Chinese bearings market is significantly disorder in its' prices, quality definition and even bearing designations, it seems impossible to have a standard for Chinese bearings. For example, 6310 deep groove ball bearings in Chinese market has its' possible prices ranging from RMB12 to RMB21, which is an extremely big range for a standard product. Tengen Bearing Company, as the professional bearings
supplier find it difficult to meet different needs from different customers. Some are looking for great quality whilst some are seeking for competitive cost; one will not be attracted when they are not offered correctly.
That is why we defined the
bearings quality classifications
as in the chart, so to enable
customers to benchmark Chinese
bearings' quality as how we do.
Tengen Bearing Co., as the
professional bearing supplier in
China, with many years of local
supply chain networks, we aim to
offer the right bearings to the
right customers at the right
price. We classify Chinese
bearings into 3 grades, which
are A, B, and C, as above bar chart shown with respective measured criteria. The above comparison chart is generated based on a test conducted against three units of 6310 deep groove ball bearings made by three different manufacturers, who are in different segments of Chinese bearings market. 6310 deep groove ball bearing is the mostly common type of bearing in local market. From the collected statistics of the test, we carefully analyze and plotted the differences as in the bar chart.
Chinese bearings¡¯ quality is
commonly being misinterpreted by
many. There are thoughts
that lower quality bearings have
lower precision level, and vise
versa. Let¡¯s make an
example from these three normal
class 6310 deep groove ball
bearings, in the result of test,
all readings of Deviation of
mean bore diameter in a single
plane shows the pass figures which are within the range of 0 to -8 μm, as well as other tolerance standards such as Variation of mean bore diameter in a single plane and Deviation of mean outer diameter in a single plane. Regardless which grade the bearing is,
even the lowest grade of
bearings are still meeting to the same tolerance requirements as clearly defined in JIS standard.
In Chinese market, the
quality of bearings is usually
differentiated by its¡¯
manufacturers with relatively
advanced machineries produce
better quality bearings, whilst
lower quality bearings are
produced by smaller factories
with less advanced machineries.
The differences of quality are
greatly relied on the production
engineering. These may
encompass material of bearings,
machines that produce the
bearings, as well as finishing
of material such as heat
treatment that will make a
different in material hardness,
and surface finishing such as
surface roughness that will make
another different in bearings
appearance, you will be able to
differentiate an SKF bearing out
of a Chinese bearing at a
In the chart, life span of
bearings, maximum speed ratings,
maximum load ratings, and its¡¯
weight, are differentiating
themselves one another, rather
than their tolerance level.
Based on these differentiated
criteria and the test we have
conducted, we concluded and
classified Chinese bearings into
Grade A, B, and C. With this comprehensive classification of bearings grading in China, we aim to offer the right bearings to the right customers at the right price.
Note: The above
bar chart is not intended for any other reasons but only for reference, please do not use it for other purpose.
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