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United States Standard thread
United States Standard thread (USS thread), also known as Sellers Standard thread, Franklin Institute thread〔 and American Standard thread,〔(【引用サイトリンク】 url = http://www.sizes.com/tools/thread_history.htm )〕 is a standard for inch based threaded fasteners and washers.
The USS standard is no longer supported. It, together with the SAE fastener standard, was incorporated into the Unified Thread Standard. However, the term, ''USS'', continues to be used occasionally today to describe inch based threaded fasteners with a coarse thread pitch and inch based washers that are a little bit larger than the corresponding SAE washer. The Unified Thread Standard uses the term UNC (Unified National Coarse) to describe a fastener that previously would have been designated USS and the Unified Thread Standard uses the term UNF (Unified National Fine) to describe a fastener that would have previously been designated SAE.
==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 inch screws and larger, the pitch is defined as:
:
where P is the pitch and D is the diameter of the rough stock.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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