Manufactured by CHG Bearing, the 628 is a precision Metric Miniature Deep Groove Ball Bearings. Key dimensional parameters include a 8 mm bore diameter, a 24 mm outer diameter, and a 8 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.
628 - Metric Miniature Deep Groove Ball Bearings
Technical Specifications
| Overview | |
|---|---|
| Part Number | 628 |
| Dimensions | |
| Bore Diameter (d) | 8 mm |
| Width (B) | 8 mm |
| Outer Diameter (D) | 24 mm |
| Open Width B | 8 mm |
| Radius rs min | 0.3 mm |
| Closed Width B1 | 8 mm |
| Performance | |
| Dynamic Load Cr (N) | 3333 N |
| Static Load C0r (N) | 1423 N |
| Grease Speed (x1000 rpm) | 28 x1000 rpm |
| Oil Speed (x1000 rpm) | 34 x1000 rpm |
| Design Configurations | |
| Open Model | 628 |
| Flanged Open Model | - |
| Shielded Model | 628ZZ |
| Flanged Shielded Model | - |
| 2RS | 2RS |
| 2RU | 2RU |
| TTS | - |
| Internal Design & Weight | |
| Cage Type | J |
| Ball Qty. Z | 7 |
| Ball Size Dw | 3.969 mm |
| Shielded Weight (g) | 18.5 g |
| Open Weight (g) | 17.1 g |
628 24 mm 8 mm 8 mm Frequently Asked Questions about 628 Metric Miniature Deep Groove Ball Bearings
Find key technical answers regarding dimensions, specifications, and replacement options for this model.
Engineered according to international ISO boundary plans, CHG Bearing supplies 628 with a precision bore diameter (d) of 8 mm, an outside diameter (D) of 24 mm, and a nominal ring width (B) of 8 mm. This configuration yields an effective cross-sectional wall thickness of 8.0 mm and an envelope ratio (D/d) of 3.0, delivering compact rigidity for OEM machinery housings.
Model 628 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.
The CHG Bearing 628 is rated for limiting speeds up to standard rated RPM under forced oil-mist or circulating oil lubrication regimes. When lubricated with factory-filled synthetic high-speed grease, safe continuous velocity is maintained at approximately 75% to 85% of the maximum nominal limit, preventing thermal runaway.
To safeguard CHG Bearing 628 against fretting wear and false brinelling during transport or vibration, assemble mating surfaces (8 mm x 24 mm) using anti-fretting mounting paste. Maintaining strict alignment and avoiding prolonged static vibration will preserve raceway polish.
