12 NUT = JAM NUT. Named differently, but basically the same. Usually, two of these nuts are used together as a 'locking nut'. Very effective, and used before the advent of Nylocks etc. In this example, the half nut is also oversized 'across the flats', so could also be considered a 'wide nut'.WIDE NUT. These are made for special applications, and are usually made from hex bar the next largest size.
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Jon Caswell (British Tools & Fasteners, LLC)
7696 State Route 31
Lyons, NY, United States
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