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NACHI 30309DJ Tapered Roller Bearing
NACHI 30309DJ metric tapered roller bearing. 45mm ID x 100mm OD x 27.25mm width. Series 303. Chrome steel construction.
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- 303 (Normal Angle, Wide) for optimised load handling
- Carries combined radial and axial loads simultaneously
- Chrome steel (AISI 52100) rings and rollers for durability and fatigue resistance
- Conforms to ISO dimension standards and interchanges with equivalent series
- DJ cup variant for enhanced axial load capacity in reverse direction
- Precision-ground raceways for consistent running accuracy
- Separable cone and cup design simplifies mounting and clearance adjustment
- Tapered roller geometry provides high load capacity and long service life
| Brand | NACHI |
|---|---|
| Bearing Type | Tapered Roller Bearing |
| Series | 303 |
| Inner Diameter (Bore) | 45 mm |
| Outer Diameter | 100 mm |
| Overall Width (T) | 27.25 mm |
| Cone Width (B) | 25 mm |
| Material | Chrome Steel (AISI 52100) |
| Seal Type | Open |
| Dynamic Load Rating (Cr) | 95100 N (95.1 kN) |
| Static Load Rating (C₀) | 107000 N |
| Limiting Speed (Grease) | 3400 rpm |
| Limiting Speed (Oil) | 4700 rpm |
| Fillet Radius (r min) | 2 mm |
| Weight | 0.973 kg |
| Features & Benefits | 303 (Normal Angle, Wide) for optimised load handling Carries combined radial and axial loads simultaneously Chrome steel (AISI 52100) rings and rollers for durability and fatigue resistance Conforms to ISO dimension standards and interchanges with equivalent series DJ cup variant for enhanced axial load capacity in reverse direction Precision-ground raceways for consistent running accuracy Separable cone and cup design simplifies mounting and clearance adjustment Tapered roller geometry provides high load capacity and long service life |
NACHI 30309DJ Tapered Roller Bearing
The NACHI 30309DJ is a precision metric tapered roller bearing designed to carry combined radial and axial loads efficiently. With a bore diameter of 45 mm, outer diameter of 100 mm, and an overall width of 27.25 mm (cone width 25 mm, cup width 18 mm), this bearing conforms to ISO dimension standards and is a direct interchange for equivalent metric tapered roller bearings from other manufacturers.
Design & Construction
Manufactured by NACHI – one of Japan’s leading bearing producers – the 30309DJ is precision-ground from high-carbon chromium bearing steel (AISI 52100 / JIS SUJ2), heat-treated to achieve optimum hardness and fatigue resistance. The tapered roller design features conical raceways on both inner ring (cone) and outer ring (cup), with tapered rollers running between them. This geometry allows the bearing to support combined radial and axial loads simultaneously, with the contact angle determining the ratio of axial to radial load capacity. The normal contact angle design provides a good balance between radial and axial load-carrying ability, making it the most versatile configuration for general-purpose applications. This is a DJ variant featuring a steep-angle cup (outer ring) design that shifts the effective load centre, providing enhanced axial load capacity in the direction opposing the standard cup face.
Performance
Rated for a basic dynamic load capacity of 95.1 kN and a static load capacity of 107.0 kN, this bearing delivers dependable combined-load support and long calculated service life under correct operating conditions. Permissible speeds reach 3,400 rpm with grease lubrication and 4,700 rpm with oil lubrication. The separable design – where the cone (inner ring with roller and cage assembly) and cup (outer ring) can be mounted independently – simplifies installation, allows adjustment of internal clearance or preload, and facilitates maintenance.
Typical Applications
- Automotive wheel hubs, differentials, and transmission assemblies
- Gearboxes, reducers, and power transmission systems
- Machine tool spindles and precision equipment
- Agricultural and construction equipment
- Conveyor and material-handling systems
- Pumps, compressors, and rotating equipment
- Mining, quarrying, and heavy industrial machinery
- Railway and rolling stock components
- Steel and paper mill processing equipment
- General industrial and workshop machinery
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