Deep Groove Ball Bearing
MR128ZZ miniature ball bearing, constructed from high-hardness metal material, features dual-sided metal seals (ZZ) and is internally pre-filled with grease. It offers compact dimensions, smooth operation, excellent dust resistance, and low noise levels. Ideal for rotating components in small devices such as toy motors, miniature fans, and precision instruments.
Product name：MR128ZZ
Size：8x12x3.5 mm
Material：Gcr15 chrome steel
Weight：0.001 KG
Specification
MR128ZZ is a high-performance miniature deep-groove ball bearing, ideal for precision devices. Its dimensions are 8mm (inner diameter),
12mm (outer diameter), and 3.5mm (thickness), fitting tight spaces perfectly.
Technical parameter:
| Model Number | MR128ZZ |
| Size | 8x12x3.5 mm |
| Weight | 0.001 KG |
| Material | Gcr15 chrome steel |
| Clearance | C2 C0 C3 C4 |
| Precision Grade | p0 |
| Dynamic Load Rating | 545 lbf |
| Static Load Rating | 274 lbf |
| Max Speed (Grease Lubrication) | 48000 RPM |
| Shield Type | ZZ |
| Lubrication | Pre-lubricated with High-Performance Grease |
| Temperature Range | -20°C to +120°C |
| Lead Time | 3-5 Days |
Made from premium GCr15 bearing steel with a metal dust cover, it resists contaminants, boosting durability. It handles 462N
dynamic load and 219N static load,reaching 40,000rpm (grease-lubricated) or 48,000rpm (oil-lubricated). Operating in -30°C
to110°C, it suits diverse environments.
With ABEC-1 precision, it runs stably and quietly. Widely used in electronics manufacturing, reducers, and welders, it
offers reliablesupport at great value, making it a top choice for precision machinery.
Related Products
| Model No. | d | D | H | m |
| MR63-2Z | 3 mm | 6 mm | 2.5 mm | 0.28 g |
| MR83-2Z | 3mm | 8 mm | 3mm | 0.67 g |
| MR74-2Z | 4 mm | 7 mm | 2.5mm | 0.33 g |
| MR84-2Z | 4 mm | 8mm | 3 mm | 0.54g |
| MR104-2Z | 4 mm | 10 mm | 4 mm | 1.33 g |
| MR85-2Z | 5 mm | 8mm | 2.5mm | 0.34 g |
| MR95-2Z | 5mm | 9 mm | 3 mm | 0.58g |
| MR105-2Z | 5 mm | 10mm | 4 mm | 1.26 g |
| MR115-2Z | 5mm | 11 mm | 4 mm | 0.81g |
| MR106-2Z | 6 mm | 10mm | 3mm | 0.7g |
| MR126-2Z | 6 mm | 12 mm | 4 mm | 1.66 g |
| MR117-2Z | 7 mm | 11 mm | 3 mm | 0.71g |
| MR128-2Z | 8 mm | 12 mm | 3.5mm | 0.99 g |
Main uses
It supports small motors, electronic devices (gimbals), packaging/agricultural machinery, and transmission shafts via radial/axial load resistance. Its precision enhances instruments, medical devices, automotive gearboxes, yo-yos, and roller skates with reliable rotation.
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