NSKマイクロプレシジョン List of Products and Services

The "Traction Drive" is a quiet reduction gear equipped with our own high-precision miniature ball bearings. It is lightweight, compact, and excels in quietness, making it suitable for various applications such as small robots, drones, and industrial machinery. 【Features】 ■ Reduction ratio of 10 (single-stage transmission) ■ Input/output shaft diameter Φ2 to Φ8 ■ Product weight 50 to 500g (reference value) ■ Low vibration and low noise ■ Small rotational variation and backlash *For more details about the product, please download the PDF document or contact us.

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Each bearing has a limit to its rotational speed. When a bearing is operated, as the rotational speed increases, the temperature rise due to friction heat inside the bearing becomes greater. The limit of rotational speed is an empirical allowable value that allows the bearing to continue operating without causing seizure or excessive heat generation beyond a certain limit. Therefore, the allowable 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 allowable 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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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, which reduces vibrations and noise during rotation, and also increases 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.

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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 can no longer be used 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 rated load of bearings and fatigue lifetime are also explained using calculation formulas. [Content Overview (Partial)] ■ Lifetime of bearings ■ Basic dynamic rated load and fatigue lifetime *For more details, please refer to the PDF document or feel free to contact us.

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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 reduced friction and wear, extended 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 provides 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.

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NSK Micro Precision develops, manufactures, sells, and provides services for unit products that combine miniature ball bearings, miniature ball bearings, and precision machined parts. The raceway and rolling elements of the bearing 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 the 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 document or feel free to contact us.

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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 performance of the bearing, 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 includes tables and examples introducing the fit between the inner ring and the shaft, as well as the fit between the outer ring and the housing hole. [Content Overview (Partial)] ■ Fit *For more details, please refer to the PDF document or feel free to contact us.

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This document introduces the "accuracy of major dimensions and rotational accuracy" of bearings. The tolerances and permissible 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 permissible values for the outer rings of ball bearings (metric system), as well as a list of major dimensions and symbols for rotational accuracy. [Included Tables (Partial)] ■ Tolerances and permissible values for the inner rings of ball bearings, as well as tolerances and permissible values for the width of the outer rings. *For more details, please refer to the PDF document or feel free to contact us.

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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.

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This document introduces the "designation number" of bearings. The designation number for shaft bearings is a name that 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. 【Content included (partial)】 ■ Content and arrangement of bearing designation numbers *For more details, please refer to the PDF document or feel free to contact us.*

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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 outer ring flanges, 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 alongside each description. [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.

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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 like ISC/NSK *Please download and view the technical document from the link below.

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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 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.

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The "Ice Slide" is a linear motion product that uses six high-precision miniature ball bearings to achieve smooth operation. Thanks to its pre-load design, it eliminates any play between the slider and the rail, achieving "zero" play. It can be used regardless of the installation direction. The rail width is available in three types: 20mm, 25mm, and 37mm. 【Features】 ■ Suitable for light load sliding sections ■ Smooth operation achieved through the rotational motion of the bearings ■ Easy installation on various devices ■ Simple design for low cost *For more details, please refer to the materials. Feel free to contact us with any inquiries.

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"Full Ride" is a roller-type linear motion product that uses our self-developed miniature thrust angular ball bearing, Croxy. Thanks to the smooth rotation of Croxy, it achieves excellent quietness and low friction, and its simple structure makes it easy to handle. (It is compatible with belt-type actuators.) 【Features】 ■ Smooth linear motion and high load capacity achieved through the smooth rotation of Croxy ■ High load capacity using miniature thrust angular bearings ■ Compatible with belt-type actuators ■ Roller type with low noise *For more details about the product, please download the PDF document or contact us.

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The "resin-coated bearing" is a bearing made by molding polyacetal resin onto the outer ring of a miniature ball bearing. A creep prevention ring is installed on the inner ring of the bearing, improving the creep resistance between the inner ring's inner diameter and the shaft. Additionally, high precision is achieved through machining. The material of the outer ring resin is primarily polyacetal resin, but it can also accommodate other types of resin. 【Features】 ■ Bearing made by molding polyacetal resin onto the outer ring of a miniature ball bearing ■ Creep prevention ring installed on the inner ring, enhancing creep resistance between the inner ring's inner diameter and the shaft ■ Outer ring resin's strength is improved through insert molding ■ The width of the inner ring is made larger than the outer diameter width, facilitating installation

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"Flanged bearings" are deep groove ball bearings with a flange on one side of the outer ring. When using this bearing, there is no need to provide 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 provide a shoulder in the housing's inner diameter ■ Low-cost products used in office equipment, available in various sizes to suit different applications *For more details about the product, please download the PDF document or contact us.

