Seals for rolling bearings

Seals for rolling bearings are critical components that serve to prevent the ingress of contaminants such as dust, dirt, moisture and other foreign bodies into the bearing. They play an important role in extending the service life of rolling bearings and maintaining their performance.

Rolling bearings that run in oil are often used without seals. Bearings that are sealed have additional prefixes or suffixes. Each manufacturer uses different designations for their seals, so it is worth taking a look at our conversion list.

Different seals are required for different rolling bearings, applications and designs.

Here are the best-known types of seals for standard applications:

1. Rubber seals (radial seals): Also known colloquially as plastic seals or splash seals, this type of seal is typically made of rubber often NBR or another elastic material and is fitted along the circumferential surface of the rolling bearing. They provide an effective barrier against the ingress of dirt and moisture and are often used in applications that are not exposed to extreme conditions.
2. Metallic gaskets: Metallic gaskets, also known as cover gaskets or dust protection gaskets, are usually made of steel or stainless steel and offer a robust sealing solution. They are often used in applications that are exposed to high temperatures, high pressures or aggressive environments.
3. Combined seals: Combined seals unite the advantages of rubber and metal seals, for example by combining a rubber seal with a metal protective ring. This type of seal offers improved performance and reliability in demanding applications.

Selection criteria:

When selecting a suitable seal for a rolling bearing, various factors must be taken into account, including

• Operating environment (temperature, humidity, contamination level)
• Application requirements (speed, load, lubricant)
• Service life expectancy and ease of maintenance
• Costs and availability

Maintenance and replacement:

Although seals help to extend the service life of rolling bearings, not all rolling bearings with seals are maintenance-free. Deep groove ball bearings are often referred to as maintenance-free, as the grease filling is sufficient for the service life of the bearing.

Other bearings, such as housing bearings, still require regular maintenance to maintain their effectiveness. Careful inspection and maintenance in accordance with the manufacturer's guidelines are essential to ensure optimum performance of the seals and the entire bearing system.

Seals for rolling bearings are essential components that help to improve the performance and service life of rolling bearings by protecting them from harmful environmental influences. The selection of the right seal and proper maintenance are crucial to ensure reliable operation.

All information is provided without guarantee and is for general information purposes only.

Continue to:

• Heating device
• Axial bearing
• Arrangement of rolling bearings
• Flaking of rolling bearings
• Storage of rolling bearings