684 Bearing
Deep groove ball bearing
- Bore d4 mm
- Outer dia. D9 mm
- Width B2.5 mm
- Weight≈ 0.7 g
High-speed applications such as electric motors, pumps, fans and gear reducers.
Technical data
| Bearing designation | 684 |
|---|---|
| Type | Deep groove ball bearing |
| Bore d | 4 mm |
| Outer dia. D | 9 mm |
| Width B | 2.5 mm |
| Weight | ≈ 0.7 g |
Dimensions are standard catalogue values; the weight is an approximate calculation. Please confirm before ordering.
Common suffixes for 684
| 684 | Standard design (open, normal clearance) |
|---|---|
| 684-2RS | Rubber seals on both sides (sealed), greased |
| 684-ZZ | Metal shields on both sides (dust shields) |
Click a designation to open it in the bearing finder. Suffix usage can differ slightly between brands.
Matching seal (radial shaft seal)
4 × 9 × 7 mm
Seal weight: ≈ 1 g
Other common widths: 4 × 9 × 10 mm
The seal's inner diameter matches the shaft (4 mm) and its outer diameter matches the housing bore (9 mm); the width depends on the space in the housing. NBR (double lip, TC type) is recommended for general use and FKM (Viton) for high temperatures.
Quote for bearing and seal