio than standard, "Thin-Walled Deep Groove Ball Bearings," among many others. ★ For more details, please download the catalog or contact us.

  • Metal bearings
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High corrosion-resistant bearing Castop

High corrosion-resistant bearing Castop

A bearing that achieves groundbreaking corrosion resistance and load-bearing performance. Adopted in environments where chemical solutions with pH 3 to pH 12 are present (such as medical devices and food machinery)!

Castop is a bearing that achieves load-bearing performance with a unique heat treatment technology using the newly developed material TBN-6H, which demonstrates corrosion resistance superior to conventional stainless steel SUS440C. Thanks to the addition and adjustment of appropriate components (4 chemical components × trace elements), this newly developed material realizes a dramatic improvement in corrosion resistance over SUS440C. Furthermore, with our unique heat treatment technology achieving HRC60, and through the optimization of internal specifications, it exhibits load-bearing performance equal to or greater than that of SUS440C. We provide high reliability and long operational life for various equipment in saline, rainwater, and alkaline environments. 【Features】 ■ The newly developed material, born from the addition and adjustment of appropriate components (4 chemical components × trace elements), achieves dramatic corrosion resistance surpassing SUS440C. → Newly developed high-corrosion-resistant martensitic stainless steel TBN-6H ■ Achieves HRC60 with our unique heat treatment technology ■ Exhibits load-bearing performance equal to or greater than that of SUS440C through optimization of internal specifications ■ Provides high reliability and long operational life for various equipment in saline, rainwater, and alkaline environments *For product details, please download the PDF materials or contact us.

  • Metal bearings
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[Digest Version] Miniature Ball Bearing Catalog

[Digest Version] Miniature Ball Bearing Catalog

Introducing a catalog that explains ISC's miniature ball bearings!

SEKI Corporation is a trading company specializing in domestic and imported bearings. This catalog is a digest version that introduces and explains miniature ball bearings under the brand ISC of NSK Micro Precision Co., Ltd. It includes the types and features of small-diameter and miniature ball bearings, as well as the accuracy of key dimensions, rotational accuracy, and bearing lifespan. We also provide supplementary tables such as bearing dimension tables and conversions from the International System of Units (SI). [Contents] ■ Explanation - Types and features of small-diameter/miniature ball bearings - Designation numbers - Retainers - List of key dimensions and rotational accuracy symbols - Accuracy of key dimensions and rotational accuracy, etc. *This PDF document is a digest version. Please contact us if you need the full version.

  • Company：SEKI
  • Price：Other
  • Metal bearings
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