Choice between bearing grades P4 and P5: Which is better?

Choice between bearing grades P4 and P5: Which is better?

When choosing a bearing grade, there are significant differences between P4 and P5 bearings in terms of dimensional precision, rotational precision, and surface quality.

The dimensional precision and rotational precision of P4 bearings meet ISO tolerance grade 4. Compared with P5 bearings, P4 has stricter requirements in terms of dimensional requirements, rotational accuracy, surface shape, and surface quality.

Specifically, P4 bearings have smaller dimensional deviations (such as inner diameter, outer diameter, ellipse, etc.), stricter rotational accuracy (such as inner radial runout, outer radial runout, end face to raceway runout, etc.), and stricter requirements in terms of surface roughness, circular deviation, groove deviation, etc. Therefore, if higher precision and performance are required, P5 bearings are a better choice.