21.100.20 - Rolling bearings
ICS 21.100.20 Details
Rolling bearings
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ISO 12090-2:2011 establishes the boundary dimensions and tolerances for series 4 and 5 of linear motion rolling bearings, profiled rail guides.
These bearings consist of profiled rails with carriages, which can support forces from all perpendicular directions and moments around all axes and consist of recirculating rolling elements. The internal design of these profiled rail guides is at the discretion of the manufacturer. An assembly can comprise one or more carriages on a linear profiled rail.
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This document specifies the technical delivery requirements for five groups of wrought ball and roller
bearing steels as listed in Table 3, namely
— through-hardening bearing steels (steels with about 1 % C and 1 % to 2 % Cr),
— case-hardening bearing steels,
— induction-hardening bearing steels (unalloyed and alloyed),
— stainless bearing steels, and
— high-temperature bearing steels.
This document is applicable to the products and heat-treatment conditions given in Table 1 and the
surface conditions given in Table 2.
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This document specifies the technical delivery requirements for five groups of wrought ball and roller bearing steels as listed in Table 3, namely
— through-hardening bearing steels (steels with about 1 % C and 1 % to 2 % Cr),
— case-hardening bearing steels,
— induction-hardening bearing steels (unalloyed and alloyed),
— stainless bearing steels, and
— high-temperature bearing steels.
This document is applicable to the products and heat-treatment conditions given in Table 1 and the surface conditions given in Table 2.
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This document specifies the technical delivery requirements for five groups of wrought ball and roller bearing steels as listed in Table 3, namely — through-hardening bearing steels (steels with about 1 % C and 1 % to 2 % Cr), — case-hardening bearing steels, — induction-hardening bearing steels (unalloyed and alloyed), — stainless bearing steels, and — high-temperature bearing steels. This document is applicable to the products and heat-treatment conditions given in Table 1 and the surface conditions given in Table 2.
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This document specifies dimensional and geometrical characteristics, deviation limits from nominal sizes, and tolerance values to define the interface (except chamfers) of radial rolling bearings. Nominal boundary dimensions are defined in ISO 15, ISO 355[2] and ISO 8443[4]. This document does not apply to certain radial bearings of particular types (e.g. needle roller bearings) or for particular fields of application (e.g. airframe bearings). Tolerances for such bearings are given in the relevant International Standards. Chamfer dimension limits are given in ISO 582[3].
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This document specifies dimensional characteristics, deviation limits from nominal values, and tolerance values to define the interface (except chamfers) of thrust rolling bearings. Nominal boundary dimensions are defined in ISO 104[1]. This document is not applicable to certain thrust bearings (e.g. thrust needle roller bearings) or for particular fields of application (e.g. special thrust precision bearings). Tolerances for such bearings are given in the relevant International Standards. Chamfer dimension limits are given in ISO 582[3].
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This document specifies the boundary dimensions, other relevant dimensions and the corresponding tolerances of accessories for sleeve type linear ball bearings which are specified in ISO 10285.
This document applies to:
— the following housings:
— closed and adjustable flangeless housings for series 5 sleeve type linear ball bearings,
— open and open adjustable flangeless housings for series 5 sleeve type linear ball bearings;
— standard height shaft support rails for series 5 sleeve type linear ball bearings;
— flanged shaft support blocks for series 5 sleeve type linear ball bearings;
— solid and tubular shafts for series 5 sleeve type linear ball bearings.
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This document specifies the boundary dimensions for radial needle roller and cage assemblies.
In addition, this document gives the tolerances for the cage width and method of functional gauging of bore diameter of needle roller complement.
Informative values for the tolerances of shaft raceway, housing raceway and raceway widths are given in Annex A.
Functional gauging of radial needle roller and cage assembly is given in Annex B.
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This document specifies the boundary dimensions and normal class tolerance values for needle roller bearings with machined rings.
This document specifies dimensional and geometrical characteristics, and limit deviations from nominal sizes.
These specifications apply to complete needle roller bearings and to bearings without inner ring.
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This document defines terms applied in the field of rolling bearings and their technology.
This document includes terms related to all types of rolling bearings wherein the principal degree of freedom is continuous rotation around an axis enabled by an ordered set of rolling elements between two circular raceways such that loads can be transmitted between them in a particular range of either radial or axial directions, or both. This document also includes accessories to these products.
The following types of terms are not included:
— terms specified in ISO 76, ISO 281 and ISO 1132-1;
— terms which are narrowly applied in only one specialized rolling bearing International Standard.
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This document specifies flange dimensions of single-row radial ball bearings with flanged outer ring and single-row angular contact ball bearings with flanged outer ring. All other boundary dimensions for complete bearings are given in ISO 15.
