HCH Bearings Deep Groove Ball Bearing, ZZ or 2RZ, 604 to 6906 - Models Complete

The model number encodes the series and bore. For example, HCH6204-ZZ breaks down as: 6 = deep groove ball bearing, 2 = 200-series (medium cross-section), 04 = bore code (04 × 5 = 20 mm bore), ZZ = double metal shield. For bore codes 00–03 the bore is 10, 12, 15, and 17 mm respectively. Always cross-check against the Size (IDxODxThickn) variant label shown in the listing to confirm all three dimensions before ordering.

ZZ bearings use non-contact metal shields. They generate less friction and run cooler at higher speeds, making them a good choice for electric motors, fans, and spindles where speed matters and the environment is relatively clean. 2RS bearings use rubber contact seals that physically touch the inner ring, providing a positive barrier against fine dust, light water spray, and contaminants. Choose 2RS for outdoor equipment, garden tools, or any application where the bearing may be exposed to moisture or grit.

Deep groove ball bearings are primarily designed for radial loads but can accommodate moderate axial loads in both directions — typically up to about 25–50% of the dynamic radial load rating, depending on the specific model. For applications with predominantly axial loading, a dedicated thrust bearing or angular contact bearing would be more appropriate. Consult the HCH load rating data for your specific model if precise load calculations are required.

Yes. All models conform to ISO 15 dimensional standards, which means an HCH6205-2RS is dimensionally identical to a SKF 6205-2RS, NSK 6205DDU, or any other ISO-compliant 6205 bearing. As long as the bore, OD, and width match your application, these bearings are direct drop-in replacements regardless of the original brand.

No. Every bearing in this listing is pre-filled with lithium-based grease at the factory and is ready to install straight from the packaging. For ZZ-shielded bearings, the shields can be carefully removed if you need to re-grease with a specific lubricant for extreme temperatures or specialized applications. 2RS rubber seals are more difficult to remove without damage, so they are best used as-is with the factory grease.

Common signs of a worn or failed bearing include: audible grinding, clicking, or rumbling noise during rotation; excessive play or wobble when the shaft is moved radially; visible rust, pitting, or spalling on the raceway or balls; and increased operating temperature in the bearing housing. If you notice any of these symptoms, replacing the bearing promptly prevents damage to surrounding components such as shafts, housings, and seals.

Always apply installation force to the ring being press-fitted — the outer ring when pressing into a housing, and the inner ring when pressing onto a shaft. Never strike the bearing directly with a hammer; use a bearing press, a proper installation sleeve, or a socket that contacts only the ring being fitted. Applying force through the balls will damage the raceways and drastically shorten bearing life. For interference fits, gently heating the bearing (up to approximately 80–100 °C / 176–212 °F) in an oven or bearing heater will expand the ring enough for easy installation without force.

Yes. Simply add the desired bearing model, size, and quantity combination to your cart for each variant you need. All variants in this listing can be added to a single order, allowing you to stock multiple sizes in one purchase.