Codeofchina.com is in charge of this English translation. In case of any doubt about the English translation, the Chinese original shall be considered authoritative.
This Standard is equivalent to ISO 15:1998 "Rolling Bearings-Radial Bearings — Boundary Dimensions, General Plan". This Standard is the revision of GB/T 273.3-1988 "Rolling Bearings — Radial Bearings - Boundary Dimensions".
Compared with GB/T 273.3-1988, the main changes on technical contents in this Standard are as follows:
1) Diameter series 7 has been extended and provided with the new dimension series 27 and 47 (Table 1);
2) Diameter series 1 has been extended and provided with the new dimension series 51 and 61 (Table 5)
3) The dimension series 52 and 62 have been added to diameter series 2 (Table 6).
This Standard will replace GB/T 273.3-1988 from the implementation date hereof.
Appendix A of this Standard is informative
This Standard was proposed by State Administration of Machinery Industry.
This Standard is under the jurisdiction of the National Technical Committee on Rolling Bearing of Standardization Administration of China.
Drafting organization of this Standard: Luoyang Bearing Research Institute.
Chief drafting staff of this Standard: Li Feixue.
This Standard was issued for the first time in 1964, revised for the first time in 1982 and revised in 1988 for the second time.
ISO Foreword
International Standard ISO 15:1997 was prepared by Technical Committee ISO/TC 4, Rolling bearings.
This second edition cancels and replaces the first edition (ISO 15:1981), which has been technically revised and extended. Diameter series 7 has been extended and provided with the new dimension series 27 and 47. Diameter series 1 has been extended and provided with the new dimension series 51 and 61. The dimension series 52 and 62 have been added to diameter series 2.
Appendix A and Appendix B of this International Standard are for information only.
Note: Appendix B of ISO 15 is quoted in this national standard as a normative reference.
Introduction
The object of this Standard is to restrict the number of radial bearing sizes enough to ensure economic production, yet to provide a sufficient number of sizes to satisfy present and future needs of bearing users. These needs are very comprehensive and varying. Therefore the plan has to embrace a wide range of numerically determined sizes and proportions and may even be extended in accordance with the rules given in Appendix A of this Standard.
NATIONAL STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
中华人民共和国国家标准
Rolling Bearings — Radial Bearing — Boundary Dimensions, General Plan
滚动轴承 向心轴承 外形尺寸总方案
GB/T 273.3-1999
eqv ISO 15:1998
Replace GB/T 273.3-1988
1 Scope
This Standard lays down preferred boundary dimensions for radial bearings.
This Standard is not applicable to the tapered roller bearings, insert bearings and some types of needle roller bearings, airframe bearings and instrument precision bearings with standardized dimensions.
2 Normative References
The following standards contain provisions which, through reference in this text, constitute provisions of this Standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this Standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below.
GB/T 274-1991 Rolling Bearings — Chamfer Dimension Limits
GB/T 321-1980 Preferred Numbers and Preferred Number Series
3 Symbols and Abbreviated Terms (see Figure 1)
Figure 1 Radial Bearing
B: bearing width
D: outside diameter
d: bore diameter
r: chamfer dimension
rs,min: smallest single chamfer dimension
4 Boundary Dimensions
The symbols shown in the figures and given in the tables denote nominal dimensions unless specified otherwise.
4.1 Optimal boundary dimensions for radial bearings shall meet the requirements of Tables 1 to 8.
4.2 The chamfer dimensions given in Tables 1 to 8 do not always apply to:
— the groove side of bearing rings with snap ring groove;
— the loose rib and the non-rib sides of cylindrical roller bearing rings;
— the non-thrust side of angular contact bearing outer rings.
4.3 The chamfer dimensions for inner rings of bearings with tapered bore may be smaller than those shown in Tables 1 to 8. The corresponding largest single chamfer dimensions to the rs,min dimensions in the tables are given in GB/T 274.
4.4 The exact shape of the chamfer surface is not specified, but its contour in an axial plane shall not be allowed to project beyond the imaginary circular arc, of radius rs,min, tangential to the ring face and the bore or outside cylindrical surface of the ring.
Contents
Foreword I
ISO Foreword II
Introduction III
1 Scope
2 Normative References
3 Symbols and Abbreviated Terms (see Figure 1)
4 Boundary Dimensions
Appendix A
Codeofchina.com is in charge of this English translation. In case of any doubt about the English translation, the Chinese original shall be considered authoritative.
