NJ306 ECM C3 Cylindrical Roller Bearing 30x72x19mm with Brass Cage Higher Radial Clearance
The NJ306 ECM C3 cylindrical roller bearing combines the reinforced ECM brass machined cage design with C3 higher radial internal clearance, making it the optimal choice for applications involving thermal expansion, interference fits, or high-speed operation where standard clearance is insufficient.
- Thermal Expansion Compensation: C3 clearance provides additional internal space to accommodate thermal growth of the shaft and housing at elevated operating temperatures without causing preload or seizure.
- Interference Fit Compatibility: When both inner and outer rings are mounted with interference fits, C3 clearance prevents excessive preload that could shorten bearing life.
- High-Speed Stability: The greater internal clearance reduces heat generation at higher rotational speeds, maintaining stable operation and extending grease life.
- Reinforced Design (E): Enhanced roller and raceway geometry delivers approximately 15-20% higher dynamic load capacity than standard NJ306 bearings.
- Brass Machined Cage (M): High-strength brass construction withstands centrifugal forces at high speeds and provides superior thermal stability up to 200°C.
- Window-Type Guidance (C): Roller-guided cage design optimizes lubrication distribution and reduces internal friction for smoother operation.
| Bore Diameter (d) | 30 mm |
| Outer Diameter (D) | 72 mm |
| Width (B) | 19 mm |
| Radial Internal Clearance | C3 (Greater than Normal) |
| Dynamic Load Rating (Cr) | 49.5 kN |
| Static Load Rating (C0r) | 48 kN |
| Limiting Speed (Grease) | 12,000 rpm |
| Limiting Speed (Oil) | 14,000 rpm |
| Weight | 0.38 kg |
- High-speed electric motors with shaft heating
- Hot air fans and blowers
- Pumps handling high-temperature fluids
- Compressor crankshafts
- Industrial dryer rollers
- Automotive transmissions under thermal load
Every GQZ Bearing NJ306 ECM C3 is manufactured to exacting standards using premium GCr15 bearing steel. Our ISO 9001:2015 certified facility performs 100% dimensional, clearance, vibration, and noise inspection. The combination of ECM reinforced design, brass machined cage, and C3 clearance delivers exceptional reliability in thermally demanding applications.
- Individual anti-rust VCI paper wrapping
- GQZ Bearing branded box with protective foam
- Export-grade fumigated plywood case
- Sample orders: 3-5 working days
- Bulk production: 15-20 days
Contact GQZ Bearing today for competitive pricing, detailed datasheets, or to request samples. OEM and custom packaging available.
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