Deep Groove Ball Bearings SKF 6008 NR

The SKF 6008 NR deep groove ball bearing combines compact dimensions of 40 × 68 × 15 mm with a ring groove and retaining ring for easy axial fixing.

The 6008 NR deep groove ball bearing is a single-row radial ball bearing made from standard 100Cr6 rolling bearing steel, with an inner diameter of 40 mm, an outer diameter of 68 mm and a width of 15 mm. Manufactured in the SKF Explorer design and tolerance class P6 (ABEC 3), this component is characterised by high running accuracy. Designed as an open bearing, it allows free passage of lubricant through the oil or grease circuit of a structure. The standard radial clearance promotes low-vibration operation in rotating assemblies with standardised fit seats.

What is the 6008 NR deep groove ball bearing suitable for?

This bearing primarily accommodates radial forces as well as moderate axial loads in both directions. Designers use the version with a ring groove and snap ring particularly where axial installation space is limited. The integrated retaining ring provides axial fixation within the housing, meaning that additional housing shoulders or retaining rings are not required. This makes the variant suitable for designs where space-saving shaft mountings with defined housing positioning are required. The permissible temperature range is from –20 to +150 degrees Celsius.

What is the function of the ring groove and snap ring in this design?

The designation NR stands for a ring groove with an inserted snap ring in the outer ring of the bearing. This design feature enables a positive-lock axial retention directly in a matching groove in the bearing housing. This feature saves installation space and reduces the manufacturing effort required for housing covers or threaded rings. As this is an unsealed bearing, its use requires an external housing seal to protect against contamination, as well as a continuous supply of lubricant. The robust sheet steel cage guides the rolling elements during operation.