EZO 693-2RSC3 Sealed Miniature C3 Ball Bearing 3 x 8 x 4 mm

This EZO range covers 7 miniature single row deep groove ball bearings, sealed (2RS), all with C3 radial internal clearance, from 3 to 9 mm bore, with outer diameters of 8 to 20 mm and widths of 4 to 6 mm. Select the size from the drop-down: each size has its own bearing number and dimensions, load ratings and limiting speed 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 contact rubber seals (2RS) hold the grease in and keep dust and splashes out. C3 radial internal clearance is larger than Normal, which suits interference fits and bearings that run warm.

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 contact rubber seals (2RS) of nitrile rubber (NBR) hold the factory grease in and keep dust, dirt and splashes out
• C3 radial internal clearance, larger than Normal, which suits interference fits and temperature differences between the rings
• Basic dynamic load ratings 0.56 to 2.47 kN and static load ratings 0.18 to 1.08 kN across the range

Key specifications

Available sizes

Limiting speed is the grease rating for the size; contact seals reduce it.

Selecting the right option

Contact rubber seals (2RS) give better protection against dust, dirt and splashes than shields and hold the factory grease in. The seal lips add friction, so a sealed bearing runs slower than an open or shielded bearing of the same size, and a high speed application is better served by an open or shielded bearing.

C3 radial internal clearance is larger than Normal (CN). Choose C3 where the bearing will run with an interference fit on the shaft or in the housing, or where the inner ring will run warmer than the outer ring, because both take up clearance. Keep Normal clearance for light fits, low temperature rise and quiet running.

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.

Sealed 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.

Related products

Also available from EZO: the same C3 690 series range with metal shields (ZZ) and stainless steel bearings in the 690 series.