# Where are C3 bearings used?

## Where are C3 bearings used?

C3 is designed for hot running environments; engines etc. where the bearing temp could reach 100deg or more. C4 more extreme temperature applications and higher speed environments. C5 the highest clearance bearing available, are extremely loose to start and can knock until at operating speeds and temperature.

What is standard clearance on a bearing?

Bearing internal clearance (fig. 1) is defined as the total distance through which one bearing ring can be moved relative to the other in the radial direction (radial internal clearance) or in the axial direction (axial internal clearance).

How much clearance do you need between bearing and shaft?

For most applications . 00075 to . 0010” (three quarters to one thousandth of an inch) of clearance per inch of shaft diameter is a reasonable starting point.

### How do you calculate bearing clearance?

The commonly accepted rule that most crankshaft manufacturers prefer for street and performance engines is 0.0010-inch for every 1-inch of journal diameter. So for a 2.45-inch small-block main journal, the bearing clearance would be 0.0024-inch.

What is C5 clearance?

C codes for degree of bearing clearance 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’.

What is the meaning of ZZ in bearing?

2 Z / ZZ – Bearing with a metal seal on both sides. Z – Bearing with a metal seal on one side, one side open.

Radial internal clearance is defined as the total distance that one ring can be moved, relative of the other ring or basically the amount of “play” in the bearing. In spherical roller bearings this can be measured using a feeler cage between the roller and the outer ring raceway surface.

How do you check bearing clearance?

For these reasons, bearing clearances are specified as “vertical clearance” and must be measured at 90 degrees to the split line. The best method of measurement is with a dial bore gage that measures the bearing inside iameter when the bearings are installed at the specified torque without the shaft in place.

What does bearing suffix C3 clearance mean?

C3 means the bearing has more clearance than standard. For example we may use C3 clearance on bearings where a cold start up application my cause the balls to heat up quickly, the heat needs to go somewhere.

### What does C3 bearing mean?

“C3 bearings are bearings that have an additional internal radial clearance to cope with high speed environments where excess heat is generated. They are not suited to environments where critical alignment is required from the onset e.g. Where blades and cutters are set up to each other.