EZO MR93-ZZ Shielded MR Series Miniature Ball Bearing 3 x 9 x 4 mm

This EZO range covers 16 MR series metric miniature single row deep groove ball bearings, shielded (ZZ), from 3 to 8 mm bore, with outer diameters of 6 to 16 mm and widths of 2.5 to 6 mm. Select the size from the drop-down: each size has its own bearing number and dimensions in the Model Details.

Deep groove bearings are the most widely used ball bearing type. They carry radial loads and axial loads in both directions, run at high speed and need no adjustment. The two pressed steel shields (ZZ) hold the grease in and keep larger particles out without adding seal friction.

Where this product is used

• Small electric motors, fans and appliances
• Power tools, 3D printers and hobby models
• Office equipment, instruments and light automation

Features

• Two pressed steel shields (ZZ) hold the grease in and keep larger particles out without touching the inner ring, so friction stays low and speed capability high
• Basic dynamic load ratings 0.21 to 0.82 kN and static load ratings 0.07 to 0.39 kN across the sizes with published ratings

Key specifications

Available sizes

Load ratings and speeds are not published for the MR166-ZZ.

Selecting the right option

Pressed steel shields (ZZ) retain the grease and keep larger particles out without touching the inner ring, so friction stays low and speed capability high. A shield is not a seal: fine dust and moisture can still enter, so choose 2RS where dust, splashes or damp are present.

Fitting and use

Check the load and speed against the figures for your size before ordering and apply a suitable safety factor. Deep groove bearings must always carry a minimum radial load so the balls roll rather than slide, and heavy axial loads should be checked with AIMS before ordering.

Press on the ring that is being fitted, not the other ring or the balls: force goes through the side face of the inner ring on a shaft and through the outer ring in a housing.

Shielded bearings are lubricated at the factory and built for inner ring rotation. Do not wash them or heat them before mounting, and do not rely on them for high speed outer ring rotation.