Square Thread Form - Classification

Classification

Square threads are defined as follows by ISO standards:

where Sq designates a square thread, 60 is the nominal diameter in millimeters, and 9 is the pitch in millimeters. When there is no suffix it is a single start thread. If there is a suffix then the value after the multiplication sign is the lead and the value in the parentheses is the pitch. For example:

would denoted two starts, as the lead divided by the pitch is two. The "LH" denotes a left hand thread.