China NU2308 Cylindrical Roller Bearing Suppliers - Factory Large Radial Load Capacity for Industrial Drives
NU2308 Bearing Detail & Specifications
Key Features of NU2308 Cylindrical Roller Bearing
The roller and raceway are configured with line contact or modified line contact, delivering superior radial load capacity to withstand heavy duty and impact loads in rock drills, crushers, and rolling mills.
Engineered with a low friction coefficient, limiting speeds approximate those of deep groove ball bearings. Reduced friction between rolling elements and ribs ensures peak performance in printing machines.
N and NU configurations permit axial free movement, effectively compensating for shaft expansion, contraction, or mounting misalignments caused by temperature fluctuations.
The separable bearing ring design allows inner and outer rings to be mounted independently, significantly accelerating overhaul, mounting routines, and reducing overall maintenance overhead.
Ideal for demanding operating conditions across mining, metallurgy, civil construction, chemical, and woodworking sectors, including equipment like forklifts, vibrating screens, and boring machines.
Application Fields
Industrial Machinery
Provides critical support to high-precision machine tool spindles to ensure rotational stability under heavy radial forces. It also powers mixing shafts in large concrete equipment to ensure uninterrupted and uniform mixing.
Agricultural Machinery
Deploys in tractor gearboxes to support gear shafts against combined gear transmission forces. In harvesting machinery, it stabilizes material conveying rollers against high continuous friction and pressure.
Automotive Industry
Supports automotive transmission input, output, and countershaft gears to maintain engagement precision. Also applied in specialized vehicle wheel hubs and related rotational components.
Other Heavy Equipment
Handles crankshaft radial dynamics in HVAC air conditioning compressors and provides stable shaft support in industrial blowers, large air ventilation fans, and exhaust drives.
Cylindrical Roller Bearings Technical Sheet
| Bearing Numbers | Boundary Dimensions (mm) | Basic Load Ratings (N) | Limiting Speeds (r/min) | Weight | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| NU | NJ | NUP | N | NF | d | D | B | r (min) | r1 (min) | Cr (Dynamic) | Cor (Static) | Grease | Oil | kg (approx.) |
| NU204 | NJ | NUP | N | NF | 20 | 47 | 14 | 1.0 | 0.6 | 16600 | 13900 | 17000 | 20000 | 0.111 |
| NU204E | NJ | NUP | - | - | 47 | 14 | 1.0 | 0.6 | 25700 | 22600 | 15000 | 18000 | 0.122 | |
| NU2204 | NJ | NUP | N | - | 47 | 18 | 1.0 | 0.6 | 22200 | 20300 | 15000 | 18000 | 0.144 | |
| NU2204E | NJ | NUP | - | - | 47 | 18 | 1.0 | 0.6 | 30500 | 28300 | 14000 | 16000 | 0.158 | |
| NU304 | NJ | NUP | N | NF | 52 | 15 | 1.1 | 0.6 | 23100 | 19200 | 14000 | 17000 | 0.153 | |
| NU304E | NJ | NUP | - | - | 52 | 15 | 1.1 | 0.6 | 31500 | 26900 | 13000 | 15000 | 0.176 | |
| NU2304 | NJ | NUP | N | - | 52 | 21 | 1.1 | 0.6 | 33000 | 30000 | 13000 | 15000 | 0.250 | |
| NU2304E | NJ | NUP | - | - | 52 | 21 | 1.1 | 0.6 | 42000 | 39000 | 12000 | 14000 | 0.242 | |
| NU1005 | NJ | NUP | N | - | 25 | 47 | 12 | 0.6 | 0.3 | 15100 | 14100 | 16000 | 19000 | 0.092 |
| NU205 | NJ | NUP | N | NF | 52 | 15 | 1.0 | 0.6 | 18800 | 17000 | 14000 | 16000 | 0.137 | |
| NU205E | NJ | NUP | - | - | 52 | 15 | 1.0 | 0.6 | 29300 | 27700 | 13000 | 15000 | 0.151 | |
| NU2205 | NJ | NUP | N | - | 52 | 18 | 1.0 | 0.6 | 25100 | 24700 | 13000 | 15000 | 0.166 | |
| NU2205E | NJ | NUP | - | - | 52 | 18 | 1.0 | 0.6 | 35000 | 34500 | 11000 | 13000 | 0.186 | |
| NU305 | NJ | NUP | N | NF | 62 | 17 | 1.1 | 1.1 | 31500 | 27700 | 12000 | 14000 | 0.241 | |
| NU2305E | NJ | NUP | - | - | 62 | 24 | 1.1 | 1.1 | 57000 | 56000 | 9700 | 11000 | 0.386 | |
| NU208 | NJ | NUP | N | NF | 40 | 80 | 18 | 1.1 | 1.1 | 43800 | 43000 | 9400 | 11000 | 0.378 |
| NU2208 | NJ | NUP | N | - | 80 | 23 | 1.1 | 1.1 | 58000 | 62000 | 8500 | 10000 | 0.490 | |
| NU308 | NJ | NUP | N | NF | 90 | 23 | 1.5 | 1.5 | 58500 | 57000 | 8000 | 9400 | 0.658 | |
| NU2308 | NJ | NUP | N | - | 90 | 33 | 1.5 | 1.5 | 82500 | 88000 | 7000 | 8200 | 0.951 | |
| NU2308E | NJ | NUP | - | - | 90 | 33 | 1.5 | 1.5 | 114000 | 122000 | 6400 | 7500 | 1.060 | |
Our Advantages & Services
Engineered solutions crafted around precise application demands and working load requirements.
In line with ISO benchmarks, comprehensive testing is enforced across raw materials, machining, and packaging.
Eco-friendly export packaging with custom wooden cases, barcodes, and private labeling on request.
Cost-efficient maritime freight for heavy bulk orders, with expedited air cargo available for urgent demands.
Comprehensive warranty coverage covering material defects and workmanship for 12 months post-shipment.
Frequently Asked Questions (FAQ)
The NU2308 cylindrical roller bearing features an inside bore (d) of 40 mm, an outside diameter (D) of 90 mm, and a width (B) of 33 mm, with an approximate unit weight of 0.951 kg.
NU2308 delivers a high dynamic load rating (Cr) of 82.5 kN and a static load rating (Cor) of 88 kN, making it suitable for handling heavy radial forces and shock loads.
Yes. Because it is an NU-type cylindrical roller bearing, it allows free axial movement between the inner and outer rings, effectively compensating for thermal expansion and mounting tolerances.
The bearing operates within a temperature range of -40℃ to 120℃. It achieves a limiting speed of up to 7,000 r/min with grease lubrication and up to 8,200 r/min with oil lubrication.
It is widely used in automotive transmissions, agricultural gearboxes and harvesters, concrete mixer shafts, rock drills, crushers, rolling mills, and industrial compressor units.
Products come with a 12-month quality warranty from the date of shipment. OEM services, customized packaging, custom clearance ratings (C0-C5), and precision grades (P0-P2) are available upon request.