What type of key allows the hub to move along the shaft but prevents the rotation of the shaft?

• A. Woodruff key
• B. Feather key
• C. Gibbs key
• D. Square key

Answer: (B)

A feather key is a specific type of key that facilitates movement along the shaft while preventing rotational movement. This design features a rectangular cross-section that allows for a sliding fit within the hub but remains fixed within a machined keyway on the shaft. This mechanism enables the hub to slide back and forth as needed, accommodating for axial movement without allowing it to rotate relative to the shaft.

In many applications, this is essential where parts must be aligned along a line but also need the ability to move. This functionality makes feather keys popular in various mechanical systems where controlled sliding motion is required without compromising rotational stability.