Effective Nut Radius
The radius from the centre of the nut to the point where the contact forces, generated when the nut is turned, can be considered to act.

Direct Tension Indicators
Direct Tension Indicators (DTI's) is a term sometimes used to describe load indicating washers.

Projections on the face of the washer (usually on the face abuting the bolt head or nut) that deform under loading as the bolt is tensioned.

An indication of the tension in the bolt can be made by measuring the gap between the washer face and the nut or bolt head.

The smaller the gap - the greater the tension in the bolt. Commonly used in civil rather than mechanical engineering applications.

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Effective diameter
It is the diameter of an imaginary cylinder coaxial with the thread, which has equal metal and space widths and often referred to as pitch diameter. Sometimes referred to as the simple effective diameter to differentiate from the virtual effective diameter.