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.

To avoid slippage between the contact partners, the angular contact ball bearings must be sufficiently loaded. A radial minimum load in the order of magnitude of

NSK Spherical Roller bearing pdf

The TOT arrangement is employed for high radial loads and at high axial loads in both directions as a fixed bearing. With this arrangement, very high stiffness is achieved. It is reasonable to install a maximum of three bearings side by side; otherwise, dissipation of heat and lubricant supply to all bearings would become worse or more difficult. To avoid this, spacers should be used here. It is possible to feed the lubricant easily through radial holes in the outer spacer. All arrangements can be delivered as a set upon request.

Tapered rollerbearings

O and X arrangements are applied to carry axial loads in both directions or to carry high radial loads. In the O arrangement, the large faces of the outer rings are adjacent, whereas, in the X arrangement, the small-sized faces of the outer rings are adjacent. The O arrangement is a very stiff mounting, has greater support distance H than the X arrangement, and, as a result, higher tilting resistance.

Angular contact ball bearings are standard manufactured without seals; consequently, the bearing location has to be sealed around/on the surrounding components. The sealing must ensure that no moisture and contaminants enter the bearing, and that no lubricant is lost. Angular contact ball bearings without seals are delivered ungreased, but must be lubricated with oil or grease. Choose lubricant according to the application.

To configure the following bearing arrangements, only bearings with universal design in the identical preload and tolerance class are permitted.

Nsk pdf

Super precisionbearings

For statically loaded angular contact ball bearings, one must check not only nominal lifetime L (L10h) , but also the static load safety factor S0.

Axial clearance or zero-backlash do not apply to mounted/ installed and unloaded bearing pairs. In tight fits, axial clearance is diminished or preload of the bearing pair is increased.

The TO and TX arrangements are, like the tandem arrangement, applied to carry high axial loads in one direction. The additional third bearing is used as a counterstay and makes the multiple arrangement a fixed bearing.

Angular contact ball bearings can also be delivered with ceramic balls or ceramic coating to insulate against electric current passage up to 1000 V. SLF’s angular contact ball bearings are also delivered as ”LONGLIFE“ bearings upon request. Bearings of this design type have a higher fatigue limit than the standard bearing. Both bearing and packaging are marked “LONGLIFE“.

Bearing Company

All ISO publications and materials are protected by copyright and are subject to the user’s acceptance of ISO’s conditions of copyright. Any use, including reproduction requires our written permission. All copyright requests should be addressed to copyright@iso.org.

ISO 19993:2007 specifies methods of evaluating the effectiveness of glued, laminated timber-face and edge bonds within a manufacturing plant by cleaving of the glue line in both dry and wet conditions.

For angular contact ball bearings with universal design, it is possible to use spacers for all arrangements. When manufacturing the spacers, ensure that the inner and outer ring have exactly the equal width and are parallel-sided. When desired by the customer, angular contact ball bearings can also be delivered as bearing pairs with spacers, ready to install, in tandem, O or X arrangement.

In single row angular contact ball bearings, the main dimensions are standardized according to ISO 15 (Radial bearings – boundary dimensions, DIN 616 (Roller bearings – boundary dimensions) or DIN 628-1 (Radial-angular contact ball bearings).

Back to back vs face to face bearing

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ISO 19993:2007 specifies methods of evaluating the effectiveness of glued, laminated timber-face and edge bonds within a manufacturing plant by cleaving of the glue line in both dry and wet conditions.

The SLF standard portfolio comprises the 718, 719, 70, 72 and 73 series. Other series are manufactured upon request. In angular contact ball bearings with designation suffix B, the contact angle α is 40°, and in bearings without suffix, it is 20° or 30° depending on the series. Here, α is understood as the angle encompassed by the connecting line of the two points of contact between ball and raceways with the radial plane, and under which the load is transferred from one raceway to the other.

As the default, we manufacture single row angular contact ball bearings with standard tolerances (PN) according to DIN 620-2 (Roller bearing tolerances – tolerances for radial bearings) and ISO 492 (Radial bearings – dimensions and tolerances). Different tolerance classes or special tolerances can also be delivered upon request.

Tandem arrangements, composed of two or three bearings, are used to carry high axial loads in one direction. Thus, high rigidity of the shaft mounting is reached. In tandem arrangements, each bearing carries an equal share of the axial load.

Cylindrical rollerbearings

Single row angular contact ball bearings have raceways that are offset in the bearing axis direction in the inner and outer ring and carry axial forces in only one direction. In case of a radial load, an axial force emerges in the bearing, and this force must be compensated by a counterforce. Angular contact ball bearings are not used as single bearings, because they carry emerging forces together. Consequently, these bearings are always arranged in pairs or as a bearing set based on mutual matching.

SLF-angular contact ball bearings up to 240 mm outer diameter are standard stabilized in dimensions by S0, meaning that they are heat treated to make them usable up to a working temperature of 150 °C. At greater than 240 mm outer diameter, the angular contact ball bearings are standard stabilized in dimensions by S1, meaning that they are heat treated to make them usable up to a working temperature of 200 °C. However, as a rule, the maximum operating temperature is not limited by the dimensional stability of the bearing rings and balls. In many cases, it is limited by cage, seals or lubricant. Please find the relevant information in the corresponding chapters. If you feel uncertain or have specific questions regarding the temperature limits of our bearings, the SLF team is ready to support you.

In most cases, the radial load resulting from the weight of the components run on the bearing and the external forces alone is higher than the required minimal load. If the achieved value remains below the minimum, please contact an SLF application technician.

Single row angular contact ball bearings with universal design are intended for installation in pairs in X, O or tandem arrangement. In universal design, the raceways and lateral faces of the bearing’s inner and outer rings are matched so that arbitrary bearings of the same size and preload /clearance can immediately be mounted in the corresponding arrangements. We distinguish the following universal design types:

In single row angular contact ball bearings, the cage made of fiberglass-reinforced polyamide 66 is standard in the hole diameter range up to approx. 130 mm. For the use of the cage made of fiberglass-reinforced polyamide 66, the operating temperate is limited to 120 °C, and the same limitations as for the deep groove ball bearings are applicable. Cages made of brass (standard, if not using the cage made of fiberglass-reinforced polyamide 66), steel sheet or brass sheet can be delivered upon request.