Calculating Minimum Diameter for Iron Bolt to Withstand Shear Forces

[pnl0628]

I need help getting started on this.
Question:
An iron bolt is used to connect two iron plates together. The bolt must withstand shear forces up to about 3200 N. Calculate the minimum diameter for the bolt, based on a saftey factor of 6.0.
Here is what I know so far.
Shear Strength is 170 x10^6
F/A
I don't even know where to start? Do I need a mass?

 

[Pyrrhus]

Well, what have you done?. Remember the bolt is in simple shear (it cuts in 1 plane)

 

[pnl0628]

I don't understad what you just said. I'm not good with physics at all. Can you explain that to me please.