Product Description
6304-ZZ is a double shielded single-row deep groove ball bearing assembly for manual pallet jack applications. Features a 20 mm bore, 52 mm outer diameter, and 15 mm width. Constructed with high carbon chrome steel and pressed steel cage, supports dynamic radial loads up to 16.8 kN with standard CN clearance. Cross-references include Koyo, NSK, Fersa, SNR, Timken, and 6304-2Z equivalent types.
Specifications
Bearing Dimensions
| Bore Diameter | 20 mm |
| Outer Diameter | 52 mm |
| Width | 15 mm |
Material & Construction
| Ring and Ball Material | High carbon chrome bearing steel (SAE 52100) |
| Cage Material | Pressed steel |
| Shield Material | Stainless steel, Dual shielded (ZZ type) |
| Clearance | Standard CN |
Load Rating
| Dynamic Radial Load | 16.8 kN |
| Application | Manual pallet jack wheel assemblies |
Part Numbers
| Part Number | 6304-ZZ |
| Cross-Reference Part Numbers | Equivalent to: Koyo 6304ZZ, NSK 6304ZZ, Fersa 6304ZZ, SNR 6304ZZ, Timken 6304-ZZ |
| Replaces/Supersedes | 6304 2Z, 6304ZZC3, 6304ZZNR |
Frequently Asked Questions
Q: What are the dimensions and cross-references for SKU 6304-ZZ?
A: SKU 6304-ZZ is a double-shielded single-row deep groove ball bearing with 20 mm bore, 52 mm outer diameter, and 15 mm width. Cross-references include Koyo 6304ZZ, NSK 6304ZZ, Fersa 6304ZZ, SNR 6304ZZ, Timken 6304-ZZ, and equivalent 6304-2Z types. It supersedes part numbers 6304 2Z, 6304ZZC3, and 6304ZZNR.
Q: What is the dynamic load capacity of SKU 6304-ZZ?
A: SKU 6304-ZZ supports dynamic radial loads up to 16.8 kN under standard CN clearance conditions. The bearing is rated for pallet jack and manual lift truck wheel assemblies. Actual equipment load must not exceed bearing capacity. Verify equipment weight distribution and wheel loading against bearing specifications.
Q: What material is SKU 6304-ZZ constructed from?
A: SKU 6304-ZZ uses high carbon chrome steel for rings and balls with a pressed steel cage for ball separation. This construction provides durability and corrosion resistance for manual pallet jack and low-speed material handling applications. The bearing is designed for contamination resistance through its metal shield design.
Q: How does SKU 6304-ZZ compare to the 6304-2RS bearing for manual pallet jacks?
A: SKU 6304-ZZ features metal shields (ZZ design) while 6304-2RS has rubber contact seals (2RS design). Metal shields offer lower friction and less drag but provide less contamination resistance than contact seals. For manual pallet jacks in standard warehouse conditions, both are suitable. For wet or wash-down environments, the 2RS seal design provides better protection.