The SKF 6310-2RS1/C3 is a single row deep groove ball bearing with a 50 mm bore, 110 mm outside diameter and 27 mm width, fitted with a contact rubber seal on both sides (2RS1) and C3 radial internal clearance. It belongs to the SKF Explorer performance class and, per SKF, carries a basic dynamic load rating of 65 kN and a basic static load rating of 38 kN.
The designation can be read directly: 6 = single row deep groove ball bearing, 3 = ISO dimension series 03 (medium), a heavier cross-section with larger balls for higher loads on the same shaft size; 10 = bore code for 50 mm (10 x 5); 2RS1 = contact seals on both sides; C3 = radial internal clearance greater than normal.
The contact seals rub lightly on the inner ring, which keeps grease in and dust, water and washdown spray out better than a shield. The price of that protection is speed: SKF lists a limiting speed of 4,300 r/min for this sealed version, against 6,700 r/min for the shielded 6310-2Z/C3.
Technical data
| SKF designation | 6310-2RS1/C3 |
|---|---|
| Bearing type | Single row deep groove ball bearing |
| Dimension series | 63 – ISO dimension series 03 (medium) |
| Bore diameter (d) | 50 mm |
| Outside diameter (D) | 110 mm |
| Width (B) | 27 mm |
| Basic dynamic load rating (C) | 65 kN |
| Basic static load rating (C0) | 38 kN |
| Limiting speed | 4,300 r/min |
| SKF performance class | SKF Explorer |
| Sealing | Seal on both sides (contact) |
| Radial internal clearance | C3 (greater than normal) |
| Cage | Sheet metal (pressed steel) |
| Bore type | Cylindrical |
| Lubricant | Grease, no relubrication feature |
| Material | Bearing steel |
| Net weight | 1.08 kg |
| Condition | New, original SKF |
Typical applications
- Heavier electric motors and generators
- Construction and quarry equipment auxiliaries
- Agricultural and food-processing machinery that is washed down
- Idlers, pulleys and tensioners
- Like-for-like replacement of a worn SKF 6310-2RS1/C3
Compatibility and replacement
Every 6310 bearing made to ISO 15 has the same 50 x 110 x 27 mm boundary dimensions, so this bearing fits wherever a 6310 with contact seals and C3 clearance from another maker was used. Suffixes differ between brands: shields are often marked ZZ or 2Z, contact seals 2RS, 2RS1, DDU or LLU, and the clearance C3 may appear as “C3” or “/C3”. Always match the sealing arrangement and the clearance class shown on the old bearing; if your machine needs the other closure, the 6310-2Z/C3 is the same size.
Frequently asked questions
What is the difference between 6310-2RS1/C3 and 6310-2Z/C3?
Only the closures. The 6310-2Z has non-contact steel shields; the 2RS1 version has contact rubber seals. Per SKF, the limiting speed is 6,700 r/min for 2Z and 4,300 r/min for 2RS1; the load ratings are the same. Choose shields for speed and low friction, seals for dirt and moisture.
What does C3 mean, and can I use a bearing without it?
C3 is a radial internal clearance greater than normal. It leaves room for the inner ring to expand with a tight shaft fit or with heat, which is why electric motors and hot-running machines often specify it. Fit the clearance class the machine maker specifies or that is marked on the old bearing; do not swap C3 for normal clearance without checking.
Which shaft and housing does it fit?
A 50 mm shaft seat and a 110 mm housing bore, with 27 mm of axial space. The exact fit tolerances depend on the load and on which ring rotates, so follow the machine drawing or the old bearing seat.
Related parts
- SKF 6310-2Z/C3 (shielded version)
- SKF 6309-2RS1/C3 (45 mm bore)
- SKF 6311-2RS1/C3 (55 mm bore)
- All SKF 6300 Series Bearings
Part of the SKF 6300 series stocked by RendatSP for electric motors, gearboxes, pumps, fans, conveyors and general industrial machinery, with fast shipping to Iraq, Saudi Arabia, UAE, Egypt, Yemen, Libya and across the Middle East and Africa.
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