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18 Jan 2012

BEARING NOMENCLATURE

Bearing Nomenclature

You can learn a lot about a bearing just from its part number.
A typical bearing is the 6203ZZ bearing. This part number can be divided into it's
                                                components:6203ZZ
                                                         which means:
                                                        · Type Code
                                                        · Series
                                                        · Bore
                                                        · Suffix
The type code indicates the type of bearing. While each manufacturer uses their own
numbers, there are a few numbers that could be considered standard in the industry.


If the bearing is an inch bearing (the first digit in the number is an R), then the size is the
digit or digits immediately following the R, in 16ths of an inch. An R8-2RS bearing, for
example, has an 8/16th or 1/2 inch bore.
If the first digit is a number, however, it is a metric bearing, and the second digit is the
series, which reflects the robustness of the bearing. The series are, from lightest to
heaviest:
8 Extra thin section
9 Very thin section
0 Extra light
1 Extra light thrust
2 Light
3 Medium
4 Heavy
Yes, they go in that order. Gotta keep things simple, you know.
Each of these series also establishes a relationship between the bore size, outer diameter,
and thickness of the bearing, in accordance with ISO standards. I have no idea what they
are.
The third and fourth digits indicate the bore size in millimeters. Except for 0 through 3,
the bore size is simply five times the third and fourth digits together. 0 through 3,
however, are different:
00 10mm
01 12mm
02 15mm
03 17mm
If there is no fourth digit - for example, a 608 bearing, a common roller skate bearing -
then the size is the last digit in millimeters.
The last letters indicate something special about the bearing. For example:
Z Single shielded
ZZ Double shielded
RS Single sealed
2RS Double sealed
V Single non-contact seal
VV Double non-contact seal
DDU Double contact seals
NR Snap ring and groove
M Brass cage
And then there are the completely off-the-wall bearing numbers, like 499502H. I have no
idea what that number is supposed to mean, but it applies to what is basically an R10-
2RS bearing, only a bit thicker and with a groove and snap ring.
Examples
Common Skate Bearings
Number Bore
(mm)
O.D.
(mm)
Width
(mm)
608 8 22 7
627 7 22 7
688 8 16 4
698 8 19 6
All these bearing numbers start with 6, which tells us they're Single-row deep groove ball
bearings. The second digits tell us the robustness of the bearings. The last two, in series 8
and 9, are very thin and lightweight bearings, while the first, in series 0, is an "extra
light" bearing without being abnormally thin. The third bearing, in series 2, is the most
robust of all, being merely "light".
Light vs Heavy Comparison
Consider the following three bearings:
Number Bore
mm
O.D.
mm
Thickness
mm
6010-2RS 50 80 16
6210-2RS 50 90 20
6310-2RS 50 110 27
We can see from the part numbers that they're all 50mm single-row deep groove ball
bearings. However, we can also see that they're each a different series; specifically, Extra
Light, Light, and Medium. Compare the O.D. and thickness of each bearing, and you can
see how the Extra Light bearing (series 0) is the smallest, and the Medium Bearing (series
3) is the largest. The larger bearing can take much more load than the smaller bearing,
though how much depends on the manufacturer and the RPM the bearing is run at.
Number Bore
mm
O.D.
mm
Thickness
mm
6904-2RS 20 37 9
6004-2RS 20 42 12
6204-2RS 20 47 14
6304-2RS 20 52 15
These are all 20mm single-row deep groove ball bearings of different series. The first, of
series 9, is a "very thin section" bearing, meaning it is much thinner than usual - it is only
25% as thick as its O.D., while the others are approximately 30% as thick as their O.D.
Common Bearing Dimensions
Extra Light Bearings
Number Bore
mm
O.D.
mm
Thickness
mm
6000-2RS 10 26 8
6001-2RS 12 28 8
6002-2RS 15 32 9
6003-2RS 17 35 10
6004-2RS 20 42 12
6005-2RS 25 47 12
6006-2RS 30 55 13
6007-2RS 35 62 14
6008-2RS 40 68 15
6009-2RS 45 75 16
6010-2RS 50 80 16
6011-2RS 55 90 18
6012-2RS 60 95 18
6013-2RS 65 100 18
6014-2RS 70 110 20
6015-2RS 75 115 20
Light Bearings
Number Bore
mm
O.D.
mm
Thickness
mm
6200-2RS 10 30 9
6201-2RS 12 32 10
6202-2RS 15 35 11
6203-2RS 17 40 12
6204-2RS 20 47 14
6205-2RS 25 52 15
6206-2RS 30 62 16
6207-2RS 35 72 17
6208-2RS 40 80 18
6209-2RS 45 85 19
6210-2RS 50 90 20
6211-2RS 55 100 21
6212-2RS 60 110 22
6213-2RS 65 120 23
6214-2RS 70 125 24
6215-2RS 75 130 25
6216-2RS 80 140 26
Medium Bearings
Number Bore
mm
O.D.
mm
Thickness
mm
6301-2RS 12 37 12
6302-2RS 15 42 13
6303-2RS 17 47 14
6304-2RS 20 52 15
6305-2RS 25 62 17
6306-2RS 30 72 19
6307-2RS 35 80 21
6308-2RS 40 90 23
6309-2RS 45 100 25
6310-2RS 50 110 27
Inch Bearings
Number Bore
inch
O.D.
inch
Thickness
inch
SR3-2RS 0.1875 0.5000 0.1960
R4-2RS 0.2500 0.6250 0.1960
R4A-2RS 0.2500 0.7500 0.2813
R6-2RS 0.3750 0.8750 0.2813
R8-2RS 0.5000 1.1250 0.3125
R10-2RS 0.6250 1.3750 0.3438
R12-2RS 0.7500 1.6250 0.4375
R14-2RS 0.8750 1.8750 0.5000
R16-2RS 1.0000 2.0000 0.5000
R20-2RS 1.2500 2.2500 0.5000
1601-2RS 0.1875 0.6875 0.3125
1602-2RS 0.2500 0.6875 0.3125
1605-2RS 0.3125 0.9063 0.3125
1603-2RS 0.3125 0.8750 0.3438
1604-2RS 0.3750 0.8750 0.3438
1614-2RS 0.3750 1.1250 0.3750
1606-2RS 0.3750 0.9063 0.3125
1615-2RS 0.4375 1.1250 0.3750
1607-2RS 0.4375 0.9063 0.3125
1620-2RS 0.4375 1.3750 0.4375
1616-2RS 0.5000 1.1250 0.3750
1621-2RS 0.5000 1.3750 0.4375
1633-2RS 0.6250 1.7500 0.5000
1623-2RS 0.6250 1.3750 0.4375
1638-2RS 0.7500 2.0000 0.5625
1630-2RS 0.7500 1.6250 0.5000
1641-2RS 1.0000 2.0000 0.5625
1652-2RS 1.1250 2.5000 0.6250

2 comments:

  1. Bearing had been named in rules .Bearing naming rules in favor of the product in the industry. China supplier have our own rules in china .

    ReplyDelete
  2. Can anyone tell me how to crack coding of 3 digit bearing as 4 or 5 digit bearing is simple.

    ReplyDelete