Manufactured by CHG Bearing, the 61909P4 is a precision Deep Groove Ball Bearings（618 / 619 SERIES）. Key dimensional parameters include a 45 mm bore diameter, a 68 mm outer diameter, and a 12 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.
61909P4 - Deep Groove Ball Bearings（618 / 619 SERIES）
Technical Specifications
| Overview | |
|---|---|
| Part Number | 61909P4 |
| Brand | CHG® |
| Characteristics | |
| Bearing Type | Deep Groove Ball Bearing |
| Seal Type | Open / Contact Seal Options |
| Load Direction | Radial |
| Row Configuration | Single Row |
| Dimensions | |
| Bore Diameter (d) | 45 mm |
| Width (B) | 12 mm |
| Outer Diameter (D) | 68 mm |
| Bore Diameter Tolerance | -0.006-0 mm |
| Outside Diameter Tolerance | -0.007-0 mm |
| Width Tolerance | -0.12-0 mm |
| Performance | |
| Basic Dynamic Radial Load Rating Cr (kN) | 14.1 kN |
| Basic Static Radial Load Rating C0r (kN) | 10.9 kN |
| Limiting Speed – Grease (r/min) | 9500 r/min |
| Limiting Speed – Oil (r/min) | 12000 (r/min) |
| Material | |
| Mass (kg) | 0.126 kg |
| Ring Material | Stainless Steel / Bearing Steel |
| Cage Material | Brass / PEEK / Polyimide / Phenolic Resin Fabric Laminate |
| Ball Material | Stainless Steel / Bearing Steel / Ceramic |
| Operating Temperature Range (°C) | -50 to +100 °C |
| Precision Class | P4 |
| Radial Internal Clearance | 0.006-0.023 mm |
61909P4 68 mm 45 mm 12 mm Frequently Asked Questions about 61909P4 Deep Groove Ball Bearings（618 / 619 SERIES）
Find key technical answers regarding dimensions, specifications, and replacement options for this model.
The CHG Bearing 61909P4 is rated for limiting speeds up to standard rated RPM under forced oil-mist or circulating oil lubrication regimes. When lubricated with factory-filled synthetic high-speed grease, safe continuous velocity is maintained at approximately 75% to 85% of the maximum nominal limit, preventing thermal runaway.
In its sealed configuration (Open / Contact Seal Options), CHG Bearing pre-charges 61909P4 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.
As standard production, CHG Bearing subjects 61909P4 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.
Engineered according to international ISO boundary plans, CHG Bearing supplies 61909P4 with a precision bore diameter (d) of 45 mm, an outside diameter (D) of 68 mm, and a nominal ring width (B) of 12 mm. This configuration yields an effective cross-sectional wall thickness of 11.5 mm and an envelope ratio (D/d) of 1.51, delivering compact rigidity for OEM machinery housings.
