Alphabetic characters“A” in position 3 in combination with “A” in position 2denotes .187 x .187 series“A” in position 3 in combination with “H” in position 2denotes .187 x .250 series“A” in position 3 in combination with “S” in position 2denotes .187 x .312 series

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The seal is effective, but requires turning force (torque), generates heat, and therefore has a lower speed limit than open or shielded Reali-Slim bearings. Reali-Slim bearings can be integrally sealed or externally sealed. Lubricant and lubrication system, torque requirements, speed and operating environment will influence selection. Integral seals and guards provide a very compact overall design and have the added advantage of protecting the bearings before, during and after installation. EA/EB bearings are used where a guard is sufficient or where a guard is required due to torque or speed limitations. When weight and space are at a premium and a seal or guard is required on only one side, single-seal or single-shield bearings are available as custom options. NOTE: Sealed Reali-Slim bearings are pre-lubricated with general purpose grease. Operating conditions (i.e. time, temperature, speed, environment) may cause premature degradation of lubrication. A variety of lubricants are available to meet your specifications.

Dry film and surface treatments have been used as bearing lubricants in applications in extreme environments, especially where conventional lubricants cannot withstand or survive. Several types are available; options include tungsten disulfide, graphite, and molybdenum disulfide.

To realize the full potential of Reali-Slim bearings, Kaydon recommends that customers’ maintenance instructions and plans should take into account operating conditions and include procedures to ensure that the bearings are adequately protected against intrusion of all types of foreign matter, and that fresh oil or grease is introduced with sufficient frequency to Clean bearings and ensure adequate lubrication.

If the bearing will not be exposed to a polluted environment, you can consider choosing an open bearing. If the bearing needs to be kept clean and well lubricated, you can choose a sealed bearing. To support various load conditions, Kaydon Reali Slim bearings are available in three basic types, radial contact (Type C), angular contact (Type A) and four-point contact (Type KC, etc.) Kaydon Reali Slim bearings are available with a variety of cage options to evenly space rolling elements and prevent contact between them. Available cage types include continuous ring “sleeve cages”, continuous ring circular cages, Molded cage, ring cage, PTFE cage, etc.

Sealed bearings are equipped with an anti-corrosion oil coating to prevent corrosion during storage. Kaydon recommends using clean petroleum solvent to remove preservatives before lubrication. If the anti-corrosion oil is not removed, the compatibility of the lubricant with the anti-corrosion oil must be confirmed.

Examples040 = 4.0″ bore120 = 12.0″ bore400 = 40.0″ bore“10” following “AA” in positions 2 & 3 =.187 x .187 series with 1.0″ bore“15” following “HA” in positions 2 & 3 =.187 x .250 series with 1.5″ bore

It is important to note that the amount of lubricant affects bearing performance under specific operating conditions. If a film of oil is maintained on all contact surfaces, only relatively small amounts of lubricant are needed to reduce friction and wear. At higher speeds, excess oil or grease can lead to higher operating temperatures, which can lead to early bearing fatigue. Typical grease fill levels range from 10% to 30% of the bearing’s available free space, depending on the bearing design and application.

Gothic arch form for two 30° contact angles under light radial gaging load. Sufficient diametral clearance to provide clearance after installation with recommended fits.

Type X or C = diametral preload or clearanceDuplexed type A = axial preload or clearanceNote: Above internal bearing fits apply to unmounted bearings only.Mounting fits can greatly affect final internal bearing fit.

Diametral clearance for 30° contact angle in single unmounted bearing under light axial gaging load. Wide range of preload or running clearance for matched sets.

Listed shaft and housing diameters are for steel supports with standard bearing diametral clearance. Recommended shaft and housing diameters can change greatly based on orientation, temperature, speed, non-standard diametral clearances, and desired performance characteristics. Contact Kaydon for design assistance when required.

Lubricants in anti-friction bearings reduce friction and wear between moving parts, dissipate heat and prevent corrosion on critical surfaces. Kaydon recommends selecting the appropriate lubricant based on the system design engineer’s evaluation of operating conditions, including at a minimum: rotational speed, load type and size, and ambient temperature. The three commonly used lubricants are oil, grease and dry film or surface treatment.

