The SKF 6309-2RS1/C3 is a single row deep groove ball bearing with a 45 mm bore, 100 mm outside diameter and 25 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 55.3 kN and a basic static load rating of 31.5 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; 09 = bore code for 45 mm (09 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 4,500 r/min for this sealed version, against 7,500 r/min for the shielded 6309-2Z/C3.
Technical data
| SKF designation | 6309-2RS1/C3 |
|---|---|
| Bearing type | Single row deep groove ball bearing |
| Dimension series | 63 – ISO dimension series 03 (medium) |
| Bore diameter (d) | 45 mm |
| Outside diameter (D) | 100 mm |
| Width (B) | 25 mm |
| Basic dynamic load rating (C) | 55.3 kN |
| Basic static load rating (C0) | 31.5 kN |
| Limiting speed | 4,500 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 | 0.841 kg |
| Condition | New, original SKF |
Typical applications
- Industrial gearboxes and drive trains
- Pumps and mixers in damp or dusty plant rooms
- Textile, packaging and bottling machines
- Agricultural and food-processing machinery that is washed down
- Like-for-like replacement of a worn SKF 6309-2RS1/C3
Compatibility and replacement
Every 6309 bearing made to ISO 15 has the same 45 x 100 x 25 mm boundary dimensions, so this bearing fits wherever a 6309 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 6309-2Z/C3 is the same size.
Frequently asked questions
What is the difference between 6309-2RS1/C3 and 6309-2Z/C3?
Only the closures. The 6309-2Z has non-contact steel shields; the 2RS1 version has contact rubber seals. Per SKF, the limiting speed is 7,500 r/min for 2Z and 4,500 r/min for 2RS1; the load ratings are the same. Choose shields for speed and low friction, seals for dirt and moisture.
Does the 6309-2RS1/C3 need greasing?
No. Per SKF it is supplied filled with grease and has no relubrication feature, so it is mounted as delivered and not washed out. Net weight per SKF is 0.841 kg.
Is it the same as a 6309ZZ or 6309-2RS from another brand?
Dimensionally yes: all 6309 bearings share 45 x 100 x 25 mm under ISO 15. A ZZ marking corresponds to the 2Z shielded design and 2RS to this sealed design; load ratings and speeds differ between makers, and the figures on this page are the SKF values.
Related parts
- SKF 6309-2Z/C3 (shielded version)
- SKF 6308-2RS1/C3 (40 mm bore)
- SKF 6310-2RS1/C3 (50 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.
Every part RendatSP supplies is new and original, carries a 1-year warranty and ships worldwide by air in 5 to 7 days once ready (shipping, payment and warranty). Send us the part number and quantity on WhatsApp or through the inquiry form and we will quote the same working day. Agents in Saudi Arabia, Iraq, the UAE, Egypt, Oman, Libya, Morocco, Mauritania, Yemen, Algeria and Jordan.
