Overview
The NTN 6204ZZC3/EM is a precision single-row deep groove radial ball bearing engineered for demanding industrial applications. This bearing features C3 clearance, steel cage construction, and double metal shields (ZZ), with a 20 mm bore ID, 47 mm OD, and 14 mm width. The electric motor (EM) designation indicates suitability for high-speed motor applications where thermal expansion and clearance control are critical. NTN is one of the three largest bearing companies in the world with more than ninety years of manufacturing expertise.
Key Features
- Double Shielded Design: Metal shields fastened to the outer ring retain lubricant and prevent entrance of foreign matter through a close clearance labyrinth seal
- C3 Clearance: Accommodates thermal growth in electric motor and high-speed machinery spindle applications
- Steel Cage: Durable pressed steel cage for load distribution and ball retention
- High-Speed Capable: Precision tolerances permit high-speed operation
- Radial Load Support: Single row radial ball bearings are suitable for radial loads, or a combination of thrust and radial loads
Technical Specifications
The bearing delivers consistent performance across standard industrial duty cycles:
Typical Applications
The NTN 6204ZZC3/EM is widely used in:
- Electric motor assemblies and fan motors
- Machine tool spindles and gearbox shafts
- Pump and compressor drive systems
- Conveyor and pulley assemblies
- High-speed rotating machinery requiring thermal clearance
- HVAC units and industrial cooling fans
Compatibility & Replacements
Compatible With
- Standard ISO 630 metric shaft diameters (20 mm nominal)
- Motor housings and bearing blocks designed for 47 mm OD pillow blocks
- Industrial machinery requiring 14 mm width constraints
- High-speed rotating equipment up to typical motor duty speeds
Replaces / Drop-In Replacement For
- NTN 6204ZZC3 (standard version without EM designation)
- NSK 6204ZZC3, FAG 6204ZZC3 (equivalent deep groove bearings in same dimensional series)
- Timken 204K (metric equivalent bearing)
Works With
- Standard metric bearing mounting systems and ISO housings
- Grease-lubricated or oil-lubricated environments
- Thermal expansion design for temperatures typical of motor duty (up to 100°C continuous)
- Industry standard bearing maintenance and replacement protocols
