Manufactured by CHG Bearing, the X8 is a precision Deep Groove Ball Bearings（618 / 619 SERIES）. Key dimensional parameters include a 8 mm bore diameter, a 16 mm outer diameter, and a 4 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.
X8 - Deep Groove Ball Bearings（618 / 619 SERIES）
Technical Specifications
| Overview | |
|---|---|
| Part Number | X8 |
| 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) | 8 mm |
| Width (B) | 4 mm |
| Outer Diameter (D) | 16 mm |
| Bore Diameter Tolerance | -0.004-0 mm |
| Outside Diameter Tolerance | -0.004-0 mm |
| Width Tolerance | -0.04-0 mm |
| Performance | |
| Basic Dynamic Radial Load Rating Cr (kN) | 1.35 kN |
| Basic Static Radial Load Rating C0r (kN) | 0.6 kN |
| Material | |
| Mass (kg) | 0.001 kg |
| Ring Material | Stainless Steel |
| Cage Material | Polyimide |
| Ball Material | Stainless Steel |
| Operating Temperature Range (°C) | -50 to +100 °C |
| Precision Class | P4 |
| Radial Internal Clearance | 0.002-0.013 mm |
X8 16 mm 8 mm 4 mm Frequently Asked Questions about X8 Deep Groove Ball Bearings（618 / 619 SERIES）
Find key technical answers regarding dimensions, specifications, and replacement options for this model.
Yes, CHG Bearing works closely with industrial OEMs and brand distributors. We offer turnkey custom engineering for X8, including laser-etched customer logos, custom internal radial clearances, specialized grease formulations, and bespoke protective packaging.
To match diverse operational dynamics, CHG Bearing supplies X8 with multiple cage configurations: high-strength pressed steel ribbon cages for standard duty, solid machined brass cages (M/CA) for heavy vibration and shock loads, or lightweight glass-fiber reinforced polyamide cages (TN9/TVP) for high acceleration and ultra-low noise.
To ensure optimum performance of CHG Bearing X8 Deep Groove Ball Bearings（618 / 619 SERIES） under general rotational loads, our application engineers advise an inner-ring shaft tolerance of m5 or k5 for the 8 mm bore. For the 16 mm outer ring, an H7 or J7 housing bore fit is recommended to eliminate creep while accommodating normal thermal gradient expansion.
Model X8 is manufactured by CHG Bearing in standard Normal clearance (CN) for ambient temperature transmission, and C3 or C4 clearance for heavy duty applications. C3 clearance compensates for radial shrinkage caused by tight shaft press-fits (bore 8 mm) and steep thermal gradients between inner and outer rings.
