Model F keyboard

[2][3] After the introduction of the Model M keyboard, production was ramped down and eventually limited to replacement units for existing installations.

Since 2016 a project has been underway to manufacture for sale keyboards with a faithful re-creation of the model F mechanism, completely independently of IBM.

The Model F's key-switch design was more durable than IBM's previous beam-spring mechanism, which was prone to failure from debris and was more complex to manufacture and service.

[13] The spring assembly consisted of a top metal plate with cut holes where the plastic spring barrels reside; a bottom sheet of metal then holds the assembly together and compresses the contact sheet with a foam spacer.

Earlier Model F keyboards cannot have their space bars removed without disassembling the internal assembly; this also causes a slightly different feel response from the space bar specifically: some enthusiasts modify the tension of the stabilizer on these early Model F keyboards to provide a more satisfactory response.

Model F capacitive pads from an opened assembly
Corrosion occurring on a Model F 122 terminal keyboard along with dust
A comparison between a Model F spring (left) and a Model M spring (right); the Model M uses a spring with fewer windings and smaller plate for the plastic membrane underneath.