Deep Groove Ball Bearing - 35MM Bore
6307-2RS-C3
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Product Description
6307-2RS-C3 is a deep groove ball bearing, 35 mm bore x 80 mm outside diameter x 21 mm width, with double rubber contact seals and C3 internal clearance, commonly used in manual pallet jack bearing assemblies and compatible with multiple cross-reference part numbers from major bearing manufacturers.
Specifications
Dimensions
| Outside Diameter | 80 mm |
| Width | 21 mm |
| Internal Clearance | C3 |
Material Specifications
| Seal Material | Nitrile Butadiene Rubber (NBR) with steel reinforcement |
| Cage Material | Steel |
Part Numbers
| Primary Part Number | 6307-2RS-C3 |
| Cross-Reference Part Numbers | 6307ZZ-C3 (shielded variant), 6307-C3 (open variant), universal across SKF, Timken, Koyo, NSK, PFI, NTN, FAG brands |
Application
| Operating Temperature Range | -10°C to +60°C (nitrile seal limits) |
Frequently Asked Questions
Q: What does C3 internal clearance mean and when should I use the 6307-2RS-C3?
A: C3 denotes increased internal clearance between the rolling elements and races. The 6307-2RS-C3 is specified for applications with high operating speeds, high temperatures, or where thermal expansion may occur. For standard manual pallet jack operation at room temperature and moderate speeds, the standard 6307-2RS is typically sufficient. Use C3 if your equipment operates in heated environments (hot storage, near processing lines) or if OEM documentation specifies C3.
Q: What are the dimensions and seal specifications of the 6307-2RS-C3?
A: The 6307-2RS-C3 maintains the same physical dimensions as the standard 6307-2RS: 35 mm bore, 80 mm outer diameter, and 21 mm width. The difference is the C3 internal clearance. It features double nitrile rubber contact seals, AISI 52100 bearing steel, and a steel cage. The increased clearance allows for higher operating speeds and thermal expansion without preload changes.
Q: What cross-reference and equivalent part numbers exist for the 6307-2RS-C3?
A: The 6307-2RS-C3 is universal across SKF, Timken, Koyo, NSK, PFI, NTN, and FAG brands. Related variants include 6307ZZ-C3 (shielded version with C3 clearance) and 6307-C3 (open bearing with C3 clearance). When ordering, always specify the C3 designation to ensure correct clearance class for your application.
Q: Is the 6307-2RS-C3 compatible with equipment designed for the standard 6307-2RS?
A: Yes, the 6307-2RS-C3 is a direct physical replacement for the standard 6307-2RS due to identical outer dimensions and bore. It fits manual pallet jacks and other material handling equipment from Crown, Toyota, Raymond, Yale, Hyster, and similar manufacturers. The C3 clearance will not harm standard-clearance applications, though it offers no additional benefit if thermal conditions remain moderate.
Q: How does material composition affect bearing reliability in wet or cold storage environments?
A: The 6307-2RS-C3 uses AISI 52100 bearing steel (equivalent to DIN 100Cr6, JIS SUJ2, ISO 683-17), which resists corrosion but is not stainless. The nitrile rubber seals provide contamination protection. In cold storage (below 0C) or wet dock environments, operate within seal and lubricant temperature limits (typically minus 10C to plus 60C for nitrile seals). Below these limits, seal effectiveness diminishes and corrosion risk increases; consider stainless bearing variants if extended cold storage exposure is expected.