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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, allowing for the setting of bearing clearance after press-fitting, management of the interference fit, and control of the shaft and bearing's resistance to loosening 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 management of the interference fit ■ Resistance to loosening of the shaft and bearing is managed 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.

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The "Dental High-Speed Bearing" is a high-performance dental bearing developed by ISC through the development of new materials, appropriate material selection, and ultra-precision processing technology. ISC's bearings play a vital role as key components in dental handpieces, which require ultra-high precision and high-speed rotation. They can handle speeds from 450,000 RPM to a maximum of 500,000 RPM, achieving high corrosion resistance through the use of new steel materials (ES-1). 【Features】 ■ Capable of handling speeds from 450,000 RPM to a maximum of 500,000 RPM ■ Achieves high corrosion resistance by using new steel materials (corrosion-resistant stainless steel) ■ High resistance to high-temperature and high-pressure sterilization processes due to the use of polyamide-imide material retainers ■ Can also be manufactured with ceramic balls *For more details about the product, please download the PDF document or contact us.

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The "Smallest Bearing" is a miniature version of a standard bearing, retaining the same structure to the extreme limit, and features a retainer. It meets the international standard for bearings, "AFBMA ABEC-5 (JIS P5) grade," as a super-precise, silent ball bearing. Previously, our smallest mass-produced bearing had an outer diameter of 4mm, but due to market demand, we have recently developed even smaller bearings with outer diameters of 3.5mm and 2.9mm. 【Features】 ■ Super-precise silent ball bearing ■ Meets the international standard "AFBMA ABEC-5 (JIS P5 grade)" ■ Made from stainless material that is resistant to rust ■ Awarded by outstanding craftsmen (modern masters) ■ Recipient of the Yellow Ribbon Medal *For more details about the product, please download the PDF document or contact us.

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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 similar applications. 【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.

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"Crookport" is a product series that features lightweight, compact, and high-rigidity support units designed for miniature ball screw support with diameters ranging from 3 to 8 mm. It contributes to a 60% reduction in weight, downsizing of equipment, lightweight design, and high responsiveness. Equipped with the Crooksy series of miniature angular ball bearings, which are precisely managed for pre-load, it achieves high axial rigidity. [Features] - 60% weight reduction (compared to Crookport MSU-6C) - Contributes to downsizing, lightweight design, and high responsiveness of equipment - Equipped with the Crooksy series of miniature angular ball bearings, precisely managed for pre-load, achieving high axial rigidity - Shaft center height is the same as standard products - Axial load performance is equal to or greater than (all model numbers) *For more product details, please download the PDF document or contact us.

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"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 with high-performance grease sealing and double shield type - Easy installation with pre-loaded combinations provided (recommended tightening torque will be included with the product) - Lineup of anti-fretting grease (EA7) and cleaning grease (LG2) - Standard precision grade P5 *For more details about the product, please download the PDF document or contact us.

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Castop is a bearing that achieves load-bearing performance with a unique heat treatment technology applied to the newly developed material TBN-6H, which demonstrates corrosion resistance exceeding that of conventional stainless steel SUS440C. Through the adjustment of appropriate components (4 chemical components × trace elements), this newly developed material achieves remarkable corrosion resistance that surpasses SUS440C. Furthermore, with our unique heat treatment technology, we achieve HRC59, optimizing internal specifications to exhibit 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, created through the adjustment of appropriate components (4 chemical components × trace elements), achieves remarkable corrosion resistance that surpasses SUS440C. → Newly developed high-corrosion-resistant martensitic stainless steel TBN-6H ■ Achieves HRC59 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 document or contact us.

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The "urethane-coated bearing" is a rubber roller that has urethane rubber directly bonded to the outer diameter of a miniature ball bearing. The outer diameter is finished with grinding, ensuring high precision, low vibration, and low noise. It meets the demands of feeding mechanisms that require high precision, low vibration, and low noise. 【Features】 ■ Rubber is directly bonded to the outer diameter of the bearing ■ The outer diameter is finished with grinding ■ High precision, low vibration, low noise ■ Standard dimensions are available ■ We also accommodate special dimensions and material changes *For more details about the product, please download the PDF document or contact us.

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