Manufactured by CHG Bearing, the MR128 is a precision Metric Miniature Deep Groove Ball Bearings. Key dimensional parameters include a 8 mm bore diameter, a 12 mm outer diameter, and a 2.5 mm overall width. This component is designed to meet standard load requirements and ensure consistent operational performance. For comprehensive technical evaluation, please explore the detailed specifications, dimensional data, product images, and CAD drawings provided below. A complete PDF data sheet is also readily available for direct download to support your engineering and procurement needs.
MR128 - Metric Miniature Deep Groove Ball Bearings
Technical Specifications
| Overview | |
|---|---|
| Part Number | MR128 |
| Dimensions | |
| Bore Diameter (d) | 8 mm |
| Width (B) | 2.5 mm |
| Outer Diameter (D) | 12 mm |
| Open Width B | 2.5 mm |
| Radius rs min | 0.1 mm |
| Flange Df | 13.2 mm |
| Closed Width B1 | 3.5 mm |
| Open Flange Width Bf | 0.6 mm |
| Closed Flange Width Bf1 | 0.8 mm |
| Performance | |
| Dynamic Load Cr (N) | 543 N |
| Static Load C0r (N) | 274 N |
| Grease Speed (x1000 rpm) | 40 x1000 rpm |
| Oil Speed (x1000 rpm) | 48 x1000 rpm |
| Design Configurations | |
| Open Model | MR128 |
| Flanged Open Model | MF128 |
| Shielded Model | MR128ZZ |
| Flanged Shielded Model | MF128ZZ |
| 2RS | - |
| 2RU | - |
| TTS | TTS |
| Internal Design & Weight | |
| Cage Type | W |
| Ball Qty. Z | 12 |
| Ball Size Dw | 1.2 mm |
| Shielded Weight (g) | 0.99 g |
| Flanged Shielded Weight (g) | 1.14 g |
| Open Weight (g) | 0.7 g |
| Flanged Open Weight (g) | 0.81 g |
MR128 12 mm 8 mm 2.5 mm Frequently Asked Questions about MR128 Metric Miniature Deep Groove Ball Bearings
Find key technical answers regarding dimensions, specifications, and replacement options for this model.
Built for demanding industrial environments, the MR128 Metric Miniature Deep Groove Ball Bearings by CHG Bearing boasts a dynamic load rating (Cr) of standard dynamic and a static load threshold (C0r) of standard static. The optimized internal raceway geometry balances stress distribution, mitigating edge loading even when operating under peak mechanical stresses.
As a primary manufacturer, CHG Bearing supports both trial batch evaluations and container-load supply for MR128. Standard catalog sizes are stocked for rapid 3–7 day dispatch, while high-volume OEM production runs typically dispatch within 30–45 days.
Model MR128 is manufactured by CHG Bearing in standard Normal clearance (CN) for ambient temperature transmission, and C3 or C4 clearance for heavy duty applications. C3 clearance compensates for radial shrinkage caused by tight shaft press-fits (bore 8 mm) and steep thermal gradients between inner and outer rings.
Absolutely. The CHG Bearing MR128 Metric Miniature Deep Groove Ball Bearings is a 1:1 direct interchange for renowned brands, matching part numbers: SKF MR128, FAG MR128, NSK MR128. It shares identical envelope boundary dimensions, load capacities, and shaft fits, allowing instant drop-in replacement without retrofitting your machinery.
