This document gives supplementary background information regarding the derivation of factors given in ISO 20015.

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ISO 15312:2018 defines the thermal speed rating for oil bath lubricated rolling bearings and defines calculation principles for the determination of this parameter. The parameter determined in accordance with this document applies to rolling bearings of the given series and sizes of standard design or of a design that, from a frictional point of view, can be related to a standard design bearing. In most cases of standard assembly, the permissible temperature determines the maximum operating spee...view more

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ISO 20056-1:2017 specifies methods of calculating the dynamic load ratings for hybrid bearings with bearing rings made of contemporary, commonly used, high quality hardened bearing steel, in accordance with good manufacturing practice and rolling elements made from silicon nitride in contemporary, commonly used, high material and manufacturing quality and surface finish. For balls, ISO 26602[6] together with ISO 3290‑2[2] are applicable. For rollers, ISO 12297‑2[3] is applicable and ISO 26602[6]...view more

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ISO 20056-2:2017 specifies methods of calculating the static load ratings for hybrid bearings with bearing rings made of contemporary, commonly used, high quality hardened bearing steel, in accordance with good manufacturing practice, and a full set of rolling elements made of silicon nitride (Si3N4) in contemporary, commonly used material and manufacturing quality. For balls, ISO 26602,[4] together with ISO 3290‑2,[1] is applicable. For rollers, ISO 12297‑2[2] is applicable, and ISO 26602[4] is...view more

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ISO 20015:2017 specifies methods of calculating the static load rating and the dynamic load rating for spherical plain bearings within the size ranges shown in ISO 12240-1, ISO 12240-2 and ISO 12240-3. Rod ends according to ISO 12240-4 are excluded.

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ISO 14728-1:2017 specifies methods of calculating the basic dynamic load rating and basic rating life for linear motion rolling bearings manufactured from contemporary, commonly used, high quality, hardened bearing steel in accordance with good manufacturing practice and basically of conventional design as regards the shape of the rolling contact surfaces. The life of linear motion rolling bearings is defined and the conditions are established for reliable life calculations. ISO 14728-1:2017 is ...view more

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ISO 14728-2:2017 specifies methods of calculating the basic static load rating, static equivalent load and static safety factor for linear motion rolling bearings manufactured from contemporary, commonly used, high quality, hardened bearing steel in accordance with good manufacturing practice and basically of conventional design with regard to the shape of the rolling contact surfaces. ISO 14728-2:2017 is not applicable to designs where the rolling elements operate directly on the slide surface ...view more

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This Technical Specification contains recommendations for the calculation of the modified reference rating life taking into consideration lubrication, contamination and fatigue load limit of the bearing material, as well as tilting or misalignment, operating clearance of the bearing and internal load distribution on rolling elements. The calculation method provided in this Technical Specification covers influencing parameters additional to those described in ISO 281. The directions and limitatio...view more

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ISO/TR 1281-1:2008 gives supplementary background information regarding the derivation of mathematical expressions and factors given in ISO 281:2007.

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ISO 281:2007 introduced a life modification factor, aISO, based on a systems approach to life calculation, in addition to the life modification factor, a1.These factors are applied in the modified rating life equation, Lnm = a1aISOL10. The modification factor for reliability, a1, for a range of reliability values, is given in ISO 281:2007 as well as the method for evaluating the modification factor for systems approach, aISO. L10 is the basic rating life. ISO/TR 1281-2:2008 gives supplementary b...view more

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ISO/TS 16281:2008 contains recommendations for the calculation of the modified reference rating life taking into consideration lubrication, contamination and fatigue load limit of the bearing material, as well as tilting or misalignment, operating clearance of the bearing and internal load distribution on rolling elements. The calculation method provided in ISO/TS 16281:2008 covers influencing parameters additional to those described in ISO 281. The directions and limitations given in ISO 281 ap...view more

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ISO 281:2007 specifies methods of calculating the basic dynamic load rating of rolling bearings within the size ranges shown in the relevant ISO publications, manufactured from contemporary, commonly used, high quality hardened bearing steel, in accordance with good manufacturing practice and basically of conventional design as regards the shape of rolling contact surfaces. ISO 281:2007 also specifies methods of calculating the basic rating life, which is the life associated with 90 % reliabilit...view more

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ISO 76:2006 specifies methods of calculating the basic static load rating and the static equivalent load for rolling bearings within the size ranges shown in the relevant ISO standards, manufactured from contemporary, commonly used, high quality, hardened bearing steel in accordance with good manufacturing practice and basically of conventional design as regards the shape of the rolling contact surfaces. Calculations carried out in accordance with ISO 76:2006 do not yield satisfactory results fo...view more

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ISO 14728-2:2004 specifies methods of calculating the basic static load rating, static equivalent load and static safety factor for linear motion rolling bearings manufactured from contemporary, commonly used, high quality, hardened bearing steel in accordance with good manufacturing practice and basically of conventional design as regards the shape of the rolling contact surfaces. ISO 14728-2:2004 is not applicable to designs where the rolling elements operate directly on the slide surface of t...view more

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ISO 14728-1:2004 specifies methods of calculating the basic dynamic load rating and basic rating life for linear motion rolling bearings manufactured from contemporary, commonly used, high quality, hardened bearing steel in accordance with good manufacturing practice and basically of conventional design as regards the shape of the rolling contact surfaces. The life of linear motion rolling bearings is defined and the conditions are established for reliable life calculations. ISO 14728-1:2004 is ...view more

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ISO 15312:2003 defines the thermal speed rating for oil bath lubricated rolling bearings and defines calculation principles for the determination of this parameter. The parameter determined in accordance with this International Standard applies to rolling bearings of the given series and sizes of standard design or of a design that, from a frictional point of view, can be related to a standard design bearing. Thrust ball bearings are excluded from ISO 15312:2003 as kinematic effects do not allow...view more

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Specifies methods of calculating the basic dynamic load rating of rolling bearings, manufactured from hardened steel, as well as the basic rating life and the adjusted rating life. Does not apply to designs where the rolling elements operate directly on a shaft or housing surface.

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This second edition cancels and replaces the first edition (ISO 76 : 1978), of which it constitutes a technical revision. Specifies methods of calculating. Does not apply to designs where the rolling elements operate directly on a shaft or housing surface.

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Gives supplementary background information regarding the derivation of formulae and factors given in ISO 282/1.

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