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Wide-Type Cylindrical Roller Bearings (99, W99, SW99 Series)

99/W99/SW99 / JTEKT Corporation (Official website) / Listed on page 91 of the document

Wide-type cylindrical roller bearings with high radial load capacity, suited to heavy and impact loads. Available with and without flanges on the outer ring, with oil holes.

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Wide-Type Cylindrical Roller Bearings (99, W99, SW99 Series) on page 91 of JTEKT Corporation "JTEKT 大形転がり軸受カタログ（技術解説・軸受寸法表）"
Source: JTEKT Corporation「JTEKT 大形転がり軸受カタログ（技術解説・軸受寸法表）」page 91
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Specifications

Inner diameter d 50～200 mm
Outer diameter D 90～340 mm

How to choose Cylindrical Roller Bearings

Points to check when selecting, with the values for this product (Wide-Type Cylindrical Roller Bearings (99, W99, SW99 Series)).

  1. 1. Boundary dimensions that fit the shaft and housing

    This product: Inner diameter d 50～200 mm

    Select the bore diameter d to match the shaft diameter and the outside diameter D to match the housing bore, and determine the width B from the available installation space. Even with the same bore, there are dimension series with different outside diameters and widths, and wide-section types and types with thicker outer ring walls also exist. Confirm the boundary dimensions d×D×B combination against the bearing number.

  2. 2. Select a rated load that suits the load conditions

    The basic dynamic load rating Cr is the basis for life calculation; calculate whether the required life is met from the actual load and rotational speed. For large loads at standstill or low speed, or for shock loads, also check the basic static load rating C0r. Wide-section, double-row and full-complement types are options when greater load capacity is needed.

  3. 3. Determine the type for fixed and free positions

    NU and N types allow relative axial movement between the inner and outer rings, making them suitable for the free side that absorbs thermal expansion of the shaft. If axial load is applied, choose NJ or NF types for one direction, or NUP types for both directions. First determine which bearing in the overall bearing arrangement locates the shaft axially.

  4. 4. Select a clearance that suits fit and temperature

    Internal clearance is available in classes such as C2, CN and C3. Consider a larger clearance class where an interference fit or a temperature difference between inner and outer rings reduces the clearance during operation. Tapered bore double-row types allow clearance adjustment by the amount of push-in and are used in applications with strict clearance control, such as machine tool spindles.

  5. 5. Match rotational speed with cage and accuracy grade

    For high-speed rotation, check the permissible rotational speed as well as the cage material (brass, steel sheet or resin) and the accuracy class. Full-complement types without cage have high load capacity but are unsuitable for high speed. Hybrid types with silicon nitride rollers offer low friction and support high-speed rotation.

  6. 6. Check electrical erosion countermeasures and maintainability

    In inverter-driven motors and generators, current can flow through the bearing causing electrical erosion, so consider insulated-coated or ceramic-roller types. For outdoor use or locations that are difficult to lubricate, also check for sealed, grease-packed designs, rust-preventive treatment, and ease of disassembly and inspection.

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

About Cylindrical Roller Bearings and all products

Description

Outer rings are available with and without flanges, and all have two oil holes. Bearings with four oil holes are also available. Manufactured to tolerances conforming to JIS B 1514 Class 0 or Class 6.

Features

  • High radial load capacity
  • Oil holes provided in the outer ring

Applications

  • Rolling mills
  • Machinery subject to heavy and impact loads

FAQ

Q. What are the bore and outside diameter ranges for the wide-type cylindrical roller bearings (99, W99, SW99 Series)?
A. Bore diameter d ranges from 50 to 200 mm, and outside diameter D ranges from 90 to 340 mm.
Q. Are the wide-type cylindrical roller bearings (99, W99, SW99 Series) available with and without outer ring flanges?
A. Outer rings are available with and without flanges.
Q. What is the oil hole configuration of the wide-type cylindrical roller bearings (99, W99, SW99 Series)?
A. All have two oil holes. Bearings with four oil holes are also available.
Q. What applications are the wide-type cylindrical roller bearings (99, W99, SW99 Series) suited for?
A. They have high radial load capacity and are suited to heavy and impact loads. They are used in rolling mills and in machinery subject to heavy and impact loads.
Q. Which standard do the tolerances of the wide-type cylindrical roller bearings (99, W99, SW99 Series) conform to?
A. They are manufactured to tolerances conforming to JIS B 1514 Class 0 or Class 6.

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

Source documents

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