Manufactured by CHG Bearing, the 634 is a precision Metric Miniature Deep Groove Ball Bearings. Key dimensional parameters include a 4 mm bore diameter, a 16 mm outer diameter, and a 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.
634 - Metric Miniature Deep Groove Ball Bearings
Technical Specifications
| Overview | |
|---|---|
| Part Number | 634 |
| Dimensions | |
| Bore Diameter (d) | 4 mm |
| Width (B) | 5 mm |
| Outer Diameter (D) | 16 mm |
| Open Width B | 5 mm |
| Radius rs min | 0.3 mm |
| Flange Df | 18 mm |
| Closed Width B1 | 5 mm |
| Open Flange Width Bf | 1 mm |
| Closed Flange Width Bf1 | 1 mm |
| Performance | |
| Dynamic Load Cr (N) | 1340 N |
| Static Load C0r (N) | 523 N |
| Grease Speed (x1000 rpm) | 36 x1000 rpm |
| Oil Speed (x1000 rpm) | 43 x1000 rpm |
| Design Configurations | |
| Open Model | 634 |
| Flanged Open Model | F634 |
| Shielded Model | 634ZZ |
| Flanged Shielded Model | F634ZZ |
| 2RS | 2RS |
| 2RU | 2RU |
| TTS | TTS |
| Internal Design & Weight | |
| Cage Type | J |
| Ball Qty. Z | 7 |
| Ball Size Dw | 2.381 mm |
| Shielded Weight (g) | 5.44 g |
| Flanged Shielded Weight (g) | 5.86 g |
| Open Weight (g) | 5.24 g |
| Flanged Open Weight (g) | 5.66 g |
634 16 mm 4 mm 5 mm Frequently Asked Questions about 634 Metric Miniature Deep Groove Ball Bearings
Find key technical answers regarding dimensions, specifications, and replacement options for this model.
Yes, CHG Bearing works closely with industrial OEMs and brand distributors. We offer turnkey custom engineering for 634, including laser-etched customer logos, custom internal radial clearances, specialized grease formulations, and bespoke protective packaging.
In its sealed configuration (Open Type), CHG Bearing pre-charges 634 with premium wide-temperature lithium-complex or polyurea grease, calibrated to a 30%–35% cavity volume ratio. For open-type variants, synthetic PAO or refined mineral lubricating oils with appropriate EP (Extreme Pressure) additives should be circulated.
Model 634 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 4 mm) and steep thermal gradients between inner and outer rings.
To match diverse operational dynamics, CHG Bearing supplies 634 with multiple cage configurations: high-strength pressed steel ribbon cages for standard duty, solid machined brass cages (M/CA) for heavy vibration and shock loads, or lightweight glass-fiber reinforced polyamide cages (TN9/TVP) for high acceleration and ultra-low noise.
