# Brad’s Scooters Bearing Information:

A lot of information about bearings can be determined from their part number. Most of the bearings that we sell are deep groove ball bearings, which have a four digit part number sometimes followed by a suffix that indicates the type of seal (if any). The first digit is always a six which defines the type of bearing (deep groove ball bearing) The second digit indicates the series/sizing code and the last two digits can be used to determine the bore/inner diameter.

For example, a common bearing is the 6200-ZZ bearing. This bearing part number can be broken down as follows:

**6200-ZZ:**

6 = type code

2 = series

00 = bore

ZZ = suffix

**Type Codes:**

1 = self-aligning ball bearing

16 = thin section single-row deep groove ball bearing

2 = wide self-aligning ball bearing

22 = self-aligning roller bearing

23 = wide self-aligning roller bearing

3 = double-row angular contact ball bearing

4 = double-row ball bearing

5 = thrust ball bearing

6 = single-row deep groove ball bearing

7 = single-row angular contact bearing

**Series (Identifies the relative weight of the bearing):**

0 = extra light

1 = extra light thrust

2 = light

3 = medium

4 = heavy

**Bore a.k.a. Inner Diameter (in millimeters)**

The bore size is figured by multiplying the sum of the third and fourth digits by 5. *** Please note that there are exceptions to this rule discussed below ***

Example:6004-2RS bearing

Step 1: add the third and fourth digits together (underlined above).

Step 2: multiply the number that you get from Step 1 by 5.

For this example you should get 20, which is the inner diameter of this bearing in millimeters.

*** Exceptions to the rule ***

For numbers 0 through 3 there is no math required.

00 = 10mm bore

01 = 12mm bore

02 = 15mm bore

03 = 17mm bore

**Suffix (Indicates the type of seal)**

Z = single side of bearing is sealed with metal

ZZ = both sides of bearing are sealed with metal

RS = single side of bearing is sealed with rubber

2RS = both sides of bearing are sealed with rubber

*If there is no suffix the bearing is not sealed on either side

**Other Designations**

C3 = This marking indicates a radial internal clearance greater than the standard clearance. C3 bearings are usually fitted to equipment where there are large temperature differences between the inner and outer rings, therefore, sufficient clearance is needed to avoid early bearing failure.

x (following the bore) = indicates a special internal design (e.g. x1, x2, x3)

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