This Standard is equivalent to ISO 15:1998 "Rolling Bearings-Radial Bearings — Boundary Dimensions, General Plan". This Standard is the revision of GB/T 273.3-1988 "Rolling Bearings — Radial Bearings - Boundary Dimensions".
Compared with GB/T 273.3-1988, the main changes on technical contents in this Standard are as follows:
1) Diameter series 7 has been extended and provided with the new dimension series 27 and 47 (Table 1);
2) Diameter series 1 has been extended and provided with the new dimension series 51 and 61 (Table 5)
3) The dimension series 52 and 62 have been added to diameter series 2 (Table 6).
This Standard will replace GB/T 273.3-1988 from the implementation date hereof.
Appendix A of this Standard is informative
This Standard was proposed by State Administration of Machinery Industry.
This Standard is under the jurisdiction of the National Technical Committee on Rolling Bearing of Standardization Administration of China.
Drafting organization of this Standard: Luoyang Bearing Research Institute.
Chief drafting staff of this Standard: Li Feixue.
This Standard was issued for the first time in 1964, revised for the first time in 1982 and revised in 1988 for the second time.
ISO Foreword
International Standard ISO 15:1997 was prepared by Technical Committee ISO/TC 4, Rolling bearings.
This second edition cancels and replaces the first edition (ISO 15:1981), which has been technically revised and extended. Diameter series 7 has been extended and provided with the new dimension series 27 and 47. Diameter series 1 has been extended and provided with the new dimension series 51 and 61. The dimension series 52 and 62 have been added to diameter series 2.
Appendix A and Appendix B of this International Standard are for information only.
Note: Appendix B of ISO 15 is quoted in this national standard as a normative reference.
Introduction
The object of this Standard is to restrict the number of radial bearing sizes enough to ensure economic production, yet to provide a sufficient number of sizes to satisfy present and future needs of bearing users. These needs are very comprehensive and varying. Therefore the plan has to embrace a wide range of numerically determined sizes and proportions and may even be extended in accordance with the rules given in Appendix A of this Standard.
NATIONAL STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
中华人民共和国国家标准
Rolling Bearings — Radial Bearing — Boundary Dimensions, General Plan
滚动轴承 向心轴承 外形尺寸总方案
GB/T 273.3-1999
eqv ISO 15:1998
Replace GB/T 273.3-1988
1 Scope
This Standard lays down preferred boundary dimensions for radial bearings.
This Standard is not applicable to the tapered roller bearings, insert bearings and some types of needle roller bearings, airframe bearings and instrument precision bearings with standardized dimensions.
2 Normative References
The following standards contain provisions which, through reference in this text, constitute provisions of this Standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this Standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below.
GB/T 274-1991 Rolling Bearings — Chamfer Dimension Limits
GB/T 321-1980 Preferred Numbers and Preferred Number Series
3 Symbols and Abbreviated Terms (see Figure 1)
Figure 1 Radial Bearing
B: bearing width
D: outside diameter
d: bore diameter
r: chamfer dimension
rs,min: smallest single chamfer dimension
4 Boundary Dimensions
The symbols shown in the figures and given in the tables denote nominal dimensions unless specified otherwise.
4.1 Optimal boundary dimensions for radial bearings shall meet the requirements of Tables 1 to 8.
4.2 The chamfer dimensions given in Tables 1 to 8 do not always apply to:
— the groove side of bearing rings with snap ring groove;
— the loose rib and the non-rib sides of cylindrical roller bearing rings;
— the non-thrust side of angular contact bearing outer rings.
4.3 The chamfer dimensions for inner rings of bearings with tapered bore may be smaller than those shown in Tables 1 to 8. The corresponding largest single chamfer dimensions to the rs,min dimensions in the tables are given in GB/T 274.
4.4 The exact shape of the chamfer surface is not specified, but its contour in an axial plane shall not be allowed to project beyond the imaginary circular arc, of radius rs,min, tangential to the ring face and the bore or outside cylindrical surface of the ring.
Contents of GB/T 273.3-1999
Contents
Foreword I
ISO Foreword II
Introduction III
1 Scope
2 Normative References
3 Symbols and Abbreviated Terms (see Figure 1)
4 Boundary Dimensions
Appendix A