Tolerances for the flanges are given in ISO 492.
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This document defines terms applied in the field of rolling bearings and their technology. This document includes terms related to all types of rolling bearings wherein the principal degree of freedom is continuous rotation around an axis enabled by an ordered set of rolling elements between two circular raceways such that loads can be transmitted between them in a particular range of either radial or axial directions, or both. This document also includes accessories to these products. The following types of terms are not included: — terms specified in ISO 76, ISO 281 and ISO 1132-1; — terms which are narrowly applied in only one specialized rolling bearing International Standard.
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This document specifies the boundary dimensions and normal class tolerance values for needle roller bearings with machined rings. This document specifies dimensional and geometrical characteristics, and limit deviations from nominal sizes. These specifications apply to complete needle roller bearings and to bearings without inner ring.
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This document specifies the boundary dimensions and preferred dimensions to be used for drawn cup needle roller bearings without inner ring as well as the minimum chamfer dimension limits. This document also specifies the closed end thickness dimensions for bearings with one closed end. In addition, this document specifies dimensional tolerances for the needle roller complement bore diameter and tolerances for the drawn cup width.
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This European Standard specifies the quality parameters of axlebox rolling bearings supporting the load of the vehicle, required for reliable operation of trains on European networks. It covers metallurgical and material properties as well as geometric and dimensional characteristics. It also defines methods for quality assurance and conditions for approval of the products.
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This European Standard specifies the quality parameters of axlebox rolling bearings supporting the load of the vehicle, required for reliable operation of trains on European networks. It covers metallurgical and material properties as well as geometric and dimensional characteristics. It also defines methods for quality assurance and conditions for approval of the products.
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This document establishes the means to achieve an electronic representation of rolling bearing data by providing a reference dictionary needed to describe various data about rolling bearings together with their descriptive properties and domains of values in various International Standards relevant to rolling bearings. This document is intended to facilitate the use, manipulation and exchange of rolling bearing data, for example, manufacturing, distribution and usage. This document specifies a reference dictionary that contains: — a definition of a general class of bearings intended to be further extended by reference dictionaries specifying bearings in other International Standards; — definitions and identifications of the classes of rolling bearings as they are described in the various International Standards relevant to rolling bearings, with associated classification scheme; — definitions and identifications of data element types that represent properties of rolling bearings; — definitions and identifications of domains of values that prove useful for describing the above-mentioned data element types. Each class, property or domain of values of this application domain constitutes an entry of the reference dictionary defined in this document. It is associated with a computer-sensible and a human-readable definition, and with a computer-sensible identification. Identification of a dictionary entry allows for unambiguous reference from any application. Definitions and identifications of dictionary entries are defined by means of standard data, which consist of instances of the EXPRESS entity data types defined in the common dictionary schema and in their extensions defined in ISO 13584-25. Identification dictionary is given in Annex A. The following are within the scope of this document: — standard data that represent the classes of rolling bearings; — standard data that represent the properties of rolling bearings; — standard data that represent domains of values used for properties of rolling bearings. The following are outside of the scope of this document: — methodology for structuring parts families used for specifying standard data defined in this document; — an implementation method by which the standard data defined in this document can be exchanged. NOTE 1 The structure of the physical file used for exchanging the standard data defined in this document is specified in ISO 10303‑21. NOTE 2 The physical file used for exchanging the standard data is compliant with ISO 13584-42:2010. NOTE 3 It is intended to provide an OntoML-based (XML) representation of the standard data when ISO 13584-32 (OntoML) is published. This document does not establish the reference dictionaries for linear motion rolling bearings and spherical plain bearings.
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This document specifies flange dimensions of single-row radial ball bearings with flanged outer ring and single-row angular contact ball bearings with flanged outer ring. All other boundary dimensions for complete bearings are given in ISO 15. Tolerances for the flanges are given in ISO 492.
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This document specifies the boundary dimensions for radial needle roller and cage assemblies. In addition, this document gives the tolerances for the cage width and method of functional gauging of bore diameter of needle roller complement. Informative values for the tolerances of shaft raceway, housing raceway and raceway widths are given in Annex A. Functional gauging of radial needle roller and cage assembly is given in Annex B.
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This document specifies supplementary background information regarding the derivation of formulae and factors given in ISOÂ 76:2006.
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This document specifies dimensions and tolerances of retaining slots to be used for outer rings of single-row angular contact ball bearings, four-point-contact ball bearings and radial cylindrical roller bearings.
The retaining slots are not suitable for use in the outer rings of sealed and shielded radial ball bearings, nor in the outer rings of radial cylindrical roller bearings without ribs.
