Not sure if anyone here can help, so please suggest better sites for this question if I do have it wrong.
I have decided to build a stand from steel box section. The dimensions were in Imperial measurements. Not a problem, I thought, just use the other side of my rule, but no. I can only get a metric size.
The plan asks for 1 1/4" square box with a wall thickness of 1/82.
My steel is 30mm square, with a wall thickness of 3mm.
Now the exact metric conversion is1 1/4" = 31.75mm ,so I'm .25mm down here
1/8" = 3.175mm, again down by 0.175mm.
There is quite a wait to go on this so I am worried about the strength lost, but the next size up is just far too over the top.
Can anyone help here? Have I lost a huge amount of strength or not?
The dimension lost looks very small but when you calculate this as a strength will it become a far greater problem, I just don't know?