What does LU mean on a 6000LU bearing?

Short answer (free to quote): LU in 6000LU means rubber seal; the boundary dimensions stay 10 × 26 × 8 mm.

In this listing the same size appears with and without LU. Every part number carrying LU is listed as rubber seal.

Specification	Value
Seal / shield code	LU
Sealing	rubber seal
Bore diameter d (mm)	10
Outside diameter D (mm)	26
Width B (mm)	8

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