Bearing 628 ZZ – sealed deep groove ball bearing, single-row, metal shields (ZZ)

628 ZZ is a single-row deep groove ball bearing with metal shields on both sides (ZZ). It is designed to support radial loads and enable smooth rotary motion in compact assemblies. The sealed metal shields provide protection against moderate contamination while maintaining low friction and compact dimensions that suit standard shaft fits and limited-space housings.

Advantages

The sealed design reduces ingress of dust and debris without significantly increasing rolling resistance, extending service life in typical operating environments. Its single-row deep groove geometry allows for reliable radial load capacity and stable rotation at a range of speeds. The metal shields (ZZ) are thin and durable, offering consistent protection while preserving the bearing’s small overall profile for easy installation in confined spaces.

Suitable for

• Electric motors and small appliances
• Gearboxes and reduction drives
• Cooling fans and blowers
• General machinery and rotating shafts in constrained housings
• Light industrial equipment requiring sealed bearings

Key specifications

• Type: single-row deep groove ball bearing
• Shielding: metal shields on both sides (ZZ)
• Function: supports radial loads and enables rotary motion
• Design: compact, suitable for limited-space installations
• Friction: low rolling resistance suitable for moderate-speed applications
• Protection level: sealed against moderate contamination (not fully dust-tight or waterproof)

How to use

Install the bearing on a correctly sized and clean shaft using appropriate pressing tools or a sleeve to apply force to the correct race. Ensure housing and shaft fits meet the bearing’s tolerance requirements and that mating surfaces are free of burrs and corrosion. Apply lubricant if the bearing is not factory-filled to the required specification, and avoid exceeding recommended interference fits or misalignment during assembly. Check for smooth rotation by hand before full operation and perform initial run-in at moderate speed under supervision.

Usage recommendations

Use the 628 ZZ in applications where moderate environmental protection is sufficient; avoid continuous exposure to heavy contamination, water immersion, or corrosive atmospheres. Select appropriate lubrication intervals based on operating speed, load, and ambient conditions, and replace the bearing if shields are damaged or rotation becomes noisy or rough.