I ended up using that roymech.co.uk website. I don't know how I missed that on my search, but it ended up being very useful in solving the problem. Thanks!
I've done a search to no avail. What I have is a bolt that is a stainless steel M4x0.7, 15mm long bolt that is inserted through an aluminum housing and bolted to a brass resonator. The portion of the bolt that is threaded into the resonator is 8.5mm long, the rest is the part going through a...