GB/T 272-2017 PDF in English
GB/T 272-2017 (GB/T272-2017, GBT 272-2017, GBT272-2017)
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Rolling bearings -- Identification code
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| GB/T 272-1993 | English | 919 |
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Rolling bearing. Identification code
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Standards related to (historical): GB/T 272-2017
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GB/T 272-2017: PDF in English (GBT 272-2017) GB/T 272-2017
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 21.100.20
J 11
Replacing GB/T 272-1993
Rolling bearings - Identification code
ISSUED ON: JULY 12, 2017
IMPLEMENTED ON: FEBRUARY 01, 2018
Issued by: General Administration of Quality Supervision, Inspection and
Quarantine;
Standardization Administration of PRC.
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative references ... 5
3 Terms and definitions ... 9
4 Symbols ... 9
5 Composition of bearing code ... 10
6 Basic code (except needle roller bearings) ... 10
7 Basic code of needle roller bearing ... 17
8 Compilation rules of basic code ... 18
9 Pre-positioned and post-positioned code ... 18
10 Bearings with accessories ... 29
11 Special representation... 29
12 Special bearing code ... 30
13 Preparation requirements ... 30
Appendix A (Normative) Code of tapered roller bearing conforming to GB/T
273.1 ... 31
Appendix B (Normative) Bearing variant structure code ... 33
Appendix C (Normative) Bearings without a cage post-positioned code ... 42
Appendix D (Normative) Compilation method of non-standard bearing code 44
Appendix E (Normative) Special bearing code... 47
Rolling bearings - Identification code
1 Scope
This standard specifies the method for compiling codes for rolling bearings
(hereinafter referred to as bearings) and their components.
This standard applies to bearings for general use.
2 Normative references
The following documents are essential to the application of this document. For
the dated documents, only the versions with the dates indicated are applicable
to this document; for the undated documents, only the latest version (including
all the amendments) is applicable to this standard.
GB/T 273.1 Rolling bearings Overall dimension plan Part 1: Tapered roller
bearings
GB/T 273.2 Rolling bearings - Tapered roller bearing - Plan of boundary
dimensions
GB/T 273.3 Rolling bearings - Boundary dimensions, general plan - Part 3:
Radial bearings
GB/T 276 Rolling bearings - Deep groove ball bearings - Boundary
dimensions
GB/T 281 Rolling bearings - Self-aligning ball bearings - Boundary
dimensions
GB/T 283 Rolling bearings - Cylindrical roller bearings - Boundary
dimensions
GB/T 285 Rolling bearings - Double row cylindrical roller bearings -
Boundary dimensions
GB/T 288 Rolling bearings - Self-aligning roller bearings - Boundary
dimensions
GB/T 290 Rolling bearings - Needle roller bearings with drawn cup and
without inner ring - Boundary dimensions
GB/T 16643 Rolling bearings - Combined needle roller - Thrust roller
bearings - Boundary dimensions
GB/T 20056 Rolling bearings - Radial needle roller and cage assemblies -
Boundary dimensions and tolerances
GB/T 24604 Rolling bearings - Angular contact thrust ball bearings used for
machine tool screws
GB/T 25760 Rolling bearings - Combined needle roller bearings with thrust
ball bearings - Boundary dimensions
GB/T 25761 Rolling bearings - Combined needle roller bearings with angular
contact ball bearings - Boundary dimensions
GB/T 25762 Rolling bearings - Needle roller and cage assemblies for
motorcycle connecting rod
GB/T 25763 Rolling bearings - Needle roller bearings for automotive
transmission
GB/T 25764 Rolling bearings - Roller bearings for automobile transmission
GB/T 25765 Rolling bearings - Ball bearings for automotive transmission
GB/T 25768 Rolling bearings - Combined needle roller bearings with double
direction thrust cylindrical roller bearings
GB/T 25770 Rolling bearings - Bearings for railway wagon
GB/T 25771 Rolling bearings - Bearings for railway locomotive
GB/T 25772 Rolling bearings - Bearings for railway passenger coach
GB/T 27554 Rolling bearings - Insert bearing units - Identification code
GB/T 27559 Rolling bearings - Cylindrical roller bearings for spindles of
machines
GB/T 28697 Rolling bearings - Aligning thrust ball bearings and aligning seat
washers - Boundary dimensions
GB/T 29717 Rolling bearings - Wind power generators yaw and pitch
bearings
GB/T 29718 Rolling bearings - Wind power generators main bearings
JB/T 3232 Rolling bearings - Needle roller bearings for universal joints
JB/T 10531 Rolling bearings - Double-row angular contact bearings for
electromagnetic clutch of car air-conditioner
JB/T 10857 Rolling bearings - Disc bearings for agricultural machinery
JB/T 10859 Rolling bearings - Tensioner and idler bearings and units for
automotive engine
JB/T 11086 Rolling bearings - Overrunning clutches for motorcycles
JB/T 11251 Rolling bearings - Drawn cup needle roller clutches
JB/T 11252 Rolling bearings - One-way clutch bearings used for washing
machine
JB/T 11613 Rolling bearings - Needle roller bearings for starting motor of
gasoline/diesel engines
3 Terms and definitions
The terms and definitions as defined in GB/T 4199 and GB/T 6930 apply to this
document.
4 Symbols
The symbols as given in GB/T 7811 as well as the following symbols apply to
this document.
B: Nominal width of bearing
Bc: Nominal width of cage
C: Nominal width of drawn cup
D: Nominal outer diameter of bearing
Dc: Nominal outer diameter of cage
D1: Nominal outer diameter of thrust needle roller and cage assembly center
sleeve with stamping center sleeve
d: Nominal inner diameter of bearing
dc: Nominal inner diameter of cage
d1: Nominal diameter of bolt
Table 5 -- Code of inner diameter
Nominal inner diameter
of bearing, mm
Code of inner diameter Example
0.6 ~ 10 (non-integer)
It is directly expressed in millimeters
of nominal inner diameter,
separated by "/" between it and the
size series code
Deep groove ball bearing 617/0.6 d = 0.6
mm
Deep groove ball bearing 618/2.5 d = 2.5
mm
1 ~ 9 (integer)
It is directly expressed in millimeters
of the nominal inner diameter. For
deep groove and angular contact
ball bearing's diameter series 7, 8,
9, the inner diameter and the size
series code are separated by "/"
Deep groove ball bearing 625 d = 5 mm
Deep groove ball bearing 618/5 d = 5
mm
Angular contact ball bearing 707 d = 7
mm
Angular contact ball bearing 719/7 d = 7
mm
10 ~ 17
10 00
Deep groove ball bearing 6200 d = 10
mm
12 01
Self-aligning ball bearing 1201 d = 12
mm
15 02
Cylindrical roller bearing NU 202 d = 15
mm
17 03 Thrust ball bearing 51103 d = 17 mm
20 ~ 480 (except 22,
28, 32)
The quotient of the nominal inner
diameter divided by 5, the quotient
is a single digit, a "0" must be added
to the left of the quotient, such as 08
Self-aligning roller bearing 22308 d = 40
mm
Cylindrical roller bearing NU 1096 d =
480 mm
≥ 500 and 22, 28, 32
It is directly expressed in millimeters
of nominal inner diameter, but
separated from the size series by "/"
Self-aligning roller bearing 230/500 d =
500 mm
Deep groove ball bearing 62/22 d = 22
mm
6.6 Code example
Example 1: Self-aligning roller bearing 23224 2 - Type code, 32 - Size series code, 24
- Inner diameter code, d = 120 mm
Example 2: Deep groove ball bearing 6203 6 - Type code, 2 - Size series (02) code,
03 - Inner diameter code, d = 17 mm
Example 3: Deep groove ball bearing 617/0.6 6 - Type code, 17 - Size series code, 0.6
- Inner diameter code, d = 0.6 mm
Example 4: Cylindrical roller bearing N2210 N - Type code, 22 - Size series code, 10 -
Inner diameter code, d = 50 mm
Example 5: Angular contact ball bearing 719/7 7 - Type code, 19 - Size series code, 7
- Inner diameter code, d = 7 mm
9.3 Post-positioned code
9.3.1 Overview
The post-positioned code is indicated by letters (or plus numbers); the bearing
characteristics and arrangement sequence indicated by the post-positioned
code are in accordance with Table 8.
Table 8 -- Arrangement sequence of post-positioned codes
Group 1 2 3 4 5 6 7 8 9
Meaning
Internal
structure
Sealing and
dustproof and
external shape
Cage and
its
material
Bearing
parts
materials
Tolerance
class
Play Configuration
Vibration
and
noise
Others
9.3.2 Rules for compiling post-positioned codes
9.3.2.1 The post-positioned code is placed on the right side of the basic code
and half a Chinese character distance from the basic code (except for the
symbol "-" and "/" in the code). When there are many change items, there are
multiple groups of post-positioned codes, arranged in the order from left to right
as listed in Table 8.
