[TR] A question regariding the Hardware Catalogue Used by Standard Triumph Vehicles.

[sujit roy]

For people who have this catalogue, can someone please tell me what the
difference is between a BOLT - HEXAGON HEAD and  SETSCREW - HEXAGON HEAD?
Let's take an example, HB0711 1/4" UNF 13/8 looks the same as HU0711 1/4"
UNF 1 3/8.  Am i missing something simple, or are they the same bolt?

Thanks, Sujit