Deep Groove Ball Bearings FAG 6217 -C4

The FAG 6217-C4 deep-groove ball bearing, with an 85 mm bore and increased C4 clearance, offers operational reliability under severe thermal conditions.

The 6217-C4 deep-groove ball bearing is a single-row rolling bearing made from standard bearing steel, designed primarily for radial loads. With dimensions of 85 × 150 × 28 mm, this open bearing also accommodates axial forces in both directions. Manufactured to the standard tolerance P0/PN (ABEC 1), it is suitable for industrial machinery where thermal expansion or tight fits occur. As it does not feature integrated sealing washers, the bearing can be integrated directly into existing lubrication circuits.

What is the 6217-C4 deep groove ball bearing suitable for?

This design is suitable for industrial drives subject to thermal stress and rotating assemblies with significant operational heating. Thanks to the combination of an open outer ring without a flange and a sheet steel cage, the bearing operates in oil- or grease-lubricated housings. The permissible temperature range is from -30 to +150 degrees. Its use is particularly recommended where there are thermal differences between the shaft and the housing, as well as in the case of tight fits.

What does the C4 bearing clearance mean for the 6217-C4 deep groove ball bearing?

The designation C4 indicates a significantly increased radial clearance, which is well above the standard and exceeds the C3 grade. This increased clearance compensates for the radial expansion of the shaft at high operating temperatures, as well as for the constriction caused by tight fits. You should specifically select the C4 variant if temperature gradients occur between the inner and outer rings during normal operation. However, at low operating temperatures or with small fit allowances, the increased bearing clearance may result in noticeable play.