The Stieber GFR Ø12 mm is a miniature, high-speed roller-type freewheel designed for precision and compact integration in modular drive systems. It supports up to 4000 rpm on the inner race and 7200 rpm on the outer race, making it ideal for fast overrunning or backstop applications. Despite its size, it transmits up to 55 Nm of torque and is bolted via 3 mounting holes.

This unit is part of Stieber’s modular system and utilizes two 160-series ball bearings. It requires external oil lubrication and must be installed without axial load on the bearings. The plain outer race is designed for H7 bore fits, and torque is transmitted via bolts through the cover plate. Two paper seals are included to ensure proper sealing.

Technical Specifications:

• Shaft diameter: Ø12 mm

• Overrunning speed (imax): 4000 rpm

• amax (outer race): 7200 rpm

• Max torque: 55 Nm

• Bolt holes: 3

• Material: Steel

• Lubrication: Oil (external)

• Outer race: Plain, H7 fit

• Support: 2 x 160-series ball bearings (non-axially loaded)

Applications:

• Miniature indexing systems

• High-speed modular powertrains

• Overrunning or backstop systems in compact assemblies