Mounting bolt sizes

[benoit]

I have yet to drill holes in my chassis for mounting bolts. This wouldn't be a big problem except that I've only got 1/4-5/16" lip to work with. I wanted to use t nuts but I haven't been able to find any small enough. I have found rivet nuts that would probably do the trick but I'm not sure what I can get away with for bolts for my 100W ODS. Thoughts?

[heisthl]

Auto Zone sells "u" nuts, sometimes called speed nuts in their blister pack racks.

[benoit]

Auto Zone sells "u" nuts, sometimes called speed nuts in their blister pack racks.

Right, I've seen those at hardware stores. Those would be OK I guess, but I haven't found any that wouldn't stick way out and I want something that'd be more secure

My main concern though is how small I can go with the bolts. Like can I get away with 8-32?

[heisthl]

My main concern though is how small I can go with the bolts. Like can I get away with 8-32?

Fender Chassis straps use 8-32 bolts/nuts. Which is also another option, to use a long bolt all the way through with a nut on the bottom.

[tubedogsmith]

My main concern though is how small I can go with the bolts. Like can I get away with 8-32?

Fender Chassis straps use 8-32 bolts/nuts. Which is also another option, to use a long bolt all the way through with a nut on the bottom.

This is the best option for your chassis based on the pics you've shown.