9.3.2.2 If changing to the content after the 4th group (including 4th group), use
"/" before the code to separate the previous code.
Example: 6205-2Z/P6, 22308/P63
9.3.2.3 Change the content to the two groups after the 4th group. When the
meaning of numbers or words in the codes of the previous group and the
subsequent group may be confused, there shall be half a Chinese character
space between the two codes.
Example: 6208/P63 V1
9.3.3 Post-positioned code and meaning
9.3.3.1 Internal structure
The internal structure code is used to indicate bearings of the same type and
dimensions but with different internal structures. Its code and meaning are in
accordance with Table 9.
Appendix A
(Normative)
Code of tapered roller bearing conforming to GB/T 273.1
A.1 Code composition of tapered roller bearings
When expressed according to the series code specified in GB/T 273.1, the
tapered roller bearing's code consists of the basic code and the post-positioned
code.
A.2 Basic code
A.2.1 The basic code for tapered roller bearings consists of three parts: type
code + size series code + inner diameter code.
A.2.2 The type code uses the English letter "T" to indicate tapered roller
bearings.
A.2.3 The size series code consists of three symbols, which are a combination
of angular series, diameter series, width series, such as 2AC. The first symbol
is a number, which is the contact angle series code, indicating the range of
contact angle; the second symbol is an English letter, which is the diameter
series code, indicating the numerical range of the relationship between the
outer diameter and the inner diameter; the third symbol is an English letter,
which is the width series code, indicating the numerical range of the relationship
between the width and height of the single row bearing. The size series code
shall be in accordance with the requirements in GB/T 273.1.
A.2.4 The bearing inner diameter code is represented by three digits in
millimeters of the bearing inner diameter.
Example:
A.3 Post-positioned code
Inner diameter code, bearing's
inner diameter 20 mm
Width series code
Diameter series code
Angle series code
Type code, T represents tapered
roller bearing
Size series code
Appendix D
(Normative)
Compilation method of non-standard bearing code
D.1 Scope
This Appendix specifies the method for compiling codes for non-standard size
bearings (hereinafter referred to as non-standard bearings).
This Appendix applies to the bearing inner diameters or bearing outer diameters,
width (height), sizes that do not comply with GB/T 273.1, GB/T 273.2, GB/T
273.3 or the bearing sizes as specified in other relevant standards.
D.2 Code composition
D.2.1 Overview
The code composition of non-standard bearings consists of the basic code and
the pre-positioned and post-positioned codes.
D.2.2 Basic code
The basic code of non-standard bearings consists of two parts: type code and
size indicating the basic size of the bearing.
D.2.2.1 Type code
The type codes of non-standard bearings are in accordance with Table 2.
D.2.2.2 Size indication
There are two ways to indicate non-standard bearing sizes.
D.2.2.2.1 Expressed by size series code and inner diameter code:
a) Two methods for representation of size series code:
1) For non-standard outer diameter or width (height) dimensions, use the
method of comparing standard dimensions or according to the rules of
external dimension extension specified in GB/T 273.2 and GB/T 273.3;
take the closest diameter series or width (height) series; add letters and
numbers after the basic code, see Table D.1.
D.2.2.2.2 Expressed by the characteristic size characterizing the fitting
installation:
The size of the bearing is expressed as: "/inner diameter × outer diameter ×
width (the actual size in millimeters)"
Example: K/13×17×13 - Needle roller and cage assembly, Fw = 13 mm, Ew = 17 mm,
Bc = 13 mm.
D.2.2.3 Other representations
When several non-standard bearings of the same type with little difference in
external dimensions have the same code, use the symbol "-" and the sequence
number 1, 2, 3... to distinguish after the code.
Example 1: 61700X1-1
Example 2: 61700X1-2
Example 3: 52706-1
Example 4: 52706-2
D.2.3 Pre-positioned code
The pre-positioned code is in accordance with this standard.
D.2.4 Post-positioned code
The post-positioned code is in accordance with the provisions of this standard.
D.3 Other representations
D.3.1 When the user has special requirements for the bearing code, it can be
decided through consultation with the manufacturer.
D.3.2 Special structure non-standard size bearings and bearing code that
cannot use the methods as specified in this Appendix can be as specified by
the manufacturer, but the pre-positioned code shall be added to show the
difference.
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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