684ZZ Metric Miniature Ball Bearing is a Precision Radial Miniature Ball Bearing with Both Sides Metal Shielded and pre-lubricated with Grease or Oil.
Sizes: ID 4mm x OD 9mm x W 4mm
Used in: DC Motors, 3D Printers, Fidget Spinner, Roller Blades, Skateboard, Inline Skating, Fan, Blower, Power Tools, Bend Saw, Hand Piece, Hobby, RC Helicopters, RC Planes, RC Trucks, RC Cars, Beam Ball Bearing and many more.
684ZZ Metric Miniature Ball Bearing is a 4mm ball bearing that is found in many applications. 684ZZ Metric Miniature Ball Bearing has two non-contact metal shields one on each side of the ball bearing. If your application requires a 684ZZ ball bearing with only one shield you can get this ball bearing and take one of the shields off. This 9mm ball bearing 684ZZ is high quality and can take electric motor demands if needed.
Rolling ball bearings use rolling elements to maintain the separation between moving parts to reduce rotational friction and support radial and axial loads. These elements can be one of the following types: ball, cylindrical, spherical, barrel, needle, spindle, or tapered. All rolling bearings are open, shielded, or sealed. Sealed bearings are lubricated with oil or grease in the bearing factory, while open and shielded bearings are meant to be lubricated in place, with periodic reapplication of lubrication, based on use. The shield protects the working parts of the bearing from environmental debris that may be introduced and could reduce the ball bearing speed and lifespan. Rolling bearings are used in a range of applications from agricultural machinery to conveying equipment, robotics, dental equipment, elevators, rolling mills, ship rudder shafts, and aggregate crushers, among others.
| Bearing Type | Ball |
| For Load Direction | Radial |
| Construction | Single Row |
| Seal Type | Shielded |
| Part Number | 684ZZ |
| For Shaft Diameter | 4mm |
| Bore Dia (d) | 4mm |
| Bore Dia Tolerance | -0.008mm to 0 |
| For Housing ID | 9mm |
| Outer Dia (D) | 9mm |
| Outer Dia Tolerance | -0.008mm to 0 |
| Width (B) | 4mm |
| Width Tolerance | -0.12mm to 0 |
| Ring Material | 52100 Chrome steel |
| Ball Material | 52100 Chrome steel |
| Cage Material | 300 Series Stainless Steel |
| Shield Material | 300 Series Stainless Steel |
| Dynamic Load Rating (Cr) (Newtons) | 545 |
| Static Load Rating (Cor) (Newtons) | 182 |
| Max Speed (Grease) (X1000 RPM) | 53 |
| Max Speed (Oil) (X1000 RPM) | 75 |
| Lubrication | Required |
| Shaft Mount Type | Press Fit |
| Temperature Range | -30° to 110 °C |
| ABEC Rating | ABEC-1 |
| Radial Clearance Trade No. | C0 |
| Radial Clearance | 0.002mm to 0.013mm |
| RoHS | Compliant |
| Ball Qty | 7 |
| Ball Dia | 1.5880mm |
| Weight (grams) | 1 |
1 Applicable only for open, single Z, ZZ, single RU and 2RU types in inner ring rotating conditions. Max. speeds for the contact rubber seal(s) types will be around 50-60 % of above values.
2 Applicable only for open, single Z, ZZ, single RU and 2RU types in inner ring rotating conditions. Max. speeds for the contact rubber seal(s) types will be around 50-60 % of above values.
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