Detail of GB/T 307.1-2017

Introduction of GB/T 307.1-2017

GB/T 307 consists of the following four parts: ——GB/T 307.1 Rolling bearings - Radial bearings - Geometrical product specifications (GPS) and tolerance values; ——GB/T 307.2 Rolling bearings - Measuring and gauging principles and methods; ——GB/T 307.3 Rolling bearings - General technical regulations; ——GB/T 307.4 Rolling bearings - Thrust bearings - Geometrical product specifications (GPS) and tolerance values This is Part 1 of GB/T 307. This part is developed in accordance with the rules given in GB/T 1.1-2009. This part replaces GB/T 307.1-2005 Rolling bearings - Radial bearings - Tolerance and the following main technical changes are made with respect to GB/T 307.1-2005: ——The standard name is modified (see cover and front page; cover and front page of Edition 2005); ——The symbol meaning and expression methods are modified (see Clause 4; Clause 4 of Edition 2005); ——Drawing indications are added (see Figures 1~17); ——The tolerance values of SD and SD1 are modified (see Tables 7, 9, 11, 17, 20 and 23; Tables 6, 8, 10, 16, 19 and 22 of Edition 2005); ——Four annexes and the Bibliography are added (see Annexes A to D and Bibliography). This part, by means of translation, is identical to ISO 492:2014 Rolling bearings - Radial bearings - Geometrical product specifications (GPS) and tolerance values. The Chinese documents identical to the normative international documents given in this part are as follows: ——GB/T 273.3-2015 Rolling bearings - Boundary dimensions, general plan - Part 3: Radial bearings (ISO 15:2011, IDT) ——GB/T 274-2000 Rolling bearings - Chamfer dimension - Maximum values (idt ISO 582:1995) ——GB/T 1182-2008 Geometrical product specifications (GPS) - Geometrical tolerances of form orientation location and run-out (ISO 1101: 2004, IDT) ——GB/T 6930-2002 Rolling bearings - Vocabulary (ISO 5593: 1997, IDT) This part was proposed by the China Machinery Industry Federation. This part is under the jurisdiction of the National Technical Committee on Rolling Bearing of Standardization Administration of China (SAT/TC 98). The previous editions of this part are as follows: ——GB 307-1964 (Part) and GB 307-1977 (Part); ——GB 307.1-1984 (Part) and GB 7812-1987; ——GB/T 307.1-1994 and GB/T 307.1-2005.  Introduction This part is a machine element geometry standard as defined in the geometrical product specification (GPS) system as presented in master plan of ISO/TR 14638 [12]. The fundamental rules of ISO/GPS given in ISO 8015 [8] apply to this part and the default decision rules given in ISO 14253-1 [10] apply to the specifications made in accordance with this part, unless otherwise indicated. The connection between functional requirements, measuring technique and measuring uncertainty is always intended to be considered. The traditionally used measuring technique is described in ISO 1132-2 [5]. For measurement uncertainty, it is intended that ISO 14253-2 [11] shall be considered. Rolling bearings - Radial bearings - Geometrical product specifications (GPS) and tolerance values 1 Scope This part of GB/T 307 specifies dimensional and geometrical characteristics, limit deviations 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 [7]. This part 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 and instrument precision bearings). Tolerances for such bearings are given in the relevant standards. Chamfer dimension limits are given in ISO 582. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 15 Rolling bearings - Radial bearings - Boundary dimensions, general plan ISO 582 Rolling bearings - Chamfer dimensions - Maximum values ISO 1101 Geometrical product specifications (GPS) - Geometrical tolerancing - Tolerances of form, orientation, location and run-out ISO 5593 Rolling bearings - Vocabulary ISO 14405-1 Geometrical product specifications (GPS) - Dimensional tolerancing – Part 1: Linear sizes ISO/TS 17863 Geometrical product specification (GPS) - Geometrical tolerancing of moveable assemblies 3 Terms and definitions For the purposes of this document, the terms and definitions given in ISO 1101, ISO 5593, ISO 14405-1, and ISO/TS 17863 apply.   