Manufactured by CHG Bearing, the 684 is a precision Metric Miniature Deep Groove Ball Bearings. Key dimensional parameters include a 4 mm bore diameter, a 10 mm outer diameter, and a 3 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.
684 - Metric Miniature Deep Groove Ball Bearings
Technical Specifications
| Overview | |
|---|---|
| Part Number | 684 |
| Dimensions | |
| Bore Diameter (d) | 4 mm |
| Width (B) | 3 mm |
| Outer Diameter (D) | 10 mm |
| Open Width B | 3 mm |
| Radius rs min | 0.15 mm |
| Flange Df | 11.2 mm |
| Closed Width B1 | 4 mm |
| Open Flange Width Bf | 0.6 mm |
| Closed Flange Width Bf1 | 0.8 mm |
| Performance | |
| Dynamic Load Cr (N) | 711 N |
| Static Load C0r (N) | 272 N |
| Grease Speed (x1000 rpm) | 56 x1000 rpm |
| Oil Speed (x1000 rpm) | 56 x1000 rpm |
| Design Configurations | |
| Open Model | 684 |
| Flanged Open Model | F684 |
| Shielded Model | 684ZZ |
| Flanged Shielded Model | F684ZZ |
| 2RS | 2RS |
| 2RU | 2RU |
| TTS | TTS |
| Internal Design & Weight | |
| Cage Type | J |
| Ball Qty. Z | 8 |
| Ball Size Dw | 1.588 mm |
| Shielded Weight (g) | 1.33 g |
| Flanged Shielded Weight (g) | 1.5 g |
| Open Weight (g) | 0.96 g |
| Flanged Open Weight (g) | 1.04 g |
684 10 mm 4 mm 3 mm Frequently Asked Questions about 684 Metric Miniature Deep Groove Ball Bearings
Find key technical answers regarding dimensions, specifications, and replacement options for this model.
When fitting 684 over a 4 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.
Each 684 produced in CHG Bearing manufacturing facilities features accurately profiled corner chamfers complying with DIN 5412 / ISO standard corner radii. When designing mating shafts and housing shoulders, machining an undercut or fillet radius strictly within the inner ring clearance limit (4 mm bore side) ensures perfect planar contact without edge binding.
To ensure optimum performance of CHG Bearing 684 Metric Miniature Deep Groove Ball Bearings under general rotational loads, our application engineers advise an inner-ring shaft tolerance of m5 or k5 for the 4 mm bore. For the 10 mm outer ring, an H7 or J7 housing bore fit is recommended to eliminate creep while accommodating normal thermal gradient expansion.
Beyond standard alloy steel, CHG Bearing can customize the 684 Metric Miniature Deep Groove Ball Bearings using AISI 440C stainless steel, black oxide coating, zinc-nickel plating, or hybrid ceramic (Si3N4) balls for applications involving chemical exposure, marine salt fog, or galvanic current hazards.
