The 6304 is an unsealed, premium-grade Single-Row Deep Groove Ball Bearing engineered for integration inside secure, enclosed mechanical housings. By entirely omitting side shields and rubber seals, this bearing offers unhindered access to its internal rolling elements, maximizing the flow of external lubricants. With precise metric dimensions of a 20 mm bore, a 52 mm outer diameter, and a 15 mm width, it is categorized under the medium-duty ISO 6300 series. This beefier structural profile provides significantly higher radial and axial load-bearing capabilities than lighter 6000 or 6200 series alternatives of the same bore size.

The 6305 is an unsealed, single-row deep groove ball bearing engineered specifically for enclosed industrial environments where maximum rotational speed and minimal friction are the top priorities. Featuring a completely open architecture without seals or shields, this bearing allows for the free flow of external lubricants directly into the rolling elements. With a 25 mm bore diameter, a 62 mm outside diameter, and a 17 mm width, it falls under the medium-duty ISO 6300 series, offering a thicker cross-section and significantly higher load-bearing capabilities than standard light-duty alternatives.