[TR] Help deciphering Standard Triumph hardware catalog vs. Triumph Spare Parts Catalog

[Randall]

The reason they have a 'special' part number (not in the standard hardware
catalog) is because they are a special fastener.  The unthreaded shank is
longer than usual, the threaded portion is shorter than usual.  If memory
serves, the shank is also larger than usual (full nominal size, rather than
the usual "easy fitting" undersize).

My suggestion is to buy the proper fastener from TRF et al.  More expensive,
but not nearly as expensive as ruining a flange (by having threads cut into
it).

Randall