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This document specifies supplementary background information regarding the derivation of formulae and factors given in ISO 76:2006.
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This document specifies nominal boundary dimensions, geometrical product specifications (GPS) and tolerance values for finished steel cylindrical rollers for rolling bearings. The maximum roller diameter is 40 mm. Annexes A and B give the sorting principles for roller diameter and roller length tolerances and gauges, respectively.
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This document specifies dimensions and tolerances of retaining slots to be used for outer rings of single-row angular contact ball bearings, four-point-contact ball bearings and radial cylindrical roller bearings. The retaining slots are not suitable for use in the outer rings of sealed and shielded radial ball bearings, nor in the outer rings of radial cylindrical roller bearings without ribs.
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This document specifies the boundary dimensions and tolerances for thrust needle roller and cage assemblies. Furthermore, it recommends dimensions and tolerances for thrust washers, i.e. raceway members, which can be used either as shaft or housing washers.
Annex A gives general characteristics for application of thrust needle roller and cage assemblies and thrust washers.
Gauging method for thrust needle roller and cage assemblies and thrust washers is given in Annex B.
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This document specifies the boundary dimensions and tolerances for thrust needle roller and cage assemblies. Furthermore, it recommends dimensions and tolerances for thrust washers, i.e. raceway members, which can be used either as shaft or housing washers. Annex A gives general characteristics for application of thrust needle roller and cage assemblies and thrust washers. Gauging method for thrust needle roller and cage assemblies and thrust washers is given in Annex B.
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This document specifies supplementary background information regarding the derivation of mathematical expressions and factors given in ISO 281:2007.
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This document specifies the dimensional and geometrical characteristics, boundary dimensions and tolerances of insert bearings and eccentric locking collars and the radial internal clearances of insert bearings.
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This document specifies vibration measuring methods for double-row radial spherical roller bearings
and single-row and double-row radial tapered roller bearings, with cylindrical bore and outside surface
and a contact angle up to and including 45°, under established measuring conditions.
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This document specifies bearing and subunit boundary dimensions for complete single-row and double-row tapered roller bearings. It also specifies the flange dimensions of flanged outer rings for a selection of these bearings. A series designation for each bearing is also specified.
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ISO 15242-4:2017 specifies vibration measuring methods for single-row and double-row radial cylindrical roller bearings with cylindrical bore and outside surface, under established measurement conditions.
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This document specifies the testing and evaluation method of rolling bearing grease noise in accordance with the method NQ.
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This document specifies: — basic principles, testing assembly and the test machine for noise testing of rolling bearing greases; — symbols used in the test methods BQ+, MQ and NQ. This document is applicable for testing rolling bearing greases, especially of unused grease. NOTE Suitable greases are greases of NLGI classes 1 to 3 according to DIN 51818[6]. Suitable greases for lubrication of rolling bearings are especially greases according to ISO 12924. The test method according to this document delivers meaningful results for rolling bearings; however, it can also be applied for greases in similar applications[12][13].
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This document specifies the testing and evaluation method of rolling bearing grease noise in accordance with the method MQ.
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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 speed. Heating of the assembly is then generated by the bearing.
Thrust ball bearings are excluded from this document as kinematic effects do not allow the thermal speed rating defined in this document to be applied.
NOTE 1 In Annex A mean values for the coefficients f0r and f1r are given ? f0r for calculating viscous losses of oil bath lubricated bearings and f1r for calculating frictional losses of bearings.
NOTE 2 Explanatory notes on the limiting criterion are given in Annex B.
NOTE 3 In Annex C the reference conditions for grease lubrication are defined. The reference conditions are chosen such that the thermal speed rating for grease lubrication is identical to that for oil bath lubrication.
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ISO 15:2017 specifies preferred boundary dimensions for radial bearings of the diameter series 7, 8, 9, 0, 1, 2, 3 and 4.
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This document specifies the testing and evaluation method of rolling bearing grease noise in accordance with the method BQ+.
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This document specifies dimensional and geometrical characteristics, nominal boundary dimensions and tolerance values for finished steel needle rollers used as rolling elements.
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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 not applicable to designs where the rolling elements operate directly on the slide surface of the machine equipment, unless that surface is equivalent in all respects to the raceway of the linear motion rolling bearing component it replaces.
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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 of the machine equipment, unless that surface is equivalent in all respects to the raceway of the linear motion rolling bearing component it replaces.
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ISO 7063 specifies dimensional characteristics, nominal boundary dimensions and tolerance values for needle roller bearing track rollers, yoke and stud types.
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This document classifies different modes of failure occurring in service for rolling bearings made of
standard bearing steels. For each failure mode, it defines and describes the characteristics, appearance
and possible root causes of failure. It will assist in the identification of failure modes based on
appearance.
