What is the 638 Series?

Engineered by Welink Bearing, the 638 Series Deep Groove Ball Bearing is a highly specialized thin-section variant. It shares the exact same ultra-compact inner and outer diameters as our standard 68 series but features a distinctly wider cross-section. This expanded width provides increased internal space for advanced sealing mechanisms and greater grease capacity, making it an optimal choice for extended operations within restricted radial footprints.

Key Advantages & Features

• Extended Width Design: Offers the same space-saving radial profile as the 68 series but with added width for improved axial rigidity and better load distribution.

• Enhanced Lubrication Capacity: The wider internal cavity holds significantly more lubricating grease, effectively extending maintenance intervals and overall service life.

• Superior Sealing Protection: The additional width seamlessly accommodates robust double-contact rubber seals (2RS), providing exceptional defense against dust, moisture, and harsh industrial contaminants.

Application Areas

Widely utilized in electric bicycle (e-bike) motors, compact power tool gearboxes, automotive alternators, and light-duty automated guided vehicles (AGVs).

Solutions Provided

If your mechanical design is strictly limited in radial space (requiring a thin 68 series outer diameter) but struggles with premature bearing failure due to severe contamination or lubrication loss, Welink's 638 Series solves this by delivering a wider, highly sealed, and longer-lasting unit without forcing you to redesign the machine's housing diameter.