The SKF 6312-2RS1/C3 is a single row deep groove ball bearing with a 60 mm bore, 130 mm outside diameter and 31 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 85.2 kN and a basic static load rating of 52 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; 12 = bore code for 60 mm (12 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 3,400 r/min for this sealed version, against 5,600 r/min for the shielded 6312-2Z/C3.
Technical data
| SKF designation | 6312-2RS1/C3 |
|---|---|
| Bearing type | Single row deep groove ball bearing |
| Dimension series | 63 – ISO dimension series 03 (medium) |
| Bore diameter (d) | 60 mm |
| Outside diameter (D) | 130 mm |
| Width (B) | 31 mm |
| Basic dynamic load rating (C) | 85.2 kN |
| Basic static load rating (C0) | 52 kN |
| Reference speed | 11,000 r/min |
| Limiting speed | 3,400 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 | 1.72 kg |
| Condition | New, original SKF |
Typical applications
- Industrial gearboxes and drive trains
- Construction and quarry equipment auxiliaries
- Textile, packaging and bottling machines
- Pumps and mixers in damp or dusty plant rooms
- Like-for-like replacement of a worn SKF 6312-2RS1/C3
Compatibility and replacement
Every 6312 bearing made to ISO 15 has the same 60 x 130 x 31 mm boundary dimensions, so this bearing fits wherever a 6312 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 6312-2Z/C3 is the same size.
Frequently asked questions
What is the difference between 6312-2RS1/C3 and 6312-2Z/C3?
Only the closures. The 6312-2Z has non-contact steel shields; the 2RS1 version has contact rubber seals. Per SKF, the limiting speed is 5,600 r/min for 2Z and 3,400 r/min for 2RS1; the load ratings are the same. Choose shields for speed and low friction, seals for dirt and moisture.
Does the 6312-2RS1/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 1.72 kg.
Is it the same as a 6312ZZ or 6312-2RS from another brand?
Dimensionally yes: all 6312 bearings share 60 x 130 x 31 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 6312-2Z/C3 (shielded version)
- SKF 6311-2RS1/C3 (55 mm bore)
- SKF 6313-2RS1/C3 (65 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.
