Product Description
OD: 2.047 inch or 52MM; ID: 0.787 inch or 20MM; Width: 0.591 inch or 15MM
Frequently Asked Questions
Q: What are the specifications of the BS 6304 ZZ bearing?
A: The BS 6304 ZZ is a deep groove ball bearing with outer diameter of 2.047 inch (52MM), inner diameter of 0.787 inch (20MM), and width of 0.591 inch (15MM). The ZZ designation indicates metal shields on both sides. This bearing has identical dimensions to the BS 6304 2RS but uses shields instead of seals.
Q: What is the difference between BS 6304 ZZ and BS 6304 2RS?
A: Both bearings have identical dimensions and load ratings. The BS 6304 ZZ has metal shields that do not contact the inner race, allowing easier lubrication. The BS 6304 2RS has rubber seals that contact the inner race, providing better contamination protection. Choose ZZ for clean indoor warehouses with frequent relubrication needs, and choose 2RS for dusty or damp environments.
Q: Which pallet jack models use the BS 6304 ZZ bearing?
A: The BS 6304 ZZ fits load and drive wheel assemblies on equipment from Crown, Toyota, Raymond, Yale, Hyster, Jungheinrich, Linde, Clark, Mitsubishi, CAT, and BT. This size is used on higher-capacity or rough-duty equipment. Verify your model and serial range match before ordering.
Q: How often does the BS 6304 ZZ need relubrication?
A: The metal shield design allows relubrication every 500-800 operating hours or quarterly, whichever comes first. Metal shields do not trap grease as effectively as seals, so more frequent lubrication is required. Use bearing grease compatible with your equipment specifications. Inadequate lubrication causes bearing noise and premature wear.
Q: Can the BS 6304 ZZ be used as a direct replacement for BS 6304 2RS?
A: Yes, dimensionally they are interchangeable. However, if your equipment was originally fitted with 2RS-sealed bearings, switching to ZZ shields may result in more frequent maintenance requirements and reduced contamination protection. If your original equipment used ZZ shields, you can confidently upgrade to 2RS seals for better protection in dusty environments.