Deep Groove Ball Bearings SKF 6309 -Z

The SKF 6309-Z deep groove ball bearing, with dimensions of 45 × 100 × 25 mm, absorbs radial forces and provides protection against dirt particles on one side.

The SKF 6309-Z deep groove ball bearing is a single-row radial ball bearing made from 100Cr6 bearing steel. With an inner diameter of 45 mm and an outer diameter of 100 mm, the bearing transmits moderate to high radial forces as well as axial forces acting from both sides. A sheet steel cage guides the rolling elements evenly within the ground raceway. Thanks to its P0 tolerance class (ABEC 1), this roller bearing fits precisely into standardised housing bores and ensures low-vibration operation in industrial drive trains.

What is the 6309-Z deep groove ball bearing suitable for in industrial applications?

Maintenance engineers and designers prefer to use this design for bearing locations where one side of the housing is already supplied with lubricant. As the bearing is designed for operating temperatures ranging from -20 to +150 degrees, it can cope with demanding thermal conditions in processing machinery. The 45 mm cylindrical bore allows for direct mounting on smooth shaft seats without spacer sleeves.

What is the function of the single-sided Z cover plate on this rolling bearing?

The suffix ‘-Z’ denotes a non-contact gap seal made of sheet metal on one end face. This design keeps dirt and solid particles out from the outside, whilst the open opposite side allows for unimpeded lubricant exchange with the interior of the housing. With the standard radial bearing clearance, the operating clearance remains stable at normal operating temperatures without causing unwanted seizing or increased friction torque.