Deep-Groove Ball Bearings

Select a bearing by matching the shaft diameter to the inner bore and confirming the outer diameter fits the housing; check the tolerance class (e.g., normal, C3) for required radial clearance and ensure the bearing series and width meet axial and radial load requirements

They handle primarily radial loads and moderate axial loads in both directions, and are suitable for medium to high speeds depending on lubrication and internal clearance; consult manufacturer speed ratings for specific limits

Common materials are chrome steel (high strength) and stainless steel (corrosion resistance); sealing options include open bearings, rubber seals (contact) for contamination protection, and metal shields for lighter protection—choose based on exposure to moisture, dust, and chemicals

Proper lubrication reduces friction and wear; grease is typical for ease of maintenance and stays in place for many applications, while oil allows better heat dissipation and higher speeds—select lubricant viscosity and re-lubrication intervals per operating temperature and speed

Regularly check for abnormal noise, vibration, temperature rise, and lubricant condition; follow scheduled re-lubrication, avoid misalignment and contamination, and replace bearings showing pitting, discoloration, or excessive play

Tighter tolerance classes improve runout and precision for high-speed or precision applications, while greater internal clearance (like C3) accommodates thermal expansion and heavier loads—choose based on fit, temperature range, and application precision needs

Individual bearings vary by size, material, and seal type; budget options for common sizes can be under $50, while specialty stainless or precision-grade bearings cost more, with typical retail averages in the tens of dollars per unit