The shape of the frame of thread snap gauge is in the form of :

Truncated

The shape of the thread in the NOT GO end of a thread snap gauge is truncated, which means length of NOT GO end is shorter than GO end.

Reducing the weight

The handle of thread plug gauge is made from ebonite material for reducing the weight of the gauge.

Square, Modified square, Acme, Buttress threads

Square, Modified square, Acme and Buttress thread groups are only for transmitting motion

Resisting force exerted in one direction only

Buttress threads are most commonly used for resisting force exerted in one direction only