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Brand: SKF
SKF 6309-2Z/C3 Shielded Deep Groove Ball Bearing, 45 mm
Description
A shielded 45 mm bore deep groove bearing with extra clearance for motors and pumps
The SKF 6309-2Z/C3 is a single row deep groove ball bearing of the 63 series with a 45 mm bore, 100 mm outside diameter and 25 mm width, fitted with non-contact metal shields on both sides and with C3 radial internal clearance. The 63 series is the heavier section of the two standard deep groove series and is widely used on the drive end of medium size electric motors, in pumps, fans, gearboxes and conveyor drives. It carries radial load and axial load in both directions, is easy to mount and needs little maintenance.
The shields keep the factory grease in and larger debris out without adding seal friction, so the bearing keeps the high-speed capability of the open type: the reference speed is 15,000 r/min and the limiting speed 7,500 r/min. SKF lists it in the Explorer class, made to ISO tolerance class 6 widths and with SKF-specified steel.
Technical specifications
| Parameter | Specification |
|---|---|
| Designation | 6309-2Z/C3, single row deep groove ball bearing, shielded both sides, C3 clearance |
| 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 |
| Fatigue load limit Pu | 1.34 kN (catalogue, 6309) |
| Reference speed | 15,000 r/min |
| Limiting speed | 7,500 r/min |
| SKF performance class | SKF Explorer |
| Shields | Non-contact shields on both sides (2Z) |
| Radial internal clearance | C3 (greater than Normal) |
| Cage | Sheet metal |
| Lubricant | Grease, no relubrication feature |
| Filling slots | Without |
| Mass | 0.85 kg |
Neighbouring 63 series sizes
For comparison, the table lists the open 63 series bearings from the SKF catalogue around the 6309. Ratings are for the open bearing; the shielded variant carries the same C and C0 on the SKF product page, but its speed rating differs as shown above.
| Open designation | d mm | D mm | B mm | C kN | C0 kN | Reference speed r/min | Limiting speed r/min | Mass kg |
|---|---|---|---|---|---|---|---|---|
| 6306 | 30 | 72 | 19 | 29.6 | 16.0 | 20,000 | 13,000 | 0.35 |
| 6307 | 35 | 80 | 21 | 35.1 | 19.0 | 19,000 | 12,000 | 0.46 |
| 6308 | 40 | 90 | 23 | 42.3 | 24.0 | 17,000 | 11,000 | 0.63 |
| 6309 | 45 | 100 | 25 | 55.3 | 31.5 | 15,000 | 9,500 | 0.84 |
| 6310 | 50 | 110 | 27 | 65.0 | 38.0 | 13,000 | 8,500 | 1.08 |
| 6311 | 55 | 120 | 29 | 74.1 | 45.0 | 12,000 | 8,000 | 1.37 |
| 6312 | 60 | 130 | 31 | 85.2 | 52.0 | 11,000 | 7,000 | 1.72 |
Selection: shields, seals and clearance
The suffix 2Z means a shield on both sides, which suits clean to moderately dusty conditions and high speed. For wet or heavily contaminated sites SKF offers contact seals such as 2RS1, which keep grease in and water out better but run at a lower speed, and low-friction seals; see the SKF 6206-2RS1 for a sealed 62 series example. The C3 suffix means radial internal clearance greater than Normal, which is chosen when the inner ring runs warmer than the outer ring, when the shaft has a heavy interference fit, or in electric motors that run hot. Do not mix up clearance classes when replacing a bearing, because a C3 bearing used in place of a Normal one changes noise, temperature and life.
Because standard deep groove bearings are not electrically insulated, ask about insulated or hybrid variants if the motor is fed by a variable frequency drive. Before ordering, confirm the shield or seal type, clearance class, grease and cage, and the operating temperature. All ball bearings on this site are grouped under Ball Bearings.
Related SKF products: SKF 6205-2RSH/C3 Sealed Deep Groove Ball Bearing, SKF 6206-2RS1 Deep Groove Ball Bearing, SKF 6314 Deep Groove Ball Bearing, 70x150x35 mm, SKF 6208/HC5C3 Hybrid Ceramic Deep Groove Ball Bearing, SKF 6212-2Z/VA228 High Temperature Ball Bearing and SKF 7312 BECBM Angular Contact Ball Bearing, 60 mm.
Documents and ordering
The attached document is the SKF Explorer deep groove ball bearings brochure, which explains the seal and shield options, cage designs and greases for the whole range; the ratings and dimensions above are from the SKF product page for the exact designation and from the SKF catalogue table for the 6309. Send the full designation 6309-2Z/C3 with quantity. Seven Star LLC is an independent supplier in Muscat; availability and lead time are confirmed per enquiry.
