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60 Series
Home Deep Groove Ball Bearings 60 Series

608 Unshielded Deep Groove Ball Bearing | 8×22×7 mm for Electric Motors & Power Hand Tools

608 Unshielded Deep Groove Ball Bearing | 8×22×7 mm for Electric Motors & Power Hand Tools

The 608 Open is a highly versatile, single-row deep groove ball bearing engineered for applications that require unhindered rotation and easy access for continuous lubrication. Manufactured without shields or seals, this "open" configuration eliminates all seal-induced contact friction, allowing for the absolute maximum rotational speed. With an industry-standard 8mm bore, a 22mm outer diameter, and a 7mm width, the unshielded 608 is the go-to structural component for high-speed electric motors, household appliances, and industrial power tools operating in clean environments.

608 Deep Groove Ball Bearing 8x22x7 mm | Free-Rolling Configuration

Built to conform strictly to ISO metric tolerances, the 608 Open bearing features a finely polished deep-groove geometry that excels at supporting radial loads along with moderate axial loads in both directions. Because it lacks external shielding, this bearing is specifically intended for mechanical assemblies housed within closed enclosures—such as motor casings or sealed gearboxes—where dust and debris are already mitigated. This open structure provides engineers with the flexibility to apply external oil baths or custom lubrication systems directly to the rolling elements, ensuring optimal heat dissipation during intense, continuous operation.

608 Unshielded Deep Groove Ball Bearing | 8×22×7 mm for Electric Motors & Power Hand Tools

Comprehensive Applications

Perfectly suited for versatile, high-speed enclosed mechanisms:

Power Tools & Hardware
  • Electric drill and angle grinder internal armatures
  • Circular saw gear drives
  • Router spindle assemblies
  • Rotary sanding tools
Electric Motors & Appliances
  • High-speed vacuum cleaner turbines
  • Washing machine and dryer drum motors
  • Ceiling and exhaust fan central rotors
  • Blender and food processor drive shafts
Recreational & Sporting Equipment
  • Skateboard and longboard wheels (when utilized in enclosed hubs)
  • Inline skates and roller derby gear
  • High-performance kick scooters
  • Fitness treadmills and stationary bike internals
Light Industrial Machinery
  • Conveyor belt idler rollers
  • Automated packaging machinery
  • Textile spinning equipment
  • Small-scale material handling gear

Key Performance Features

01. Zero-Friction Rotational Efficiency

By completely omitting metal shields or rubber seals, the open 608 guarantees zero physical drag against the inner ring. This unhindered free-rolling design achieves the highest possible operational speeds and rapid acceleration, maximizing the mechanical efficiency of your equipment.

02. Direct Lubrication Access

The unshielded design allows for immediate and continuous exposure to external oil or grease supplies. This makes the 608 Open ideal for enclosed gearboxes or oil-bath environments where ongoing fluid circulation is relied upon to flush away heat and maximize the bearing’s lifespan.

03. Rugged Chrome Steel Reliability

Manufactured from high-carbon GCr15 chrome steel, the bearing rings and balls are heat-treated for exceptional hardness and wear resistance. The precision-honed raceways actively reduce operational vibration, delivering a remarkably quiet and stable performance under high RPMs.

Technical Specifications

Bearing Type Single Row Deep Groove Ball Bearing
ISO Dimension Series Standard Metric Series (60 Series)
Basic Designation 608
Suffix None (Open Type)
Bore Diameter (d) 8 mm
Outer Diameter (D) 22 mm
Width (B) 7 mm
Material (Races & Balls) High-Carbon Chrome Steel (GCr15 / AISI 52100)
Precision Class ABEC-1 (ABEC-3 / ABEC-5 Upgrades Available)
Closure Type Open (Unshielded / Unsealed)
Dynamic Load Rating (Cʳ) 3.30 kN
Static Load Rating (C₀ʳ) 1.37 kN
Limiting Speed (Grease) 34,000 r/min
Limiting Speed (Oil) 40,000 r/min
Weight (approx.) 0.012 kg (12.0 g)

Interchange Part Numbers

Direct equivalent for standard unshielded 608 bearings across top global manufacturers:

  • NSK: 608
  • SKF: 608
  • KOYO: 608
  • NTN: 608
  • Nachi: 608
  • FAG: 608
  • NMB: 608

Design & Configuration

While the 608 Open is supplied ready for integration into pre-lubricated enclosures, Welink Bearing also provides sealed alternatives (608-2RS) for dusty environments, and double-shielded versions (608-ZZ) for general-purpose use. For highly corrosive industrial settings, we can manufacture the open 608 in premium AISI 440C stainless steel.

"Delivering unrestricted speed and ultimate lubrication flexibility, the 608 Open bearing is the foundational core for high-performance enclosed motors."

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