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Special-purpose coupling

A flexible coupling designed and manufactured for a specific application. It must operate under special conditions (high torques, angles, axial or speed) or is required to operate continuously for extended periods. Special-purpose couplings are critical to the continued operation of the installation.


Spline bore

A series of parallel keyways formed internal with the bore and mating with the corresponding grooves cut in a shaft. Splined hubs and shafts are used when relatively heavy torques are to be transmitted. The most common splines conform to standards published by SAE and ANSI and are in the form of involutes or straight, parallel sides


Static unbalance

That condition of unbalance in which the central principal axis of inertia is displaced only parallel to the shaft axis.


Service factor (S.F.) (Application factor)

A factor that accounts for unusual and occasional loading.


Shaft penetration factor

The percentage of the shaft length within the confines of the hub that is, for the purpose of calculating torsional rigidity, assumed to be free from restraint at the shaft/hub interface.


Shear elastomeric coupling

A coupling that transmiter torque through an elastomeric element that is principally loaded in shear. The element may be in the form of a type, a bellows (with one or more convolutions), or a diaphragm. A single elastomeric element is usually able to accommodate angular misalignment, parallel offset, and axial displacement.


Single-engagement (single flex) coupling

A coupling that has only one flexing plane. This type of coupling can accommodate angular misalignment and axial displacement. Certain types of singleengagement couplings can also accommodate offset misalignment.


Sliding block coupling

A coupling that consists of two jawed (slotted) hubs engaged with a mating center member. (“Sliding block” is the preferred term for what was formerly called an Oldham coupling.)


Stress Relieving

Heating to a suitable temperature, holding long enough to reduce residual stresses, and then cooling slowly enough to minimize the development of new residual stresses.


Subcritical Annealing

A process anneal performed on ferrous alloys at a temperature below Ac1.


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