02-05-2020, 07:07 PM
Renaud,
A bolt has a threaded portion at the bottom, followed by a plain shank up to the head., unlike a setpin, which is threaded all the way up its length.
A bolt " bottoms out" when one puts a nut on the reaches the end of the threaded portion without putting any tension on whatever the bolt passes through.
Hope this helps (and no, you are not a 'silly frog' - English is the most awkward of languages with lots of obscure idioms!)
A bolt has a threaded portion at the bottom, followed by a plain shank up to the head., unlike a setpin, which is threaded all the way up its length.
A bolt " bottoms out" when one puts a nut on the reaches the end of the threaded portion without putting any tension on whatever the bolt passes through.
Hope this helps (and no, you are not a 'silly frog' - English is the most awkward of languages with lots of obscure idioms!)