F6300 to F6702 2Z (ZZ) Bearing Steel Micro Double Shielded Flange Ball Bearings

Match the bearing's inner diameter (ID) to your shaft diameter. For example, if your shaft is 15 mm, select F6702 (15×21×4 mm) from the thin series or F6302 (15×42×13 mm) from the standard-depth series depending on your available housing depth. Always verify the housing bore matches the bearing OD and that the flange recess accommodates the flange outer diameter.

The F6700–F6702 sub-series are ultra-thin flat-flange bearings with a thickness of only 4 mm, designed for space-constrained assemblies where axial depth is critical. The F6300–F6306 sub-series are standard-depth flanged bearings with greater load capacity and thicker cross-sections (11–19 mm), suited for applications requiring higher radial and axial load ratings.

2Z indicates that both sides of the bearing are fitted with non-contact pressed-steel shields. These shields retain the factory grease and block dust and light particulate from entering the bearing cavity. Unlike rubber contact seals (2RS), steel shields do not touch the inner ring, resulting in lower friction and higher permissible speeds, at the cost of slightly less sealing effectiveness against fine dust or liquid splash.

These bearings are made from standard bearing steel, which is not inherently stainless. They are suitable for dry to moderately dusty environments. For applications involving water exposure, high humidity, or chemical contact, consider stainless steel flanged bearings instead. Applying a compatible bearing grease or corrosion inhibitor can extend service life in mildly humid conditions.

Yes. The 2Z steel shield configuration and pre-applied grease make these bearings suitable for moderate-speed motor end-cap and spindle applications. Maximum permissible speed varies by model size — larger bearings (e.g., F6306) have lower speed limits than smaller ones (e.g., F6700). Contact us to confirm speed ratings for your specific model if operating near the upper speed range.

Press or slide the bearing into the housing bore until the flange seats flush against the housing face. Apply force only to the outer ring when pressing into the housing — never press through the balls or inner ring. For shaft installation, apply force to the inner ring only. Use a bearing press or a correctly sized sleeve to avoid cocking the bearing during installation. Do not hammer directly on the shield face.

For prototyping or single-machine repair, the 1-piece option lets you validate fit and performance before committing to stock. For small production runs or maintenance kits, the 3- or 5-piece packs offer a lower per-unit cost. The 10-piece pack provides the best per-unit value and is recommended for ongoing production or when maintaining a spare-parts inventory for multiple machines.