High-Temperature Ball Bearing Unit, Diamond-Shaped Flange Housing, Metric Series (VA201/VA228)

Specifications

FYTB TF / YAR 204-211-2F model comparison

Compare 2 models in the same series by specification.

How to choose Bearing units

Points to check when selecting, with the values for this product (High-Temperature Ball Bearing Unit, Diamond-Shaped Flange Housing, Metric Series (VA201/VA228)).

1. 1. Match shaft diameter and dimensional system (metric/inch)

   This product: Shaft diameter d 20 to 55 mm

   Bearing units are offered in separate metric and inch series, and they are not interchangeable even when their appearance is similar. Listed products cover metric sizes of 3 to 150 mm and inch sizes of 1 to 4 in. First determine the shaft diameter and dimensional system, then select from the corresponding series.

2. 2. Check the rated load against the operating conditions

   The basic dynamic load rating Cr is used for rolling fatigue life calculations, and the basic static load rating C0r is used for evaluating stationary or shock loads. Listed Cr values range from 7.28 to 793 kN, and there are heavy-load products, such as half-ring types, with increased static load ratings.

3. 3. Select a specification suited to the operating temperature

   This product: Limit temperature 130 °C

   Standard greases and rubber seals deteriorate at high temperatures. High-temperature specifications are available in types with different upper temperature limits; for example, VA201 is rated at 130 to 250°C and VA228 at 260 to 350°C. In addition to the ambient temperature, check the permissible seal temperature and the sealed grease.

4. 4. Choose the shaft fixing method for the application

   Set-screw type is easy to install but requires control of the tightening torque. The method that fixes the bearing with a tapered bore and adapter sleeve provides a secure connection to the shaft and suits applications with reversing rotation or vibration. Check it together with the recommended shaft tolerance grade.

5. 5. Verify the permissible rotational speed

   This product: Permissible rotational speed 480 r/min

   Bearing units have an upper limit on usable rotational speed depending on seal friction and the fixing method. The permissible speeds of listed products range widely from 6 to 12000 r/min, and low-speed heavy-load and high-speed units have very different characteristics. Confirm that the operating speed has sufficient margin.

6. 6. Allow for shaft tilt during installation

   In the spherical-fit design, the unit can absorb shaft tilt during installation up to a certain angle. However, in structures that allow regreasing, the permissible angle may be smaller. Listed products include an example of 2°. Check the permissible misalignment according to the accuracy of the base or frame.

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

About Bearing units and all products

Description

Diamond-shaped flange housing ball bearing unit for shaft diameters of 20 to 55 mm. The VA201 specification has a maximum operating temperature of approx. 130°C; the VA228 specification can be used at approx. 260°C or higher. The VA201 requires a break-in run.

FAQ

Q. What is the difference in operating temperature between the VA201 and VA228 specifications of FYTB TF / YAR 204-211-2F?

A. The VA201 specification has a maximum operating temperature of approx. 130°C, and the VA228 specification can be used at approx. 260°C or higher.

Q. What shaft diameters and re-greasing requirements apply to the High-Temperature Ball Bearing Unit, Diamond-Shaped Flange Housing, Metric Series (VA201/VA228)?

A. Shaft diameters range from 20 to 55 mm. Re-greasing is not required.

Q. Is any work required before using the VA201 specification?

A. The VA201 specification requires a break-in run.

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

Source documents

• Catalog SKF高温用軸受 最高運転温度350 °C(660 °F) 40 pages Open page 34
  Found on: https://azuma-eg.com/catalogue/