The Hirobo HI2500095 comprises two 4 x 11 x 4 mm shielded ball bearings, carrying the #694ZZ shielded designation. As an aftermarket replacement, this pair is intended for compact RC drivetrain parts, rotor-bearing positions and precision hubs where sealed, low-profile bearings are called for.
These components lower friction in rotating systems and help recover smooth operation when existing bearings become rough or develop play. Fit each bearing squarely into its housing and ensure the mating shaft is clean; confirm correct seating by checking for unwanted axial or radial movement after installation.
Inspection advice: shielded bearings offer protection against light contamination but should still be checked periodically and replaced when wear appears. Reference HI2500095 or #694ZZ when ordering replacements to match both size and shield type.
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