Datasheets & Documents
- Datasheet SKF Explorer deep groove ball bearings brochure (series features, seals, cages, greases) Download
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About brand
SKF is the Swedish bearing manufacturer founded in Gothenburg in 1907. The company was built on the self-aligning ball bearing developed by engineer Sven Wingquist, who became its first managing director. Today SKF also makes seals, lubrication systems, condition monitoring equipment and maintenance tools.
Seven Star LLC is an independent supplier in Muscat. We list SKF bearings, greases, automatic lubricators, condition monitoring sensors and maintenance tools, and supply them to maintenance teams in Oman and the GCC by designation.
SKF company profile
| Established | 1907, Gothenburg, Sweden; first factory built in 1908 |
|---|---|
| Founding product | Sven Wingquist's self-aligning ball bearing |
| Name | From Svenska Kullagerfabriken, Swedish for "Swedish Ball Bearing Factory" |
| Product families | Rolling bearings, seals, lubricants and lubrication systems, condition monitoring sensors and analysers, and maintenance tools for mounting, alignment and dismounting |
Milestones
- 1907: Sven Wingquist's self-aligning ball bearing is patented and SKF is founded in Gothenburg.
- 1908: The first factory is built.
- 1912: SKF is represented in 32 countries.
- 1926: SKF sets up AB Volvo as a subsidiary to build cars; the first production car follows in 1927.
- 1935: Volvo becomes an independent company.
SKF products we list
| Family | Models | Typical use |
|---|---|---|
| Bearings | 6205-2RSH/C3, 6206-2RS1, 6314, 7312 BECBM | Motors, pumps, fans and gearboxes |
| Greases | LGMT 2, LGMT 3, LGEP 2, LGWA 2, LGHP 2, LGHB 2, LGEV 2 | General, heavy-load, high-temperature and slow-speed bearing lubrication |
| Automatic lubrication | TLSD, LAGD 125 (ATEX), TLMR, TLMP 1008, TLGH 1 grease gun | Steady greasing of hard-to-reach or many lubrication points |
| Condition monitoring | Microlog Analyzer AX, CMSS 2200, CMSS 793-EE (ATEX), TKRS 21 stroboscope, TKRT 31 tachometer | Vibration routes, permanent sensors and speed checks |
| Alignment | TKSA 41 shaft alignment, TKBA 40 belt alignment, TMAS shims | Laser alignment of couplings and belt drives |
| Mounting and dismounting | TIH 030m, TIH 100m, TIH 220m heaters, TMFT 36, TMMA 75H, TMMP 10, TMHP 30/170 pullers, TMJL 100 pump | Fitting and removing bearings without damage |
An SKF designation describes the bearing exactly. In 6205-2RSH/C3, "62" is a light-series deep groove ball bearing, "05" means a 25 mm bore (05 × 5), "2RSH" means rubber seals on both sides, and "C3" means internal clearance larger than normal, which motors often need because the inner ring runs warmer than the outer. Choosing the right grease matters just as much: a general grease such as LGMT 2 suits most motors, while heavy loads, high temperatures or slow speeds need an EP, high-temperature or high-viscosity grade.
Where SKF products are used
In Oman and the GCC, SKF bearings, lubricants and tools are used by maintenance teams in oil and gas, power and desalination, cement, mining, steel, water and food plants, and by motor and pump repair workshops.
Ordering SKF products: what we need
Send the full bearing designation including all suffixes (seals, clearance, cage), and the quantity. For greases, send the grade and pack size. For tools and lubricators, send the model and, for heaters, the largest bearing weight and bore you need to heat.
Facts checked against SKF company history, October 2026.
Browse SKF products by category: Electromotors.
FAQ
Questions about the SKF 6309-2Z/C3 Shielded Deep Groove Ball Bearing,
Answers from our engineering team on installation, compatibility and integration.
01What does 6309-2Z/C3 mean?
6 is a single row deep groove ball bearing, 3 the 63 series, 09 the 45 mm bore, 2Z a shield on both sides and C3 radial clearance greater than Normal.
02What are the dimensions and ratings?
Bore 45 mm, outside diameter 100 mm, width 25 mm, dynamic rating 55.3 kN and static rating 31.5 kN.
03What is the difference between 2Z and 2RS1?
2Z is a non-contact shield, which allows higher speed; 2RS1 is a contact seal that gives better protection but a lower speed limit.
04What speed can the 6309-2Z/C3 run at?
The SKF product page lists a reference speed of 15,000 r/min and a limiting speed of 7,500 r/min.
05Is Seven Star LLC a distributor of SKF?
No, Seven Star LLC is an independent supplier in Muscat that quotes against the designation you provide.
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