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Sunday, July 6, 2014

Bearings Identification

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

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