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Angular Contact Ball Bearing 3NCHAR / HAR / 3NCHAC / 3NCHAD Series (7000, 7900, 7200 Series)

7000系・7900系・7200系 / JTEKT Corporation (Official website) / Listed on page 66 of the document

High-speed, high-precision angular contact ball bearing series with bore diameters of 75 to 190 mm, offering a wide range of models with different contact angles and mounting arrangements.

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Angular Contact Ball Bearing 3NCHAR / HAR / 3NCHAC / 3NCHAD Series (7000, 7900, 7200 Series) on page 66 of JTEKT Corporation "精密転がり軸受 Precision Ball & Roller Bearings (CAT.NO.BA005JA-5DS)"
Source: JTEKT Corporation「精密転がり軸受 Precision Ball & Roller Bearings (CAT.NO.BA005JA-5DS)」page 66
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Specifications

Inner diameter d 75～190 mm
Outer diameter D 115～260 mm
Width B 20～42 mm
Contact Angle α 15～30 °
Permissible speed (e.g. 7000 series equivalent to 7015 series) 5100～21000 min-1

How to choose Rolling Bearings

Points to check when selecting, with the values for this product (Angular Contact Ball Bearing 3NCHAR / HAR / 3NCHAC / 3NCHAD Series (7000, 7900, 7200 Series)).

  1. 1. Bore and housing bore dimensions

    This product: Inner diameter d 75～190 mm

    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

Models are selected by nominal contact angle of 15°, 20°, 25° or 30°, and are available in single-row, back-to-back, face-to-face and multi-row arrangements. Basic load ratings, permissible rotational speeds, preload loads, axial stiffness and other values are listed by dimension. Spacer dimensions for oil-air lubrication are also provided separately.

Features

  • Selectable contact angle from 15° to 30°
  • Supports back-to-back, face-to-face and multi-row arrangements
  • Preload loads and axial stiffness listed by preload level (S, L, M, H)

Applications

  • Machine tool spindles
  • High-speed rotating components

FAQ

Q. What are the bore diameter, outside diameter and width ranges for the 3NCHAR / HAR / 3NCHAC / 3NCHAD Series (7000, 7900, 7200 Series)?
A. Bore diameter d is 75 to 190 mm, outside diameter D is 115 to 260 mm, and width B is 20 to 42 mm.
Q. How is the contact angle selected for the 3NCHAR / HAR / 3NCHAC / 3NCHAD Series?
A. Select from nominal contact angles of 15°, 20°, 25° or 30° depending on the model. The contact angle range is 15 to 30°.
Q. What mounting arrangements does the 3NCHAR / HAR / 3NCHAC / 3NCHAD Series support?
A. It supports single-row, back-to-back, face-to-face and multi-row arrangements.
Q. Where can the preload loads and axial stiffness of the 3NCHAR / HAR / 3NCHAC / 3NCHAD Series be checked?
A. Preload loads and axial stiffness by preload level (S, L, M, H) are listed. Basic load ratings, permissible rotational speeds, preload loads and axial stiffness are provided by dimension.
Q. What applications is the 3NCHAR / HAR / 3NCHAC / 3NCHAD Series suited for?
A. It is a high-speed, high-precision angular contact ball bearing intended for machine tool spindles and high-speed rotating components.

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

Source documents

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