What does ZZ mean on a 6303 bearing?

Q: What does ZZ mean on a 6303 bearing?

Short answer: `ZZ` on a 6303 means metal shield on both sides (non-contact, lower drag, less sealing). The boundary dimensions stay 17 × 47 × 14 mm. Suffixes are not interchangeable: the same size with a different suffix behaves differently under load, heat or contamination.

Question

Accepted Answer

Short answer: `ZZ` on a 6303 means metal shield on both sides (non-contact, lower drag, less sealing). The boundary dimensions stay 17 × 47 × 14 mm.

Suffixes are not interchangeable: the same size with a different suffix behaves differently under load, heat or contamination.