United States Standard Thread - Thread Form

Thread Form

The thread form is defined by flats at the tip and root of the thread form. This flat length is defined as the pitch divided by eight. The thread depth, which is from flat to flat is 0.6495 times the pitch. For 1⁄4 inch screws and larger, the pitch is defined as:

where P is the pitch and D is the diameter of the rough stock.

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