6304ZZ bearing
The 6304ZZ is a deep groove ball bearing with a 20 mm bore, 52 mm outside diameter and 15 mm width, metal shielded on both sides.
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 | ZZ: metal shielded on both sides |
Cross reference: same bearing, other brands
| SKF | 6304-2Z |
|---|---|
| NTN | 6304ZZ |
| NSK | 6304ZZ |
| FAG | 6304-2ZR |
| Timken | 6304-ZZ |
| Koyo | 6304ZZ |
Budget brands usually sell this as 6304ZZ. Add C3 if your old bearing was stamped C3 (looser fit for hot-running motors).
Where to buy
Other versions
Other bearings with a 20 mm bore
Questions
What size is a 6304ZZ bearing?
20 × 52 × 15 mm (bore × outside diameter × width).
What does ZZ mean?
ZZ means metal shields on both sides. Shields have less drag than rubber seals and suit higher speeds, but they don't keep out water or fine dust as well.