Outside US the world use M size treads. So you will find that many bolts and nuts are M6 with spanner 10mm. M6 is about 1/4 and smaller is M4, M5, bigger M8, M10. You should have tools from 8mm-19mm and you can fix almost everything
Treads on a Suzuki is standard treads, some can be fine treads but still standard.
But I like UNC and UNF, better