The outside diameter of the threaded portion of a fastener measured from crest to crest is called the _____ diameter.

Question

Quizplus · Accepted Answer

The major diameter is the largest diameter of the threaded portion of the fastener and is measured from crest to crest. It is also known as the nominal diameter or thread diameter. The minor diameter is the smallest diameter of the threaded portion of the fastener and is measured from root to root. Right-hand and left-hand refer to the direction of the threads.

The Outside Diameter of the Threaded Portion of a Fastener