6304 bearing
The 6304 is a deep groove ball bearing with a 20 mm bore, 52 mm outside diameter and 15 mm width, open (no seals or shields).
Size & specs
| Type | Deep groove ball bearing, 63 series (heavy) |
|---|---|
| Bore (ID) | 20 mm (0.787 in) |
| Outside diameter (OD) | 52 mm (2.047 in) |
| Width | 15 mm (0.591 in) |
| Seals / shields | Open |
Cross reference: same bearing, other brands
| SKF | 6304 |
|---|---|
| NTN | 6304 |
| NSK | 6304 |
| FAG | 6304 |
| Timken | 6304 |
| Koyo | 6304 |
Budget brands usually sell this as 6304. Add C3 if your old bearing was stamped C3 (looser fit for hot-running motors).
Where to buy
Other bearings with a 20 mm bore
Questions
What size is a 6304 bearing?
20 × 52 × 15 mm (bore × outside diameter × width).
What is an open 6304 bearing?
It has no seals or shields, so it must be lubricated by the machine (oil bath or grease). Choose 2RS or ZZ if the bearing needs to stay clean on its own.