6304ZZ
6304ZZ
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Compatibility
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Reference Diagrams
Visit our diagram page for part references to popular models
Product Description
The 6304ZZ is a single row deep groove ball bearing with double non-contact steel shields, measuring 20 mm bore diameter by 52 mm outer diameter by 15 mm width. It features high carbon chromium steel rings and balls, a pressed steel cage, standard radial internal clearance, and is cross-compatible with multiple bearing manufacturers’ equivalents.
Specifications
Part Numbers
| Manufacturer Part Number | 6304ZZ |
| Equivalent Part Numbers | NSK 6304ZZ, Koyo 6304ZZ, SKF 6304-2Z, FAG 6304-2ZR |
| Cross-Reference Part Numbers | Interchanges with NTN 6304ZZ, Nachi 6304ZZE, MRC 304-SZZ, Timken 6304ZZ |
Frequently Asked Questions
Q: What are the exact dimensions of the 6304ZZ bearing?
A: The 6304ZZ single row deep groove ball bearing has a 20 mm bore diameter, 52 mm outer diameter, and 15 mm width. Note that the outer diameter (52 mm) differs slightly from some 6304 variants, so verify fit in your equipment.
Q: What manufacturers produce 6304ZZ equivalent bearings?
A: The 6304ZZ designation is produced by multiple bearing manufacturers including NSK, Koyo, SKF (6304-2Z), FAG (6304-2ZR), NTN, Nachi (6304ZZE), MRC (304-SZZ), and Timken. All meet the same ISO metric 6304 deep groove ball bearing standard and are cross-compatible for replacement purposes.
Q: What material composition does the 6304ZZ have?
A: The 6304ZZ uses high carbon chromium steel for both the inner and outer rings and the rolling balls. This material provides excellent hardness, wear resistance, and load capacity for manual pallet jack applications.
Q: What protection do the double non-contact steel shields provide?
A: The double non-contact steel shields (ZZ designation) prevent large debris and moisture from entering the bearing cavity. Unlike contact seals, they do not touch the raceway and produce minimal friction. They do not trap lubrication as effectively as sealed designs, so periodic regreasing may be necessary.
Q: Is the 6304ZZ suitable for cold storage or wet floor applications?
A: The 6304ZZ metal shields offer moderate protection in damp conditions but are not optimized for prolonged wet or cold storage exposure. For regular use in freezer environments or on wet floors, consider sealed variants with nitrile seals (2RS) which provide better moisture and contamination exclusion and include pre-lubrication.