Because grease is easily retained, the design of the bearing housing and seals is simplified. In many applications, the lubricant itself can act to exclude contaminants when used in conjunction with labyrinths or tight gaps between rotating and stationary structures. For higher speeds in the range suitable for grease lubrication, channel-type greases are usually chosen.

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In order to take full advantage of anti-friction bearings, it is important to keep them clean and well lubricated. Properly designed and installed seals and guards help achieve this.

* Diametral clearance after installation theoretically can range rather widely if all contributing bearing, housing, and shaft tolerances are at either of their extremes. Diametral clearances shown do not apply to Type A (angular contact) bearings.

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Kaydon Reali Slim thin section bearings are available in both inch and metric size standards. Inch size Kaydon Reali Slim thin section bearings are available in seven open series and five sealed series, with bore diameters ranging from 1 inch to 40 inches, and cross-sections ranging from 0.187×0 .187 inches to 1×1 inches. Kaydon thin section bearings can provide internal assembly, lubricants, cages and other features to meet the most demanding application requirements. If corrosion resistance is required, Kaydon stainless steel Reali Slim or Endura Slim series bearings are good options. The anti-corrosion performance of Endurakote-coated bearings is better than that of stainless steel bearings. Metric Kaydon also has several series, including Kaydon Reali Slim MM metric series bearings, Ultra Slim bearings, Reali Smim TT series turntable bearings, BB metric ball bearings, KT thin-section tapered bearings, etc.

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*Diametral clearance after installation theoretically can range rather widely if all contributing bearing, housing, and shaft tolerances are at either of their extremes.

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Listed shaft and housing diameters are for steel supports with standard bearing diametral clearance. Recommended shaft and housing diameters can change greatly based on orientation, temperature, speed, non-standard diametral clearances, and desired performance characteristics. Contact Kaydon for design assistance when required.

Ultra-thin Reali-Slim bearings bring additional advantages in application design. The ultra-thin Reali-Slim bearings with large bore diameter and small cross-section allow the use of large diameter hollow shafts instead of small diameter solid shaft, main column designs. Components such as air and hydraulic lines or electrical wires and slip rings can then be accommodated within the hollow shaft, resulting in a cleaner, efficient design. In many applications, a single four-point contact Reali-Slim bearing can replace two bearings, shrinking the design and simplifying bearing installation. In addition to the obvious cost savings of eliminating one bearing, this arrangement creates space and reduces weight. The use of Reali-Slim bearings also provides a stronger structure by using a large diameter hollow tube instead of a solid shaft and supporting the rotating structure (table) on the periphery.

All Reali-Slim® bearings requiring compliance with Defense Federal Acquisition Regulations (DFAR) “Specialty Metals” and “the Restrictions on Acquisition of Ball and Roller Bearings” clauses will contain ‘-USA’ in positions 10-13. If internal fit is not called out in position 9, it will also contain a dash.

Reali-Slim thin-section bearings are a shining pearl among industrial bearings and are world-famous for their space and weight savings. This blog will comprehensively introduce the specifications, sealing, tolerances, lubrication, code identification, and how to choose the appropriate bearing for Reali-Slim thin-section bearings, and provide you with constructive suggestions.

Seal: A contact closure between a stationary and rotating part that retains lubricant within the bearing and prevents foreign matter from entering the bearing. The seal is fixed in the outer ring and in close contact with the inner ring.

Oil generally provides complete lubrication. Due to its liquid state, it provides better coverage of key surfaces and helps dissipate heat easily, the latter especially when providing circulation and cooling. Oil is necessary in high-speed applications where the heating effect is pronounced. Oil usually provides lower friction values when minimum torque is required.

The specifications of Reali-Slim thin-section bearings are extremely important for the traceability of bearing products. Specification control charts provide users with the characteristics and parameters of a specific bearing, as well as the ability to generate unique numbers and other options for the bearing. This allows you to identify bearings quickly and easily. Each series of Reali-Slim bearings is based on a cross-section that remains constant as the bearing’s bore diameter increases. The constant cross-section of Reali-Slim bearings is of particular value when designing products that will be manufactured in various sizes depending on shaft diameter and power requirements. Kaydon Reali-Slim® bearings can be optimized for specific applications and custom manufactured with non-standard materials, dimensions, tolerances, properties, and custom packaging and lubrication options. Standard commercial options include diameter clearance variations, preload, lubricants, packaging, high-point etching, and .