So I have a forklift in my small shop and one of the load wheel axles broke. So I decided to make a new axle and was wondering what type of steel I should use. Some info on the axle. It is about 5 inches long, 1 1/2 in diameter. It slides through the wheel bearings into the leg and is held on both ends by the leg plates that are about 3/4" thick. The load wheel bearings but up against the plates so all the weight is focused on the last inch of both ends. Now I could just use some mild steel round stock from the steel yard but I don't know if it's up to the task. Also a friend wanted to know if I would be up to making some for him so I want them to hold up. The forklift wieghs about 6,000lbs. And holds a load of 3500lbs. Has 4 load wheels, a drive tire and a caster wheel. Some steels I have considered are regular steel yard mild steel, A36, 1018, 4140. I would like to find the most cost effective steel since I could be making more of these.