We were
discussing in our previous post about the various articles in relation with
bearings as mentioned below, and now we have complete understanding with basics
of bearings and other terminologies.
Now we will try
to explain here the bearing number. First let us see list of topics that we
have discussed earlier.
Now we will try
to explain the bearing number here. First let us see quite important points,
when we try to understand a bearing.
Let we have a
bearing, first number will indicate the type of bearing.
Bearing number starts with 1
Bearing number
starts with 1, indicates self aligning ball bearings. Bearing number 1201 is an
example of self aligning ball bearing.
Bearing number starts with 2
Bearing number
starts with 2, indicates barrel and spherical roller bearings. Such Bearings
will have roller of barrel shaped. Barrel and spherical roller bearings
are also self aligning bearings suitable for heavy radial loading.
Bearing number 22326 CC3 is an example of barrel and spherical roller bearing.
Bearing number starts with 3
Bearing number
starts with 3, indicates tapered roller bearings. Such Bearings are usually
used for bearing high axial load and radial load also. 31308 bearing number is
an example of tapered roller bearing.
Bearing number starts with 4
Bearing number
starts with 4, indicates deep grove double row ball bearings. Bearing number
4203 ATN9 is an example of deep grove double row ball bearing.
Bearing number starts with 5
Bearing number
starts with 5, indicates axial deep grove ball bearings or thrust bearings.
Such bearings are basically designed for heavy axial load or thrust load.
Bearing number 51200 is an example of axial deep grove ball bearings or thrust
bearings.
Bearing number starts with 6
Bearing number
starts with 6, indicates deep grove ball bearings. Bearing number 6207 is an
example of deep grove ball bearings.
Bearing number starts with 7
Bearing number
starts with 7, indicates single row angular contact ball bearings. Bearing
number 7312 is an example of single row angular contact ball bearings.
Bearing number starts with 8
Bearing number
starts with 8, indicates axial cylindrical roller bearings. Bearing number
81212-TV is an example of axial cylindrical roller bearings.
Bearing number starts with NA
Bearing number
starts with NA, indicates needle roller bearings. Bearing number NA4906-2RS is
an example of needle roller bearings.
Suffix of a bearing number
Bearing number
will be associated usually with suffix and their importance could be seen
below.
RS term
RS term is
normally used to indicate ball bearings with seals. RS stands here for rubber seal
and this seal will be usually made by rubber, non-synthetic or synthetic
materials.
Let us see one
bearing who’s bearing number is 6206 RS, this bearing will have seal on one
side only. RS indicates that bearing will have seal on one side only.
If we have
another bearing which number is 6206 2RS, in this case bearing will have seal
on both sides. 2RS indicates that bearing will have seal on both side i.e. on
left hand and right hand.
Z term
Z term is
normally used to indicate ball bearings with shield. Z stands here for metal
shield.
Let us see one
bearing who’s bearing number is 6206 Z, this bearing will have shield on one
side only. Z indicates that bearing will have shield on one side only.
If we have
another bearing whose bearing number is 6206 ZZ, in this case bearing will have
shield on both sides. ZZ indicates that bearing will have shields on both sides
i.e. on left hand side and right hand side also.
K term
K term
indicates bearing with taper bore
E term
E term
indicates bearing with reinforced design
P2 term
P2 term
indicates bearing with highest precision
There are few
more letters as mentioned here with their importance
NR: Snap ring
and groove
V: Single non
contact seal
VV: Double non
contact seal
DDU: Double
contact seal
Prefix of a bearing number
Bearing number
will be associated usually with Prefix and their importance could be seen
below.
X: Corrosion
resisting steel, such as X623
K: Cage with
roller elements
R: Ring with roller
set
L: Removable
bearing ring
E2: Energy
efficient bearing (SKF)
T: Case
hardened steel, such as T32248
Bearing
manufacturers also use their own prefix and that could be seen in bearing
maintenance manuals of respective manufacturers.
Bearing bore diameter
Bearing bore
diameter could be calculated by considering the last two digits of bearing
number.
If bearing last
two digits are 00, it indicates bearing bore diameter d = 10 mm. For example
bearing 1200, will have bore diameter 10 mm.
If bearing last
two digits are 01, it indicates bearing bore diameter d = 12 mm. For example
bearing 51101A, will have bore diameter 12 mm.
If bearing last
two digits are 02, it indicates bearing bore diameter d = 15 mm. For example
bearing 3202, will have bore diameter 15 mm.
If bearing last
two digits are 03, it indicates bearing bore diameter d = 17 mm. For example
bearing 6303, will have bore diameter 17 mm.
Internal Clearances
A bearing
number will have one clearance series. Bearing number usually comes with C1,
C2, C3, C4 or C5. If bearing number is not mentioned with clearance series that
means bearing will have normal clearance. For example bearing 6226 indicates
that bearing has normal clearance.
C2: Clearance
less than normal clearance
C1: Clearance
less than C2 clearance
C3: Clearance
more than normal clearance
C4: Clearance
more than C3 clearance
C5: Clearance
more than C4 clearance
Let us consider one example of a bearing number and discuss its importance
Let we have one
bearing with number 23215 C3
2: barrel and
spherical roller bearings
3 and 2:
Bearing construction details (size of the bearing)
15: Bearing
bore diameter will be 75 mm
C3: Bearing
internal clearance more than normal clearance
Similarly, we
can understand the importance of a bearing number.
We will
discuss Boyle’s law and Charles law in our next post.
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