Product Description
The 6203DDU is a precision deep groove ball bearing assembly, equipped with double contact rubber seals for enhanced contaminant protection. Designed for manual pallet jack applications, it features a 17 mm bore, 40 mm outside diameter and 12 mm width, using pressed steel cage and high-carbon steel construction. Fully interchangeable with common cross-reference numbers including 6203-2RS, 6203LLU, and fits standard OEM and aftermarket manual pallet jack wheel and load assemblies.
Specifications
Material & Construction
| Ball Material | High carbon chromium steel (SAE 52100, equivalent to ISO 683-17) |
| Outer/Inner Ring Material | High carbon chromium steel, precision ground |
Part Numbers & Compatibility
| OEM Part Number | 6203DDU |
| Alternative Part Numbers | 6203-2RS, 6203DDU-C3, 90363-17025 (Toyota OEM cross), 6203LLU (NTN equivalent) |
| Equivalent / Interchange Part Numbers | NSK 6203DDU, NTN 6203LLU, KOYO 6203-2RS, FAG 6203-2RSR, SKF 6203-2RS1 |
Frequently Asked Questions
Q: What makes the 6203DDU different from standard 2RS sealed bearings?
A: The 6203DDU features double contact rubber seals (DDU designation) instead of standard rubber seals, providing enhanced contaminant protection. This design is ideal for manual pallet jacks used in damp, wet, or contaminated environments where extra seal contact prevents grease leakage and water ingress.
Q: What are the bore, outside diameter, and width specifications of the 6203DDU?
A: The 6203DDU has a 17 mm bore diameter, 40 mm outside diameter, and 12 mm width. These standard dimensions make it compatible with manual pallet jack wheel and load assemblies from Crown, Toyota, Raymond, and other OEM manufacturers using 17 mm shaft sizing.
Q: Is the 6203DDU interchangeable with 6203-2RS or other common cross-references?
A: Yes, the 6203DDU is fully interchangeable with 6203-2RS, 6203LLU, and equivalent bearings from brands like NSK, NTN, KOYO, FAG, and SKF. Toyota OEM cross-reference 90363-17025 also fits. Verify that the C3 clearance grade and seal type match your original bearing before installation.
Q: What material and cage construction does the 6203DDU use?
A: The 6203DDU uses high carbon chromium steel balls (SAE 52100 equivalent) and a pressed steel cage. This combination delivers high load capacity and durability while maintaining cost-effectiveness for industrial manual pallet jack applications.
Q: How do I know if a 6203DDU bearing needs replacement?
A: Signs of bearing failure include audible grinding or rattling when pushing the pallet jack, reduced wheel rotation, increased steering effort, or wobbling wheels. Check for grease leakage around the seal. If double contact seals are compromised, replace the bearing promptly to prevent water and contaminant damage.