4 Symbols To express that the ISO/GPS system, ISO 8015 [8], is applied, the dimensional and geometrical characteristics shall be included in the technical product documentation (for example, on the drawing). The dimensional and geometrical specifications, associated to these characteristics are described in Table 1 and Figures 1 to 17. Descriptions for symbols are in accordance with GPS terminology; relationships with traditional terms are described in Annex A. A tolerance value associated to a characteristic is symbolised by t followed by the symbol for the characteristic, for example tVBs. In this part, the ISO default specification operator for size is in accordance with ISO 14405-1, i.e. the two-point size is valid. Some specification modifiers are described in Annex D. The detailed definitions for terms in ISO 1101 and ISO 14405-1 and traditional terms in ISO 1132-1 [4] are not fully equal. For differences, see Annex C. Table 1 Symbols for nominal sizes, characteristics, and specification modifiers Symbol for nominal dimension (size and distance)a Symbol for characteristica GPS symbol and specification modifierb,c Descriptiond See Figure B Nominal inner ring width 1; 2; 12 VBS Symmetrical rings: range of two-point sizes of inner ring width 1; 12 Asymmetrical rings: range of minimum circumscribed sizes of inner ring width, between two opposite lines, obtained from any longitudinal section which includes the inner ring bore axis 2; 7 ΔBS Symmetrical rings: deviation of a two-point size of inner ring width from its nominal size 1; 12 Asymmetrical rings, upper limit: deviation of a minimum circumscribed size of inner ring width, between two opposite lines, in any longitudinal section which includes the inner ring bore axis, from its nominal size 2; 7 Asymmetrical rings, lower limit: deviation of a two-point size of inner ring width from its nominal size C Nominal outer ring width 1; 7; 12 VCS Symmetrical rings: range of two-point sizes of outer ring width 1; 7 Asymmetrical rings: range of minimum circumscribed sizes of outer ring width between two opposite lines, obtained from any longitudinal section which includes the outer ring outside surface axis 2; 12 ΔCS Symmetrical rings: deviation of a two-point size of outer ring width from its nominal size 1; 7 Asymmetrical rings, upper limit: deviation of a minimum circumscribed size of outer ring width, between two opposite lines, in any longitudinal section which includes the outer ring outside surface axis, from its nominal size 2; 12 Asymmetrical rings, lower limit: deviation of a two-point size of outer ring width from its nominal size C1 Nominal outer ring flange width 12 VC1S Range of two-point sizes of outer ring flange width 12 ΔC1S Deviation of a two-point size of outer ring flange width from its nominal size 12 d Nominal bore diameter of a cylindrical bore or at the theoretical small end of a tapered bore 1~7; 12~16 Vdmp Range of mid-range sizes (out of two-point sizes) of bore diameter obtained from any cross-section of a cylindrical bore 1; 2; 12 Δdmp Cylindrical bore: deviation of a mid-range size (out of two-point sizes) of bore diameter in any cross-section from its nominal size 1; 2; 12 Tapered bore: deviation of a mid-range size (out of two-point sizes) of bore diameter at the theoretical small end from its nominal size 7 Vdsp Range of two-point sizes of bore diameter in any cross-section of a cylindrical or tapered 1; 2; 7,12 Δds Deviation of a two-point size of bore diameter of a cylindrical bore from its nominal size 1; 2; 12 d1 Nominal diameter at the theoretical large end of a tapered bore 7 Δd1mp Deviation of a mid-range size (out of two-point sizes) of bore diameter at the theoretical large end of a tapered bore from its nominal size 7 D Nominal outside diameter 1~16 VDmp Range of mid-range sizes (out of two-point sizes) of outside diameter obtained from any cross-section 1; 2; 7,12 ΔDmp Deviation of a mid-range size (out of two-point sizes) of outside diameter in any cross- section from its nominal size 1; 2; 7,12 VDsp Range of two-point sizes of outside diameter in any cross-section 1; 2; 7,12 ΔDs Deviation of a two-point size of outside diameter from its nominal size 1; 2; 7,12 D1 Nominal outside diameter of outer ring flange 12 ΔD1s Deviation of a two-point size of outside diameter of outer ring flange from its nominal size 12 Kea Circular radial run-out of outer ring outside surface of assembled bearing with respect to datum, i.e. axis, established from the inner ring bore surface 4; 5; 6; 9; 10; 11; 14;15; 16 Kia Circular radial run-out of inner ring bore surface of assembled bearing with respect to datum, i.e. axis, established from the outer ring outside surface 4; 5; 6; 9; 10; 11; 14; 15; 16 Sd Circular axial run-out of inner ring face with respect to datum, i.e. axis, established from the inner ring bore surface 3; 8; 13 SD Perpendicularity of outer ring outside surface axis with respect to datum established from the outer ring face 3; 8 SD1 Perpendicularity of outer ring outside surface axis with respect to datum established from the outer ring flange back face 13 Sea Circular axial run-out of outer ring face of assembled bearing with respect to datum, i.e. axis, established from the inner ring bore surface 5; 6; 10; 11 Seal Circular axial run-out of outer