Flathead hardware is preferred with skateboards and longboards where your feet will be on top of the bolts. This is most common with skateboards.
The best size of bolt to run with a traditional 7-ply skateboard is a length of 1″.
Note: One pack is enough for a complete skateboard (8 nuts, 8 bolts). Multiple hardware sizes available.
Sizes include:
1″
1-1/8″
1-1/4″
1-3/8″
1-1/2″
1-3/4″
2″
2-1/2″
3″