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Knuckle thread
Knuckle threads are an unusual highly rounded thread form. The large space between the rounded crests and roots provides space for debris to be shifted to not interfere with the thread, making this form resistant to debris and thread damage.〔(【引用サイトリンク】 Knuckle threads )〕
== Standards ==
Knuckle threads with a flat 30 degree flank thread angle are standardized in DIN 405 for inch pitches and diameters ranging from 8mm to 200mm. A more recent standard DIN 20400 uses metric thread pitch and lists diameters from 10mm to 300mm. As DIN is a German organization, many instances of the DIN thread charts〔(【引用サイトリンク】 title=Thread Data Charts )〕 write numbers with a comma as the decimal point. For a thread pitch ''p'', the crest and root rounding radius is slightly less than ''p/4'', and approximately the middle third of each thread flank is flat.
The American Petroleum Institute (API) specification 5B〔(【引用サイトリンク】 title=API Specifications )〕 lists a "round thread" for tubing, often referred to as "8 round" or "8rd" for 8 threads per inch. The only other pitch listed is 10 threads per inch. The thread angle at the flank is 60 degrees, and the crest and root rounding radius is approximately ''p/6'' for threads of pitch ''p''. Both the thread angle and rounding radius are more like ordinary ISO threads than DIN. For 0.125 inch thread pitch (8 threads per inch), the API round thread root radius is 0.017 inch, and the crest radius is 0.020 inch. API threads taper at 3/4 inch of diameter per foot of length.
Many knuckle threads follow neither the DIN nor API standards, and are custom designed and fabricated for the particular application.
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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