ring flange back face of assembled bearing with respect to datum, i.e. axis, established from the inner ring bore surface 15; 16 Sia Circular axial run-out of inner ring face of assembled bearing with respect to datum, i.e. axis, established from the outer ring outside surface 5; 6; 10; 11; 15; 16 SLh Taper slope is the difference between nominal diameters at the theoretical large end and small end of a tapered bore (d1-d) 7 ΔSL Deviation of taper slope of a tapered inner ring bore from its nominal size 7 T Nominal assembled bearing width 17 ΔTs Deviation of minimum circumscribed size of assembled bearing width from its nominal size 17 T1 Nominal effective width of inner subunit assembled with a master outer ring 17 ΔT1s Deviation of minimum circumscribed size of effective width (inner subunit assembled with a master outer ring) from its nominal size 17 T2 Nominal effective width of outer ring assembled with a master inner subunit 17 ΔT2s Deviation of minimum circumscribed size of effective width (outer ring assembled with a master inner subunit) from its nominal size 17 TF Nominal assembled flanged bearing width 17 ΔTFs Deviation of minimum circumscribed size of assembled flanged bearing width from its nominal size 17 TF2 Nominal effective width of flanged outer ring assembled with a master inner subunit 17 ΔTF2s Deviation of minimum circumscribed size of effective width (flanged outer ring assembled with a master inner subunit) from its nominal size 17 α Frustum angle of tapered inner ring bore 7; 8; 9; 10; 11 αk Distance from face to define the restricted area for SD or SD1 3; 8; 13 a Symbols as defined in ISO 15241[14] except for the format used. b Symbols as defined in ISO 1101 and ISO 14405-1. c Specification modifier shall not be indicated on a drawing, if the two-point size is applied for both specified limits. d Description based on ISO 1101, ISO 5459 [7] and ISO 14405-1. e Specification modifier is not appropriate in cases where no opposite material is existing, e.g. tapered roller bearing outer ring with large back face chamfer and small front face. Solutions need to be developed within the framework of the GPS system and considered in future revisions of this part. f Specification modifier can be omitted on the drawing. g Symbols for direction of gravity , fixed parts and movable parts according to ISO/TS 17863; see Figures 4, 5, 6, 9, 10, 11, 14, 15, 16, and 17. h SL is a distance. i Description based on ISO 1119.[3] k For rsmin ≤ 0.6: a=rsmax,axial+0.5; for rsmin>0.6: a=1.2×rsmax,axial; rsmax,axial, see ISO 582. For definitions of rsmin and rsmax,axial, see ISO 582. The indications in Figures 1 to 17 illustrate the correlation of interface dimensions and corresponding dimensional and geometrical tolerance symbols. The specifications for single components are illustrated in Figures 1, 2, 3, 7, 8, 12 and 13. The specifications for assembled components are illustrated in Figures 4, 5, 6, 9, 10, 11, 14, 15, 16, and 17. Note: Figures 1 to 17 are drawn schematically and do not necessarily show all design details. Two examples of a real drawing indication are given in Annex B. Figure 1 Size specification for single components for bearing with cylindrical bore and symmetrical rings Note: tVBs and tVCs are not relevant for tapered roller bearings. Figure 2 Size specification for single components for bearing with cylindrical bore and asymmetrical rings   Figure 3 Geometrical tolerances for single components for bearing with cylindrical bore Figure 4 Geometrical tolerances for assembled bearing with cylindrical bore - Cylindrical roller bearing, spherical roller bearing, toroidal roller bearing and self‑aligning ball bearing Figure 5 Geometrical tolerances for assembled bearing with cylindrical bore - Deep-groove ball bearing, double‑row deep‑groove ball bearing, double‑row angular contact ball bearing and four-point-contact ball bearing Figure 6 Geometrical tolerances for assembled bearing with cylindrical bore - Single-row angular contact ball bearing and tapered roller bearing Note: For indications on asymmetrical outer rings, see Figure 2. Figure 7 Size specification for single components for bearing with tapered bore Figure 8 Geometrical tolerances for single components for bearing with tapered bore Figure 9 Geometrical tolerances for assembled bearing with tapered bore - Cylindrical roller bearing, spherical roller bearing, toroidal roller bearing and self‑aligning ball bearing Figure 10 Geometrical tolerances for assembled bearing with tapered bore - Deep-groove ball bearing, double‑row deep‑groove ball bearing, double‑row angular contact ball bearing and four-point-contact ball bearing Figure 11 Geometrical tolerances for assembled bearing with tapered bore - Single-row angular contact ball bearing and tapered roller bearing Note: See Figure 2 for indications on asymmetrical inner ring. Figure 12 Size specification for single components for bearing with flanged outer ring Figure 13 Geometrical tolerances for single components for bearing with flanged outer ring Figure 14 Geometrical tolerances for assembled bearing with flanged outer ring - Cylindrical roller bearing, spherical roller bearing, toroidal roller bearing and self‑aligning ball bearing Figure 15 Geometrical tolerances for assembled bearing with flanged outer ring - Deep-groove ball bearing, double‑row deep‑groove ball bearing, double‑row angular contact ball bearing and four-point-contact ball bearing Figure 16 Geometrical tolerances for assembled bearing with flanged outer ring - Single-row angular contact ball bearing and tapered roller bearing  Key 1——Master outer ring 2——Master inner subunit Figure 17 Additional symbols for assembled tapered roller bearings 5 Limit deviations and tolerance values 5.1 General The bore diameter limit deviations and tolerance values for cylindrical bores are given in 5.2 and 5.3 and for flanges in 5.4. The limit deviations and tolerance values for tapered bore are given in 5.5. The diameter series referred to in Tables 2 to 11 are those defined in ISO 15. In the Tables 2 to 27 the symbols U and L are used as follows: U——upper limit deviation; L——lower limit deviation. 5.2 Radial bearings except tapered roller bearings 5.2.1 Tolerance class - Normal See Tables 2 and 3. Table 2 Radial bearings except tapered roller bearings - Inner ring- Tolerance class - Normal Limit deviations and tolerance values in micrometres d mm tΔdmp tVdsp tVdmp tKin tΔBs tVBs Diameter series All Normal Modified a > ≤ U L 9 0, 1 2, 3, 4 U L - 0.6 2.5 10 18 30 50 80 120 180 250 315 400 500 630 800 1 000 1 250 1 600 0.6 2.5 10 18 30 50 80 120 180 250 315 400 500 630 800 1 000 1 250 1 600 2 000 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 -8 -8 -8 -8 -10 -12 -15 -20 -25 -30 -35 -40 -45 -50 -75 -100 -125 -160 -200 10 10 10 10 13 15 19 25 31 38 44 50 56 63 - - - - - 8 8 8 8 10 12 19 25 31 38 44 50 56 63 - - - - - 6 6 6 6 8 9 11 15 19 23 26 30 34 38 - - - - - 6 6 6 6 8 9 11 15 19 23 26 30 34 38 - - - - - 10 10 10 10 13 15 20 25 30 40 50 60 65 70 80 90 100 120 140 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 -40 -40 -120 -120 -120 -120 -150 -200 -250 -300 -350 -400 -450 -500 -750 -1 000 -1 250 -1 600 -2 000 - - -250 -250 -250 -250 -380 -380 -500 -500 -500 -630 - - - - - - - 12 12 15 20 20 20 25 25 30 30 35 40 50 60 70 80 100 120 140 a Applies to inner rings and outer rings of single bearings made for paired and stack assemblies. Also applies to inner rings with tapered bore with d ≥ 50mm.   Table 3 Radial bearings except tapered roller bearings - Outer ring - Tolerance class - Normal Limit deviations and tolerance values in micrometres D mm tΔDmp tVdspa tVDmpa tKea tΔCs tΔClsb tVCs tVClsb Open bearings Capped bearings Diameter series > ≤ U L 9 0, 1 2, 3, 4 2, 3, 4 U L - 2.5 6 18 30 50 80 120 150 180 2.5 6 18 30 50 80 120 150 180 250 0 0 0 0 0 0 0 0 0 0 -8 -8 -8 -9 -11 -13 -15 -18 -25 -30 10 10 10 12 14 16 19 23 31 38 8 8 8 9 11 13 19 23 31 38 6 6 6 7 8 10 11 14 19 23 10 10 10 12 16 20 26 30 38 - 6 6 6 7 8 10 11 14 19 23 15 15 15 15 20 25 35 40 45 50 Identical to tΔBs and tVBs of an inner ring of the same bearing as the outer ring 250 315 400 500 630 800 1 000 1 250 1 600 2 000 315 400 500 630 800 1 000 1 250 1 600 2 000 2 500 0 0 0 0 0 0 0 0 0 0 -35 -40 -45 -50 -75 -100 -125 -160 -200 -250 44 50 56 63 94 125 - - - - 44 50 56 63 94 125 - - - - 26 30 34 38 55 75 - - - - - - - - - - - - - - 26 30 34 38 55 75 - - - - 60 70 80 100 120 140 160 190 220 250 Note: The limit deviations for the outside diameter, D1, of an outer ring flange are given in Table 25. a Applies before mounting and after removal of internal or external snap ring. b Applies to groove ball bearings only.

Contents of GB/T 307.1-2017

Foreword i Introduction iii 1 Scope 2 Normative references 3 Terms and definitions 4 Symbols 5 Limit deviations and tolerance values 5.1 General 5.2 Radial bearings except tapered roller bearings 5.3 Radial tapered roller bearings 5.4 Radial bearings, outer ring flanges 5.5 Basically tapered bores, tapers 1:12 and 1: Annex A (Informative) Symbols and terms as given in the standard of Version 2005 in relation to descriptions given in this standard Annex B (Informative) Example of drawing indications of characteristics with specification for radial bearings Annex C (Informative) Illustration of ISO 1132-1 and ISO 14405-1 terms and definitions Annex D (Informative) Description with illustrations for specification modifiers of linear sizes Bibliography