For statically loaded self-aligning ball bearings, always inspect the static load safety factor S0 in addition to the nominal lifetime L (L10h).

The reference speed is calculated according to ISO 15312 and is the speed at which, under defined reference conditions, a bearing operating temperature of +70 °C is achieved. It is not a speed limit for the application of a bearing but provides the basis to compare the speed suitability of different bearing types.

As a hydraulic cylinder repair company, our team has been resealing hydraulic cylinders for over 30 years. We can help you no matter what your hydraulic system needs, and we are always happy to offer seal recommendations and answer any questions.

Leaking or damaged seals can seriously impact your hydraulic system's performance. Trust our experts to select the right seals for your application and perform quality resealing services.

Designed with a lip that scrapes the system's surface when it moves, they eliminate any particles that may have accumulated. Additionally, wiper seals provide an extra barrier against entering liquids and gases. They are commonly used in conjunction with other seals such as O-rings, and rod seals to provide a comprehensive sealing solution.

self-aligningroller bearing size chart

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SLF-self-aligning ball bearings with a maximum outer diameter up to 240 mm are standard stabilized in size (S0), meaning that they are subjected to heat treatment to make them usable up to a working temperature of 150 °C. At more than 240 mm outer diameter, the self-aligning ball bearings are standard stabilized in dimension (S1), meaning that they are subjected to heat treatment to make them usable up to a working temperature of 200 °C. However, as a rule, the maximum working temperature is not limited by the dimensional stability of the bearing rings and balls. Frequently the limitation is the cage, lubricant, or sealant. For the necessary detailed information, see the corresponding chapters. If you are uncertain or have specific questions regarding the maximal temperature our bearings withstand, don’t hesitate to contact the SLF team.

In self-aligning ball bearings, the main dimensions are standardized according to ISO 15 (Radial bearings – boundary dimensions), DIN 616 (Roller bearings – boundary dimensions) or DIN 630 (Radial self-aligning ball bearing – double row).

Mostly the radial load resulting from the weight of the components run on bearings combined with the external forces is higher alone than the minimal load required. Should this value not be met, contact an SLF application technician.

They also help maintain the pressure within the cylinder, allowing the piston to move efficiently. Piston seals are used in various applications, such as air compressors, hydraulic pumps, and internal combustion engines. As critical components in any reciprocating system, they ensure the efficient movement of the parts while keeping the system sealed and maintaining the pressure within.

Wiper seals keep dirt, debris, and other contaminants from entering a system or machine. They are typically used for applications such as hydraulic cylinders, pumps, and valves and can be made from various materials, including rubber, polyurethane, and thermoplastic elastomers.

The self-aligning ball bearings in the 112 and 113 series are made with a wide inner ring. Attachment is done using dowel pins that engage with the axial groove at one side of the inner ring. In these two bearing series, the bearing hole has a J7 tolerance.

Have a question about our pneumatic cylinder repairs? Contact Cylinders, Inc. to find out more about how our experts can help, or schedule your repair service today!

Hydraulic cylinder seals form a barrier between different components in a hydraulic cylinder. They are made with specific materials that adjust to varying clearance gap sizes and must be strong enough to withstand the shear stress created by system pressure.

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The difference between a rod seal vs. piston seal: Rod seals are flexible and keep pressure in and contaminants out, while piston seals are rigid seals that keep pressure in and lubricate in.

These rings are available in metallic and nonmetallic options. Factors such as the diameter of the rod and piston, the stroke length, pressure, type of seal, and lubrication must be considered when selecting guide rings.

For lifetime calculation, in the case of a combined load, insert an equivalent radial load. It is to be determined as follows:

In some large-sized self-aligning ball bearing types, the balls slightly protrude laterally; this feature must be considered when dimensioning the surrounding components.

The dimensions of the self-aligning ball bearings with wide inner ring are manufactured according to the standard DIN 630-2, withdrawn without replacement in 1993.

SLF offers self-aligning ball bearings with cylindrical and tapered holes in the 12, 22, 13 and 23 series. In bearings with a tapered hole, the taper ratio is 1:12.

When selecting hydraulics cylinders seals, it is essential to consider the type of surfaces they will be used on. A static seal should be employed if there is no relative motion between mating surfaces. On the other hand, if there is motion between surfaces (either reciprocating or oscillating), then a dynamic seal should be used.

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The correct  hydraulic cylinder seals, will maintain the integrity of the machine's system and extend its working life. Our hydraulic cylinder resealing services ensure such equipment runs at peak performance.

Hydraulic cylinder seals are an integral part of any hydraulic system because they control and maintain the pressure and movement of hydraulic fluid. Without them, hydraulic systems can't work correctly.

