Exam 22: Screw Thread Specifications

The major diameter is the smallest diameter of the thread for a screw or a nut.

An imaginary cylinder that passes through the threads at a point where the width of the thread and the width of the groove are equal is the:

A screw thread is a ridge of uniform section in the form of a helix on the external or internal surface of a cylinder or hole.

The major diameter is also called the:

For most screw, bolt, and nut applications you would use:

The distance from the root to the crest of the thread is:

The letters A and B are used in the Unified Inch Screw Thread Series. For internal threads, the letter A is used.

For Unified Inch Series screw threads, a Class 1A provides a looser fit than a Class 3A.

Threads that are very strong and are used to transmit power and motion in either direction are:

Threads that are designed to handle extreme weight and to transmit power in one direction are: