GB/T 308.1-2013 PDF English
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB/T 308.1-2013 | English | 125 |
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Rolling bearings -- Balls -- Part 1: Steel balls
| Valid |
| GB/T 308-2002 | English | 519 |
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Rolling bearings -- Steel balls
| Obsolete |
| GB/T 308-1989 | English | 439 |
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Rolling bearings--Steel balls
| Obsolete |
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GB/T 308.1-2013: Rolling bearings -- Balls -- Part 1: Steel balls---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT308.1-2013
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 21.100.20
J 11
Replacing GB/T 308-2002
Rolling bearings – Balls - Part 1.Steel balls
(ISO 3290-1.2008, NEQ)
Issued on. SEPTEMBER 18, 2013
Implemented on. JUNE 01, 2014
Issued by.
General Administration of Quality Supervision, Inspection
and Quarantine of the People’s Republic of China;
Standardization Administration of the People’s Republic of
China.
Table of Contents
Foreword... 3
1 Scope... 5
2 Normative references... 5
3 Terms and definitions... 6
4 Symbols... 10
5 Size... 11
6 Technical requirements... 13
7 Measurement and inspection method... 16
8 Inspection rules... 17
9 Marking... 17
10 Packaging and storing... 18
Annex A (Informative) Illustration of ball gauge and sorting principles. 19
Annex B (Informative) Crush load value for finished ball of high-carbon
chromium steel... 21
Annex C (Informative) Assessment method of roundness error... 23
Annex D (Informative) The comparison of nominal ball diameter and the
rounded nominal diameter... 24
This Part of GB/T 308 specifies the size, technical requirements, marking, measurements,
inspection method, inspection regulation, packaging, and storage of finished steel-balls
used with rolling bearings.
This Part is applicable to steel-balls supporting rolling bearings and commercial
steel-balls.
2 Normative references
The articles contained in the following documents have become part of this document
when they are quoted herein. For the dated documents so quoted, all the modifications
(including all corrections) or revisions made thereafter shall be applicable to this
document.
GB/T 3086-2008 High carbon chromium stainless bearing steels
GB/T 4199-2003 Rolling bearings - Tolerances - Definitions (ISO 1132-1.2000, Rolling
bearings - Tolerances - Part 1.Terms and definitions, MOD)
GB/T 6930-2002 Rolling bearings - Vocabulary (ISO 5593.1997, IDT)
GB/T 7234-2004 Geometrical Product Specifications (GPS) - Measurement of
roundness - Terms, definitions and parameters of roundness
GB/T 7235-2004 Geometrical Product Specifications(GPS) - Methods for the
assessment of departure from roundness - Measurement of variations in radius
GB/T 7811-2007 Rolling bearings - Symbols for quantities (ISO 15241.2001, IDT)
GB/T 8597-2013 Rolling bearings - Rust proof packaging
GB/T 18254-2002 High-carbon chromium bearing steel
GB/T 18579-2001 High-carbon chromium bearing steel wires
GB/T 24606-2009 Rolling bearings - Non-destructive testing - Magnetic particle testing
GB/T 24608-2009 Inspection rules for rolling bearings and commercial parts
JB/T 1255 Specification for heat-treatment of rolling bearing parts made from high
carbon chromium steel
3 Terms and definitions
For the purpose of this document, terms and definitions in GB/T 4199-2003 and GB/T
6930-2002 and the following ones apply.
3.1
Nominal ball diameter
Diameter value which is used for identification of a ball size.
Note. Nominal ball diameters are the standard sizes for ball diameters of all nominal sizes
(standard diameters), which can be rounded with 4 decimal places.
3.2
Single ball diameter
Distance between two parallel planes tangential to actual surface of the ball.
3.3
Mean ball diameter
Arithmetic mean value of the largest single diameter and the smallest single diameter of a
ball.
3.4
Variation of ball diameter
The difference between the largest and smallest of the single diameters of a ball.
[GB/T 6930-2002, definitions 05.04.04]
6 Technical requirements
6.1 Material and heat treatment
The materials listed in table 2 are widely used for steel balls. Steel ball material and heat
treatment shall generally fulfill the standard specified in table 2.If other kinds of material is
used for manufacturing steel balls, the material and heat treatment quality can also be
determined by customer and manufacturer through negotiation.
6.2 Hardness and crush load
The steel ball hardness shall fulfill specification in table 3.The crush load for ball with
diameters of 3mm ~ 50.8mm shall not be less than the value specified in table 3.
6.3 Tolerance grade
According to size tolerance, form tolerance, gauge and surface roughness of
manufacturing, steel ball can be divided into eleven grades as 3, 5, 10, 16, 20, 24, 28, 40,
60, 100, and 200; accuracy is from high to low sequentially.
6.4 Geometrical form and surface quality
The geometrical form and surface quality requirements for steel ball of each tolerance
grade are as follows.
6.5 Sorting tolerance and ball gauge
6.7 Miscellaneous requirements
If there is special requirement for steel ball, it can be determined by customer and
manufacturer through negotiation.
7 Measurement and inspection method
7.1 For measurement of single steel ball diameter Dws and variation of diameter VDws, steel
ball shall be placed between instrument probe and the plane which is vertical to
instrument probe axis. When VDws is measured, steel ball shall be rotated to change the
measured parts. The maximum difference indicated by measurement instrument is VDws.
7.2 Measurement of deviation from spherical form shall be carried out according to the
specification of annex C.
7.6 Residual magnetism measurement shall be carried out according to the specification
of JB/T 6641-2007.
7.7 Appearance quality is usually verified by vision inspection under astigmatism light.
7.8 Crack inspection shall be carried out according to the specification of GB/T
24606-2009.
8 Inspection rules
Inspection rules shall meet the specifications of GB/T 24608-2009.
9.1 Marking content
9.2 Marking method
The content in clause 9.1 shall be marked on ordering list, qualification certificate, and the
places where need; there shall be a blank space between each marking items.
9.3 Marking example
Example 1.GCr15 8.334 38 (or 8.334 4) G 10 +4 (+4.2) GB/T 308.1-2013
It represents high carbon chromium bearing steel ball which complies with GB/T
308.1-2013 with nominal diameter of 8.334 38 mm, tolerance grade of 10, gauge of +4 μm,
and + 4.2 μm deviation of a ball lot from ball dimension.
10 Packaging and storing
10.1 Packaging
After being tested and proved to be qualified, finished steel balls shall be treated against
rust and packaged according to specification of GB/T 8597-2013.
Balls of different size, different tolerance grade, different material and different gauge as
well as subgauge shall be packaged in different containers (boxes); mixed packing is
forbidden.
10.2 Storage
After being treated against rust and packaged, the balls shall be guaranteed that they will
not rust within one year after being delivered from factory under the transportation and
storage conditions as specified by GB/T 8597-2013.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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