Dear Readers,
This is continuation with my earlier posts of Bearings. Now discuss about the bearings identification
A bearing number has four parts to it which
includes four numbers and a set of letters. Each of the first two numbers stand
for something, the last two designate size. The letters dictate the
variation of the bearing. These letters can also be followed by more letters
designating internal clearance. In detail:
First number (will be a 0-8) designates the
bearing type:
0 = Double row angular contact ball
bearings
1 = Self-aligning ball bearings
2 = Spherical roller bearings, spherical roller thrust bearings
3 = Tapered roller bearings
4 = Double row deep groove ball
bearings
5 = Thrust ball bearings
6 = Single row deep groove ball
bearings
7 = Single row angular contact
ball bearings
8 = Cylindrical roller thrust
bearings
The second number designates the series, or
cross section. This is basically equivalent to the second number of a tire
rating, it's a ratio of the bore to the width of the bearing, which also controls
the O.D. of the bearing. The larger the cross section, the larger the O.D.
of the bearing.
18 = Thin Section, Light
19 = Thin Section, Medium
0 = Very Light
2 = Light
3 = Medium
4 = Heavy
The third number (which is a set of two
numbers) indicates the bore (in mm) of the bearings. All bearings are designated with
metric standards, not inches. Numbers are as follows:
00 = 10 mm
01 = 12 mm
02 = 15 mm
03 = 17 mm
For 20-480mm bore bearings: Last 2 digits x 5
= Bore (mm)
i.e.- if the bearing number was 04 (04 x 5 =
20 mm), 05 (05 x 5 = 25 mm)
The letters after the number indicate the
variation. These change from manufacturer to manufacturer, but here are
some of the common ones:
Plain -- No Shield
Type Z -- One Shield (normally will have metal
shields)
Type 2Z -- Two Shields (one on each side)
Type RS1 -- One Seal (normally the R indicates
rubber)
Type 2RS1 --Two Seals (one on each side)
Prefix and suffix abbreviation will be followed my next post
For More Information about bearings Click Bearings
For More Information about Bearings Designation's Click Here
