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EXSEV Bearings and Ceramic Bearings Series

EXSEV / JTEKT Corporation (Official website)

A bearing series for special environments such as clean, vacuum, high-temperature and corrosive conditions, and for applications requiring special performance such as non-magnetic, insulating or high-speed operation. Includes ceramic bearings using silicon nitride and special steel bearings.

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Specifications

Density of Silicon Nitride 3.2 g/cm3
Vickers Hardness of Silicon Nitride 1500 HV
Heat Resistance of Silicon Nitride (In Air) 800 ℃
Longitudinal Elastic Modulus of Silicon Nitride 320 GPa

How to choose Rolling Bearings

Points to check when selecting, with the values for this product (EXSEV Bearings and Ceramic Bearings Series).

  1. 1. Bore and housing bore dimensions

    Select the bore diameter d to match the shaft seat, the outside diameter D to match the housing bore, and the width B to suit the installation space. Main dimensions are standardized in ISO and JIS dimension series, so interchangeable products can be found by boundary dimension designation. For tapered roller bearings, also check the assembled width T; for thrust bearings, also check the height H.

  2. 2. Dynamic load rating based on life calculation

    The basic dynamic load rating Cr is the reference value for calculating rated life. Verify that the required life is met using the equivalent load during operation and the rotational speed. For ball bearings, life is proportional to the cube of the load ratio, so providing load margin greatly extends life.

  3. 3. Margin for static and shock loads

    The basic static load rating C0r is the allowable standard for permanent deformation generated at the rolling elements and raceways under stationary or low-speed conditions. For applications with oscillating motion or shock loads, confirm that a static safety factor against the maximum load is secured using C0r.

  4. 4. Operating speed and lubrication method

    The limiting speed differs by lubrication method, and separate values are given for grease lubrication and oil lubrication. Confirm that the normal operating speed does not exceed the limiting value, and in high-speed ranges also consider cage material and precision grade. The reference speed can also be consulted as a thermal guideline.

  5. 5. Precision grade and internal clearance

    Precision grades (P0, P6, P5, etc.) indicate rotational accuracy and dimensional accuracy; for high-precision applications such as machine tool spindles, select higher grades. Internal clearance (C2, CN, C3, etc.) is selected to allow for changes caused by interference fit and temperature differences during operation.

  6. 6. Materials and lubrication suited to the environment

    For corrosive, high-temperature, vacuum, or clean environments, select specifications such as rings and rolling elements made of stainless steel or ceramics, or solid lubricants and fluorine grease for vacuum use. Check the operating temperature range, low dust generation, and whether food-grade grease registration applies against the application conditions.

This guide was written by AI based on the listed products' documents and specification items.

About Rolling Bearings and all products

Description

Centered on full ceramic bearings and hybrid ceramic bearings with silicon nitride as the standard material, combined with special steel materials, various solid lubricants and fluorinated grease, to suit special environments such as semiconductor manufacturing equipment. Provides selection information for non-magnetic, insulating, high-speed rotation and corrosion-resistant applications.

Features

  • Low density and high rigidity from silicon nitride
  • Non-magnetic and insulating, preventing electrolytic corrosion
  • Clean and vacuum-compatible lubricants available for selection
  • Options of materials with excellent corrosion resistance

Applications

  • Semiconductor manufacturing equipment
  • Vacuum equipment
  • Clean environments
  • Corrosion-resistant applications
  • High-temperature environments
  • Non-magnetic applications
  • Insulating applications
  • High-speed rotating equipment

FAQ

Q. Which materials are used as standard in the full ceramic bearings of the EXSEV bearing series?
A. The series centers on full ceramic bearings and hybrid ceramic bearings with silicon nitride as the standard material, combined with special steel materials, various solid lubricants and fluorinated grease.
Q. What features and applications are suited to EXSEV silicon nitride products?
A. They offer low density and high rigidity from silicon nitride, non-magnetic and insulating properties that prevent electrolytic corrosion, and options of materials with excellent corrosion resistance. They are applicable to semiconductor manufacturing equipment, vacuum equipment, clean environments, corrosion-resistant applications, high-temperature environments, non-magnetic applications, insulating applications and high-speed rotating equipment.
Q. What are the density, hardness, heat resistance and modulus of elasticity of silicon nitride in EXSEV bearings?
A. Density is 3.2 g/cm3, Vickers hardness is 1500 HV, heat resistance (in air) is 800 ℃, and longitudinal modulus of elasticity is 320 GPa.
Q. Can lubricants be selected for EXSEV bearings when used in clean or vacuum environments?
A. Yes, clean and vacuum-compatible lubricants can be selected.

Written by AI based on the content of the source documents.

Source documents

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