Manufactured by CHG Bearing, the 688 is a precision Metric Miniature Deep Groove Ball Bearings. Key dimensional parameters include a 8 mm bore diameter, a 16 mm outer diameter, and a 4 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.
688 - Metric Miniature Deep Groove Ball Bearings
Technical Specifications
| Overview | |
|---|---|
| Part Number | 688 |
| Dimensions | |
| Bore Diameter (d) | 8 mm |
| Width (B) | 4 mm |
| Outer Diameter (D) | 16 mm |
| Open Width B | 4 mm |
| Radius rs min | 0.2 mm |
| Flange Df | 18 mm |
| Closed Width B1 | 5 mm |
| Open Flange Width Bf | 1 mm |
| Closed Flange Width Bf1 | 1.1 mm |
| Performance | |
| Dynamic Load Cr (N) | 1252 N |
| Static Load C0r (N) | 592 N |
| Grease Speed (x1000 rpm) | 36 x1000 rpm |
| Oil Speed (x1000 rpm) | 43 x1000 rpm |
| Design Configurations | |
| Open Model | 688 |
| Flanged Open Model | F688 |
| Shielded Model | 688ZZ |
| Flanged Shielded Model | F688ZZ |
| 2RS | 2RS |
| 2RU | 2RU |
| TTS | TTS |
| Internal Design & Weight | |
| Cage Type | J, TW |
| Ball Qty. Z | 10 |
| Ball Size Dw | 2 mm |
| Shielded Weight (g) | 4.05 g |
| Flanged Shielded Weight (g) | 4.51 g |
| Open Weight (g) | 3.11 g |
| Flanged Open Weight (g) | 3.53 g |
688 16 mm 8 mm 4 mm Frequently Asked Questions about 688 Metric Miniature Deep Groove Ball Bearings
Find key technical answers regarding dimensions, specifications, and replacement options for this model.
When fitting 688 over a 8 mm shaft, CHG Bearing strictly recommends uniform induction heating (controlled between 90°C and 110°C) or precision hydraulic press sleeves. Under no circumstances should direct impact blows be struck against the rings or cage, as shock loads cause brinelling indents and premature spalling.
Sourcing 688 directly from CHG Bearing eliminates intermediate brokerage markups while granting you factory-direct engineering backup, rigorous ISO-certified quality assurance, competitive volume wholesale pricing, and dependable supply chain stability for Metric Miniature Deep Groove Ball Bearings.
Yes, 100% of 688 Metric Miniature Deep Groove Ball Bearings leaving CHG Bearing production lines are subjected to multi-frequency Anderometer sound testing. All units satisfy baseline Z1V1 levels, with dedicated quiet-running electric motor quality (EMQ) lots certified to Z2V2 and Z3V3 standards for silent machinery integration.
To match diverse operational dynamics, CHG Bearing supplies 688 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.
