Short answer: `63` = deep-groove ball bearing, `0` = light dimension series, `2` = bore code → 15 mm bore.

Bore rule: 00 → 10 mm, 01 → 12 mm, 02 → 15 mm, 03 → 17 mm, 04 and above × 5 = bore in mm. Here 2 × 5 = 15 mm.