ISK Bearings | B2B Bearing Wholesale
Ball Bearing 608 |
|
|---|---|
| Type | Ball |
| Material, bearing | Bearing Steel |
| Bore diameter(d) | 8 mm |
| Outside diameter(D) | 22 mm |
| Width(B) | 7 mm |
| Cr (kgf) | 335 kgf |
| Cor (kgf) | 140 kgf |
| Cage | Steel / Nylon |
| Number of Raceway Ring Rows | Single Row |
| Size Standards | Metric |
* ISK bearing precision conforms to internationally recognized standards: ABEC、ISO 492, DIN 620, and JIS B1514.
Provides the inner raceway, fits onto the shaft and rotates with it.
Acts as the stationary raceway, completes the race circuit and is fixed in the housing.
These small, spherical rolling elements reduce friction and support the load.
Maintains ball spacing, prevents ball-to-ball contact, and minimizes friction.
Material Summary: Inner and outer rings are typically bearing steel, balls are steel, and cages may be steel or nylon depending on speed and environmental requirements.
The 608 bearing comes in three main sealing configurations: OPEN, ZZ, and 2RS.
608 OPEN, 608 ZZ, and 608 2RS offer different levels of protection to suit your application environment and performance needs.
No shields or seals — internal components are exposed.Offers the lowest friction for clean environments, but is more suitable for lower‑speed applications and requires frequent cleaning and lubrication.
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Metal shields on both sides effectively block dust and contaminants while retaining lubrication. Suitable for moderately clean environments requiring protection with lower friction.
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Rubber seals on both sides provide superior protection against moisture, dust, and contaminants. Ideal for harsh environments with dust, oil mist, or water exposure. Slightly higher friction but significantly extended service life.
The primary difference lies in sealing effectiveness and friction:
Choose based on your operating environment and maintenance preferences. For challenging conditions, 608 2RS offers better protection; for speed-critical clean applications, 608ZZ is preferred.
608 bearings feature a deep groove design that allows balls to move smoothly, minimizing friction and heat generation — essential for maintaining speed and efficiency.
608 bearings handle both radial loads and moderate axial loads, making them versatile for wheels, pulleys, and multi-directional load applications.
The simple, standardized structure of 608 bearings ensures global availability, easy sourcing, and reduced inventory and maintenance costs.
Installed in wheel hubs, 608 bearings provide smooth, low-friction rolling for speed and stability.
Used in electric motors, fans, and home appliances to support rotor shafts, reduce friction, and extend motor life.
Found in drills, grinders, and sanders, 608 bearings withstand high speeds and continuous operation while minimizing heat and friction.
In material handling and conveyor systems, 608 bearings support rollers and pulleys, ensuring smooth goods movement in warehouses and factories.
Used in specific bicycle frames and linkage points, 608 bearings enhance smoothness and comfort during cycling.
608 bearings are essential across industries requiring smooth rotation, low friction, and high reliability — from skateboarding to industrial automation.
* ISK bearing precision conforms to internationally recognized standards: ABEC、ISO 492, DIN 620, and JIS B1514.
| Model | Bore (mm) | Outer (mm) | Width (mm) | Typical Use |
|---|---|---|---|---|
| 607 | 7 | 19 | 6 | Smaller than 608, ideal for compact structures and smaller shafts. |
| 608 | 8 | 22 | 7 | Most common small deep groove ball bearing — widely used. |
| 609 | 9 | 24 | 7 | Larger bore, suitable for 9 mm shafts and slightly larger equipment. |
Further reading:
Miniature Bearing Size Chart: A Comprehensive Guide to Miniature Ball Bearings
A 608 bearing has a bore (d) of 8 mm, an outer diameter (D) of 22 mm, and a width (B) of 7 mm, weighing about 11.8 g each. Its dynamic load rating is roughly 335 kgf and static load rating about 140 kgf. These dimensions conform to ISO 492, DIN 620, and JIS B1514, suiting shafts with an 8 mm diameter.
A 608ZZ bearing has double-sided metal shields that block dust and contaminants with low friction, suited to general industrial machinery and appliances. A 608RS bearing uses rubber seals that resist moisture and fine dust for stronger protection in wet, dusty, or corrosive settings, with slightly higher friction. The choice depends on operating environment and speed—sharing actual conditions helps confirm the fit.
A 608 bearing is widely used in skateboard and inline-skate wheels, small electric motors, handheld power tools such as drills and grinders, conveyor rollers, and bicycle rotating parts. Its low friction, low noise, and ability to carry both radial and axial loads make the 608 bearing a common miniature ball bearing across consumer and industrial equipment.
A 608 bearing typically uses GCr15 high-carbon chromium bearing steel for its inner ring, outer ring, and steel balls, offering high hardness and strong wear resistance. The cage is usually a synthetic material such as nylon, or steel. Material grade directly affects durability, precision, and high-speed stability, so confirm material needs against your load, speed, and environment during selection.
When sourcing 608 bearings, it helps to share the application, closure type (OPEN/ZZ/RS), running speed, load conditions, operating environment, and required quantity. For alternative supply or custom-integration needs, include drawings or samples. ISK Bearings can then help assess the suitable specification and the next step.
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