Rolling Code to represent the structure, size, tolerance levels, and technical performance characteristics of the rolling bearing products with alphanumeric symbols.
1 Subject and Scope
This standard specifies the Rolling and its sub-components (hereinafter referred to as bearing) of the preparation method of the code.
This standard applies to general-purpose bearings.
2 reference standards
GB/T273.1 rolling bearings tapered roller bearings - Boundary dimensions
GB/T273.2 Rolling bearings - Thrust bearings - Boundary dimensions
GBiT273.3 Rolling bearings bearings - Boundary dimensions
GB/T276 rolling bearing deep groove ball bearings Dimensions
GB/T281 Bearing Self-aligning ball bearings Dimensions
GB/T283 rolling bearings Cylindrical Roller Bearing Dimensions
GB/T285 rolling bearings double row cylindrical roller bearings Dimensions
GB/T288 Rolling Spherical Roller Bearing Dimensions
GB/T290 bearings - Needle roller bearings - Boundary dimensions
GB/T292 radial bearings angular contact ball bearings Dimensions
GB/T294 radial bearings four-point contact ball bearings Dimensions
GB/T296 rolling bearings double row angular contact ball bearings Dimensions
GB/T297 rolling bearings, tapered roller bearings - Boundary dimensions
GB/T301 Rolling flat thrust ball bearings Dimensions
The GB/T3882 spherical ball bearings and the eccentric sleeve Dimensions
The GB/T4221 Rolling micro size to aligning ball bearing diameter series 7 shape
GB/T4605 needle roller bearings thrust needle roller and cage assemblies, thrust washers
GB/T4663 rolling bearing thrust cylindrical roller bearings - Boundary dimensions
The GB/T5801 needle bearing light, dimensions and tolerances in series
The GB/T5846 needle bearing radial needle roller and cage assemblies
The GB/T5859 Rolling Thrust Spherical Roller Bearing Dimensions
Supplementary Provisions JB/T2974 Rolling Code method
The composition of three bearing code
Bearing code of the basic code, pre-code and code, arranged in the figure.
3.1 The basic code
The basic code bearing type, structure and size, is the basis of the bearing code.
The basic code of 3.1.1 Rolling bearings (needle bearings)
Bearing Dimensions in line with GB/T273.1, the dimensions of any standard, GB / T 273.2, GB/T273.3, GB / T-3882, the basic code bearing type code dimension series code, the inner code constitutes .
Type codes in Table 1 (hereinafter referred to as digital) or a capital letter (hereinafter referred to as the letters), dimension series code and inner code numbers with Arabic numerals.
Example: 6204 6 - type code, 2 - dimensional series (02) Code 04 - inner code
N2210N-type code, code 22 - Dimensions Series, 10 - inner code
3.1.1.1 the type of code
Bearing type code numbers or letters in Table 2.
Note: 1.For or former letters or numbers indicate the different structure of the bearings of the class.
3.1.1.2 Size Series Code
Dimension series code is formed by the bearing width (high) degree of series combination of code and diameter series code.
Radial bearings, thrust bearing dimension series code in Table 3.
3.1.1.3 commonly used type of bearings, dimension series code and the code by the bearing type, dimension series code consisting of combinations of code in Table 4.
3.1.1.4 said bearing nominal inside diameter of the inner code in Table 5.
3.1.2 Needle Roller Bearings basic code
3.1.3 Code Rules for the Preparation
Bearing type code using the letters in the basic code, layout should be a series of bearing size code, ID code, or install the empty half of Chinese characters with the characteristic size of the digital distance. Example: NJ230, AXK0821,.
3.2 front, rear Code
Front, rear code is bearing there is a change in structure and shape, dimensions, tolerances, and technical requirements, about the basic code to add supplementary code. Arranged according to Table 8.
3.2.1 Prefix
Prefix letters. Codes and their meanings according to Table 9.
Code set after 3.2.2
Post code) that the letters (or plus the number.
3.2.2.1 Rear Code of the preparation of rules
a. The right of the post code placed in the basic code and distance with the basic code to empty half of Chinese characters (code symbol "a", "/" excluded). Change projects, with multiple groups of post 10 ℃ number listed in order from left to right order, according to Table 8;
and b. Changed to 4 (4) later in their code before the "/" in front of code separated:
Cases :6205-2Z / P6 22308/P63
(c) Change the contents of the two groups, Group 4 in the former group after group code words or numbers said that the meaning may be confusing when the distance between the two code-empty half Chinese characters. Example: 6208/P63V1
3.2.2.2 Rear codes and meanings
(a) internal structure of the code according to Table 10
(b) sealed, dust and external shape change code and the meaning of Table 11.
C. cage structure, material changes and the bearing material to change the code according to the provisions of JB / T 2 974.
(d) Tolerance class code according to Table 12
(e) clearance letter according to Table 13
(f) configuration code according to Table 14
(g)
4 Special notation
4.1 tapered roller bearings
Bearing Dimensions in line with a series of under the GB/T273.1 Appendix A of size, bearing Code Appendix A (reference case), the provisions of this standard.
4.2 Non-standard bearings, inch bearings
Special bearing structure, dimensions do not meet the standard requirements of the bearings and inch size bearing the code, the provisions of the department in charge by the manufacturer.
5 the preparation of regulations
General-purpose bearings should be specified in this standard method for the preparation of bearing code. Subscribers there are special requirements on the code requirements of this standard can be agreed in consultation with the manufacturer.



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