The NTN 6303ZZ is a high-performance deep groove ball bearing engineered for demanding industrial applications requiring precision motion and robust contamination resistance. Featuring a standard 17mm bore, 47mm outer diameter, and 14mm width, this bearing utilizes two non-contacting metal shields (ZZ) that effectively retain the factory grease while offering superior protection against dust, dirt, and particulates. Constructed from premium Japanese bearing steel, the 6303ZZ offers an optimal balance of high rotational speed capability (up to 18,000 RPM based on grease lubrication) and substantial static and dynamic load handling, making it the benchmark choice for electric motors, gearboxes, pumps, and agricultural machinery.
As a Senior Product Manager, we emphasize the exceptional reliability of the NTN brand. The 6303ZZ design minimizes friction and heat generation, resulting in prolonged service life and reduced maintenance cycles. This bearing is pre-lubricated with high-quality polyurea grease and is considered 'lubricated for life' under standard operating conditions. Specifying the NTN 6303ZZ ensures ISO-compliant interchangeability and provides OEMs and MRO teams with a cost-effective solution that maximizes machine uptime and operational efficiency in critical high-speed or medium-load environments.
Key Features
Premium NTN Quality: Manufactured using high-grade Japanese steel for maximum durability.
ZZ Shielding: Provides robust protection against industrial contaminants while retaining internal lubricant.
High Dynamic Load Capacity: Rated for 11.5 kN, suitable for medium to heavy radial loads.
Pre-Lubricated: Ready for installation; sealed and lubricated for reduced maintenance.
ISO Standard Interchangeability: Direct drop-in replacement for any 6303-ZZ bearing code from major manufacturers.
High Rotational Speed Capability: Engineered for high-speed industrial motor and shaft applications.
Technical Specifications
bearing_type
Deep Groove Ball Bearing
d
17 mm (Bore Diameter)
D
47 mm (Outer Diameter)
B
14 mm (Width)
material
High Carbon Chromium Steel (SAE 52100 Equivalent)
closure_type
ZZ (Double Metal Shielded)
clearance_standard
CN (Normal) - Default Industrial Fitment (C3 often requested for motor applications)
