Manufactured by CHG Bearing, the R3A is a precision Inch Miniature Deep Groove Ball Bearings. Key dimensional parameters include a 4.762 mm bore diameter, a 15.875 mm outer diameter, and a 4.978 mm overall width. This component is designed to meet standard load requirements and ensure consistent operational performance. For comprehensive technical evaluation, please explore the detailed specifications, dimensional data, product images, and CAD drawings provided below. A complete PDF data sheet is also readily available for direct download to support your engineering and procurement needs.
R3A - Inch Miniature Deep Groove Ball Bearings
Technical Specifications
| Overview | |
|---|---|
| Part Number | R3A |
| Dimensions | |
| Bore Diameter (d) | 4.762 mm |
| Width (B) | 4.978 mm |
| Outer Diameter (D) | 15.875 mm |
| Open Width B | 4.978 mm |
| Radius rs min | 0.3 mm |
| Closed Width B1 | 4.978 mm |
| Performance | |
| Dynamic Load Cr (N) | 1480 N |
| Static Load C0r (N) | 621 N |
| Grease Speed (x1000 rpm) | 38 x1000 rpm |
| Oil Speed (x1000 rpm) | 45 x1000 rpm |
| Design Configurations | |
| Open Model | R3A |
| Flanged Open Model | - |
| Shielded Model | R3AZZ* |
| Flanged Shielded Model | - |
| 2RS | 2RS |
| 2RU | 2RU |
| TTS | - |
| Internal Design & Weight | |
| Cage Type | J |
| Ball Qty. Z | 8 |
| Ball Size Dw | 2.381 mm |
| Shielded Weight (g) | 5.08 g |
| Open Weight (g) | 4.75 g |
R3A 15.875 mm 4.762 mm 4.978 mm Frequently Asked Questions about R3A Inch Miniature Deep Groove Ball Bearings
Find key technical answers regarding dimensions, specifications, and replacement options for this model.
Beyond standard alloy steel, CHG Bearing can customize the R3A Inch Miniature Deep Groove Ball Bearings using AISI 440C stainless steel, black oxide coating, zinc-nickel plating, or hybrid ceramic (Si3N4) balls for applications involving chemical exposure, marine salt fog, or galvanic current hazards.
The Open Type engineered for R3A by CHG Bearing utilizes precision non-contact metal shields or reinforced NBR/FKM contact lip seals. This barrier prevents particulate ingress, washdown fluids, and abrasive dust from reaching the raceways while eliminating grease leakage under centrifugal forces.
As standard production, CHG Bearing subjects R3A to precision bainite or martensite quenching, offering dimensional stability up to 120°C (248°F). For high-heat processing equipment, CHG Bearing also supplies custom S0 (150°C), S1 (200°C), or S2 (250°C) stabilization heat treatments upon request to prevent residual austenite transformation.
In its sealed configuration (Open Type), CHG Bearing pre-charges R3A with premium wide-temperature lithium-complex or polyurea grease, calibrated to a 30%–35% cavity volume ratio. For open-type variants, synthetic PAO or refined mineral lubricating oils with appropriate EP (Extreme Pressure) additives should be circulated.
