Deep Groove Ball Bearings（618 / 619 SERIES）
Compact precision, low friction and high-speed capabilityCHG 618/619 precision deep groove ball bearings are single-row, thin-section metric bearings developed for compact, low-friction and high-speed rotating systems. Their deep raceways support predominantly radial loads and can also accommodate axial loads in both directions within the allowable clearance and operating conditions.
Deep Groove Ball Bearings（618 / 619 SERIES）
Series Positioning
| Series | Dimensional character | Recommended focus |
|---|---|---|
| 618 | Smallest cross-section at the same bore | Space saving, lower mass, higher speed potential |
| 619 | Larger outside diameter and width | Higher load capacity and rigidity |
Key Product Benefits
- Low friction and low running noise.
- P4 dimensional and rotational precision.
- Two-direction axial locating capability.
- Open or sealed configurations with grease/oil options.
- Steel, stainless-steel and ceramic rolling-element options.
Technical Specifications
| Parameter | 618 Series | 619 Series |
|---|---|---|
| Bore diameter d | 10–950 mm | 10–950 mm |
| Outside diameter D | 19–1150 mm | 22–1250 mm |
| Width B | 5–90 mm | 6–132 mm |
| Dynamic radial rating Cr | 1.72–637 kN | 2.70–1010 kN |
| Static radial rating C₀r | 0.84–1730 kN | 1.27–2800 kN |
| Mass | 0.005–190 kg | 0.009–390 kg |
| Grease limiting speed | 290–34,000 r/min | 260–32,000 r/min |
| Oil limiting speed | 350–40,000 r/min | 320–38,000 r/min |
Standard Product Definition
| Item | Specification |
|---|---|
| Precision | P4 |
| Row configuration | Single row |
| Load direction | Predominantly radial; axial in both directions |
| Ring material | Bearing steel or stainless steel |
| Ball material | Bearing steel, stainless steel or ceramic |
| Cage | Brass, PEEK, polyimide or phenolic-resin laminate |
| Operating temperature | Standard workbook range: −50 to +100 °C |
Key Features
Clearance and Load
Minimal radial clearance generally supports accurate, low-noise rotation. Increased clearance can raise the effective contact angle under axial load and improve axial capacity, but it may reduce rotational accuracy and rigidity. Select clearance after considering interference fits, temperature differences and shaft/housing accuracy.
Speed and Lubrication
The catalog limiting speeds assume correctly mounted single bearings, light preload, suitable lubrication and stable operating temperature. Oil lubrication generally supports higher speed; grease lubrication simplifies maintenance. Actual allowable speed should be derated for preload, pairing, sealing, temperature and load.
Mounting Essentials
Control shaft and housing roundness; thin rings are sensitive to deformation.
Apply mounting force only through the ring being fitted.
Avoid excessive misalignment and shock loads.
Use matched shaft/housing tolerances to preserve P4 accuracy.
Key Features
Precision instruments, low-noise motors, machine-tool auxiliary spindles, automation equipment, compact gear units, medical devices, robotics, automotive and general precision machinery.
Information Required for Selection
Required bore, outside diameter and width
Radial/axial loads and duty cycle
Target speed and lubrication method
Shaft/housing fits, clearance and sealing
Temperature, corrosion and cleanliness conditions
Available Models & Specifications
Click on any part number to view detailed CAD drawings and download PDF specifications.