Conventional machine bearings such as the one in this picture have to be lubricated with grease, oil, or similar lubricants. In contrast, sleeve bearings made of PTFE materials do not need oiling – they come with an integrated lubricant.

A conventional machine bearing, dismounted and presented on a table — Conventional machine bearings such as the one in this picture have to be lubricated with grease, oil, or similar lubricants. In contrast, sleeve bearings made of PTFE materials do not need oiling – they come with an integrated lubricant. © Adobe Stock / saelim