Self-Aligning Ball Bearing Helicopter RC Nitro Z Pack Price R188 zz nbc Bearings 1/4" x 1/2" x 3/16" R188ZZ Shielded Miniature Ball Bearing, this is a popular size that could be used in many applications, the inner diameter is 1/4" inch, outer diameter is 1/2" inch and the width is 3/16" inch, each bearing has 2 metal shields to protect the bearing from dust or any possible contamination, also bearing is pre-lubricated with grease.
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 ball 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 | R188ZZ |
| For Shaft Diameter | 0.25" |
| Bore Dia (d) | 0.25" |
| Bore Dia Tolerance | -0.0003" to 0 |
| For Housing ID | 0.5000" |
| Outer Dia (D) | 0.5000" |
| Outer Dia Tolerance | -0.0003" to 0 |
| Width (B) | 0.1875" |
| Width Tolerance | -0.0.05" 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) | 207 lbf |
| Static Load Rating (Cor) (Newtons) | 80 lbf |
| Max Speed (Grease) (X1000 RPM) | 40 |
| Max Speed (Oil) (X1000 RPM) | 67 |
| Lubrication | Required |
| Shaft Mount Type | Press Fit |
| Temperature Range | -30° to 110 °C |
| ABEC Rating | ABEC-1 |
| Radial Clearance Trade No. | C0 |
| Radial Clearance | 0.00008" to 0.0005" |
| RoHS | Compliant |
| Ball Qty | 8 |
| Ball Dia | 0.07870" |
| Weight (grams) | 2.32 |
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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