Overview
The Koyo NJ306C3 is a cylindrical roller bearing designed for industrial automation and machinery applications requiring radial load capacity and durability. This bearing features a separable inner ring with one rib and an outer ring with two ribs, making it ideal for heavy-load and impact-load environments. The NJ306C3 configuration allows for flexible shaft alignment and simplified installation in drive trains, pumps, and transmission systems.
Key Features
- Separable inner ring with one rib; outer ring with two ribs for controlled axial positioning
- Line contact between rollers and raceway delivers high radial load capacity
- Single-row design for compact mounting in machinery housings
- New in box condition with full structural integrity
- Roller cage construction ensures stability under continuous operation
Technical Specifications
The following specifications are based on Koyo’s cylindrical roller bearing series design standards:
- Bore Diameter: 30 mm
- Outside Diameter: 72 mm
- Width: 19 mm
- Bearing Type: Cylindrical Roller (Single-Row, Separable)
- Inner Ring Configuration: One Rib
- Outer Ring Configuration: Two Ribs
- Cage Type: Pressed Steel
- Load Capacity (Dynamic): ~53 kN
- Load Capacity (Static): ~50 kN
- Max Speed (Grease): 8,700 rpm
- Max Speed (Oil): 12,000 rpm
- Approximate Weight: 0.36 kg
- Condition: New in Box
Typical Applications
The Koyo NJ306C3 is widely used in:
- Industrial gearboxes and speed reducers
- Pump and motor shafts subject to heavy radial loads
- Machine tool spindles and drive systems
- Conveyor systems and material handling equipment
- Automotive and heavy equipment drive trains
- Any application requiring separable bearing configuration for ease of maintenance
Compatibility & Replacements
Compatible With
- Standard industrial bearing housings and pillow blocks rated for 30 mm bore diameter
- Shaft-mounted gearbox and pump applications
- Applications using ISO 15:1-ratio load designs
- Both grease and oil lubrication systems
Replaces / Drop-In Replacement For
- NJ306R (non-C3 variant)
- NTN NJ306C3 (equivalent specification)
Works With
- NLGI Grade 2 lithium complex grease (standard lubrication)
- ISO VG 32–46 bearing oils
- Standard industrial bearing mounting hardware and seals
- Shaft couplings and mechanical drive components rated for equivalent load class