Hydraulic rod seals consist of a metal rod inserted in a rubber or plastic sealing element. The sealing part conforms to the rod surface, creating a tight seal that prevents internal pressure from escaping and external contaminants from entering the cylinder.

In addition, the buffer seal cushions the rod from shock and vibration, increasing the life of the cylinder and its components. Rod and buffer seals are suitable for mobile and industrial applications, such as agricultural and construction equipment, where they are exposed to dirt, dust, and moisture.

Different types of sealing are available for hydraulic cylinders, ranging from simple O-rings to complex rotary seals, hydraulic ram seals, and hydraulic oil seals. Depending on the application, the type of seal required will vary; but all seals serve the same purpose of creating a secure, fluid-tight seal.

Self aligning ball bearingssizes

SLF produces self-aligning ball bearings with standard tolerance (PN) according to DIN 620-2 (Roller bearing tolerances – tolerances for radial bearings) and ISO 492 (Radial bearings – dimensions and tolerances). Please specifically request different tolerance classes or special tolerances.

In this blog, we look at how hydraulic cylinder seals are designed to prevent leakage, the main types of seals, and the materials they are made of to withstand high pressure.

Self-aligningbearing types

To avoid slippage between elements in contact, the self-aligning ball bearings must be sufficiently loaded. A minimal radial load in the order of magnitude of

Having done thousands of repairs, we have extensive knowledge and experience to expertly service your repairs and perform preventative maintenance. We also have a large inventory of seals and stock common steel shapes if your repair requires fabrication. If you’re looking for experienced and professional hydraulic repair service, contact Cylinders, Inc. today!

Guide rings are mounted on pistons and piston rods of hydraulic cylinders to absorb side loads and prevent metal-to-metal contact between sliding parts, such as rod and gland/piston and bore. They are typically placed inward of both the rod and buffer seal and should be lubricated on assembly with the same lubricant used in the hydraulic system.

Sealed self-aligning ball bearings (bearings in the 22 … and 23 series) are equipped with contacting sealing on both sides (2RS). They are also standard filled with a high quality lithium-saponified roller bearing grease (bearings with D≤62mm) or a high-performance grease-EP-grease (bearings with D>62mm) based on an age-resistant mineral oil. It is possible to use these bearings at temperatures from -20 °C to max. 110 °C for short periods. When doing this, please note that the operational life of the grease is reduced at a constant temperature >70 °C. In cases like these we recommend special grease customized for the application.

Choosing suitable seal material is crucial, as it determines the overall quality and durability of hydraulic seals. Your manufacturer can suggest appropriate materials - whether you need hydraulic seal rings, o-rings, or any other type of seal -  to meet specific application needs. Below are the most common materials used to create seals:

Self-aligningroller bearing

With a wide variety of hydraulic seals available, it is essential to select wisely to ensure cost-effective hydraulic cylinder repairs. Doing so will help to guarantee a long operating life and improved performance over the lifetime of the hydraulic cylinder. Incorrectly sealing equipment can lead to premature wear and eventual failure.

Self-aligning ball bearings can be swiveled out of the center position by approx. 4°. In sealed bearings, the maximum angle is 1.5°.

Self-aligning ballbearing application

self-aligningbearing size chart

A hydraulic cylinder seal protects the hydraulic fluid and prevents the hydraulic system's components from mixing with external fluids. They also help to improve a system's overall efficiency and reliability, among other things:

Self-aligning ball bearings are double-row bearings with two raceways at the inner ring and a joint concave raceway in the outer ring. This design allows for swiveling at various angles, and the bearings of this type are not affected by a slant between shaft and housing. For this reason, they are well suited to arrangements of bearings in which major shaft deflections or misalignments are to be expected.

For standard, we deliver self-aligning ball bearings according to DIN 620-4 (Roller bearing tolerances – radial clearance) and ISO 5753-1 (Roller bearings – clearance – radial clearance) in the clearance class CN. We can also supply design types in other clearance classes upon request.

Self-aligning ball bearings can be designed with fiberglass reinforced polyamide 66 with the designation suffix TV, as well as with a solid brass cage (suffix M). We can also supply individual self-aligning ball bearing types with sheet metal cage (J) upon request. Self-aligning ball bearings with cages made of fiberglass reinforced polyamide 66 (TVP) are suitable for continuously increasing temperatures up to 120 °C. In case of oil lubrication, additives contained in the oil may reduce the operational life of the cage, if the temperature is greater than 100 °C over a longer period.

Piston seals, also known as piston rings, are mechanical seals that reduce leakage between components in a reciprocating motion. Therefore, the primary function of a hydraulic piston seal is to form a seal between the cylinder tube and piston, preventing the leakage of lubricants and gases.