Typically they are 3 times the length of the inner diameter, but we can machine other sizes, just ask! We can manufacture these in a limited number of sizes with a square profile if needed - but these are extremely rare. We can make almost any combination of internal and external diameter or profile you're looking for within available material specifications and finishes. At times customers ask these to be partially threaded on each end, sometimes with mixed thread sizes, pitches and a combination of left hand on one side and right hand on the other. Typically these are known as reducing coupling nuts.
In addition to standard preferred sizes, we also manufacture non preferred sizes and non standard or special thread and nut forms.
Trojan special fasteners can build additional features into fasteners, like collars, castellated, slotted portions and also cross drill and tap these: