Shielded Deep Groove Ball Bearing for Light-Duty

Frequently Asked Questions

Q: What is the maximum RPM rating for the 6204-ZZ bearing?
A: The 6204-ZZ is rated for 15,000 RPM maximum under normal conditions. However, the double shield design can create slight friction and heat at very high speeds. For typical manual pallet jack use (under 5,000 RPM), the 6204-ZZ performs well and provides excellent protection against contamination.

Q: Why should I choose the 6204-ZZ over the 6204-Z for light-duty applications?
A: The 6204-ZZ has double metal shields on both sides, blocking dust, moisture, and contaminants better than the single-shield 6204-Z. The -ZZ is ideal for light-duty pallet jacks, hand trucks, and casters where moderate contamination protection is needed without the cost of dual rubber seals. It is suitable for standard warehouse and light outdoor use.

Q: How does the 6204-ZZ compare to the 6204-2RS in terms of sealing?
A: The 6204-ZZ uses metal shields that allow some air circulation and are easier to clean. The 6204-2RS uses dual rubber seals that trap grease and provide maximum water resistance. For wet or cold storage environments, choose -2RS. For dry warehouses with occasional light dust, the -ZZ is adequate and lower cost.

Q: What cross-reference part numbers are equivalent to the 6204-ZZ?
A: The 6204-ZZ is equivalent to Koyo 6204ZZ, SKF 6204-2Z, FAG 6204ZZ, NSK 6204ZZ, and NTN 6204ZZ. Cross-reference with 6204, 6204-Z, 6204-RS, and 6204-2RS only if the load wheel bore and outer diameter dimensions match. Seal types affect fit and performance, so confirm compatibility before substituting.