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SKF
Deep Groove Ball Bearings SKF 6309 -Z/C3
- Technical data
- Inner diameter
- 45 mm
- Outer diameter
- 100 mm
- Width
- 25 mm
- Material
- Standard bearing steel
- Ball rows
- Single row bearing
- Seal
- Cover on one side
- Cage
- Sheet steel cage
- Clearance
- Slightly increased radial clearance
- Running accuracy
- Tolerance class P0/PN2 / ABEC 1
- Current insulation
- No current insulation
- Bore
- Cylindrical bore
- Outer ring
- Without flange/groove
- Material of rolling elements
- Standard bearing steel
- Temperature range
- -20 to +150 °C
- Weight
- 0,822 kg
| Scale quantity | Your discount | Unit price |
|---|---|---|
| 25 | 1,37 € | 26,02 € |
| 35 | 2,74 € | 24,65 € |
Deep Groove Ball Bearings SKF 6309 -Z/C3
The SKF 6309 -Z/C3 deep groove ball bearing combines a 45 mm bore diameter, a single-sided Z-type cover and increased C3 radial clearance for thermally demanding industrial applications.
The SKF 6309 -Z/C3 single-row deep groove ball bearing is designed primarily to support radial loads as well as moderate axial forces in both directions. With key dimensions of a 45 mm bore, 100 mm outside diameter and 25 mm width, this variant belongs to the 6309 series. It is manufactured from standard rolling-element bearing steel 100Cr6 and has a tolerance class of Normal (P0/PN or ABEC 1), ensuring dimensional stability and concentricity. Thanks to the open design on the opposite side, lubricant can be precisely replenished from the outside.
What is the 6309 -Z/C3 deep groove ball bearing suitable for in industrial applications?
This radial deep-groove ball bearing is well-suited to shaft mountings in general mechanical engineering where one-sided protection against coarse foreign particles is required. Thanks to the cylindrical outer ring without a flange or groove, the component sits flush within the corresponding housing bores. The design supports applications with a continuous supply of lubricant via the open bearing side. Designers primarily use this variant where housing walls or internal lubrication chambers already shield one side of the bearing.
What advantages do the Z cover plate and C3 clearance offer when selecting bearings?
The designation ‘Z’ stands for a sheet steel cover plate pressed in on one side, which forms a non-contact gap seal. This keeps frictional resistance low whilst protecting the bearing interior from dirt particles. The additional designation C3 indicates an increased radial bearing clearance. This increased clearance between the rolling elements and raceways compensates for thermal expansion at operating temperatures between –20 and +150 degrees. Furthermore, the increased bearing clearance counteracts stress caused by tight fits on the shaft and housing.
What are the dimensions of the 6309 -Z/C3 deep-groove ball bearing?
With an internal diameter of 45 mm, an external diameter of 100 mm and a width of 25 mm, the bearing complies with standardised mounting dimensions for 45-mm shafts. The outer ring is cylindrical in design and has no flanges or ring grooves.
What does the ‘Z’ designation mean for the 6309 deep-groove ball bearing?
The suffix ‘Z’ indicates a single-sided cover comprising a non-contact cover plate made of profiled sheet steel. It keeps coarser particles away from the rolling elements without generating any additional friction or heat. The open rear side also allows lubricant to flow freely within the housing.
Why is a C3 clearance selected for the 6309 -Z/C3 deep-groove ball bearing?
The designation C3 indicates a radial clearance that is slightly greater than that of the standard version. It is recommended where there are temperature differences between the inner and outer rings, and in the case of tight press fits. The additional radial clearance ensures that the rolling bearing continues to run smoothly even when heated during operation and is protected against radial stress.
What is the operating temperature range of the bearing?
This version is designed for an operating temperature range of -20 to +150 degrees Celsius. Both the raceways, made from 100Cr6 rolling bearing steel, and the sheet steel cage and metal cover plate can withstand these temperatures during operation. When designing the bearing, the thermal load capacity of the lubricant used must be taken into account.
What type of cage is fitted in the 6309 -Z/C3 deep-groove ball bearing?
Inside, a stamped sheet steel cage maintains a uniform spacing between the rolling elements, which are arranged in a single row. This type of cage is characterised by its low weight and resistance to lubricants. It allows for high rotational speeds and is unaffected by common industrial oils and greases.
What is the difference between a Z and a 2Z version?
A version with the designation ‘Z’ has only a single cover plate, whilst a ‘2Z’ variant is sealed on both sides. The single-side-sealed deep-groove ball bearing 6309 -Z/C3 is suitable for applications where lubricating oil is to enter the bearing from one side of the machine, whilst the outer side remains protected against the ingress of dirt.
SKF Group
Sven Wingquists Gata 2, 415 50 Gothenburg, Sweden
info@skf.com, https://www.skf.com/uk/footer/site-ownership
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