For the purposes of this document, the following terms are explained:
— failure of a rolling bearing: the result of a damage that prevents the bearing meeting the intended
design performance or marks the end of service life;
— in service: as soon as the bearing has left the manufacturer’s factory;
— visible features: those that are possible to observe directly or with magnifiers or optical microscopes,
also those from pictures, but only with the use of non-destructive methods.
Consideration is restricted to characteristic forms of change in appearance and failure that have welldefined
appearance and which can be attributed to particular causes with a high degree of certainty.
The features of particular interest for explaining changes and failures are described. The various forms
are illustrated with photographs and the most frequent causes are indicated.
If the root cause cannot be reliably assessed by the examination and characterization of visual
features against the information in this document, then additional investigations are to be considered.
These methods are summarized in A.3 and may involve, for example, the use of invasive methods
possibly including taking of cross sections, metallurgical structural analysis by visual and electronic
microscopes, chemical and spectrographic analysis. These specialized methods are outside the scope of
this document.
The failure mode terms shown in the subclause titles are recommended for general use. Where
appropriate, alternative expressions or synonyms used to describe the submodes are given and
explained in A.4.
Examples of rolling bearing failures are given in A.2, together with a description of the causes of failure
and proposed corrective actions.
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This document specifies the dimensional and geometrical characteristics, boundary dimensions and tolerances of insert bearings and eccentric locking collars and the radial internal clearances of insert bearings.
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This document specifies bearing and subunit boundary dimensions for complete single-row and double-row tapered roller bearings. It also specifies the flange dimensions of flanged outer rings for a selection of these bearings. A series designation for each bearing is also specified.
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This document specifies the boundary dimensions, other relevant dimensions and the corresponding tolerances of accessories for sleeve type linear ball bearings which are specified in ISO 10285. This document applies to: — the following housings: — closed and adjustable flangeless housings for series 1 sleeve type linear ball bearings, — closed and adjustable flanged housings for series 3 sleeve type linear ball bearings, — open flanged housings for series 3 sleeve type linear ball bearings, — closed and adjustable flangeless housings for series 3 sleeve type linear ball bearings, — open and open adjustable flangeless housings for series 3 sleeve type linear ball bearings; — the following shaft support rails: — standard height shaft support rails for series 3 sleeve type linear ball bearings, — low height shaft support rails for series 3 sleeve type linear ball bearings; — the following shaft support blocks: — flanged shaft support blocks for series 1 and 3 sleeve type linear ball bearings, — flangeless shaft support blocks for series 1 and 3 sleeve type linear ball bearings; — solid and tubular shafts for series 1 and 3 sleeve type linear ball bearings.
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This document specifies the boundary dimensions, other relevant dimensions and the corresponding tolerances of accessories for sleeve type linear ball bearings which are specified in ISO 10285. This document applies to: — the following housings: — closed and adjustable flangeless housings for series 5 sleeve type linear ball bearings, — open and open adjustable flangeless housings for series 5 sleeve type linear ball bearings; — standard height shaft support rails for series 5 sleeve type linear ball bearings; — flanged shaft support blocks for series 5 sleeve type linear ball bearings; — solid and tubular shafts for series 5 sleeve type linear ball bearings.
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This document specifies a method for the determination of the strength of finished ceramic balls for ball bearings, preferably made of silicon nitride (Si3N4), with ball diameters from 3 mm to 50 mm. NOTE 1 ISO 26602 specifies the requirements for preprocessed silicon nitride materials for rolling bearing balls. ISO 3290-2 specifies requirements for finished silicon nitride balls for rolling bearings. NOTE 2 Other test methods to determine ceramic ball strength can be found in Reference [7]. The results of the strength tests slightly depend on the Poisson's ratio. For this reason, all calculations are restricted to a Poisson's ratio ranging from 0,15 to 0,35. This includes the Poisson's ratio of a typical silicon nitride ceramic used as rolling element in ball bearings. The method can also be used for rolling bearing balls made of other ceramic materials, but the reported prefactors may not be valid. NOTE 3 Poisson's ratio of isotropic materials can be determined by one of the methods given in ISO 17561. Because of the (defect controlled) brittle fracture behaviour of ceramic materials, a significant scatter of individual results in the characterization of a series of nominally identical samples can occur. NOTE 4 A further statistical analysis according to ISO 20501 can be carried out.
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This document specifies dimensional and geometrical characteristics, nominal boundary dimensions and tolerance values for finished steel needle rollers used as rolling elements.
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This document specifies dimensional characteristics, nominal boundary dimensions and tolerance values for needle roller bearing track rollers, yoke and stud types.
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