Is that a nut? If so, then you aren't taking into account the thread in the nut, which will be 17mm when factored in.
EDIT: Okay, I have a bit of a hang over, and I realized what I said made no sense... disregard.
“The modern astrophysical concept that ascribes the sun’s energy to thermonuclear reactions deep in the solar interior is contradicted by nearly every observable aspect of the sun.” —Ralph E. Juergens
Last edited by zeropointbug; 08.08.2009 at 02:36 PM.