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NACHI 5203 Double-Row Angular Contact Ball Bearing
NACHI 5203 double-row angular contact ball bearing. 17mm ID x 40mm OD x 17.5mm width. 30 deg. Open. Chrome steel construction.
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- 30-degree (Standard) for balanced radial and bi-directional axial load support
- Chrome steel (AISI 52100) rings and balls for durability and fatigue resistance
- Compact alternative to matched pairs of single-row bearings
- Conforms to ISO dimension standards and interchanges with equivalent series
- Handles radial, axial, and combined loads in both directions simultaneously
- Increased rigidity and tilting moment capacity
- Precision-ground raceways for consistent running accuracy
- Ready to Install
| Brand | NACHI |
|---|---|
| Bearing Type | Double-Row Angular Contact Ball Bearing |
| Series | 52 |
| Inner Diameter (Bore) | 17 mm |
| Outer Diameter | 40 mm |
| Width | 17.5 mm |
| Contact Angle | 30 deg |
| Material | Chrome Steel (AISI 52100) |
| Seal Type | Open |
| Dynamic Load Rating (Cr) | 15000 N (15 kN) |
| Limiting Speed (Grease) | 12000 rpm |
| Limiting Speed (Oil) | 17000 rpm |
| Fillet Radius (r min) | 0.6 mm |
| Weight | 0.09 kg |
| Features & Benefits | 30-degree (Standard) for balanced radial and bi-directional axial load support Chrome steel (AISI 52100) rings and balls for durability and fatigue resistance Compact alternative to matched pairs of single-row bearings Conforms to ISO dimension standards and interchanges with equivalent series Handles radial, axial, and combined loads in both directions simultaneously Increased rigidity and tilting moment capacity Precision-ground raceways for consistent running accuracy Ready to Install |
NACHI 5203 Double-Row Angular Contact Ball Bearing
The NACHI 5203 is a precision double-row angular contact ball bearing designed to carry radial loads, axial loads in both directions, and combined loads simultaneously. With a bore diameter of 17 mm, outer diameter of 40 mm, and a width of 17.5 mm, this bearing conforms to ISO dimension standards and is a direct interchange for equivalent double-row angular contact bearings from other manufacturers.
Design & Construction
Manufactured by NACHI – one of Japan’s leading bearing producers – the 5203 is precision-ground from high-carbon chromium bearing steel (AISI 52100 / JIS SUJ2), heat-treated to achieve optimum hardness and fatigue resistance. The double-row design effectively combines two single-row angular contact bearings in a back-to-back arrangement within a single unit, enabling the bearing to accommodate axial loads in both directions as well as tilting moments. The standard 30-degree contact angle provides an effective balance between radial and axial load capacity in both directions. The open design allows free oil and grease flow, making this bearing suitable for applications with external lubrication systems or oil bath arrangements.
Performance
Rated for a basic dynamic load capacity of 15.0 kN and a static load capacity of 9.2 kN, this bearing delivers dependable load-carrying ability and long calculated service life under correct operating conditions. Permissible speeds reach 12,000 rpm with grease lubrication and 17,000 rpm with oil lubrication. Double-row angular contact ball bearings are a compact alternative to matched pairs of single-row bearings, offering simplified mounting and reduced assembly width while providing bi-directional axial load support and increased rigidity.
Typical Applications
- Pumps, compressors, and blowers requiring bi-directional axial support
- Gearboxes, reducers, and transmission assemblies
- Electric motors and generators under combined loading
- Agricultural and farming equipment
- Conveyor and material-handling systems
- Automotive drivetrain and wheel hub assemblies
- Printing, packaging, and textile machinery
- HVAC fans and air-conditioning units
- Food and beverage processing machinery
- General industrial and workshop machinery
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