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Single-Direction Thrust Cylindrical Roller Bearings 811 Series and 812 Series

811, 812 / SKF (Official website)

Single-row thrust cylindrical roller bearings for heavy axial loads and shock loads. Available in bore diameter range d 15 to 120 mm, with separable bearing components for mounting.

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Specifications

Inner diameter 15 to 120 mm
Basic dynamic load rating (representative example 81102TN) 11.2 kN
Basic static load rating (representative example 81102TN) 27 kN
Rated rotational speed (representative example 81102TN) 4300 r/min
Limiting speed (typical example 81102TN) 8500 r/min

How to choose Rolling Bearings

Points to check when selecting, with the values for this product (Single-Direction Thrust Cylindrical Roller Bearings 811 Series and 812 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

Used in applications where the load capacity of thrust ball bearings is insufficient. Roller raceway ends are crowned to reduce peak stress at roller ends. Radial loads must never be applied. Manufactured to normal tolerance. Cage is made of glass fiber reinforced PA66 resin or machined brass.

Features

  • Very high rigidity
  • Small axial space requirement
  • Shaft race, housing race, and caged rollers can be mounted separately
  • Crowned raceway surfaces that reduce peak stress at roller ends
  • Thermal stability up to 120 °C

Applications

  • Machine components subjected to heavy axial loads
  • Applications subjected to shock loads

FAQ

Q. What load conditions are the 811 Series and 812 Series thrust cylindrical roller bearings suited for?
A. These are single-row thrust cylindrical roller bearings suited for heavy axial loads and shock loads. They are used in applications where the load capacity of thrust ball bearings is insufficient. Radial loads must never be applied.
Q. What is the bore range of the 811 Series and 812 Series, and can the bearings be mounted separately?
A. The bore diameter is 15 to 120 mm, and the dimension range is d 15 to 120 mm. The shaft race, housing race, and caged rollers can be mounted separately.
Q. What cage materials are available for the 811 Series and 812 Series, and what is their thermal stability?
A. The cage is made of glass fiber reinforced PA66 resin or machined brass. Thermal stability is up to 120 °C.
Q. What are the rated load and speed ratings of representative model 81102TN?
A. Model 81102TN has a basic dynamic load rating of 11.2 kN, a basic static load rating of 27 kN, a rated speed of 4300 r/min, and a limiting speed of 8500 r/min.

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

Source documents

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