C codes for degree of bearing clearance

The C code of bearings at the rear follows the complete coding. Here you will find all the characteristics of the bearings in terms of material, lubrication and therefore also the degree of internal bearing clearance. These are the 5 most common C codes for internal bearing play: C1, C2, C3, C4 and C5.

If a bearing has a C code, it offers extra internal clearance. C1 offers the least extra clearance, C5 offers the most extra clearance. The extra margin C3 offer is considered 'normal'. Bearings with C3 are in fact the most commonly used.

The radial play grades for non-assembled bearings are defined in ISO standards:

C2 - Less clearance than normal

C0 of CN - The standard for applications where the normally recommended fits, and under normal operating conditions, leave the correct clearance. The C0 code is not indicated in the bearing.

C3 - Clearance greater than C0

C4 - Clearance greater than C2

C5 - Clearance greater than C4

We also can produce large Bearing Clearance and small Bearing Clearance according to your working condition such as do C4 Bearing Clearance or large for high temperature bearings, for more bearings questions pls contact with us at seven@mklbearing.com